WO2019056204A1 - Module optique, onu, système de pon, et procédé de traitement de signal - Google Patents

Module optique, onu, système de pon, et procédé de traitement de signal Download PDF

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Publication number
WO2019056204A1
WO2019056204A1 PCT/CN2017/102441 CN2017102441W WO2019056204A1 WO 2019056204 A1 WO2019056204 A1 WO 2019056204A1 CN 2017102441 W CN2017102441 W CN 2017102441W WO 2019056204 A1 WO2019056204 A1 WO 2019056204A1
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Prior art keywords
signal
optical
reflected
onu
mirror
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PCT/CN2017/102441
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English (en)
Chinese (zh)
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杨中文
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华为技术有限公司
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Priority to PCT/CN2017/102441 priority Critical patent/WO2019056204A1/fr
Publication of WO2019056204A1 publication Critical patent/WO2019056204A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/071—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/27—Arrangements for networking
    • H04B10/272—Star-type networks or tree-type networks

Definitions

  • the present application relates to the field of optical communication technologies, and in particular, to an optical module, an ONU, a PON system, and a signal processing method.
  • PON Passive Optical Network
  • FTH Fiber To The Home
  • the Optical Time Domain Reflectometer is the main means to detect optical path performance and locate optical path failure.
  • OTDR is a photoelectric integrated instrument made by backscattering caused by Rayleigh scattering of light in an optical fiber and Fresnel reflection generated by discontinuous points in the optical fiber.
  • only the OTDR is used to detect the optical path performance and the optical path failure, and it is impossible to distinguish the multiple branch fibers of the PON network, which brings difficulties to the fault location of the branch fiber.
  • the embodiment of the present application provides an optical module, an ONU, a PON system, and a signal processing method, which can selectively reflect an optical signal to an optical fiber interface, thereby effectively improving the accuracy of optical path fault location and the efficiency of optical path performance detection.
  • a first aspect of the embodiments of the present application provides an optical module, including an optical fiber interface for receiving an optical signal, a first wavelength division multiplexing filter, and a photoelectric converter, where the first wavelength division multiplexing filter is used to a signal of a first wavelength band of the optical signal is reflected to the photoelectric converter, the optical module further comprising a second wavelength division multiplexing filter, a mirror and a reflection control device;
  • the second wavelength division multiplexing filter is configured to reflect a signal of a second wavelength band of the optical signal
  • the reflection control device is configured to control an incident angle between a reflection surface of the mirror and a signal of the second wavelength band incident on the reflection surface to control whether a signal of the second wavelength band passes through the reflection Mirror and the second wavelength division multiplexing filter are reflected to the fiber optic interface;
  • the reflection control device is configured to control optical power of a signal incident to the second wavelength band of the mirror to control whether a signal of the second wavelength band passes through the mirror and the second wavelength division A multiplexing filter is reflected to the fiber optic interface.
  • the signal of the second band may be a test signal
  • the light control module may be used to control whether the optical module reflects the test signal to the fiber interface.
  • the control device is specifically controlled by the OLT, and the ONU can send a reflection command to the ONU.
  • the ONU controls the operation of the reflection control device according to the reflection instruction, thereby controlling whether the ONU reflects the test signal. Thereby, the accuracy of the optical path fault location and the efficiency of the optical path performance detection are improved.
  • the second wavelength division multiplexing filter is located between the optical fiber interface and the first wavelength division multiplexing filter; Transmitting, by the filter, a signal outside the second band of the optical signal, and the signal outside the second band includes the signal of the first band; the first wavelength division multiplexing filter reflects the first The signal of the first band in the signal transmitted by the two wavelength division multiplexing filter.
  • the signal of the second wavelength band sequentially passes through the mirror And the second wavelength division multiplexing filter is reflected and enters the fiber interface; and the incident angle is outside the preset angle range or the optical work
  • the rate is less than or equal to the preset power value, the signal of the second band cannot be reflected to the fiber interface.
  • the reflection control device is a magnetic induction device or a piezoelectric ceramic, and the magnetic induction device or piezoelectric ceramic drives the mirror to rotate to adjust the incident angle.
  • the reflection control device is a photoelectric crystal
  • the photoelectric crystal is disposed between the second wavelength division multiplexing filter and the mirror,
  • the signal of the two-band is refracted by the photoelectric crystal and then reflected by the mirror; when the photoelectric crystal is in the first electrical state, the incident angle is within the predetermined angular range, and the photoelectric The incident angle is outside the predetermined angular range when the crystal is in the second electrical state.
  • the optoelectronic crystal can be attached to the mirror setting.
  • the surface of the optoelectronic crystal facing the mirror and the surface facing away from the mirror are not parallel, so that the angle of reflection of the light can be more flexibly controlled.
  • the first electrical state is powered off, the second electrical state is powered on, or the first electrical state is powered on, the second The electrical state is powered off. Since it is only necessary to control whether the photoelectric crystal is energized, it is possible to control whether the signal of the second wavelength band is reflected back to the optical fiber interface, which is not only simple in structure but also easy to control.
  • the reflection control device is a liquid crystal, and the signal of the second wavelength band reflected by the second wavelength division multiplexing filter and the reflective surface of the mirror The angle between the two is within a predetermined range of angles, the liquid crystal is disposed between the second wavelength division multiplexing filter and the mirror, and when the liquid crystal is in a power-off state, the liquid crystal is separated Light, such that the optical power is less than or equal to the preset power value; when the liquid crystal is in a power-on state, the liquid crystal transmits light so that the optical power is greater than the preset power value. Since it is only necessary to control whether the liquid crystal is energized, it is possible to control whether the signal of the second band is reflected back to the fiber interface, which is not only simple in structure but also easy to control.
  • the second aspect of the present application provides an optical network unit ONU, including the optical module according to any of the above aspects.
  • the ONU further includes a processor and a driving circuit, where the driving circuit is respectively connected to the processor and the reflection control device;
  • the processor receives a reflection instruction sent by the optical line terminal OLT, and sends a control signal to the driving circuit according to the reflection instruction;
  • the driving circuit controls an operating state of the reflection control device according to the control signal to control whether a signal of the second wavelength band is reflected to the optical fiber interface.
  • the signal of the second band may be a test signal, and the light control module may be used to control whether the optical module reflects the test signal to the fiber interface.
  • the control device is specifically controlled by the OLT, and the ONU can send a control command to the ONU.
  • the ONU controls the operation of the reflective control device according to the control command, thereby controlling whether the ONU reflects the test signal.
  • the remote control of the ONU by the OLT can be realized, thereby improving the accuracy of optical path fault location and the efficiency and convenience of optical path performance detection.
  • the signal of the second wavelength band is multiplexed via the mirror and the second wavelength division.
  • the filter is reflected to the optical fiber interface;
  • the working state of the reflective control device is a power-on state, the signal of the second wavelength band cannot be reflected to the optical fiber interface;
  • the operating state of the reflection control device when the operating state of the reflection control device is the power-on state, the signal of the second wavelength band is reflected to the optical fiber interface via the mirror and the second wavelength division multiplexing filter; When the operating state of the reflection control device is the power-down state, the signal of the second band cannot be reflected to the fiber interface.
  • the ONU further includes a counter, where the counter is respectively connected to the processor and the driving circuit;
  • the counter starts counting when the driving circuit controls an operating state of the reflection control device such that a signal of the second wavelength band cannot be reflected to the fiber optic interface;
  • the processor sends a clear signal to the counter every preset time interval; the counter clears the count result of the counter according to the clear signal;
  • the counter sends a reflected signal to the driving circuit when the counting result is not cleared by the processor such that the counting state is full;
  • the driving circuit controls an operating state of the reflection control device according to the reflected signal to control a signal of the second wavelength band to be reflected by the mirror and the second wavelength division multiplexing filter in sequence The fiber interface.
  • the ONU can spontaneously control the signal of the second band to be reflected to the fiber interface when the card is stuck, so that the signal of the second band is reflected back to the management side, and the fault information is reported to the OLT, so that the fault can be reported spontaneously. Information to improve the efficiency and accuracy of optical path fault location.
  • a third aspect of the present application provides a passive optical network PON system, including the ONU according to any one of the foregoing second aspects.
  • the PON system further includes an OLT, an optical time domain reflectometer OTDR;
  • the OLT sends a reflection instruction to the ONU
  • the ONU controls an operating state of the reflection control device according to the reflection instruction
  • the OLT sends a test command to the OTDR; the OTDR sends a test optical signal to the ONU according to the test command, where the test optical signal is a signal of the second band;
  • the ONU uses the reflection control device to control whether the test optical signal is reflected to the fiber optic interface via the mirror and the second wavelength division multiplexing filter to reflect the test light signal back to the The OTDR, or, does not reflect the test optical signal back to the OTDR.
  • the OLT can control the ONU to reflect the test optical signal sent by the OTDR back to the OTDR or not back to the OTDR by controlling the working state of the reflection control device included in the ONU, so that the OLT can be targeted. Detecting the optical path performance of a certain or some branch fiber, corresponding to the reflection peak of the test light signal reflected by the branch fiber or the branch fiber, effectively avoiding the occurrence of dense reflection peaks, thereby accurately determining the E2E of the single branch. Loss and the ability to accurately locate faults in the branch fiber.
  • a fourth aspect of the present application provides a signal processing method, which is applied to an ONU, where the ONU includes an optical module, and the method includes: the ONU receives a reflection instruction sent by the OLT, and receives an optical time domain reflectometer OTDR.
  • the test optical signal is sent, and the working state of the optical module is controlled according to the reflective command to control the optical module to reflect the test optical signal back to the OTDR, or the optical module is controlled to not reflect the test optical signal back to the OTDR.
  • the ONU can selectively reflect the test optical signal back to the OTDR under the control of the OLT, or can not reflect the test optical signal back to the OTDR, thereby specifically detecting the optical path performance of a certain or some branch fiber. Improve the detection efficiency of optical path performance and improve the accuracy of optical path fault location.
  • the ONU further includes a counter, where the counter is connected to the optical module, and the counter starts counting when the ONU controls the optical module to not reflect the test optical signal back to the OTDR.
  • the counter count result is cleared to zero by a preset time interval. If the counting result of the counter is not cleared by the ONU, the counting state of the counter is full, that is, the ONU is stuck and the counting result of the counter is not cleared in time, so that the counting state of the counter is When the timer is full, the optical module is reflected by the counter to reflect the test light signal back to the OTDR.
  • the ONU can reflect the test optical signal back to the OTDR in the case of a stuck condition, so that the fault information is reported to the OLT, so that the ONU can report the fault information spontaneously, and improve the efficiency and accuracy of the optical path fault location.
  • a fifth aspect of the embodiments of the present application provides a computer readable storage medium, where the computer storage medium stores a computer program, where the computer program includes program instructions, and when the program instructions are executed by the computer, cause the computer to execute any one of the fourth aspects described above. Ways.
  • a sixth aspect of the embodiments of the present application provides a computer program product, the computer program product comprising program instructions, which, when executed by a computer, cause the computer to perform any one of the methods described in the fourth aspect.
  • FIG. 1 is a schematic structural diagram of a PON system according to an embodiment of the present application.
  • FIG. 2 is a schematic diagram of a scenario for detecting a branch fiber fault of a PON network according to an embodiment of the present application
  • FIG. 3(a) is a schematic structural diagram of an optical module according to an embodiment of the present application.
  • FIG. 3(b) is a schematic structural diagram of another optical module according to an embodiment of the present disclosure.
  • FIG. 4(a) is a schematic structural diagram of still another optical module according to an embodiment of the present application.
  • FIG. 4(b) is a schematic structural diagram of still another optical module according to an embodiment of the present application.
  • FIG. 4(c) is a schematic structural diagram of still another optical module according to an embodiment of the present disclosure.
  • FIG. 4(d) is a schematic structural diagram of still another optical module according to an embodiment of the present application.
  • FIG. 5(a) is a schematic structural diagram of still another optical module according to an embodiment of the present disclosure.
  • FIG. 5(b) is a schematic structural diagram of still another optical module according to an embodiment of the present disclosure.
  • FIG. 5(c) is a schematic structural diagram of still another optical module according to an embodiment of the present application.
  • FIG. 5(d) is a schematic structural diagram of still another optical module according to an embodiment of the present disclosure.
  • FIG. 6(a) is a schematic structural diagram of still another optical module according to an embodiment of the present disclosure.
  • FIG. 6(b) is a schematic structural diagram of still another optical module according to an embodiment of the present application.
  • FIG. 6(c) is a schematic structural diagram of still another optical module according to an embodiment of the present disclosure.
  • FIG. 6(d) is a schematic structural diagram of still another optical module according to an embodiment of the present application.
  • FIG. 7(a) is a schematic structural diagram of still another optical module according to an embodiment of the present disclosure.
  • FIG. 7(b) is a schematic structural diagram of still another optical module according to an embodiment of the present application.
  • FIG. 7(c) is a schematic structural diagram of still another optical module according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic structural diagram of an ONU according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic flowchart diagram of a signal processing method according to an embodiment of the present application.
  • FIG. 1 is a schematic structural diagram of a PON system according to an embodiment of the present disclosure.
  • the PON system includes an Optical Line Terminal (OLT) 101, an optical time domain reflectometer OTDR 102, and light.
  • An optical network unit (ONU) 103 the PON system further includes an optical distribution network (ODN) 104 and a wavelength division multiplexing (WDM) device 105.
  • the OTDR 102 may be disposed inside the OLT 101 or may exist independently of the OLT 101.
  • the OLT 101, the OTDR 102, and the WDM 105 are installed in a central control station of the PON network.
  • the ONU 103 is installed in a user location of the PON system, and is disposed at the end of the branch fiber.
  • the ONU 103 and the user equipment may also have other networks such as Ethernet.
  • the ODN 104 includes an optical splitter (Splitter) 1041, a trunk optical fiber 1042, and a branch optical fiber 1043.
  • the OLT 101 and the optical splitter 1041 are connected by a trunk optical fiber 1042, and the optical splitter 1041 can realize point-to-multipoint optical power distribution.
  • the plurality of ONUs 103 are connected by a plurality of branch fibers 1043.
  • the OTDR 102 is configured to transmit a test optical signal to a plurality of ONUs 103 in the PON system.
  • the wavelength of the test optical signal is different from the service wavelength in the PON system.
  • the test optical signal can be uploaded to the trunk optical fiber 1042 of the ODM 104 through the WDM device 105, and passed through the ODM 104.
  • the test optical signals are distributed to the respective branch fibers 1043, and the test optical signals can be used to detect the optical path performance of the branch fibers 1043 connected to the respective ONUs 103, and to locate the optical path failure of the branch fibers 1043.
  • the passiveness of the PON network means that the optical distribution network does not contain any electronic devices and electronic power sources, and the ODNs are all composed of passive components such as optical splitters, and do not require expensive active electronic devices.
  • the number and form of the OLT, the OTDR, and the ONU shown in FIG. 1 are not limited to the embodiments of the present application. In practical applications, the PON system may include multiple OLTs, OTDRs, and ONUs.
  • FIG. 2 is a schematic diagram of a scenario for detecting a branch fiber fault of a PON network according to an embodiment of the present application.
  • a fiber Bragg grating is respectively disposed in front of each branch fiber of the PON network, and a fiber Bragg grating (FBG) is respectively disposed before the ONU corresponding to each branch fiber, so that the PON can be used to select the wavelength reflection characteristic of the FBG.
  • Network branch fiber for performance and fault detection.
  • the FBG can totally reflect the test optical signal emitted by the OTDR, and then reflect the test optical signal back to the OTDR.
  • the wavelength of the test optical signal can be, for example, 1650 nm; the FBG can allow the service optical signal to pass, thereby allowing the service optical signal to reach the ONU, thereby avoiding The normal operation of the PON network is affected.
  • the wavelength of the service optical signal can be, for example, 1490 nm.
  • the OLT when it is required to detect the performance or fault of the PON network branch fiber, the OLT sends a test command to the OTDR, and after receiving the test command sent by the OLT, the OTDR uploads the test optical signal to the trunk optical fiber of the ODM through the WDM device, and then The test optical signal is distributed to each branch fiber through the ODM, and the FBG disposed at the end of each branch fiber reflects the test light signal back to the OTDR. The OTDR receives the test light signal reflected back by the FBG on each branch fiber and forms a reflection peak.
  • the test optical signals reflected by the FBGs on different branch fibers correspond to different reflection peaks, and the OLT can calculate the end to end (E2E) loss of each branch fiber by using the reflection peaks corresponding to the respective branch fibers. Detect the performance of each branch fiber. Further, by monitoring the changes of the respective reflection peaks, To monitor the status of each branch fiber. For example, if an optical path fault occurs in each branch fiber, when the OTDR sends a test optical signal to each branch fiber, if the branch fiber path is normal, the OTDR will receive the test light signal reflected by the FBG on the branch fiber with normal optical path, and form a reflection.
  • E2E end to end
  • the OTDR will not receive the test light signal reflected by the FBG on the branch fiber with the optical path failure, and will not form a reflection peak. Therefore, if monitoring the change of each reflection peak, if there is a reflection If the peak suddenly disappears, or the amplitude is greatly reduced, it is determined that the corresponding branch fiber has an optical path failure, so that the network branch fiber of the PON can be fault-located.
  • each branch fiber can be monitored by setting the FBG at the end of each branch fiber of the PON network, but the length of the branch fiber in the PON network is uncontrollable, that is, between the branch fibers.
  • the lengths may differ slightly or they may vary greatly. For the case where the lengths of the branch fibers are large, the test light signals reflected by the FBG on the branch fiber back to the OTDR will form sparse reflection peaks.
  • the OTDR can accurately determine the corresponding reflection peaks of the respective branch fibers;
  • the test optical signal reflected by the FBG on the branch fiber back to the OTDR forms a dense reflection peak, which makes it difficult for the OTDR to determine the corresponding reflection peaks of the respective branch fibers, so that it is difficult to determine the E2E loss of a single branch. Further, it is difficult to locate the fault of the branch fiber.
  • the above problems are quite obvious for the case where the length of the branched fiber is equal.
  • the embodiment of the present application first provides an optical module.
  • FIG. 3(a) and FIG. 3(b) FIG. 3(a) or FIG. 3(b) is provided in the embodiment of the present application.
  • the optical module provided by the embodiment of the present application includes a fiber optic interface 301, a first wavelength division multiplexing filter 302, a photoelectric converter 303, and a second wavelength division multiplexing filter.
  • the sheet 304, the mirror 305, the reflection control device 306 and the electro-optic converter 307 wherein, as shown in FIG. 3(a), the mirror 305 may be located between the second wavelength division multiplexing filter 304 and the reflection control device 306. As shown in FIG. 3(b), the reflection control device 306 may also be located between the second wavelength division multiplexing filter 304 and the mirror 305.
  • the optical fiber interface 301 is configured to receive the optical signal L transmitted on the branch fiber; the first wavelength division multiplexing filter 302 is configured to reflect the signal L1 of the first band in the optical signal L to the photoelectric converter 303.
  • the signal L1 of the first band can be reflected at the D1 position on the first wavelength division multiplexing filter 302 and reflected to the photoelectric converter 303; the photoelectric converter 303 is used to convert the signal L1 of the first band into an electrical signal.
  • the second wavelength division multiplexing filter 304 is configured to reflect the signal L2 of the second band in the optical signal, and the signal L2 of the second band may be reflected at the D2 position on the second wavelength division multiplexing filter 304; the reflection control The device 306 is configured to control an incident angle between the reflective surface of the mirror 305 and the signal L2 of the second wavelength band incident on the reflective surface to control whether the signal L2 of the second wavelength band is multiplexed via the mirror 305 and the second wavelength division.
  • the filter 304 is reflected to the fiber interface 301; or the reflection control device 306 is used to control the optical power of the signal L2 incident to the second band of the mirror 305 to control whether the signal L2 of the second band passes through the mirror 305 and the second Wavelength division multiplexing filter Reflective interface 301 to the optical fiber 304; 307 electro-optical converter for converting electrical signals into optical signals, wherein the electro-optical converter 307, for example, may be a laser. It should be noted that the orientation of the optical signals in FIG. 3(a) and FIG. 3(b) and the positional relationship between the respective devices are only illustrative and are not intended to limit the embodiments of the present application.
  • the signal of the second band may be a test signal
  • the reflection control device 306 may be used to control whether the optical module reflects the test signal to the fiber interface 301. How to specifically control the reflection control device 306 can be performed by the OLT to the ONU
  • the control command is sent, and the ONU controls the operation of the reflection control device 306 according to the control command, thereby controlling whether the ONU reflects the test signal.
  • the remote control of the ONU by the OLT can be realized, thereby improving the accuracy of optical path fault location and the efficiency and convenience of optical path performance detection.
  • the second wavelength division multiplexing filter 304 is located between the optical fiber interface 301 and the first wavelength division multiplexing filter 302.
  • the first wavelength division multiplexing filter 302 may be, for example, a 1490/1310 nm wavelength division multiplexing filter
  • the second wavelength division multiplexing filter 304 may be, for example, a 1650 nm wavelength division multiplexing filter; and a second wavelength division multiplexing filter.
  • 304 transmits a signal other than the second band in the optical signal L, that is, the signal L3 in FIG. 3(a) or FIG. 3(b), and the signal L3 outside the second band includes the signal L1 in the first band.
  • the first wavelength division multiplexing filter 301 reflects the signal L1 of the first band in the signal L3 transmitted by the second wavelength division multiplexing filter 304 to the photoelectric converter 303; the photoelectric converter 303 signals the first band The L1 is converted into an electrical signal; the electro-optic converter 307 generates an optical signal L4 that transmits the first wavelength division multiplexing filter 302 and the second wavelength division multiplexing filter 304 to the optical fiber interface 301 in succession.
  • the first wavelength division multiplexing filter 302 may be located between the optical fiber interface 301 and the second wavelength division multiplexing filter 304, and the first wavelength division multiplexing The filter 302 transmits a signal outside the first band of the optical signal L, the signal outside the first band includes the signal L2 of the second band; and the second wavelength division multiplexing filter 304 reflects the first wavelength division multiplexing filter The signal L2 of the second band of the signals transmitted by the slice 302.
  • the reflection control device 306 controls the incident angle between the reflective surface of the mirror 305 and the signal L2 of the second wavelength band incident on the reflective surface to be within a preset angle range, or when the reflection When the control device 306 controls the optical power of the signal L2 of the second wavelength band incident on the mirror 305 to be greater than the preset power value, the signal of the second wavelength band is sequentially reflected by the mirror 305 and the second wavelength division multiplexing filter 304 to enter Fiber optic interface 301.
  • the reflection control device 306 controls the incident angle between the reflective surface of the mirror 305 and the signal L2 of the second wavelength band incident on the reflective surface to be outside the preset angle range, or when the reflection control device 306 controls the incident to the mirror
  • the optical power of the signal L2 of the second band of 305 is less than or equal to the preset power value
  • the signal L2 of the second band cannot be reflected to the fiber interface 301.
  • the signal L2 of the second band cannot be reflected by the mirror 305 and the second wavelength division multiplexing filter 304 and enters the fiber interface 301.
  • the signal L2 of the second wavelength band is incident on the reflection surface of the mirror 305 at the first incident angle, after being reflected by the mirror 305, it can reach the second wavelength division multiplexing filter 304 and pass the second wavelength division multiplexing filter.
  • the optical fiber interface 301 can be reached, and the first incident angle is within a preset angle range; if the signal L2 of the second wavelength band is incident on the reflective surface of the mirror 305 at the second incident angle, and reflected by the mirror 305
  • the second wavelength division multiplexing filter 304 is not reached, or the signal L2 of the second wavelength band is reflected by the mirror 305 and then deviated from the second wavelength division multiplexing filter 304, or the signal of the second wavelength band L2 is reflected.
  • the mirror 305 After the mirror 305 is reflected, it reaches the second wavelength division multiplexing filter 304, but after being reflected by the second wavelength division multiplexing filter 304 and off the fiber interface 301, the second incident angle is outside the preset angle range.
  • the reflection control device 306 is a magnetic induction device 3061 or a piezoelectric ceramic 3062
  • the mirror 305 is disposed between the second wavelength division multiplexing filter 304 and the magnetic induction device 3061, or is located at the Between the two wavelength division multiplexing filter 304 and the piezoelectric ceramic 3062.
  • the magnetic induction device 3061 or the piezoelectric ceramic 3062 can drive the mirror 305 to rotate to adjust the incident angle between the reflecting surface of the mirror 305 and the signal L2 of the second wavelength band incident on the reflecting surface, thereby controlling the signal of the second wavelength band. Whether L2 is reflected to the fiber optic interface 301 via the mirror 305 and the second wavelength division multiplexing filter 304.
  • the reflection control device 306 when the reflection control device 306 is the magnetic induction device 3061, the non-reflecting surface of the mirror is plated with a metal material, and the magnetic sensing device 3061 (for example, a magnetic coil) can drive the mirror 305 to rotate by generating a magnetic force, which can control the generated magnetic force.
  • the size is to attract the mirror 305 to rotate at different angles.
  • the reflection control device 306 is a pressure ceramic 3062
  • the pressure ceramic 3062 can utilize its own telescopic performance to drive the mirror 305 to rotate, and can drive the mirror 305 to rotate at different angles by controlling the amplitude of its own expansion and contraction.
  • the magnetic induction device 3061 controls the angle between the mirror 305 and the second wavelength division multiplexing filter 304 to control the reflection surface of the mirror 305 and the incident surface to the reflection surface.
  • the angle of incidence between the two-band signal L2 is within a predetermined range of angles.
  • the angle between the magnetic sensing device 3061 driving the mirror 305 and the second wavelength division multiplexing filter 304 is a first angle, and the reflecting surface of the mirror 305 and the incident surface are incident on the reflecting surface.
  • the incident angle between the two-band signal L2 is 0 degrees and is within a preset angle range.
  • the signal L2 of the second band is reflected at the position D3 on the reflecting surface of the mirror 305, and then returns to the original path.
  • the second wavelength division multiplexing filter 304 reflects the signal L2 of the second band to the fiber interface 301.
  • the signal L2 reflected to the second band of the fiber interface 301 via the mirror 305 and the second wavelength division multiplexing filter 304 is opposite to the optical path of the optical signal L received by the fiber interface 301, and is reflected to the fiber interface 301.
  • the signal L2 of the second band is transmitted on the branch fiber outside the optical module, it returns along the original path, and the light attenuation is small.
  • the angle between the magnetic sensing device 3061 driving the mirror 305 and the second wavelength division multiplexing filter 304 is a second angle, and the reflecting surface of the mirror 305 is incident on the reflecting surface.
  • the incident angle between the signal L2 of the second wavelength band is ⁇ A, and is within a preset angle range.
  • the signal L2 of the second wavelength band is reflected at the position D3 of the reflecting surface of the mirror 305, and then reflected to the second
  • the second wavelength division multiplexing filter 304 reflects the signal L2 of the second band to the fiber interface 301.
  • the signal L2 of the second band reflected to the fiber interface 301 via the mirror 305 and the second wavelength division multiplexing filter 304 is not opposite to the optical path of the optical signal L received by the fiber interface 301, and is reflected to the fiber interface 301.
  • the signal L2 of the second band is transmitted on the branch fiber outside the optical module, multiple reflections occur on the branch fiber, and the light attenuation is large.
  • the magnetic induction device 3061 controls the angle between the mirror 305 and the second wavelength division multiplexing filter 304 to control the reflection surface of the mirror 305 and the incident surface to the reflection surface.
  • the angle of incidence between the two-band signal L2 is outside the preset angle range.
  • the angle between the magnetic sensing device 3061 driving the mirror 305 and the second wavelength division multiplexing filter 304 is a third angle, and the reflecting surface of the mirror 305 and the incident surface are incident.
  • the incident angle between the two-band signal L2 is ⁇ B and is outside the preset angle range.
  • the signal L2 of the second band is reflected at the D3 position on the reflecting surface of the mirror 305, and then reflected to the second wave.
  • the D5 position of the multiplex filter 304 is divided, and the signal L2 of the second band is reflected by the second wavelength division multiplexing filter 304 and then deviated from the fiber interface 301.
  • the angle between the magnetic induction device 3061 driving the mirror 305 and the second wavelength division multiplexing filter 304 is a fourth angle, and the reflecting surface of the mirror 305 is incident on the reflecting surface.
  • the incident angle between the signal L2 of the second band is ⁇ C and is outside the preset angle range.
  • the signal L2 of the second band is reflected at the D3 position on the reflecting surface of the mirror 305, and is not reflected.
  • the signal L2 of the second wavelength band is reflected at the position D3 of the reflecting surface of the mirror 305, and then deviated from the second wavelength division multiplexing filter 304, and further the second wavelength band.
  • the signal L2 cannot be reflected to the fiber interface 301.
  • the first electrical state is powered off, and the second electrical state is powered.
  • the first electrical state is powered-on and the second electrical state is powered down.
  • the piezoelectric ceramic 3062 controls the angle between the mirror 305 and the second wavelength division multiplexing filter 304 to control the reflection surface of the mirror 305 and the incident surface.
  • the incident angle between the signals L2 of the second wavelength band is within a predetermined angular range, and the signal L2 of the second wavelength band is reflected to the optical fiber interface 301 via the mirror 305 and the second wavelength division multiplexing filter 304.
  • the optical path of the signal L2 of the second band is as shown in FIG. 5(a) or 5(b), and may be referred to the foregoing description, and details are not described herein again.
  • the piezoelectric ceramic 3062 When the piezoelectric ceramic 3062 is switched to the second electrical state, the piezoelectric ceramic 3062 controls the angle between the mirror 305 and the second wavelength division multiplexing filter 304 to control the reflection surface of the mirror 305 and the incident surface.
  • the incident angle between the signals L2 of the second band is outside the preset angle range, and the signal L2 of the second band cannot be reflected to the fiber interface 301.
  • the optical path of the signal L2 of the second band is as shown in FIG. 5(c) or 5(d), and may be referred to the foregoing description, and details are not described herein again.
  • the reflection surface of the mirror 305 is incident on the reflection surface.
  • the incident angle between the signals L2 of the second wavelength band is a third angle and is located within a preset range, and the third angle is greater than ⁇ A is smaller than ⁇ B, and the signal L2 of the second wavelength band is reflected by the mirror 305, and can be reflected to
  • the second wavelength division multiplexing filter 304, and the second wavelength division multiplexing filter can reflect the signal L2 of the second band to the fiber interface 301.
  • the signal L2 of the second band can be reflected to the fiber interface 301 via the mirror 305 and the second wavelength division multiplexing filter 304, but when the signal L2 of the second band is transmitted on the branch fiber outside the optical module,
  • the light attenuation is large, and it is difficult to meet the light attenuation requirement of the optical signal transmitted on the branch fiber, so that the third angle can also be determined to be outside the preset angle range.
  • the preset angle range may be between 0 degrees and 3 degrees to ensure that the signal L2 reflected to the second wavelength band of the fiber interface 301 via the mirror 305 and the second wavelength division multiplexing filter 304 is outside the optical module. There is less light attenuation when transmitting on branch fibers.
  • the reflection control device 306 is a photoelectric crystal 3063, and the photoelectric crystal 3063 is set in the second wave division. Between the filter 304 and the mirror 305. The signal L2 of the second wavelength band is first reflected by the second wavelength division multiplexing filter 304, then refracted by the photoelectric crystal 3063, and is emitted to the mirror 305, which is then reflected by the mirror 305. Photoelectric crystal 3063 can be placed in contact with mirror 305.
  • the surface of the photo-crystal 3063 facing the mirror 305 and the surface facing away from the mirror 305 are not parallel, so that the angle of reflection of the light can be more flexibly controlled.
  • the incident angle between the reflecting surface of the mirror 305 and the signal L2 of the second wavelength band incident on the reflecting surface is within a preset angle range, and the signal L2 of the second wavelength band It is reflected by the mirror 305 in turn, the photoelectric crystal 3063 is refracted, and the second wavelength division multiplexing filter 304 is reflected and enters the fiber interface 301.
  • the incident angle between the reflecting surface of the mirror 305 and the signal L2 of the second wavelength band incident on the reflecting surface is outside the preset angle range, and the signal L2 of the second wavelength band cannot be Reflected to fiber optic interface 301.
  • the first electrical state is power-off, and the second electrical state is power-on; or the first electrical state is powered-on, and the second electrical state is powered-off. Since it is only necessary to control whether the photoelectric crystal 3063 is energized, it is possible to control whether the signal of the second wavelength band is reflected back to the optical fiber interface, which is not only simple in structure but also easy to control.
  • the refractive index of the photoelectric crystal 3063 is the first refractive index
  • the signal L2 of the second wavelength band is refracted by the photoelectric crystal 3063 and then exits to the mirror 305, and the reflecting surface of the mirror 305 is incident to
  • the incident angle between the signals L2 of the second wavelength band of the reflecting surface is within a predetermined angle range.
  • the signal L2 of the second wavelength band is reflected by the second wavelength division multiplexing filter 304, and then reflected to the M1 position of the photoelectric crystal 3063, and is refracted by the photoelectric crystal 3063 and then emitted to the reflecting surface of the mirror 305.
  • the upper D3 position, the reflecting surface of the mirror 305 and the second incident to the reflecting surface The incident angle between the signal L2 of the band is 0 degree, and the signal L2 of the second band is reflected by the mirror 305, returns to the M1 position of the photoelectric crystal 3063 along the original path, and is refracted by the photoelectric crystal 3063 and then returned to the original path.
  • the second wavelength division multiplexing filter 304 reflects the signal L2 of the second wavelength band back to the optical fiber interface 301 along the original path.
  • the signal L2 of the second wavelength band is reflected by the second wavelength division multiplexing filter 304, and then reflected to the M1 position of the photoelectric crystal 3063, and is refracted by the photoelectric crystal 3063 and then emitted to the mirror 305.
  • the D4 position on the reflecting surface, the incident angle between the reflecting surface of the mirror 305 and the signal L2 of the second wavelength band incident on the reflecting surface is ⁇ D, and is within a preset angle range, and the signal L2 of the second wavelength band is After being reflected by the mirror 305, it is reflected to the M2 position of the photoelectric crystal 3063, and then refracted by the photoelectric crystal 3063, and then emitted to the D5 position of the second wavelength division multiplexing filter 304, and the second wavelength division multiplexing filter 304 is second.
  • the band signal L2 is reflected back to the fiber interface 301.
  • the refractive index of the photoelectric crystal 3063 is the second refractive index
  • the signal L2 of the second wavelength band is refracted by the photoelectric crystal 3063 and then emitted to the mirror 305.
  • the reflecting surface of the mirror 305 is incident to the mirror 305.
  • the incident angle between the signals L2 of the second wavelength band of the reflecting surface is outside the preset angular range.
  • the signal L2 of the second wavelength band is reflected by the second wavelength division multiplexing filter 304, and then reflected to the M1 position of the photoelectric crystal 3063, and is refracted by the photoelectric crystal 3063 and then emitted to the reflecting surface of the mirror 305.
  • the upper D6 position, the incident angle between the reflecting surface of the mirror 305 and the signal L2 of the second wavelength band incident on the reflecting surface is ⁇ E, and is outside the preset angle range, and the signal L2 of the second wavelength band is reflected
  • ⁇ E the incident angle between the reflecting surface of the mirror 305 and the signal L2 of the second wavelength band incident on the reflecting surface
  • the signal L2 of the second wavelength band is reflected by the second wavelength division multiplexing filter 304, and then reflected to the M1 position of the photoelectric crystal 3063, refracted by the photoelectric crystal 3063, and then emitted to the mirror 305.
  • the D8 position on the reflecting surface, the incident angle between the reflecting surface of the mirror 305 and the signal L2 of the second wavelength band incident on the reflecting surface is ⁇ F, and is outside the preset angle range, and the signal L2 of the second wavelength band
  • the mirror 305 After being reflected by the mirror 305, it is reflected to the M4 position of the photo-crystal 3063, and after being refracted by the photo-crystal 3063, it cannot be emitted to the second wavelength division multiplexing filter 304, so that the signal L2 of the second band cannot pass through the mirror 305.
  • the reflection, the photoelectric crystal 3063 is refracted and the second wavelength division multiplexing filter 304 is reflected and then enters the fiber interface 301 to be reflected to the fiber interface 301.
  • the reflection control device 306 is a liquid crystal 3064, and a second wavelength division multiplexing filter is preset.
  • the position of the liquid crystal 3064 and the mirror 305 is such that the angle between the signal L2 of the second wavelength band reflected by the second wavelength division multiplexing filter 304 and the reflection surface of the mirror 305 is within a preset angle range, wherein The liquid crystal 3064 is disposed between the second wavelength division multiplexing filter 304 and the mirror 305.
  • the liquid crystal 3064 When the liquid crystal 3064 is in the power-down state, the liquid crystal 3064 is shielded from light. As shown in FIG. 7(a), the liquid crystal 3064 controls the optical power of the signal L2 incident to the second wavelength band of the liquid crystal 3064 to be lower than or equal to a preset power value to control the signal L2 of the second wavelength band not to transmit the liquid crystal 3064 to the reflection.
  • the signal L2 on the reflecting surface of the mirror 305, thereby controlling the second wavelength band cannot be reflected to the fiber optic interface 301. Since it is only necessary to control whether the liquid crystal 3064 is energized, it is possible to control whether the signal of the second band is reflected back to the fiber interface, which is not only simple in structure but also easy to control.
  • the liquid crystal 3064 When the liquid crystal 3064 is in the power-on state, the liquid crystal 3064 transmits light.
  • the liquid crystal 3064 can control the optical power of the signal L2 incident to the second wavelength band of the liquid crystal 3064 to remain greater than a preset power value to control the signal L2 of the second wavelength band to transmit the liquid crystal 3064 to the reflective surface of the mirror 305.
  • the signal L2 of the second band is filtered by the second wavelength division multiplexing. After the wave plate 304 is reflected, it is reflected to the liquid crystal 3064, and transmits the liquid crystal 3064 to the position D3 on the reflecting surface of the mirror 305, and the incident angle between the reflecting surface of the reflecting mirror 305 and the signal L2 of the second wavelength band incident on the reflecting surface.
  • the signal L2 of the second wavelength band is reflected by the mirror 305, returns to the liquid crystal 3064 along the original path, and the transparent liquid crystal 3064 returns along the original path to the D2 position of the second wavelength division multiplexing filter 304, the second wave.
  • the sub-multiplex filter 304 reflects the signal L2 of the second band back to the fiber interface 301 along the original path.
  • the signal L2 of the second wavelength band is reflected by the second wavelength division multiplexing filter 304, and then reflected to the liquid crystal 3064, and transmits the liquid crystal 3064 to the position D4 on the reflecting surface of the mirror 305.
  • the incident angle between the reflecting surface of the mirror 305 and the signal L2 of the second wavelength band incident on the reflecting surface is ⁇ G, and is within a preset angle range, and the signal L2 of the second wavelength band is reflected by the mirror 305 and transmitted. From the liquid crystal 3064 to the D5 position of the second wavelength division multiplexing filter 304, the second wavelength division multiplexing filter 304 reflects the signal L2 of the second wavelength band back to the fiber interface 301.
  • the liquid crystal 3064 controls the optical power of the signal L2 of the second wavelength band incident on the liquid crystal 3064 to be lower than the preset power value to control the signal L2 of the second wavelength band not to transmit the liquid crystal 3064 to the mirror.
  • the liquid crystal 3064 can control the optical power of the signal L2 of the second wavelength band incident on the liquid crystal 3064 to be greater than or equal to a preset power value to control the reflection of the liquid crystal 3064 of the second wavelength band to the reflection of the mirror 305.
  • FIG. 8 is a schematic structural diagram of an ONU according to an embodiment of the present application.
  • the ONU provided by the embodiment of the present application includes an optical module 801, a processor 802, and a driving circuit 803.
  • the optical module 801 may be any optical module as described above, and FIG. 8 is merely exemplified by the optical module shown in FIG. 3( a ).
  • the drive circuit 803 is connected to the processor 802 and the reflection control device 8016 included in the optical module 801, respectively.
  • the processor 802 receives the reflection instruction sent by the OLT, and sends a control signal to the driving circuit 803 according to the reflection instruction; the driving circuit 803 controls the working state of the reflection control device 8016 according to the control signal to control whether the signal L2 of the second wavelength band is reflected to Fiber optic interface 8013.
  • the reflection control device 8016 is a magnetic induction device or a piezoelectric ceramic.
  • the driving circuit 803 switches the operating state of the reflection control device 8016 to the first electrical state according to the control signal
  • the reflection control device 8016 controls the reflection.
  • the angle between the mirror 8015 and the second wavelength division multiplexing filter 8014 is such that the incident angle between the reflection surface of the mirror 8015 and the signal L2 of the second wavelength band incident on the reflection surface is within a preset angle range.
  • the signal L2 of the second band is reflected to the fiber interface 8011 via the mirror 8015 and the second wavelength division multiplexing filter 8014.
  • the reflection control device 8016 controls the angle between the mirror 8015 and the second wavelength division multiplexing filter 8014 to control the reflection.
  • the incident angle between the reflecting surface of the mirror 8015 and the signal L2 of the second wavelength band incident on the reflecting surface is outside the predetermined angular range, and the signal L2 of the second wavelength band cannot be reflected to the optical fiber interface 8011.
  • the reflection control device 8016 is a photoelectric crystal.
  • the refractive index of the photoelectric crystal is the first refractive index
  • the photoelectric crystal control mirror The incident angle between the reflecting surface of 8015 and the signal L2 of the second wavelength band incident on the reflecting surface is within a predetermined angle range, and the signal L2 of the second wavelength band is reflected to the second wavelength division multiplexing filter 8014 via the mirror 8015.
  • Fiber optic interface 8011 is a photoelectric crystal.
  • the driving circuit 803 controls the photocrystal to be in the second electrical state according to the control signal
  • the refractive index of the photonic crystal For the second refractive index, the incident angle between the reflective surface of the photoelectric crystal control mirror 8015 and the signal L2 of the second wavelength band incident to the reflective surface is outside the preset angle range, and the signal L2 of the second wavelength band cannot be reflected to the optical fiber.
  • Interface 8011 the refractive index of the photonic crystal
  • the reflection control device 8016 is a liquid crystal.
  • the driving circuit 803 controls the liquid crystal to be in a power-off state according to the control signal, the liquid crystal is shielded, and the liquid crystal controls the optical power of the signal L2 incident to the second wavelength band of the liquid crystal.
  • the signal L2 is controlled to be lower than or equal to the preset power value to control the second band of the signal to transmit the liquid crystal to the reflective surface of the mirror 801, so that the signal L2 of the second band is not reflected to the fiber interface 8011.
  • the liquid crystal When the driving circuit 803 controls the liquid crystal to be in a power-on state according to the control signal, the liquid crystal transmits light, and the liquid crystal controls the optical power of the signal L2 of the second wavelength band incident on the liquid crystal to be greater than a preset power value to control the signal L2 of the second wavelength band.
  • the liquid crystal is transmitted to the reflecting surface of the mirror 8015, thereby controlling the signal L2 of the second wavelength band to be reflected to the optical fiber interface 8011 via the mirror 8015 and the second wavelength division multiplexing filter 8014.
  • the first electrical state is powered off, and the second electrical state is powered.
  • the first electrical state is powered-on and the second electrical state is powered down.
  • the specific implementation manner of the reflection control device 8016 for controlling whether the signal L2 of the second band is reflected to the fiber interface 8011 via the mirror 8015 and the second wavelength division multiplexing filter 8014 in different working states may be referred to the foregoing description. , will not repeat them here.
  • the ONU provided by the embodiment of the present application further includes a counter 804, and the counter 804 is respectively connected to the processor 802 and the driving circuit 803.
  • the counter 804 starts counting when the driving circuit 803 controls the signal of the second band not to be reflected to the fiber interface 8011 via the mirror 8015 and the second wavelength division multiplexing filter; the processor 802 sends the flag to the counter 804 every predetermined time interval. Zero signal; the counter 804 clears the count result of the counter 804 according to the clear signal.
  • the counter 804 sends a reflected signal to the driving circuit 803 when the counting result is not cleared by the processor 802 so that the counting state is full; the driving circuit 803 controls the working state of the reflection controlling device 8016 according to the reflected signal to control
  • the signal of the second band is reflected by the mirror 8015 and the second wavelength division multiplexing filter 8014 in turn and enters the fiber interface 8011.
  • the ONU can spontaneously control the signal of the second band to be reflected to the fiber interface 301 in the event of a jam, so as to report the fault information to the OLT by reporting the signal of the second band back to the management side, so that the ONU can report the fault spontaneously. Fault information to improve the efficiency and accuracy of optical path fault location.
  • the processor 802 is respectively connected to the photoelectric converter 8013 and the electro-optical converter 8017 included in the optical module 801.
  • the processor 802 transmits a conversion control signal to the photoelectric converter 8013, and the photoelectric converter 8013 converts the signal L1 of the first wavelength band into an electrical signal when receiving the conversion control signal; the processor 802 transmits the optical signal generation to the electro-optical converter 8017.
  • the signal, the electro-optic converter 8017 converts the electrical signal into an upstream optical signal upon receiving the optical signal generating signal.
  • the uplink optical signal carries information reported by the ONU to the OLT.
  • the optical signal L received by the optical interface 8011 can be understood as a downlink optical signal.
  • the embodiment of the present application provides another PON system.
  • the architecture of the PON system can be seen in FIG. 1 and the foregoing description.
  • the PON system provided by the embodiment of the present application is another PON provided by the embodiment of the present application.
  • the ONU in the system is the above ONU including the optical module.
  • a private protocol exists between the ONU and the OLT to implement control of the ONU by the OLT
  • the private protocol may be, for example, a multipoint control protocol.
  • Each ONU has a unique device identifier, and the device identifier may be, for example, a Logical Link Identifier (LLID) number, and the LLID number is a number.
  • the LLID number is assigned to the ONU when the ONU is online.
  • the LLID number can be assigned to the ONU through the OLT.
  • the device identifier of the ONU can be used to distinguish between the ONU and the other ONUs in the PON system, and can also be used as an address for communication between the ONU and the OLT.
  • the OLT can send a control signal to the ONU according to the device identifier of the ONU to implement the ONU. control.
  • the OLT may also determine, according to the device identifier in the data frame, which data frame is sent by the ONU when receiving the data frame sent by the ONU.
  • the OLT sends a reflection instruction to the first ONU according to the device identifier of the first ONU, where the first ONU is any one of the multiple ONUs in the PON system, and the first ONU controls the first ONU according to the reflection instruction.
  • the reflection controls the working state of the device; the OLT sends a test command to the OTDR, and the OTDR sends a test optical signal to the plurality of ONUs in the PON network according to the test command, and the test optical signal is the optical signal received by the optical interface included in the first ONU.
  • the first ONU uses the reflection control device to control whether the test optical signal is reflected to the optical fiber interface via the mirror included in the first ONU and the second wavelength division multiplexing filter to reflect the test optical signal back to the OTDR Or, the test optical signal is not reflected back to the OTDR.
  • the reflection control device is a magnetic induction device or a piezoelectric ceramic.
  • the reflection control device controls the test light signal via The mirror and the second wavelength division multiplexed filter are reflected to the fiber optic interface to reflect the test light signal back to the OTDR.
  • the reflective control device controls the test optical signal not to be reflected to the fiber optic interface to reflect the test optical signal back to the OTDR.
  • the reflection control device is a photoelectric crystal.
  • the refractive index of the photoelectric crystal is the first refractive index
  • the photoelectric crystal controls the test optical signal. Reflected to the fiber optic interface via the mirror and the second wavelength division multiplexed filter to reflect the test light signal back to the OTDR.
  • the refractive index of the phototransistor is the second refractive index
  • the photonic crystal control test optical signal cannot be reflected to the fiber optic interface to reflect the test optical signal back to the OTDR.
  • the reflection control device is a liquid crystal.
  • the liquid crystal When the first ONU controls the liquid crystal to be in a power-off state according to the reflection instruction, the liquid crystal is blocked, and the liquid crystal control test optical signal cannot be reflected to the optical fiber interface to test the optical signal. Does not reflect back to the OTDR.
  • the liquid crystal When the first ONU controls the liquid crystal to be in a power-on state according to the reflection command, the liquid crystal transmits light, and the liquid crystal control test light signal is reflected to the fiber interface via the mirror and the second wavelength division multiplexing filter to reflect the test light signal back to the OTDR.
  • each ONU can selectively reflect the test optical signal back to the OTDR under the control of the OLT, or the test optical signal is not reflected back to the OTDR, so that the OLT can detect one or a certain part of the branch in a targeted manner.
  • Optical path performance of fiber When the OLT only controls the first ONU to reflect the test optical signal back to the OTDR, if the OTDR does not receive the test optical signal reflected by the first ONU, it determines that an optical path failure occurs on the optical fiber branch corresponding to the first ONU, for example, the optical fiber may be broken.
  • a fault occurs inside the first ONU; if the OTDR receives the test light signal reflected back by the first ONU, forming a reflection peak of the test light signal reflected back by the first ONU, so that the first ONU corresponding to the reflection peak can be calculated according to the reflection peak
  • the E2E loss on the fiber branch determines the optical path performance of the fiber branch corresponding to the first ONU.
  • the above PON system can accurately determine the E2E loss of a single branch and accurately locate the fault of the branch fiber.
  • the OLT can control the ONU to reflect the test optical signal sent by the OTDR back to the OTDR or not back to the OTDR by controlling the working state of the reflection control device included in the ONU, so that the OLT can be targeted. Detecting the optical path performance of a certain or some branch fiber, corresponding to the reflection peak of the test light signal reflected by the branch fiber or the branch fiber, effectively avoiding the occurrence of dense reflection peaks, thereby accurately determining the E2E of the single branch. Loss and the ability to accurately locate faults in the branch fiber.
  • FIG. 9 is a schematic flowchart of a signal processing method according to an embodiment of the present application.
  • the signal processing method described in the embodiments of the present application is applied to an ONU in each of the foregoing embodiments, where the ONU includes The optical module, the method includes:
  • the ONU receives a reflection instruction sent by the OLT.
  • a private protocol exists between the ONU and the OLT to implement control of the ONU by the OLT.
  • the ONU receives a reflection instruction sent by the OLT according to the device identifier of the ONU.
  • the ONU receives a test optical signal sent by an OTDR.
  • the ONU controls an operating state of the optical module according to the reflection instruction, to control the optical module to reflect the test optical signal back to the OTDR, or control the optical module to control the optical signal. Not reflected back to the OTDR.
  • the ONU switches the working state of the optical module according to the reflection instruction, for example, the working state of the optical module is switched from the first electrical state to the second electrical state, or the working state of the optical module is determined by the second state.
  • the electrical state is switched to a first electrical state; the first electrical state can be a first electrical state and the second electrical state can be a second electrical state.
  • the first electrical state is power-off, and the second electrical state is powered-on; or the first electrical state is powered-on, and the second electrical state is powered-off.
  • the optical module when the ONU switches the working state of the optical module to the first electrical state according to the reflection instruction, the optical module reflects the test optical signal back to the OTDR.
  • the optical module does not reflect the test optical signal back to the OTDR.
  • the ONU can selectively reflect the test optical signal back to the OTDR under the control of the OLT, or the test optical signal is not reflected back to the OTDR, so that the OLT can specifically detect the optical path of a certain or some branch fiber. Performance, improve the detection efficiency of optical path performance and improve the accuracy of optical path fault location.
  • the working state of the optical module specifically refers to the working state of the reflective control device included in the optical module.
  • the specific implementation manner of controlling whether the test optical signal is returned to the OTDR under different working states of the optical module may be referred to the foregoing description. , will not repeat them here.
  • the ONU when the ONU is offline, the ONU automatically controls the working state of the optical module, and reflects the test optical signal back to the OTDR to report the fault information to the OLT, thereby improving the efficiency and accuracy of the optical path fault location.
  • the ONU further includes a counter, and the counter is connected to the optical module, and the counter controls the working state of the optical module in the ONU to start counting when the test optical signal is not reflected back to the OTDR; the ONU is preset every time. The interval clears the count result of the counter; wherein, if the count result of the counter is not cleared by the ONU and the count state of the counter is full, the optical module is reflected by the counter to reflect the test light signal back to the OTDR.
  • the counter controls the working state of the optical module to control the optical module to reflect the test optical signal back to the OTDR.
  • the ONU can reflect the test optical signal back to the OTDR in the case of a stuck condition, so as to report the fault information to the OLT, thereby improving The efficiency and accuracy of optical path fault location.
  • the embodiment of the present application further provides a computer readable storage medium, where the computer storage medium stores a computer program, where the computer program includes program instructions, and when the program instructions are executed by the computer, the computer is executed in the embodiment corresponding to FIG.
  • the computer can be part of the ONU mentioned above.
  • the embodiment of the present application further provides a computer program product, where the computer program product includes program instructions, when executed by a computer, is used to execute the method described in the embodiment corresponding to FIG. 9, the computer program may be Part of the program that is stored in the ONU.
  • the optical module, the ONU, the PON system, and the signal processing method provided by the embodiments of the present application are described in detail.
  • the principles and implementation manners of the present application are described in the specific examples.
  • the description of the above embodiments is only The structure, the method and the core idea of the present application are used to help understand the present application; at the same time, in the light of the idea of the present application, there will be changes in the specific embodiment and the scope of application.
  • the contents of this specification are not to be construed as limiting the application.

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Abstract

L'invention concerne un module optique, une ONU (103), un système de PON, et un procédé de traitement de signal, le module optique (801) comportant une interface (8011) de fibre optique servant à recevoir des signaux optiques, un premier filtre (302) de multiplexage par répartition en longueur d'onde, et un convertisseur optique-électrique (8013), le premier filtre (302) de multiplexage par répartition en longueur d'onde réfléchissant le signal d'une première gamme d'ondes d'un signal optique vers le convertisseur optique-électrique (8013), le module optique (801) comportant également un second filtre (304, 8014) de multiplexage par répartition en longueur d'onde, un miroir réfléchissant (305, 8015), et un dispositif (306, 8016) de commande de réflexion; le second filtre (304, 8014) de multiplexage par répartition en longueur d'onde réfléchit le signal d'une seconde gamme d'ondes du signal optique; le dispositif (306, 8016) de commande de réflexion commande l'angle d'incidence entre la surface réfléchissante du miroir réfléchissant (305, 8015) et le signal de la seconde gamme d'ondes incident sur la surface réfléchissante, afin de commander si le signal de la seconde gamme d'ondes est réfléchi via le miroir réfléchissant (305, 8015) et le second filtre (304, 8014) de multiplexage par répartition en longueur d'onde vers l'interface (8011) de fibre optique; ou le dispositif (306, 8016) de commande de réflexion commande la puissance optique du signal de la seconde gamme d'ondes incident sur le miroir réfléchissant (305, 8015), afin de commander si le signal de la seconde gamme d'ondes est réfléchi via le miroir réfléchissant (305, 8015) et le second filtre (304, 8014) de multiplexage par répartition en longueur d'onde vers l'interface (8011) de fibre optique.
PCT/CN2017/102441 2017-09-20 2017-09-20 Module optique, onu, système de pon, et procédé de traitement de signal WO2019056204A1 (fr)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
GB2625380A (en) * 2022-12-16 2024-06-19 British Telecomm Apparatus, system and method for testing a fibre optic network

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