CN109412013B - Wavelength tunable optical module, remote wavelength switching method and locking method - Google Patents
Wavelength tunable optical module, remote wavelength switching method and locking method Download PDFInfo
- Publication number
- CN109412013B CN109412013B CN201811331641.XA CN201811331641A CN109412013B CN 109412013 B CN109412013 B CN 109412013B CN 201811331641 A CN201811331641 A CN 201811331641A CN 109412013 B CN109412013 B CN 109412013B
- Authority
- CN
- China
- Prior art keywords
- wavelength
- channel switching
- low
- control information
- chip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
- H01S5/0427—Electrical excitation ; Circuits therefor for applying modulation to the laser
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/024—Arrangements for thermal management
- H01S5/02407—Active cooling, e.g. the laser temperature is controlled by a thermo-electric cooler or water cooling
- H01S5/02415—Active cooling, e.g. the laser temperature is controlled by a thermo-electric cooler or water cooling by using a thermo-electric cooler [TEC], e.g. Peltier element
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Semiconductor Lasers (AREA)
Abstract
The invention relates to a wavelength tunable optical module, a remote wavelength switching method and a locking method, wherein the optical module comprises a controller, an APD receiving circuit, a DBR laser, a golden finger electrical interface and a driving clock chip, and the APD receiving circuit comprises an APD chip, a low-pass filter, a detection and sampling hold circuit; according to the invention, wavelength channel switching control information corresponding to each standard wavelength in a full-band is stored in a controller, when wavelength channel switching is required to be carried out on an RRU end tunable optical module, the wavelength channel switching control information is loaded on a low-frequency electric signal of a driving clock chip at a BBU end, then the low-frequency electric signal is loaded on a laser beam through a DBR laser, so that a low-frequency modulation electric signal carrying the wavelength channel switching control information is generated, an RRU end APD receiving circuit receives the low-frequency modulation electric signal, extracts the wavelength channel switching control information therein, and the controller controls the BBU end tunable optical module to carry out the wavelength channel switching according to the wavelength channel switching control information.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a wavelength tunable optical module, a remote wavelength switching method, and a locking method.
Background
Tunable optical modules are of great interest in Dense Wavelength Division Multiplexing (DWDM) communication systems. The tunable optical module can freely configure the wavelength of the output light of the module, can improve the utilization rate of system resources, improve the dynamic property and flexibility of network nodes, and reduce the number of backup modules and the maintenance cost of the existing network.
In the miniaturized packaged tunable optical module, a monolithically integrated Bragg reflection grating (DBR) tunable laser is generally adopted, a current control chip MAX5112 is integrated in the DBR tunable laser applied to the product, and the output optical frequency, the power and the wavelength channel can be adjusted by setting the current control chip MAX 5112. In addition, a laser driving chip GN2044 is used for changing the phase difference of two Mach-Zehnder arms in the laser to realize the modulation of high-speed optical service signals. The tunable laser, the laser driving chip and the current control circuit form an originating circuit of the tunable optical module. The APD (avalanche photodiode) chip, the APD voltage control circuit, and the TIA amplifying circuit constitute the receiving end part of the dimmable module.
The tunable laser has better networking dynamics and flexibility in networking, and realizes the specific uplink channel configuration of the optical module through wavelength switching, and the conventional method at present adopts specific configuration before networking, for example, the conventional method relates to current network rectification, and the optical module at the RRU (Remote Radio Unit) end is required to be taken back to the BBU (Building Baseband Unit) end connecting plate and is switched through an electric port control channel, so that the networking flexibility is greatly reduced, and the line maintenance cost is increased.
Disclosure of Invention
In order to solve the technical problems, a wavelength tunable optical module, a remote wavelength switching method and a locking method are provided.
As a first aspect of the present invention, there is provided a wavelength tunable optical module comprising a controller, an APD receiving circuit, a DBR laser, a drive clock chip, and a gold finger electrical interface, the APD receiving circuit comprising an APD chip, a low pass filter, a detection and sample hold circuit; the APD chip is electrically connected with the detection and sample-hold circuit through a low-pass filter, the detection and sample-hold circuit, the driving clock chip and the DBR laser are all electrically connected with the controller, and the driving clock chip is also electrically connected with the DBR laser and the golden finger electrical interface respectively;
the driving clock chip is used for shaping and amplifying the low-frequency electric signals transmitted from the golden finger electric interface;
the controller is used for storing wavelength channel switching control information corresponding to each standard wavelength in the full wave band, loading the wavelength channel switching control information on a low-frequency electric signal of the driving clock chip, thereby generating a low-frequency modulation electric signal carrying the wavelength channel switching control information,
the DBR laser is used for generating a laser beam and modulating the laser beam and the low-frequency modulation electric signal so as to generate a modulation optical signal carrying wavelength channel switching control information;
the APD chip is used for converting a received modulated optical signal into a corresponding electric signal, the low-pass filter is used for extracting a low-frequency modulated electric signal in the electric signal, and the detection and sample hold circuit is used for extracting wavelength channel switching control information in the low-frequency modulated electric signal.
Further, the DBR laser comprises a laser, a current control chip, a TEC electric refrigerating module and an MZM modulator, wherein the TEC electric refrigerating module, the current control chip and the MZM modulator are all electrically connected with the controller, the laser and the clock driving chip are all electrically connected with the MZM modulator, the laser is arranged on the TEC electric refrigerating module, the TEC electric refrigerating module is used for controlling the temperature of the laser, the current control chip is electrically connected with the laser and used for providing phase current for the laser and controlling the laser to generate a laser beam, and the MZM modulator is used for modulating the laser beam and the low-frequency modulation electric signal so as to generate a modulation optical signal carrying wavelength channel switching control information.
Further, the TEC electric refrigerating module comprises a TEC electric refrigerator and a TEC driver, and the TEC electric refrigerator is electrically connected with the controller through the TEC driver.
Further, the optical power detector is used for detecting the optical power, and the wavelength detector is used for detecting the wavelength frequency.
Further, the device further comprises an metalon optical frequency monitoring circuit and an optical splitter b, the number of the wavelength detectors is two, namely a wavelength detector PD1 and a wavelength detector PD2, the third path of optical signals are divided into two paths through the optical splitter b, one path of optical signals is directly output to the wavelength detector PD1, the other path of optical signals is output to the wavelength detector PD2 through the metalon optical frequency monitoring circuit, and the wavelength detector PD1 and the wavelength detector PD2 are electrically connected with the controller.
Further, the APD receiving circuit further comprises an APD voltage control circuit, a TIA amplifying circuit and a clock recovery circuit, wherein the APD voltage control circuit is electrically connected with the APD chip and used for providing stable working voltage for the APD chip, the APD chip is electrically connected with the clock recovery circuit through the TIA amplifying circuit, and the clock recovery circuit is electrically connected with the controller and the golden finger electrical interface respectively.
As a second aspect of the present invention, there is provided a remote wavelength switching method employing a tunable optical module as described in any one of the above, the method comprising:
the BBU end tunable optical module transmits a modulated optical signal carrying wavelength channel switching control information;
an APD receiving circuit of the RRU end tunable optical module receives a modulated optical signal, an APD Rose of the APD receiving circuit converts the received modulated optical signal into an electric signal, a low-frequency modulated electric signal in the electric signal is extracted through a low-pass filter, wavelength channel switching control information in the low-frequency modulated electric signal is extracted through a detection and sample hold circuit, and a controller acquires the wavelength channel switching control information and controls the RRU end tunable optical module to switch wavelength channels according to the wavelength channel switching control information.
Further, the remote wavelength switching method further includes:
and storing wavelength channel switching control information corresponding to each standard wavelength in the full wave band in the controller in advance, loading the wavelength channel switching control information on a low-frequency electric signal of a driving clock chip when the wavelength channel switching is required to be carried out on the RRU end tunable optical module, so as to generate a low-frequency modulation electric signal carrying the wavelength channel switching control information, and modulating a laser beam generated by the DBR laser with the low-frequency modulation electric signal so as to generate a modulation optical signal carrying the wavelength channel switching control information.
As a third aspect of the present invention, there is provided a wavelength locking method employing a wavelength tunable optical module as described above, the method comprising:
the controller reads the photoelectric values of the wavelength detector PD1 and the wavelength detector PD2, calculates the Ratio1 of the photoelectric values of the wavelength detector PD1 and the wavelength detector PD2, and stores the Ratio0 of the photoelectric values of the wavelength detector PD1 and the wavelength detector PD2 corresponding to the standard wavelength light of each wavelength channel in advance;
comparing the Ratio1 with the corresponding wavelength channel Ratio0, if the Ratio1-Ratio0 is greater than or equal to 0.5, considering the wavelength output to be in an unstable range, continuously adjusting the phase current through the current control chip, thereby adjusting the Ratio1 of the photoelectric values of the wavelength detector PD1 and the wavelength detector PD2 until the Ratio1-Ratio0 is less than 0.5, considering the wavelength output to be in a stable range, finishing the phase current adjustment, and finishing the wavelength locking.
Further, the wavelength locking method further includes:
when the Ratio of the current control chip is |Ratio1-Ratio0| >0.2, the current control chip adjusts the phase current according to the Ratio0 of the corresponding wavelength channel and the Slope value Slope of the standard wavelength light of the corresponding wavelength channel; when the absolute Ratio1-Ratio0 is smaller than or equal to 0.2 and larger than or equal to 0.5, the current control chip adjusts the phase current according to the Slope value Slope, and the adjustment amplitude is 2 LSBs each time.
The invention has the beneficial effects that:
according to the wavelength tunable optical module, the remote wavelength switching method and the wavelength locking method, when the wavelength channel switching is required to be carried out on the RRU-end tunable optical module, the wavelength channel switching control information is loaded on a low-frequency electric signal of a driving clock chip at the BBU end, then the low-frequency electric signal is loaded on a laser beam through a DBR laser, so that a low-frequency modulation electric signal carrying the wavelength channel switching control information is generated, an APD receiving circuit at the RRU end receives the low-frequency modulation electric signal, the wavelength channel switching control information is extracted, a controller controls the BBU-end tunable optical module to carry out the wavelength channel switching according to the wavelength channel switching control information, so that the optical module circuit at the RRU end is directly controlled to carry out the wavelength switching at the BBU end, in addition, the Ratio Ratio1 of the photoelectric current on the wavelength detector PD1 and the photoelectric current on the wavelength detector PD2 is calculated, the Ratio Ratio1 of the standard Ratio Ratio0 of the standard wavelength of the corresponding to the wavelength channel is compared, and if the Ratio Ratio1 and the standard Ratio Ratio0 are very close to the standard wavelength of the corresponding wavelength channel, otherwise, the current is regarded to be stable in the phase control range, and the current is regulated. When the Ratio1-Ratio0 is larger than 0.2, the locking is performed by adopting a coarse locking mode, namely, the phase current value to be modified is calculated according to the pre-stored Slope value Slope and the standard Ratio 0. When the coarse lock adjusting range is not met, the phase of the current control chip is adjusted in a closed loop, and the current is subjected to fine adjustment of the least significant bit according to the Slope value Slope, so that the actually measured monitoring current Ratio1 meets the locking precision requirement, and the wavelength is locked.
Drawings
Fig. 1 is a schematic diagram of a wavelength tunable optical module hardware framework according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an MZM modulator and a wavelength detector of a DBR laser according to an embodiment of the present invention;
fig. 3 is a data code format of wavelength channel switching control information according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a networking of a dimmable module according to an embodiment of the present invention.
Detailed Description
The principles and features of the present invention are described below in connection with examples, which are set forth only to illustrate the present invention and not to limit the scope of the invention.
1-2, the wavelength tunable optical module provided by the embodiment of the invention comprises a controller, an APD receiving circuit, a DBR laser, a driving clock chip and a golden finger electrical interface, wherein the APD receiving circuit comprises an APD chip, a low-pass filter, a detection circuit and a sample hold circuit; the APD chip is electrically connected with the detection and sample-hold circuit through a low-pass filter, the detection and sample-hold circuit, the driving clock chip and the DBR laser are all electrically connected with the controller, and the driving clock chip is also electrically connected with the DBR laser and the golden finger electrical interface respectively;
the driving clock chip is used for shaping and amplifying the low-frequency electric signals transmitted from the golden finger electric interface;
the controller is used for storing wavelength channel switching control information corresponding to each standard wavelength in the full wave band, and loading the wavelength channel switching control information on a low-frequency electric signal of the driving clock chip so as to generate a low-frequency modulation electric signal carrying the wavelength channel switching control information;
the DBR laser is used for generating a laser beam and modulating the laser beam and the low-frequency modulation electric signal so as to generate a modulation optical signal carrying wavelength channel switching control information;
the APD chip is used for converting a received modulated optical signal into a corresponding electric signal, the low-pass filter is used for extracting a low-frequency modulated electric signal in the electric signal, and the detection and sample hold circuit is used for extracting wavelength channel switching control information in the low-frequency modulated electric signal.
The DBR laser comprises a laser, a current control chip, a TEC electric refrigerating module and an MZM modulator, wherein the TEC electric refrigerating module, the current control chip and the MZM modulator are all electrically connected with the controller, the current control chip is preferably a Max5112 chip, the laser and the clock driving chip are all electrically connected with the MZM modulator, the laser is arranged on the TEC electric refrigerating module, the TEC electric refrigerating module is used for controlling the temperature of the laser, the current control chip is electrically connected with the laser and used for providing phase current for the laser, controlling the laser to generate laser beams with different frequencies by changing the phase current, and the MZM modulator is used for modulating the laser beams with the low-frequency modulation electric signals so as to generate modulation light signals carrying wavelength channel switching control information.
The TEC electric refrigerating module comprises a TEC electric refrigerator and a TEC driver, and the TEC electric refrigerator is electrically connected with the controller through the TEC driver.
The optical module further comprises an optical power detector, a wavelength detector and an optical splitter a, the modulated optical signal is divided into three paths of optical signals through the optical splitter a, the first path of optical signal is an optical signal output outwards, the second path of optical signal is used for detecting optical power through the optical power detector, and the third path of optical signal is used for detecting wavelength frequency through the wavelength detector.
The optical module further comprises an Ethernet optical frequency monitoring circuit and an optical splitter b, the number of the wavelength detectors is two, the wavelength detectors PD1 and the wavelength detector PD2 are respectively arranged, and the third optical signal is split into two paths through the optical splitter b. The Ratio of the two paths of photocurrent signals is directly output to the wavelength detector PD1 when the wavelength is changed, the other path of photocurrent signals is output to the wavelength detector PD2 through the wavelength transmittance sensitive metalon optical frequency monitoring circuit, the wavelength detector PD1 and the wavelength detector PD2 are electrically connected with the controller, the wavelength of the modulated optical signals is changed by setting the phase current output by the current control chip, and the Ratio of the two paths of photocurrent values is also changed when the wavelength is changed.
Preferably, the optical splitter c is further included, the laser beam emitted by the laser is split into two paths through the optical splitter c, one path of laser beam is modulated with the low-frequency modulation electric signal through the MZM modulator to generate a modulation optical signal carrying wavelength channel switching control information, the modulation optical signal after modulation is combined with the other path of unmodulated laser beam, when the two paths of optical signals are identical, the modulation optical signal is enhanced, and when the phases of the two paths of optical signals are opposite, the modulation optical signal is attenuated.
The APD receiving circuit further comprises an APD voltage control circuit, a TIA amplifying circuit and a clock recovery circuit, wherein the APD voltage control circuit is electrically connected with the APD chip and used for providing stable working voltage for the APD chip, the APD chip is electrically connected with the clock recovery circuit through the TIA amplifying circuit, and the clock recovery circuit is electrically connected with the controller and the golden finger electrical interface respectively.
As shown in fig. 3, the wavelength channel switching control information has a specific data format, including a preamble, a control command ID, set data, a check code, and the like, and can be controlled by a timer interrupt built in the controller, where the current control chip is modified in the timer interrupt function to generate a coded signal, without excluding modulation of the coded signal by other means, and the single wavelength channel switching control information includes 5 bytes of data, where 0100110 is used as the preamble data format, so that it is more convenient for the receiving end to implement signal analysis by an algorithm, and the command content is wavelength channel information of 2 bytes, for example, a 195 identifier 191.95GHz, and at this time, the command ID is set to be the wavelength channel setting. It should be clear that the command ID may include multiple types, including RRU end feedback information and BBU end read-write control information, etc., and the low frequency continuous analog signal is collected by the AD of the MCU, where the collection rate of the analog signal is set to 1000Hz, that is, 5 samples can be implemented in an ideal case when a single bit signal, and 2 sampling points exist in an extreme case when the signal changes along, so that by using a median filtering method, bit information judgment can be performed on the average value of the remaining 3 sampling results, and after the MCU parses the wavelength channel switching control information, the registers of the current control chip in the laser are reconfigured to implement wavelength channel chopping.
The controller executes sampling rate which is integer N times (N > 1) of the clock rate of the modulation signal, the processor AD is used for collecting low-frequency information, software analyzes the 0 and 1 signals amplified by the preamble part and realizes judgment, the command ID of the control information, the channel number of the working wave band to be switched and the check code are identified, all Tosa (Transmitter Optical Subassembly) control parameters supporting the working wave band are stored in the controller, the wavelength channel switching control information sent by the BBU optical module is received, and the controller controls the laser to realize wave cutting. The cutting process comprises the steps that the DBR laser gradually reduces the optical power, the Tosa control parameters including wavelength setting current, VOA control current, resonant cavity mode setting current and the like are read from a storage space, then a corresponding register of the laser current control chip is controlled and set, the laser power is started to slowly emit light, and the wavelength locking is controlled in real time.
FIG. 4 is a schematic diagram of a networking of tunable optical modules in this embodiment, where there are multiple tunable optical modules at the BBU end, each of which transmits light in different working bands and combines the light to a communication link through a MUX/DEMUX (multiplexing/demultiplexing device), the RRU end that splits the light to different positions is remotely transmitted through an optical fiber and is respectively in one-to-one butt joint with the optical modules at the RRU end, so that it is supported to change the output channels of the tunable optical modules through an electrical interface of a golden finger, and further, a command for controlling the switching channels is transmitted through the tunable optical modules at the BBU end, so that the remote optical modules are controlled to perform cutting, the flexibility of dynamic networking is improved, and the luminescence is lambda through networking 11 The adjustable light module changes the luminous wavelength of the RRU end into lambda by loading wavelength channel switching control information 12 Is lambda 13 。
As another embodiment of the present invention, a tunable optical module as described above is used by a remote wavelength switching method, which includes:
the BBU end tunable optical module transmits a modulated optical signal carrying wavelength channel switching control information;
an APD receiving circuit of the RRU end tunable optical module receives a modulated optical signal, an APD Rose of the APD receiving circuit converts the received modulated optical signal into an electric signal, a low-frequency modulated electric signal in the electric signal is extracted through a low-pass filter, wavelength channel switching control information in the low-frequency modulated electric signal is extracted through a detection and sample hold circuit, and a controller acquires the wavelength channel switching control information and controls the RRU end tunable optical module to switch wavelength channels according to the wavelength channel switching control information.
Preferably, the remote wavelength switching method further includes:
and storing wavelength channel switching control information corresponding to each standard wavelength in the full wave band in the controller in advance, loading the wavelength channel switching control information on a low-frequency electric signal of a driving clock chip when the wavelength channel switching is required to be carried out on the RRU end tunable optical module, so as to generate a low-frequency modulation electric signal carrying the wavelength channel switching control information, and modulating a laser beam generated by the DBR laser with the low-frequency modulation electric signal so as to generate a modulation optical signal carrying the wavelength channel switching control information.
As still another embodiment of the present invention, there is provided a wavelength locking method, employing a tunable optical module as described above, the method including:
the controller reads the photoelectric values of the wavelength detector PD1 and the wavelength detector PD2, calculates the Ratio1 of the photoelectric values of the wavelength detector PD1 and the wavelength detector PD2, and stores the Ratio0 of the photoelectric values of the wavelength detector PD1 and the wavelength detector PD2 corresponding to the standard wavelength light of each wavelength channel in advance;
comparing the Ratio1 with the corresponding wavelength channel Ratio0, if the Ratio1-Ratio0 is greater than or equal to 0.5, considering the wavelength output to be in an unstable range, continuously adjusting the phase current through the current control chip, thereby adjusting the Ratio1 of the photoelectric values of the wavelength detector PD1 and the wavelength detector PD2 until the Ratio1-Ratio0 is less than 0.5, considering the wavelength output to be in a stable range, finishing the phase current adjustment, and finishing the wavelength locking.
Preferably, when |Ratio1-Ratio0| is greater than 0.2, the current control chip adjusts the phase current according to Ratio0 of the corresponding wavelength channel and the Slope value Slope of the standard wavelength light of the corresponding wavelength channel; when the |Ratio1-Ratio0| is smaller than or equal to 0.2 and larger than or equal to 0.5, the current control chip adjusts the phase current according to the Slope value Slope, and the adjustment amplitude is 2 LSBs (Least Significant Bit, least significant bits) each time.
The standard ratio Rotio0 and the Slope value Slope are obtained by calibrating and testing the real-time laser light emitting wavelength actual measurement and the adjustment phase current by adopting a wavelength meter, and the specific steps are as follows:
1) And regulating phase current, namely actually measuring an output wavelength through a wavemeter, recording the output phase current of a current control chip as I1 when the actually measured output wavelength of the wavemeter is the standard wavelength of a corresponding wavelength channel, sampling the photoelectric current values of PD1 and PD2 by a controller, and calculating the photoelectric current Ratio of PD1 and PD2 as Ratio1, namely the standard Ratio when the actually measured output wavelength of the wavemeter is the standard wavelength of the wavelength channel.
2) And continuously adjusting the phase current, when the actually measured output wavelength of the wavemeter is the standard wavelength-16 GHz, recording that the output phase current of the current control chip is I2 respectively, calculating the Ratio of the photoelectric values on PD1 and PD2 to be Ratio2, and when the actually measured output wavelength of the wavemeter is the standard wavelength +16GHz, recording that the output phase current of the current control chip is T3 respectively, and reading that the Ratio of the photoelectric values on PD1 and PD2 is Ratio3 by the controller.
3) Since the transmission characteristics of the etalon light frequency monitoring circuit for light of varying frequency are linear. The Slope value slope= (Ratio 2-Ratio 3)/(I2-T3) at the time of frequency change can be calculated.
In the above embodiment, by reading the photoelectric current values on the wavelength detector PD1 and the wavelength detector PD2, the Ratio1 of the photoelectric current values on the wavelength detector PD1 and the wavelength detector PD2 is calculated, by comparing the Ratio1 with the standard Ratio0 at the standard wavelength of the corresponding wavelength channel, if the Ratio1 and the standard Ratio0 are very close, the wavelength output is considered to be in the stable range, otherwise, the output of the phase current of the current control chip is adjusted. When the Ratio1-Ratio0 is larger than 0.2, the locking is performed by adopting a coarse locking mode, namely, the phase current value to be modified is calculated according to the pre-stored Slope value Slope and the standard Ratio 0. When the coarse lock adjusting range is not met, the phase of the current control chip is adjusted in a closed loop, and the current is subjected to fine adjustment of the least significant bit according to the Slope value Slope, so that the actually measured monitoring current Ratio1 meets the locking precision requirement, and the wavelength is locked.
In addition, in the wavelength locking process, the temperature of the laser is controlled, in the embodiment, the TEC electric refrigerating module is arranged in the DBR laser, and the target temperature of the TEC electric refrigerating module is set to be a constant value, so that the output wavelength of the laser is not interfered by temperature change. The TEC refrigeration chip keeps the internal temperature of the laser constant, and a closed-loop PID algorithm is usually implemented by software to control, but in practice, the thermistor position reported by the temperature in the TEC refrigeration module is generally close to the laser tube shell, and the resistance value changes due to the change of the external environment temperature of the laser.
In the invention, the phase current value of the current control chip in the DBR laser is unchanged. The working environment temperature of the laser is changed from-5 ℃ to 75 ℃, the output light is actually measured and calibrated through an oscilloscope, and the output light frequency of the tunable optical module is found to deviate under different environment temperatures. Thus, the target temperature in the TEC electric refrigerating module can be obtained under the condition of different module shell temperatures. Furthermore, the calibration steps such as the adjustment of the ambient temperature and the target temperature are subdivided into a point of every 5 ℃, the corresponding target temperature value is stored, and a linear interpolation mode is adopted in the interval.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (10)
1. The wavelength tunable optical module is characterized by comprising a controller, an APD receiving circuit, a DBR laser, a driving clock chip and a golden finger electrical interface, wherein the APD receiving circuit comprises an APD chip, a low-pass filter, a detection and sampling hold circuit; the APD chip is electrically connected with the detection and sample-hold circuit through a low-pass filter, the detection and sample-hold circuit, the driving clock chip and the DBR laser are all electrically connected with the controller, and the driving clock chip is also electrically connected with the DBR laser and the golden finger electrical interface respectively;
the driving clock chip is used for receiving and shaping and amplifying the low-frequency electric signals transmitted from the golden finger electric interface;
the controller is used for storing wavelength channel switching control information corresponding to each standard wavelength in the full wave band, loading the wavelength channel switching control information on a low-frequency electric signal of the driving clock chip, thereby generating a low-frequency modulation electric signal carrying the wavelength channel switching control information,
the DBR laser is used for generating a laser beam and modulating the laser beam and the low-frequency modulation electric signal so as to generate a modulation optical signal carrying wavelength channel switching control information;
the APD chip is used for converting a received modulated optical signal into a corresponding electric signal, the low-pass filter is used for extracting a low-frequency modulated electric signal in the electric signal, and the detection and sample hold circuit is used for extracting wavelength channel switching control information in the low-frequency modulated electric signal;
the DBR laser comprises an MZM modulator, wherein the MZM modulator is used for modulating the laser beam and the low-frequency modulation electric signal so as to generate a modulation optical signal carrying wavelength channel switching control information.
2. The wavelength tunable optical module of claim 1, wherein the DBR laser comprises a laser, a current control chip, and a TEC electrical refrigeration module, wherein the TEC electrical refrigeration module, the current control chip, and the MZM modulator are all electrically connected to the controller, wherein the laser and the driving clock chip are all electrically connected to the MZM modulator, wherein the laser is disposed on the TEC electrical refrigeration module, wherein the TEC electrical refrigeration module is configured to control a temperature of the laser, wherein the current control chip is electrically connected to the laser, and wherein the current control chip is configured to provide a phase current to the laser to control the laser to generate a laser beam.
3. The wavelength tunable optical module of claim 2, wherein the TEC electrical refrigeration module comprises a TEC electrical refrigerator and a TEC driver, the TEC electrical refrigerator being electrically connected to the controller through the TEC driver.
4. The wavelength tunable optical module according to claim 2, further comprising an optical power detector, a wavelength detector, and an optical splitter a, wherein the modulated optical signal is split into three optical signals by the optical splitter a, the first optical signal is an optical signal output from the outside, the second optical signal is used for detecting the optical power by the optical power detector, and the third optical signal is used for detecting the wavelength frequency by the wavelength detector.
5. The wavelength tunable optical module according to claim 4, further comprising an metalon optical frequency monitoring circuit and an optical splitter b, wherein the number of wavelength detectors is two, namely a wavelength detector PD1 and a wavelength detector PD2, the third optical signal is split into two paths by the optical splitter b, one path of the third optical signal is directly output to the wavelength detector PD1, the other path of the third optical signal is output to the wavelength detector PD2 by the metalon optical frequency monitoring circuit, and the wavelength detector PD1 and the wavelength detector PD2 are electrically connected with the controller.
6. The wavelength tunable optical module of claim 1, wherein the APD receiving circuit further comprises an APD voltage control circuit, including a TIA amplifier circuit, and a clock recovery circuit, the APD voltage control circuit being electrically connected to the APD chip for providing a stable operating voltage for the APD chip, the APD chip being electrically connected to the clock recovery circuit through the TIA amplifier circuit, the clock recovery circuit being electrically connected to the controller and the golden finger electrical interface, respectively.
7. A method of remote wavelength switching, characterized in that a wavelength tunable optical module according to any one of claims 1-6 is used, the method comprising:
the BBU end tunable optical module transmits a modulated optical signal carrying wavelength channel switching control information;
an APD receiving circuit of the RRU end tunable optical module receives a modulated optical signal, an APD Rosa of the APD receiving circuit converts the received modulated optical signal into an electric signal, a low-frequency modulated electric signal in the electric signal is extracted through a low-pass filter, wavelength channel switching control information in the low-frequency modulated electric signal is extracted through a detection and sample hold circuit, and a controller acquires the wavelength channel switching control information and controls the RRU end tunable optical module to switch wavelength channels according to the wavelength channel switching control information.
8. The method of remote wavelength switching according to claim 7, further comprising:
and storing wavelength channel switching control information corresponding to each standard wavelength in the full wave band in the controller in advance, loading the wavelength channel switching control information on a low-frequency electric signal of a driving clock chip when the wavelength channel switching is required to be carried out on the RRU end tunable optical module, so as to generate a low-frequency modulation electric signal carrying the wavelength channel switching control information, and modulating a laser beam generated by the DBR laser with the low-frequency modulation electric signal so as to generate a modulation optical signal carrying the wavelength channel switching control information.
9. A method of wavelength locking, employing the wavelength tunable optical module of claim 5, the method comprising:
the controller reads the photoelectric values of the wavelength detector PD1 and the wavelength detector PD2, calculates the Ratio1 of the photoelectric values of the wavelength detector PD1 and the wavelength detector PD2, and stores the standard Ratio0 of the photoelectric values of the wavelength detector PD1 and the wavelength detector PD2 corresponding to the standard wavelength light of each wavelength channel in advance;
comparing the Ratio1 with the corresponding wavelength channel Ratio0, if the Ratio1-Ratio0 is greater than or equal to 0.5, considering the wavelength output to be in an unstable range, continuously adjusting the phase current through the current control chip, thereby adjusting the Ratio1 of the photoelectric values of the wavelength detector PD1 and the wavelength detector PD2 until the Ratio1-Ratio0 is less than 0.5, considering the wavelength output to be in a stable range, finishing the phase current adjustment, and finishing the wavelength locking.
10. The wavelength locking method of claim 9, wherein the method further comprises: when the Ratio of the current control chip I to the Ratio of the corresponding wavelength channel I is greater than 0.2, the current control chip adjusts the phase current according to the standard Ratio of the corresponding wavelength channel II to the Ratio0 and the Slope value Slope when the frequency is changed; when the |Ratio1-Ratio0 is smaller than or equal to 0.2 and larger than or equal to 0.5, the current control chip adjusts the phase current according to the Slope value Slope, and the adjustment amplitude is 2 LSBs each time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811331641.XA CN109412013B (en) | 2018-11-09 | 2018-11-09 | Wavelength tunable optical module, remote wavelength switching method and locking method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811331641.XA CN109412013B (en) | 2018-11-09 | 2018-11-09 | Wavelength tunable optical module, remote wavelength switching method and locking method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109412013A CN109412013A (en) | 2019-03-01 |
| CN109412013B true CN109412013B (en) | 2023-08-08 |
Family
ID=65472644
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811331641.XA Active CN109412013B (en) | 2018-11-09 | 2018-11-09 | Wavelength tunable optical module, remote wavelength switching method and locking method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109412013B (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109981180B (en) | 2019-03-15 | 2020-06-30 | 武汉电信器件有限公司 | Wavelength locking optical module, device and wavelength locking method |
| CN110061800B (en) * | 2019-04-18 | 2020-08-25 | 浙江省广电科技股份有限公司 | Wavelength stabilizing system of tunable DWDM wavelength optical node |
| CN112118498B (en) * | 2019-06-20 | 2022-10-04 | 青岛海信宽带多媒体技术有限公司 | Wavelength correction method of optical module and optical network system |
| CN112152722A (en) * | 2019-06-26 | 2020-12-29 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| CN110519666B (en) * | 2019-08-16 | 2022-04-01 | 青岛海信宽带多媒体技术有限公司 | Optical module wavelength configuration method and device and optical module |
| CN110707513A (en) * | 2019-10-09 | 2020-01-17 | 深圳市欧深特信息技术有限公司 | Temperature adjusting method and system of laser and computer readable storage medium |
| CN111313972B (en) * | 2019-12-25 | 2021-06-18 | 成都优博创通信技术股份有限公司 | Wavelength tunable optical module |
| CN115133998B (en) * | 2021-03-24 | 2024-01-23 | 青岛海信宽带多媒体技术有限公司 | Optical module and wavelength self-adaption method based on message channel |
| CN113452446B (en) * | 2021-06-22 | 2023-01-20 | 青岛海信宽带多媒体技术有限公司 | Optical module and channel switching method |
| WO2023134737A1 (en) * | 2022-01-17 | 2023-07-20 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| CN114915347B (en) * | 2022-04-13 | 2024-04-02 | 瑞斯康达科技发展股份有限公司 | Wavelength tunable optical module and automatic wavelength adaptation method thereof |
| CN115480265A (en) * | 2022-10-12 | 2022-12-16 | 山东国耀量子雷达科技有限公司 | Atmospheric methane detection method with high dynamic range, methane radar and computer terminal |
| CN115348490B (en) * | 2022-10-18 | 2023-03-24 | 武汉长光科技有限公司 | Method for dynamically scheduling service wavelength channel and related device |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01177518A (en) * | 1988-01-06 | 1989-07-13 | Nec Corp | Automatic tuning control system for wavelength filter |
| JPH04250729A (en) * | 1991-01-28 | 1992-09-07 | Nec Corp | Wavelength filter automatic tuning controller |
| JPH10247877A (en) * | 1997-03-03 | 1998-09-14 | Mitsubishi Electric Corp | Device for optical analog signal transmission |
| US6304586B1 (en) * | 1998-09-11 | 2001-10-16 | New Focus, Inc. | Method and apparatus for modulating a tunable laser |
| UA23213U (en) * | 2007-01-02 | 2007-05-10 | Ivan Kozhedub Kharkiv Universi | Channel for automated following of aircrafts by direction for laser information-measuring system |
| CN102820932A (en) * | 2012-08-10 | 2012-12-12 | 武汉邮电科学研究院 | Frequency deviation self-adaptive precise compensation system and frequency deviation self-adaptive precise compensation method in coherence optical communication |
| CN103956652A (en) * | 2014-04-25 | 2014-07-30 | 南京威宁锐克信息技术有限公司 | Low-cost tunable DFB semiconductor laser device of integrated modulator and manufacturing method |
| CN106501213A (en) * | 2016-11-11 | 2017-03-15 | 中州大学 | Liquid lossless detection recognizes electronic system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2002342020A1 (en) * | 2001-10-09 | 2003-04-22 | Infinera Corporation | Transmitter photonic integrated circuit |
| US7599624B2 (en) * | 2004-12-15 | 2009-10-06 | Electronics And Telecommunications Research Institute | System and method for switching channels using tunable laser diodes |
| US9531155B2 (en) * | 2014-04-09 | 2016-12-27 | Applied Optoelectronics, Inc. | Switched radio frequency (RF) driver for tunable laser with multiple in-line sections |
-
2018
- 2018-11-09 CN CN201811331641.XA patent/CN109412013B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01177518A (en) * | 1988-01-06 | 1989-07-13 | Nec Corp | Automatic tuning control system for wavelength filter |
| JPH04250729A (en) * | 1991-01-28 | 1992-09-07 | Nec Corp | Wavelength filter automatic tuning controller |
| JPH10247877A (en) * | 1997-03-03 | 1998-09-14 | Mitsubishi Electric Corp | Device for optical analog signal transmission |
| US6304586B1 (en) * | 1998-09-11 | 2001-10-16 | New Focus, Inc. | Method and apparatus for modulating a tunable laser |
| UA23213U (en) * | 2007-01-02 | 2007-05-10 | Ivan Kozhedub Kharkiv Universi | Channel for automated following of aircrafts by direction for laser information-measuring system |
| CN102820932A (en) * | 2012-08-10 | 2012-12-12 | 武汉邮电科学研究院 | Frequency deviation self-adaptive precise compensation system and frequency deviation self-adaptive precise compensation method in coherence optical communication |
| CN103956652A (en) * | 2014-04-25 | 2014-07-30 | 南京威宁锐克信息技术有限公司 | Low-cost tunable DFB semiconductor laser device of integrated modulator and manufacturing method |
| CN106501213A (en) * | 2016-11-11 | 2017-03-15 | 中州大学 | Liquid lossless detection recognizes electronic system |
Non-Patent Citations (1)
| Title |
|---|
| 高速率光通信中的阻抗匹配研究;曹锋光等;信息通信(第6期);第1页-第3页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109412013A (en) | 2019-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109412013B (en) | Wavelength tunable optical module, remote wavelength switching method and locking method | |
| CN101057424B (en) | Device and method for collectively monitoring a wavelength in DWDM system | |
| US6353623B1 (en) | Temperature-corrected wavelength monitoring and control apparatus | |
| US8743920B2 (en) | Wavelength variable light source system | |
| US7203212B2 (en) | System and method for wavelength error measurement | |
| US9628174B2 (en) | Optical channel monitor with integral optical switch | |
| US7522845B2 (en) | WDM laser wavelength control | |
| US20160204569A1 (en) | Wavelength tunable optical transmitter | |
| CN104753599B (en) | A kind of optical module | |
| CN110365413A (en) | A kind of light load radio frequency beam shaping system based on relevant frequency comb | |
| JP2002185074A (en) | Variable wavelength optical transmitter, its output controlling method and optical communication system | |
| US6785308B2 (en) | Spectral conditioning system and method | |
| CN108768516A (en) | The laser space communication terminal of wavelength fast tunable | |
| US10715255B2 (en) | Off quadrature mach-zehnder modulator biasing | |
| WO2021043070A1 (en) | Wavelength adjusting method and related devices | |
| TWI249293B (en) | Monitoring apparatus and method of optical signal-to-noise ratio | |
| US9515738B2 (en) | Optical module | |
| CN209329392U (en) | A kind of tunable wave length optical module | |
| US6674065B2 (en) | Method and system for linearization of MOEMS tunable filter scan | |
| US20070003281A1 (en) | Active control loop for power control of optical channel groups | |
| Zou et al. | Remote wavelength tracking of strongly chirped tunable 10G MEMS-VCSEL for port-agnostic WDM fronthaul | |
| CN203554454U (en) | Passive optical network, optical link terminal (OLT) and optical module thereof | |
| KR100211583B1 (en) | The stabilizing system of laser diode for wavelength division multiplexing | |
| EP1109336B1 (en) | A method of initialisation of an optical transmitter | |
| JP6849524B2 (en) | Semiconductor laser light source |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 430000 building 12, Block E, 52 Liufang Avenue, Donghu New Technology Development Zone, Wuhan, Hubei Province Applicant after: Wuhan Liante Technology Co.,Ltd. Address before: 430000 2nd floor, building 1, Putian, China, No.20, daxueyuan Road, Donghu New Technology Development Zone, Wuhan, Hubei Province Applicant before: LINKTEL TECHNOLOGIES Co.,Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |