CN216449795U - Optical module - Google Patents

Abstract

The application discloses optical module, including round square tube body, light emitter, optical receiver and optical assembly. The light emitter and the light receiver are both embedded in the pipe orifice of the round and square pipe body. The optical assembly is arranged in the inner cavity of the round and square tube body and comprises a baffle plate and a first optical filter. The baffle is provided with a through hole, and the edge of the baffle is hermetically connected with the inner wall of the round and square pipe body and used for blocking an area except the through hole. The first optical filter is arranged on the through hole, is adhered to the lower side of the baffle and is used for absorbing light with wavelengths except for received light. And the through hole corresponds to the light receiver. In this application, the baffle not only can be through the through-hole with receiving light and penetrate light receiver, can also block other wavelength light except that receiving light and penetrate light receiver through the sealing connection with the round and square body for light receiver receives almost all receives light and only a few transmission light, further reduces optical crosstalk, improves the crosstalk index.

Description

Optical module

Technical Field

The application relates to the technical field of optical fiber communication, in particular to an optical module.

Background

The light receiving and dispatching subassembly of 40Km 50G PAM4(4level Pulse Amplitude Modulation) optical module includes optical emitter, optical receiver, round square body and optical fiber adapter, and wherein optical emitter, optical receiver and optical fiber adapter all inlay in the mouth of pipe department of round square body, and be provided with light emission subassembly in the round square body. However, the light receiver of the 40Km 50G PAM4 optical module receives not only received light, but also part of emitted light reflected by the optical module, which is likely to cause optical crosstalk.

The Optical transceiver module of the 150Km BIDI BOSA (Bidirectional Bi-Directional Optical Sub-Assembly) Optical module is currently the Optical transceiver module of a general 40Km 50G PAM4(4level Pulse Amplitude Modulation) Optical module. Because the wavelength interval between the received light and the emitted light of the 150km BIDI BOSA optical module is very small, optical crosstalk is more easily caused, and the crosstalk index of the optical module is lower. However, the requirement of the crosstalk index of the optical module is very high, and therefore, an optical module capable of improving the requirement of the crosstalk index needs to be designed.

SUMMERY OF THE UTILITY MODEL

The application provides an optical module, which improves the requirement of crosstalk indexes.

A light module, comprising:

the optical transceiver comprises a round square tube body, an optical transmitter, an optical receiver and an optical component;

the round and square pipe body is provided with a first pipe orifice and a second pipe orifice;

the light emitter is embedded in the first pipe orifice;

the light receiver is embedded in the second pipe orifice;

the optical assembly is arranged in the inner cavity of the round and square tube body and comprises a baffle and a first optical filter;

the baffle is provided with a through hole, the edge of the baffle is hermetically connected with the inner wall of the round and square pipe body, and the baffle is used for blocking the area except the through hole in the second pipe orifice;

the first optical filter is arranged on the through hole, is adhered to one side of the baffle plate far away from the second pipe orifice and is used for filtering light with wavelengths except the received light;

and the through hole corresponds to the light receiver.

Has the advantages that: an optical module includes an optical transceiver. The optical transceiver comprises a round square tube body, an optical transmitter, an optical receiver and an optical component. The round and square pipe body is provided with a first pipe orifice and a second pipe orifice, the light emitter is embedded in the first pipe orifice, and the light receiver is embedded in the second pipe orifice. The optical assembly is arranged in the inner cavity of the round and square tube body and comprises a baffle and a first optical filter. And the baffle is provided with a through hole, and the edge of the baffle is hermetically connected with the inner wall of the round and square pipe body and is used for blocking an area except the through hole in the second pipe orifice. The first optical filter is arranged on the through hole, is adhered to one side of the baffle plate far away from the second pipe orifice and is used for absorbing light with other wavelengths except the received light. And the through hole corresponds to the light receiver. In the application, the edge of the baffle is hermetically connected with the inner wall of the round and square tube body, namely a blocking layer is arranged between the optical receiver and the optical assembly, so that any wavelength light cannot be emitted into the optical receiver through the baffle; the baffle is provided with a through hole, the first optical filter is arranged on the through hole, and the first optical filter can filter out light with wavelength other than the received light, so that only the received light is transmitted into the light receiver through the through hole. Because the light receiver almost receives only a few emitted lights, even if the wavelength interval between the emitted light and the received light is very small, the light crosstalk is not easy to cause, and the light crosstalk index is further improved. In this application, the baffle not only can be through the through-hole with receiving light and penetrate light receiver, can also block other wavelength light except that receiving light and penetrate light receiver through the sealing connection with the round and square body for light receiver receives almost all receives light and only a few transmission light, further reduces optical crosstalk, improves the crosstalk index.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of an electrical connection relationship of an optical communication terminal;

fig. 2 is a schematic structural diagram of an optical network terminal;

fig. 3 is a schematic structural diagram of an optical module according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of an exploded structure of an optical module according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of an optical transceiver according to an embodiment of the present disclosure;

FIG. 6 is an exploded view of an optical transceiver provided in an embodiment of the present application;

FIG. 7 is a cross-sectional view of an optical transceiver provided in an embodiment of the present application;

FIG. 8 is a cross-sectional view of a round and square tube and an optical assembly according to an embodiment of the present application;

FIG. 9 is an exploded view of an optical assembly according to an embodiment of the present disclosure;

fig. 10 is a schematic view of a first angular structure of a circular-square tube, a baffle, and a first filter according to an embodiment of the present disclosure;

fig. 11 is a second angle structural schematic diagram of the circular-square tube, the baffle, and the first filter according to the embodiment of the present disclosure;

fig. 12 is a schematic view of a first angle structure of a baffle and a first filter according to an embodiment of the present disclosure;

fig. 13 is a schematic diagram of a second angle structure of the baffle and the first filter according to the embodiment of the present disclosure;

FIG. 14 is a schematic structural diagram of a baffle according to an embodiment of the present disclosure;

fig. 15 is a schematic view of a first angular structure of a round-square tube according to an embodiment of the present application;

fig. 16 is a second angle structure schematic diagram of the round and square tube according to the embodiment of the present application.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present disclosure, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

In the optical communication technology, light is used to carry information to be transmitted, and an optical signal carrying the information is transmitted to information processing equipment such as a computer through information transmission equipment such as an optical fiber or an optical waveguide, so that the transmission of the information is completed. Because the optical signal has the passive transmission characteristic when being transmitted through the optical fiber or the optical waveguide, the information transmission with low cost and low loss can be realized. Further, since a signal transmitted by an information transmission device such as an optical fiber or an optical waveguide is an optical signal and a signal that can be recognized and processed by an information processing device such as a computer is an electrical signal, it is necessary to perform interconversion between the electrical signal and the optical signal in order to establish an information connection between the information transmission device such as an optical fiber or an optical waveguide and the information processing device such as a computer.

The optical module realizes the function of interconversion between the optical signal and the electrical signal in the technical field of optical fiber communication. The optical module comprises an optical port and an electrical port, the optical module realizes optical communication with information transmission equipment such as optical fibers or optical waveguides and the like through the optical port, realizes electrical connection with an optical network terminal (such as an optical modem) through the electrical port, and the electrical connection is mainly used for realizing power supply, I2C signal transmission, data signal transmission, grounding and the like; the optical network terminal transmits the electric signal to the computer and other information processing equipment through a network cable or a wireless fidelity (Wi-Fi).

Fig. 1 is a diagram of optical communication system connections according to some embodiments. As shown in fig. 1, the optical communication system mainly includes a remote server 1000, a local information processing device 2000, an optical network terminal 100, an optical module 200, an optical fiber 101, and a network cable 103;

one end of the optical fiber 101 is connected to the remote server 1000, and the other end is connected to the optical network terminal 100 through the optical module 200. The optical fiber itself can support long-distance signal transmission, for example, signal transmission of several kilometers (6 kilometers to 8 kilometers), on the basis of which if a repeater is used, ultra-long-distance transmission can be theoretically achieved. Therefore, in a typical optical communication system, the distance between the remote server 1000 and the optical network terminal 100 may be several kilometers, tens of kilometers, or hundreds of kilometers.

One end of the network cable 103 is connected to the local information processing device 2000, and the other end is connected to the optical network terminal 100. The local information processing apparatus 2000 may be any one or several of the following apparatuses: router, switch, computer, cell-phone, panel computer, TV set etc..

The physical distance between the remote server 1000 and the optical network terminal 100 is greater than the physical distance between the local information processing apparatus 2000 and the optical network terminal 100. The connection between the local information processing device 2000 and the remote server 1000 is completed by the optical fiber 101 and the network cable 103; and the connection between the optical fiber 101 and the network cable 103 is completed by the optical module 200 and the optical network terminal 100.

The optical module 200 includes an optical port and an electrical port. The optical port is configured to connect with the optical fiber 101, so that the optical module 200 establishes a bidirectional optical signal connection with the optical fiber 101; the electrical port is configured to be accessed into the optical network terminal 100, so that the optical module 200 establishes a bidirectional electrical signal connection with the optical network terminal 100. The optical module 200 converts an optical signal and an electrical signal to each other, so that a connection is established between the optical fiber 101 and the optical network terminal 100. For example, an optical signal from the optical fiber 101 is converted into an electrical signal by the optical module 200 and then input to the optical network terminal 100, and an electrical signal from the optical network terminal 100 is converted into an optical signal by the optical module 200 and input to the optical fiber 101.

The optical network terminal 100 includes a housing (housing) having a substantially rectangular parallelepiped shape, and an optical module interface 102 and a network cable interface 104 provided on the housing. The optical module interface 102 is configured to access the optical module 200, so that the optical network terminal 100 establishes a bidirectional electrical signal connection with the optical module 200; the network cable interface 104 is configured to access the network cable 103 such that the optical network terminal 100 establishes a bi-directional electrical signal connection with the network cable 103. The optical module 200 is connected to the network cable 103 via the optical network terminal 100. For example, the optical network terminal 100 transmits an electrical signal from the optical module 200 to the network cable 103, and transmits a signal from the network cable 103 to the optical module 200, so that the optical network terminal 100 can monitor the operation of the optical module 200 as an upper computer of the optical module 200. The upper computer of the Optical module 200 may include an Optical Line Terminal (OLT) and the like in addition to the Optical network Terminal 100.

The remote server 1000 establishes a bidirectional signal transmission channel with the local information processing device 2000 through the optical fiber 101, the optical module 200, the optical network terminal 100, and the network cable 103.

Fig. 2 is a structure diagram of an optical network terminal according to some embodiments, and fig. 2 only shows the structure of the optical module 200 of the optical network terminal 100 in order to clearly show the connection relationship between the optical module 200 and the optical network terminal 100. As shown in fig. 2, the optical network terminal 100 further includes a PCB circuit board 105 disposed in the housing, a cage 106 disposed on a surface of the PCB circuit board 105, and an electrical connector disposed inside the cage 106. The electrical connector is configured to access an electrical port of the optical module 200; the heat sink 107 has a projection such as a fin that increases a heat radiation area.

The optical module 200 is inserted into a cage 106 of the optical network terminal 100, the cage 106 holds the optical module 200, and heat generated by the optical module 200 is conducted to the cage 106 and then diffused by a heat sink 107. After the optical module 200 is inserted into the cage 106, an electrical port of the optical module 200 is connected to an electrical connector inside the cage 106, and thus the optical module 200 establishes a bidirectional electrical signal connection with the optical network terminal 100. Further, the optical port of the optical module 200 is connected to the optical fiber 101, and the optical module 200 establishes bidirectional electrical signal connection with the optical fiber 100.

Fig. 3 is a diagram of an optical module provided according to some embodiments, and fig. 4 is an exploded structural view of an optical module according to some embodiments. As shown in fig. 3 and 4, the optical module 200 includes a housing, a circuit board 300 disposed in the housing, and an optical transceiver;

the shell comprises an upper shell 201 and a lower shell 202, wherein the upper shell 201 is covered on the lower shell 202 to form the shell with two openings 204 and 205; the outer contour of the housing generally appears square.

In some embodiments, the lower housing 202 includes a bottom plate and two lower side plates disposed at both sides of the bottom plate and perpendicular to the bottom plate; the upper housing 201 includes a cover plate, and two upper side plates disposed on two sides of the cover plate and perpendicular to the cover plate, and is combined with the two side plates by two side walls to cover the upper housing 201 on the lower housing 202.

The direction of the connecting line of the two openings 204 and 205 may be the same as the length direction of the optical module 200, or may not be the same as the length direction of the optical module 200. For example, the opening 204 is located at an end (left end in fig. 3) of the optical module 200, and the opening 205 is also located at an end (right end in fig. 3) of the optical module 200. Alternatively, the opening 204 is located at an end of the optical module 200, and the opening 205 is located at a side of the optical module 200. Wherein, the opening 204 is an electrical port, and the gold finger of the circuit board 300 extends out of the electrical port 204 and is inserted into an upper computer (such as the optical network terminal 100); the opening 205 is an optical port configured to receive the external optical fiber 101, so that the optical fiber 101 is connected to an optical transceiver inside the optical module 200.

The upper shell 201 and the lower shell 202 are combined in an assembly mode, so that devices such as the circuit board 300 and the optical transceiver can be conveniently installed in the shells, and the upper shell 201 and the lower shell 202 can form packaging protection for the devices. In addition, when the devices such as the circuit board 300 are assembled, the positioning components, the heat dissipation components and the electromagnetic shielding components of the devices are convenient to arrange, and the automatic implementation production is facilitated.

In some embodiments, the upper housing 201 and the lower housing 202 are generally made of metal materials, which is beneficial to achieve electromagnetic shielding and heat dissipation.

In some embodiments, the optical module 200 further includes an unlocking component 203 located on an outer wall of a housing thereof, and the unlocking component 203 is configured to realize a fixed connection between the optical module 200 and an upper computer or release the fixed connection between the optical module 200 and the upper computer.

Illustratively, the unlocking member 203 is located on the outer wall of the two lower side plates 2022 of the lower housing 202, and includes a snap-fit member that mates with a cage of an upper computer (e.g., the cage 106 of the optical network terminal 100). When the optical module 200 is inserted into the cage of the upper computer, the optical module 200 is fixed in the cage of the upper computer by the engaging member of the unlocking member 203; when the unlocking member 203 is pulled, the engaging member of the unlocking member 203 moves along with the unlocking member, and the connection relationship between the engaging member and the upper computer is changed, so that the engagement relationship between the optical module 200 and the upper computer is released, and the optical module 200 can be drawn out from the cage of the upper computer.

The circuit board 300 includes circuit traces, electronic components (such as capacitors, resistors, triodes, and MOS transistors), and chips (such as MCU, laser driver chip, amplitude limiting amplifier chip, clock data recovery CDR, power management chip, and data processing chip DSP).

The circuit board 300 connects the above devices in the optical module 200 together according to circuit design through circuit routing to implement functions of power supply, electrical signal transmission, grounding, and the like.

The circuit board 300 is generally a rigid circuit board, which can also perform a bearing function due to its relatively rigid material, for example, the rigid circuit board can stably bear a chip; the hard circuit board can also be inserted into an electric connector in the cage of the upper computer, and in some embodiments disclosed in the application, a metal pin/golden finger is formed on the surface of the tail end of one side of the hard circuit board and is used for being connected with the electric connector; these are not easily implemented with flexible circuit boards.

Flexible circuit boards are also used in some optical modules; the flexible circuit board is generally used in combination with the rigid circuit board, and for example, the rigid circuit board may be connected to the optical transceiver device to supplement the rigid circuit board.

Fig. 5 is a schematic structural diagram of an optical transceiver according to an embodiment of the present disclosure. Fig. 6 is an exploded view of an optical transceiver provided in an embodiment of the present application. Fig. 7 is a cross-sectional view of an optical transceiver according to an embodiment of the present disclosure. Fig. 8 is a cross-sectional view of a round and square tube and an optical assembly according to an embodiment of the present application. Fig. 9 is an exploded structural diagram of an optical assembly according to an embodiment of the present disclosure. Fig. 10 is a schematic view of a first angle structure of the circular-square tube, the baffle, and the first filter according to the embodiment of the present disclosure. Fig. 11 is a schematic diagram of a second angular structure of the circular-square tube, the baffle, and the first filter according to the embodiment of the present disclosure. Fig. 12 is a schematic view of a first angle structure of a baffle and a first filter according to an embodiment of the present disclosure. Fig. 13 is a schematic diagram of a second angle structure of the baffle and the first filter according to the embodiment of the present disclosure. Fig. 14 is a schematic structural diagram of a baffle provided in an embodiment of the present application. Fig. 15 is a schematic view of a first angular structure of a circular-square tube according to an embodiment of the present application. Fig. 16 is a second angle structure schematic diagram of the round and square tube according to the embodiment of the present application. As shown in fig. 5-16, in the embodiment of the present application, the optical transceiver 400 includes a round-square tube 401, an optical transmitter 402, an optical receiver 403, an optical module 404, and a fiber adapter 405. In particular, the method comprises the following steps of,

the round and square tube 401 is provided with a first nozzle, a second nozzle and a third nozzle for carrying and fixing the optical transmitter 402, the optical receiver 403, the optical component 404 and the optical fiber adapter 405. Specifically, the light emitter 402 is embedded in the first pipe orifice, the light receiver 403 is embedded in the second pipe orifice, the optical component 404 is disposed in the inner cavity of the round and square pipe 401, and the optical fiber adapter 405 is embedded in the third pipe orifice.

Generally, the first nozzle and the second nozzle are respectively disposed on adjacent side walls of the round and square tube 401, the first nozzle and the third nozzle are respectively disposed on side walls of the round and square tube 401 in the length direction, and the second nozzle is disposed on side walls of the round and square tube 401 in the width direction.

The round and square tube 401 is generally made of metal material, which is beneficial to electromagnetic shielding and heat dissipation. Specifically, the light emitter 402 is in heat conduction contact with the round and square tube 401 through the first pipe opening, and the light receiver 403 is in heat conduction contact with the round and square tube 401 through the second pipe opening. The light emitter 402 and the light receiver 403 are directly press-fitted into the round and square tube body 401, and the round and square tube body 401 is in contact with the light emitter 402 and the light receiver 403, respectively, directly or through a heat transfer medium. Thus, the round and square tube 401 can be used for heat dissipation of the light emitter 402 and the light receiver 403, and heat dissipation effect of the light emitter 402 and the light receiver 403 is ensured.

The optical transmitter 402, connected to the circuit board 300 via a flexible circuit board, is provided with an optical transmitting chip therein for transmitting an optical signal. Specifically, the light emitter 402 includes a tube seat and a cap, the cap is disposed on the tube seat, and the cap and the tube seat enclose a cavity. The stem is provided with a light emitting chip and a first lens. The optical signal emitted by the optical transmitting chip is collimated by the first lens, then enters the optical component 404, and is coupled into the optical fiber adapter 405 after being converged by the optical component 404.

The optical receiver 403 is connected to the circuit board 300 through a flexible circuit board, and a light receiving chip is disposed in the optical receiver for receiving an optical signal. Specifically, the optical receiver 403 includes a tube seat and a tube cap, the tube cap is disposed on the tube seat, and the tube cap and the tube seat enclose a cavity. The stem is provided with a light receiving chip and a second lens. The optical signal emitted by the optical fiber adapter 405 is reflected to the second lens in the optical receiver 403 through the optical component 404, and is converged to the optical receiving chip through the second lens.

The optical component 404, disposed in the inner cavity of the round and square tube 401, includes a first optical filter 4041, a reflective sheet 4042, a second optical filter 4043, a third lens 4044, a baffle 4045, and an isolator 4046, and is configured to adjust the optical signal emitted by the optical transmitter 402 and adjust the optical signal incident on the optical receiver 403.

The optical assembly 404 is disposed in the inner cavity of the round tube 401. Specifically, the upper surface of round and square body 401 is inwards sunken to be provided with first backup pad 4011, second backup pad 4012, third backup pad 4013 and fourth backup pad 4014 in proper order, and third backup pad 4013 is used for placing second light filter 4043, and fourth backup pad 4014 is used for placing reflector plate 4042, and first backup pad 4011's downside is used for placing third lens 4044. To place the third lens 4044 on the underside of the first support plate 4011, the first support plate 4011 can be hollowed out to form a cavity in which the third lens 4044 is placed. Since the second support plate 4012 is located at a position where the optical assembly 404 is not required to be placed, the second support plate 4012 is recessed far lower than the third support plate 4013 and the fourth support plate 4014 by a recess distance lower than or equal to that of the first support plate 4011. However, in order to conveniently put the third lens 4044, the second optical filter 4043, and the reflective sheet 4042 in the corresponding positions, the degree of recess of the second support plate 4012 is greater than that of the first support plate 4011, but less than that of the third support plate 4013 and the fourth support plate 4014.

A first optical filter 4041 is disposed between the reflective sheet 4042 and the baffle 4045, and is configured to filter out light of wavelengths other than the received light. Specifically, the first optical filter 4041 is disposed right below the optical receiver 403, and is adhered to one side of the baffle 4045 away from the second nozzle (i.e., the lower side of the baffle 4045), that is, the first optical filter 4041 is located between the reflective sheet 4042 and the baffle 4045.

The first filter 4041 is a 0 ° filter. A 0 filter refers to a filter in which the incident light makes an angle of 0 ° with the normal to the filter. I.e. the incident light is incident perpendicularly to the 0 deg. filter.

The first filter 4041 is coated with a film so that the transmittance of received light is 100%, i.e., the reflectance of emitted light is 100%. When the incident light is emitted light, the incident light vertically enters the first optical filter 4041, and the incident light is reflected back in the original path; when the incident light is received light, the incident light is incident perpendicularly to the first filter 4041, and the incident light is transmitted completely.

The reflective sheet 4042 is positioned between the second optical filter 4043 and the third lens 4044, and is positioned below the first optical filter 4041, so that the reflected light is incident perpendicularly on the first optical filter 4041. The received light or part of the emitted light is reflected by the reflective sheet 4042 and then vertically incident into the first optical filter 4041.

The second optical filter 4043 is located on a side of the round and square tube 401 close to the light emitter 402, and is configured to transmit the emitted light to the third lens 4044, and reflect the received light or part of the emitted light collimated by the third lens 4044 to the reflection sheet 4042. Specifically, the emitted light emitted by the light emitter 402 is transmitted into the third lens 4044 through the second optical filter 4043, and the received light or part of the emitted light collimated by the third lens 4044 is reflected to the reflective sheet 4042 through the second optical filter 4043.

A third lens 4044 is disposed on a side of the round-square tube 401 near the fiber adapter 405, and is used for coupling the emitted light into the fiber adapter and collimating the emitted light or the received light into parallel light. Specifically, the emitted light is coupled into the optical fiber adapter through the third lens 4044, and the received light or part of the emitted light is collimated into parallel light through the third lens 4044.

And the edge of the baffle 4045 is hermetically connected with the inner wall of the round and square pipe body 401 and is used for blocking the area except the through hole in the second pipe orifice. Specifically, the edge of the baffle 4045 is connected to the inner wall of the round-square tube 401 in a sealing manner, which is equivalent to a blocking layer disposed between the light receiver 403 and the optical component 404, so that any wavelength light cannot enter the light receiver 403 through the baffle 4045.

The baffle 4045 includes a baffle body 40451 and a restraining protrusion 40452. In particular, the method comprises the following steps of,

baffle body 40451, the center is provided with through-hole 40453, keeps away from the one side of second mouth of pipe direction and is connected with first backup pad 4011.

Through hole 40453 corresponds to light receiver 403, through which part of both emitted light and received light can be incident into light receiver 403.

The first optical filter 4041 is disposed on the through hole 40453, and the first optical filter 4041 is used to filter out light of wavelengths other than the received light, so that only the received light enters the optical receiver 403 through the through hole 40453. Wherein the edge of the through hole 40453 is located on the first filter 4041.

Although almost all of the light cannot enter the light receiver 403 through the baffle 4045 and the received light enters the light receiver 403 through the through hole 40453, part of the emitted light enters the light receiver 403. In order to reduce the emission light from being emitted to the light receiver 403, the surface of the baffle 4045 is provided with an absorption layer, and the edge of the baffle 4045 is hermetically connected with the inner wall of the round and square tube body through black glue. The absorbing layer is a structural layer obtained by blackening the baffle 4045, and can absorb light of a wavelength other than received light. The black glue can seal the edge of the baffle 4045 and the inner wall of the round and square tube body tightly, so that the emission light is further reduced from being emitted into the receiver 403; and light with other wavelengths besides the received light can be absorbed, so that the emitted light is further reduced to enter the light receiver 403, and the optical crosstalk is reduced.

Spacing arch 40452, by keeping away from the one side extension of second mouth of pipe direction in baffle body 40451 and obtain, with through-hole 40453 contactless, be located the one side that is close to the light emitter in the pipe body of circle square, be connected with second backup pad 4012. Specifically, a limit protrusion 40452 extends from a partial region of the lower side of the flap body 40451. The stopper protrusion 40452 is away from the through hole 40453 and does not contact the through hole 40453. The limiting protrusion 40452 is located on the side of the round and square tube 401 close to the light emitter 402. The limiting protrusion 40452 is in contact with the second supporting board 4012, and may also be in contact with the second optical filter 4043.

This spacing arch 40452's difference in height equals the difference in height of first backup pad 4011 and second backup pad 4012, can make baffle 4045 and first backup pad 4011, second backup pad 4012 in close contact with, increases baffle 4045 and first backup pad 4011, second backup pad 4012's area of contact, further reduces the light that goes out except that receive light and gets into optical receiver 403.

The isolator 4046 is used not only to prevent the emitted light emitted from the light emitter from returning to the light emitter, but also to prevent the received light from entering the light emitter. Due to the presence of the isolator 4046, received light cannot enter the optical transmitter, avoiding optical crosstalk within the optical transmitter.

A fiber optic adapter 405 for connecting optical fibers. Specifically, the optical transmitter 402 is embedded in a first pipe orifice of the round and square pipe body, the optical receiver 403 is embedded in a second pipe orifice of the round and square pipe body, the optical fiber adapter 405 is embedded in a third pipe orifice of the round and square pipe body, and the optical transmitter 402 and the optical receiver 403 are respectively connected with the optical fiber adapter 405 in an optical manner. The optical signal sent by the optical transmitter 402 and the light received by the optical receiver 403 are transmitted through the same optical fiber in the optical fiber adapter 405, that is, the same optical fiber in the optical fiber adapter 405 is a transmission channel for the light to enter and exit from the optical transceiver, and the optical transceiver realizes a single-fiber bidirectional optical transmission mode.

The fiber optic adapter 405 includes a package 4051 and a fiber stub 4052 disposed in the package 4051. The optical fiber core insert 4051 can be formed by wrapping an optical fiber by a ceramic material, the optical fiber is used for transmitting light, the ceramic has higher processing precision, high-precision position alignment can be realized, the optical fiber and the ceramic are combined into the optical fiber core insert, and the optical fiber is fixed by fixing the ceramic. The ceramic material limits the fixing direction of the optical fiber in the optical fiber ferrule, generally, the ceramic is processed into a cylinder, a linear through hole is arranged in the center of the ceramic cylinder, and the optical fiber is inserted into the through hole of the ceramic cylinder to realize fixing, so that the optical fiber is fixed in the ceramic body straightly; in the optical fiber ferrule, the axial direction of the optical fiber is parallel to the axial direction of the optical fiber ferrule 4052.

Light is emitted into the optical fiber through air, and the light cannot be refracted when perpendicularly emitted into the end face of the optical fiber, the angle relation between the light emitting direction of the laser chip and the optical fiber insertion core is easily controlled by adopting the mode, but the reflected light can return along the original light path through the perpendicular incidence, and the returned reflected light is emitted into the baffle plate through the second optical filter and the reflecting sheet;

in order to prevent the reflected light from returning along the original optical path, the optical path is designed to enable the light to be incident on the end face of the optical fiber in a non-vertical mode; in order to realize the non-vertical incidence of light on the end face of the optical fiber, the end face of the optical fiber is ground into an inclined plane, specifically, the optical fiber is wrapped in ceramic to form an optical fiber ferrule, the end face of the optical fiber ferrule is ground into the inclined plane, and the end face of the optical fiber in the optical fiber ferrule is then inclined.

Specifically, the optical fiber ferrule is formed by wrapping an optical fiber by a ceramic cylinder, the axial direction of the optical fiber ferrule is the same as that of the optical fiber, and the light incident surface of the optical fiber ferrule is ground into an inclined surface, namely the light incident surface of the optical fiber ferrule is ground into the same inclined surface; the optical fiber consists of a core layer and a cladding layer with different refractive indexes, and light is totally reflected at an interface of the core layer and the cladding layer so as to be restrained to be transmitted in the core layer.

The end face of the optical fiber inserting core 4052 is plated with an antireflection film.

And the antireflection film is a transparent dielectric film and is used for reducing reflection loss. Specifically, incident light is transmitted to the end face of the optical fiber through the anti-reflection, so that light reflection is reduced, light original path return is reduced, and light return loss is effectively reduced.

Receiving light:

and the received light received by the optical fiber inserting core of the optical fiber adapter is collimated by the third lens, reflected by the second optical filter and the reflector plate and then vertically injected into the first optical filter to be coupled to the optical receiver. Although part of the received light is transmitted to the light emitter through the second filter, an isolator is arranged in the light emitter, so that part of the received light emitted to the light emitter cannot enter the light emitter, and light crosstalk cannot be caused.

Light emission:

and the emission light emitted by the light emitter is transmitted to the third collimating lens through the second optical filter and is coupled to the end face of the optical fiber inserting core of the optical fiber adapter through the third collimating lens. Part of the emitted light is reflected at the end face of the optical fiber ferrule, collimated along the third collimating lens, reflected by the second optical filter and reflected by the reflecting sheet and then vertically emitted into the first optical filter. However, since the first optical filter is used for filtering all light except the received light, the edges of the through holes are all located on the first optical filter, so that the emitted light cannot enter the light receiver through the through holes. Due to the existence of the baffle, the emitted light can hardly enter the light receiver, the light crosstalk is further reduced, and the crosstalk index is improved.

An optical module includes an optical transceiver. The optical transceiver comprises a round square tube body, an optical transmitter, an optical receiver and an optical component. The round and square pipe body is provided with a first pipe orifice and a second pipe orifice, the light emitter is embedded in the first pipe orifice, and the light receiver is embedded in the second pipe orifice. The optical assembly is arranged in the inner cavity of the round and square tube body and comprises a baffle and a first optical filter. And the baffle is provided with a through hole, and the edge of the baffle is hermetically connected with the inner wall of the round and square pipe body and is used for blocking an area except the through hole in the second pipe orifice. The first optical filter is arranged on the through hole, is adhered to one side of the baffle plate far away from the second pipe orifice and is used for absorbing light with other wavelengths except the received light. And the through hole corresponds to the light receiver. In the application, the edge of the baffle is hermetically connected with the inner wall of the round and square tube body, namely a blocking layer is arranged between the optical receiver and the optical assembly, so that any wavelength light cannot be emitted into the optical receiver through the baffle; the baffle is provided with a through hole, the first optical filter is arranged on the through hole, and the first optical filter can filter out light with wavelength other than the received light, so that only the received light is transmitted into the light receiver through the through hole. Because the light receiver almost receives only a few emitted lights, even if the wavelength interval between the emitted light and the received light is very small, the light crosstalk is not easy to cause, and the light crosstalk index is further improved. In this application, the baffle not only can be through the through-hole with receiving light and penetrate light receiver, can also block other wavelength light except that receiving light and penetrate light receiver through the sealing connection with the round and square body for light receiver receives almost all receives light and only a few transmission light, further reduces optical crosstalk, improves the crosstalk index.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solutions of the present disclosure, not to limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present disclosure.

Claims (8)

1. A light module, comprising:

the optical transceiver comprises a round square tube body, an optical transmitter, an optical receiver and an optical component;

the round and square pipe body is provided with a first pipe orifice and a second pipe orifice;

the light emitter is embedded in the first pipe orifice;

the optical receiver is embedded in the second pipe orifice;

the optical assembly is arranged in the inner cavity of the round and square tube body and comprises a baffle and a first optical filter;

the baffle is provided with a through hole, the edge of the baffle is hermetically connected with the inner wall of the round and square pipe body, and the baffle is used for blocking the area except the through hole in the second pipe orifice;

the first optical filter is arranged on the through hole, is adhered to one side of the baffle far away from the second pipe orifice and is used for filtering out light with wavelengths except the received light;

the through hole corresponds to the light receiver.

2. The light module of claim 1, wherein the baffle surface is provided with an absorbing layer;

the absorption layer is used for absorbing light with wavelengths other than the received light.

3. The optical module of claim 1, wherein the edge of the baffle is hermetically connected to the inner wall of the round and square tube by black glue, wherein the black glue can absorb light with wavelength other than the received light.

4. The optical transceiver of claim 1, further comprising a fiber optic adapter;

the optical fiber adapter is embedded in the third pipe orifice of the round and square pipe body and comprises an optical fiber inserting core;

the end face of the optical fiber ferrule is an inclined plane.

5. The optical module of claim 4, wherein the end face of the optical fiber ferrule is coated with an antireflection film.

6. The optical module of claim 2, wherein the bezel comprises a bezel body and a stop protrusion;

the center of the baffle body is provided with the through hole, and one side of the baffle body, which is far away from the direction of the second pipe orifice, is connected with the first supporting plate;

spacing arch, by keep away from in the baffle body one side of second mouth of pipe direction extends and obtains, with the through-hole contactless is located be close to in the round square body one side of light emitter is connected with the second backup pad, wherein, first backup pad and second backup pad are formed by the upper surface of round square body is inwards sunken, the sunken degree of second backup pad is greater than the sunken degree of first backup pad.

7. The optical module of claim 4, wherein the optical assembly further comprises a second filter, a reflector sheet, and a third lens, wherein:

the second optical filter is positioned on one side, close to the light emitter, of the round and square tube body and used for transmitting the emitted light into the third lens and reflecting the received light or part of the emitted light collimated by the third lens to the reflecting sheet;

the reflecting sheet is positioned below the first optical filter and between the second optical filter and the third lens so as to enable the reflected light to vertically enter the first optical filter;

and the third lens is positioned on one side of the round and square tube body close to the optical fiber adapter and used for coupling the emitted light into the optical fiber adapter and collimating the emitted light or the received light into parallel light.

8. The optical module of claim 1, wherein an isolator is disposed within the transmitter;

the isolator is used for preventing the emitted light emitted by the light emitter from returning to the light emitter.

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