WO2020224644A1

WO2020224644A1 - Optical module

Info

Publication number: WO2020224644A1
Application number: PCT/CN2020/089213
Authority: WO
Inventors: 卢启铭; 李丹
Original assignee: 青岛海信宽带多媒体技术有限公司
Priority date: 2019-05-09
Filing date: 2020-05-08
Publication date: 2020-11-12
Also published as: CN111913258A

Abstract

An optical module (200), relating to the field of optical fiber communications. A transmitter optical subassembly cavity (402) and an optical fiber socket are respectively fixed on the surface of a lower housing (202), so that a distance between a transmitter optical subassembly (400) and an optical fiber socket (502) is relatively fixed; one end of an optical fiber adapter (600) extends into a through hole (406) of the transmitter optical subassembly (400), and the other end is connected to the optical fiber socket (502) by means of an optical fiber (501), so that the transmitter optical subassembly (400) is connected to the optical fiber socket (502) by means of the optical fiber (501), and the optical fiber adapter (600) can move in the through hole (406) in an assembly process; the size of the optical fiber (501) is difficult to accurately match in mass production, rendering that a problem that the optical fiber (501) between the transmitter optical subassembly (400) and the optical fiber socket (502) is too long or too short is likely to occur; the distance between the transmitter optical subassembly (400) and the optical fiber socket (502) can be adapted by moving the optical fiber adapter (600) back and forth in the through hole (406).

Description

An optical module

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office, the application number is 201910384906.0, and the invention title is "a kind of optical module" on May 9, 2019, the entire content of which is incorporated into this application by reference.

Technical field

This application relates to the field of optical communication technology, and in particular to an optical module.

Background technique

The optical module realizes the function of photoelectric conversion in the field of optical fiber communication technology. The intensity of the optical signal input from the optical module to the external optical fiber directly affects the quality of optical fiber communication. The light emitting part of some optical modules is packaged in a micro-optical form, that is, the light emitted by the optical chip enters the air, and the light emitted by the optical chip is coupled to the optical fiber adapter after the lens and the optical fiber adapter are set on the optical path. The optical fiber adapter is connected to the optical fiber. The efficiency of coupling the light emitted by the optical chip into the optical fiber affects the optical power of the optical signal, and the transmission loss of the light in the optical fiber also affects the optical power of the optical signal.

Summary of the invention

The embodiment of the application provides an optical module, which includes an upper housing, a lower housing, a light emission sub-module cavity, an optical fiber adapter, an optical fiber, and an optical fiber socket respectively located between the upper and lower housings; the optical emission sub-module The cavity and the optical fiber socket are respectively fixed on the surface of the lower shell; the light emitting sub-module cavity includes a light emitting chip and a lens, and the side wall of the light emitting submodule cavity has a through hole; the light emitted by the light emitting chip is injected into the optical fiber adapter through the lens in.

Description of the drawings

In order to explain the technical solution of the present application more clearly, the following will briefly introduce the drawings needed in the embodiments. Obviously, for those of ordinary skill in the art, without paying creative labor, Other drawings can be obtained from these drawings.

Figure 1 is a schematic diagram of the connection relationship of an optical communication terminal;

Figure 2 is a schematic diagram of the structure of an optical network unit;

FIG. 3 is a schematic structural diagram of an optical module provided by an embodiment of the application;

4 is an exploded schematic diagram of an optical module structure provided by an embodiment of the application;

FIG. 5 is a cross-sectional view of an optical module structure provided by an embodiment of the present application;

6 is a schematic diagram of the assembly structure of the optical transmission sub-module and the optical fiber plug according to the embodiment of the application;

FIG. 7 is an exploded view of the optical emission sub-module structure provided by an embodiment of the application;

8 is a schematic diagram of an assembly cross-sectional exploded structure diagram of a light emitting sub-module and an optical fiber adapter provided by an embodiment of the application;

Figure 9 is a schematic diagram of an exploded structure of an optical fiber adapter provided by an embodiment of the application;

10 is a schematic diagram of a cross-sectional structure of an optical fiber adapter provided by an embodiment of the application;

FIG. 11 is a schematic diagram of an assembly cross-sectional view of another optical emission sub-module and optical fiber adapter provided by an embodiment of the application;

FIG. 12 is an exploded schematic diagram of an assembly cross-sectional view of another optical emission sub-module and optical fiber adapter provided by an embodiment of the application;

FIG. 13 is an exploded schematic diagram 1 of another optical emission sub-module and optical fiber adapter provided by an embodiment of the application;

Fig. 14 is an exploded schematic diagram of another optical emission sub-module and optical fiber adapter provided by an embodiment of the application; Fig. 2;

15 is an exploded cross-sectional schematic diagram of another optical fiber adapter provided by an embodiment of the application;

16 is a schematic diagram of a partial assembly cross-section of another optical emission sub-module and optical fiber adapter provided by an embodiment of the application;

FIG. 17A is a schematic diagram of the optical path structure of a light emission sub-module provided by the prior art;

FIG. 17B is a simulation diagram of the coupling efficiency of the optical path structure in FIG. 17A;

18A is a schematic diagram of the optical path structure of the optical emission sub-module provided by the prior art;

18B is a simulation diagram of the coupling efficiency of the optical path structure in FIG. 18A;

18C is a simulation diagram of the coupling efficiency of the optical axis entering the inclined fiber ferrule through the center of the focusing lens;

19A is a schematic diagram of the optical path structure of the optical emission submodule provided by an embodiment of the application;

Figure 19B is a simulation diagram of the coupling efficiency of the optical path structure in Figure 19A

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

Optical communication realizes the transmission of signals using two different carriers, electric and optical. Optical fiber communication uses information-carrying optical signals to be transmitted in optical waveguides, and the passive transmission characteristics of light in optical fibers and other optical waveguides can achieve low-cost, low-loss information transmission; while computers and other information processing equipment use electrical signals. This requires the mutual conversion of electrical and optical signals in optical fiber communication systems.

Figure 1 is a schematic diagram of the connection relationship of an optical communication terminal. As shown in Figure 1, the connection of an optical communication terminal mainly includes an optical network unit 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, and one end of the network cable 103 is connected to the local information processing equipment. The connection between the local information processing equipment and the remote server is completed by the connection of the optical fiber 101 and the network cable 103; and the connection between the optical fiber 101 and the network cable 103 is The optical network unit 100 with the optical module 200 is completed.

The optical port of the optical module 200 is connected to the optical fiber 101, and a bidirectional optical signal connection is established with the optical fiber;

The electrical port of the optical module 200 is connected to the optical network unit 100 to establish a two-way electrical signal connection with the optical network unit;

The optical module realizes the mutual conversion between optical signals and electrical signals, thereby realizing the establishment of a connection between the optical fiber 101 and the optical network unit 100;

Specifically, the optical signal from the optical fiber is converted into an electrical signal by the optical module and then input into the optical network unit 100, and the electrical signal from the optical network unit 100 is converted into an optical signal by the optical module and input into the optical fiber 101. The optical module 200 is a tool for realizing the mutual conversion of photoelectric signals and does not have the function of processing data. In the above photoelectric conversion process, the information carrier is converted between light and electricity, but the information itself has not changed.

The optical network unit 100 has an optical module interface 102 for connecting to the optical module 200 and establishing a bidirectional electrical signal connection with the optical module 200;

The optical network unit has a network cable interface 104 for connecting to the network cable 103 and establishing a two-way electrical signal connection with the network cable 103;

The optical module 200 and the network cable 103 establish a connection through an optical network unit;

Specifically, the optical network unit transfers the signal from the optical module to the network cable, and transfers the signal from the network cable to the optical module, and the optical network unit functions as the upper computer of the optical module to monitor the operation of the optical module.

So far, the remote server establishes a bidirectional signal transmission channel with the local information processing equipment through the optical fiber 101, the optical module 200, the optical network unit 100, and the network cable 103 in sequence.

Common information processing equipment includes routers, switches, electronic computers, etc.;

The optical network unit is the upper computer of the optical module, which provides data signals to the optical module and receives data signals from the optical module. The common optical module upper computer also has an optical line terminal OLT.

Figure 2 is a schematic diagram of the optical network unit structure. As shown in Figure 2, the optical network unit 100 has a circuit board 105, and a cage 106 is provided on the surface of the circuit board 105; an electrical connector connected to the circuit board 105 is provided in the cage 106 for accessing golden fingers, etc. Optical module electrical port; a radiator 107 is provided on the cage 106, and the radiator 107 has a convex structure such as fins to increase the heat dissipation area.

The optical module 200 is inserted into the optical network unit 100. Specifically, the electrical port of the optical module is inserted into the electrical connector in the cage 106, and the optical port of the optical module is connected to the optical fiber 101.

The cage 106 is located on the circuit board 105 of the optical network unit 100, and wraps the electrical connectors on the circuit board 105 in the cage; the optical module is inserted into the cage, and the optical module is fixed by the cage, and the heat generated by the optical module is conducted through the optical module housing Give the cage, and finally spread through the radiator 107 on the cage.

FIG. 3 is a schematic structural diagram of an optical module provided by an embodiment of the application, and FIG. 4 is an exploded schematic diagram of an optical module structure provided by an embodiment of the application. As shown in FIG. 3 and FIG. 4, the optical module provided by the embodiment of the application is 200 includes an upper housing 201, a lower housing 202, an unlocking handle 203, a circuit board 300, a light emitting sub-module 400, a light receiving sub-module 500 and an optical fiber socket 502.

The upper shell 201 and the lower shell 202 form a wrapping cavity with two ports, which can be two ports (204, 205) in the same direction, or two ports in different directions; one of the ports is The electrical port 204 is used to plug into the upper computer such as the optical network unit; the other port is the optical port 205, which is used to connect the external optical fiber 101; the circuit board 300, the optical transmitting sub-module 400 and the optical receiving sub-module 500 are located on the upper , In the wrapping cavity formed by the lower shell.

The upper shell and the lower shell are generally made of metal materials, which is conducive to electromagnetic shielding and heat dissipation; the assembly method of the upper shell and the lower shell is used to facilitate the installation of circuit boards and other components into the shell. Generally, the optical module will not be installed. The housing is made into an integrated structure, so that when assembling circuit boards and other devices, the positioning components, heat dissipation and electromagnetic shielding structures are not easy to install, which is not conducive to production automation.

The unlocking handle 203 is located on the outer wall of the wrapping cavity/lower housing 202. Pulling the end of the unlocking handle can make the unlocking handle move relative to the outer wall surface; when the optical module is inserted into the upper computer, the unlocking handle 203 is engaged with the cage 106, thereby holding the optical module It is fixed in the upper computer; the locking relationship between the optical module 200 and the cage 106 is released by pulling the unlocking handle, so that the optical module can be withdrawn from the upper computer.

The circuit board 300 is located in an enveloping cavity formed by an upper shell and a casing. The circuit board 300 is electrically connected to the light emitting sub-module 400 and the light receiving sub-module 500 respectively. The circuit board is provided with electrical devices such as chips, capacitors, and resistors. Choose the corresponding chip according to the needs of the product. Common chips include microprocessor MCU, clock data recovery chip CDR, laser drive chip, transimpedance amplifier TIA chip, limiting amplifier LA chip, power management chip, etc.; among them, transimpedance amplifier and The light detection chip is closely related. Some products will package the transimpedance amplifier and the light detection chip together, such as packaged in the same TO package or the same shell; the light detection chip and the transimpedance The impedance amplifier is arranged on the circuit board.

The chip on the circuit board 300 can be a multifunctional integrated chip, for example, a laser driver chip and an MCU chip are fused into one chip, or a laser driver chip, a limiting amplifier chip and an MCU can be fused into one chip. The chip is an integrated circuit , But the function of each circuit has not disappeared because of the collection, but the appearance of the circuit has changed, and the circuit form is still present in the chip. Therefore, when the circuit board is equipped with three independent chips, the MCU, the laser driver chip, and the limiting amplifier chip, this is equivalent to the arrangement of a single chip with three functions on the circuit board 300.

The end surface of the circuit board 300 has golden fingers, which are composed of independent pins. The circuit board is inserted into the electrical connector in the cage, and the golden fingers are conductively connected to the snap-fit springs in the electrical connector. ; Gold fingers can be set on only one side surface of the circuit board. Considering the large number of pins, gold fingers are generally set on the lower surface of the circuit board; the gold fingers are used to establish electrical connections with the host computer. The connection can be power supply, ground, I2C signal, communication data signal, etc.

The optical module also includes an optical emission sub-module and an optical receiving sub-module. The optical emission sub-module and the optical receiving sub-module can be collectively referred to as an optical sub-module. As shown in FIG. 4, the optical module provided by the embodiment of the present application includes a light emitting sub-module 400 and a light receiving sub-module 500. The light emitting sub-module 400 is located on the edge of the circuit board 300. The light emitting sub-module 400 and the light receiving sub-module 500 are The staggered arrangement on the surface of the circuit board 300 is beneficial to achieve a better electromagnetic shielding effect.

The light emitting submodule 400 is arranged on the surface of the circuit board 300. In another common packaging method, the light emitting submodule is physically separated from the circuit board and electrically connected through a flexible board; the light receiving submodule 500 is arranged on the surface of the circuit board 300 In another common packaging method, the light receiving sub-module is physically separated from the circuit board, and the electrical connection is realized through a flexible board.

The light emitting sub-module is located in a wrapping cavity formed by the upper and lower shells. As shown in FIG. 4, the circuit board 300 is provided with a notch 301 for placing the light emitting sub-module; the notch 301 can be set in the middle of the circuit board, It can also be arranged on the edge of the circuit board; the light emission sub-module is embedded in the gap 301 of the circuit board, so that the circuit board can be inserted into the light emission sub-module, and it is also convenient to fix the light emission sub-module and the circuit board together. .

FIG. 5 is a cross-sectional view of an optical module structure provided by an embodiment of the present application. As shown in FIG. 5, the optical module provided by the embodiment of the present application includes a lower housing 202, a circuit board 300, a light transmitting sub-module 400, a light receiving sub-module 500 and an optical fiber socket 502, a light transmitting sub-module 400 and a light receiving sub-module 500 is located on the circuit board 300, and the optical fiber socket 502 is connected to the light transmitting sub-module 400 and the light receiving sub-module 500 through the optical fiber 501; the lower housing 202 is used to carry the circuit board 300 and the optical fiber socket 502, and the circuit board 300 carries the light transmitting sub-module Module 400 and light receiving sub-module 500.

Specifically, the lower housing 202 has a card slot 206 with a gap 206a in the card slot 206, and the card slot may be formed by a convex surface of the lower housing;

The optical fiber socket 502 includes a main body 502a and a protrusion 502b. The protrusion 502b is located on the surface of the main body 502a, and the protrusion is convex relative to the main body;

The optical fiber socket 502 is assembled and fixed with the groove 206 on the lower housing 202; specifically, the optical fiber socket is fixed on the lower housing by placing the protrusion 502b in the gap 206a of the groove 206;

The card slot divides the lower housing into two areas, and the circuit board is arranged in one of the areas. A convex column is formed on the surface of the lower housing in this area to fix the circuit board; the light emitting sub-module and the circuit board are fixed together by fixing The circuit board realizes that the light emitting sub-module is fixed on the lower casing; of course, the light emitting sub-module can also be directly fixed on the lower casing without indirect fixing through the circuit board;

The optical fiber socket is arranged in the other area, and the external optical fiber plug extends into the other area to be connected to the optical fiber socket. Therefore, the circuit board and the optical fiber socket are respectively fixed on the lower housing, that is, the positions of the light emitting sub-module and the optical fiber socket are relatively fixed. Therefore, the optical fiber 501 connecting the light emitting sub-module and the optical fiber socket needs to have a specific size.

FIG. 6 is a schematic diagram of the assembly structure of the optical transmission sub-module and the optical fiber plug according to the embodiment of the application. As shown in FIG. 6, the optical transmission sub-module 400 is connected to the optical fiber socket 502 through the optical fiber adapter 600 and the optical fiber 501 in sequence. One end of the optical fiber 501 is connected to the optical fiber adapter 600, and the other end is connected to the optical fiber socket 502;

The optical fiber adapter 600 is used for inserting into the light transmitting sub-module to receive the light converged by the optical lens 407; the optical fiber socket 502 is connected to the optical fiber 501 and the optical fiber plug outside the optical module respectively, and is used to realize the connection between the optical module and the optical module. Optical connection, so that the light forming the light emission sub-module is connected to the optical fiber through the optical fiber adapter, is transmitted from the optical fiber to the optical fiber plug 502, and is transmitted to the outside of the optical module through the optical fiber socket.

FIG. 7 is an exploded view of the structure of the optical emission sub-module provided by an embodiment of the application. The light emission sub-module provided by the embodiment of the present application is provided with a laser assembly 404, and the laser assembly 404 includes a laser chip 404a, a collimating lens 404b, a metalized ceramic 404c, and a semiconductor cooler 404d. The common light emitting chip of the optical module is a laser chip. The laser chip 404a is placed on the surface of the metalized ceramic 404c. The surface of the metalized ceramic forms a circuit pattern, which can supply power to the laser chip. At the same time, the metalized ceramic has better thermal conductivity. As the heat sink of the laser chip to dissipate heat; laser has better single-wavelength characteristics and better wavelength tuning characteristics as the preferred light source for optical modules and even optical fiber transmission; other types of light such as LED light, etc., common optical communication systems generally do not Will be used. Even if this light source is used in a special optical communication system, the characteristics of the light source and chip structure are quite different from the laser, which makes the optical module using laser and the optical module using other light sources have a large technical difference Those skilled in the art generally do not think that these two types of optical modules can provide technical inspiration to each other.

The function of the optical lens is to converge the light, and the light emitted from the light emitting chip is in a divergent state. In order to facilitate subsequent optical path design and light coupling into the optical fiber, it is necessary to perform convergence processing. The common convergence is to converge divergent light into parallel light, and converge divergent light and parallel light into convergent light. Fig. 7 shows a collimating lens 404b and a focusing lens 407. The collimating lens 404b is arranged on the light path of the laser chip to converge the divergent light of the laser chip into parallel light; the focusing lens 407 is arranged close to the optical fiber The side of the adapter 600 converges the parallel light into the optical fiber adapter 600.

According to the transmission design and the characteristics of the laser chip, the light emission sub-module may also include a semiconductor cooler TEC404d. The TEC is directly or indirectly arranged on the bottom surface of the cavity of the light emission sub-module, and the metalized ceramic is arranged on the surface of the TEC. The TEC is used to balance heat To maintain the set working temperature of the laser chip.

The light emission sub-module has a packaging structure to package laser chips, etc. The existing packaging structures include coaxial packaging TO-CAN, silicon optical packaging, chip-on-board lens component packaging COB-LENS, and micro-optics XMD packaging. Packaging is also divided into airtight packaging and non-airtight packaging. On the one hand, the package provides a stable and reliable working environment for the laser chip, and on the other hand forms an external electrical connection and light output.

According to the product design and process, the optical module will use different packages to make the light emitting sub-module; the laser chip has vertical cavity surface to emit light, and there is also edge light. The different direction of the laser chip's light output will also affect the choice of package form; various packages There are obvious technical differences between them. Both the structure and the process are different technical directions. Those skilled in the art know that although the goals achieved by different packages have certain similarities, different packages belong to different technical routes. There will be no mutual technical enlightenment between packaging technologies.

As shown in FIG. 6 and FIG. 7, the light emitting sub-module provided by the embodiment of the present application includes a cover plate 401 and a cavity 402. The cover plate 401 covers the cavity 402 from above. One side wall of the cavity 402 has an opening 403. , Used to insert the circuit board 300, the circuit board is fixed with the lower housing of the optical module; a laser assembly 404 is provided in the cavity, and the circuit board extending into the cavity is electrically connected with the laser assembly 404, and the laser assembly has a laser chip , Collimating lens and other components to form collimated light out; the cavity is provided with an optical multiplexing component 405, which receives multiple beams of light from the laser component 404 and combines the multiple beams into one beam of light. The light includes light of different wavelengths; the other side wall of the cavity has a through hole 406, and a beam of light combined by the optical multiplexing component 405 enters the through hole 406; between the through hole 406 and the optical multiplexing component 405 A focusing lens 407 can also be set to converge the light through the focusing lens to facilitate subsequent coupling of light; the optical fiber adapter 600 extends into the through hole 406 to couple and receive the light from the optical multiplexing component, and the tail of the optical fiber adapter is connected to the optical fiber socket 502 through the optical fiber 501. The light received by the optical fiber adapter 600 is transmitted to the optical fiber socket 502 via the optical fiber 501.

Specifically, FIG. 7 shows four metalized ceramics 404c, four laser chips 404a, and four collimating lenses 404b. The 4 laser chips emit light of 4 different wavelengths, and the data transmission capacity is increased by increasing the number of optical paths. The collimator lens 404b is located in the light emitting direction of the laser chip, and is used to converge the divergent light emitted by the laser chip into 4 parallel lights. Use components to combine 4 parallel lights into 1 light.

FIG. 8 is an exploded structural schematic diagram of an assembly cross-section of a light emitting sub-module and an optical fiber adapter provided by an embodiment of the application. As shown in FIG. 8, in the space enclosed by the cover 401 and the cavity 402 of the light emitting sub-module 400, there are a laser component 404, an optical multiplexing component 405, a focusing lens 407 and a through hole 406, and the optical fiber adapter 600 is inserted into the through hole 406 is used to realize the fixation with the light emitting sub-module 400; during the assembly process, the optical fiber adapter 600 can move in the through hole 406 to select a fixed position.

The optical fiber 501 is located between the optical emission sub-module 400 and the optical fiber socket 502, and the distance between the optical emission sub-module and the optical fiber socket is relatively fixed, so the size of the optical fiber must meet the distance requirements of the optical emission sub-module and the optical socket, and consider the process error Existence, in practice, the size of the optical fiber is always too short or too long. If the optical fiber is too short, it cannot be connected; if the optical fiber is too long, it will bend, and the bent optical fiber is not conducive to the propagation of optical signals.

A through hole 406 is provided on the side wall of the cavity 406, and the fiber optic adapter extends into the through hole 406 to realize the fixation with the cavity 402. This fitting structure design can make the fiber optic adapter 600 move back and forth in the through hole 406 and can be adjusted The required size of the optical fiber between the light emitting sub-module and the optical fiber plug. When the optical fiber is short, the optical fiber adapter can be moved backward (toward the outside of the cavity) in the through hole to meet the connection size requirements; when the optical fiber is longer At this time, the fiber optic adapter can be moved forward (toward the inside of the cavity) in the through hole to straighten the fiber and avoid bending of the fiber.

When the fiber optic adapter and the cavity are fixed, the fiber optic adapter is fixed in the through hole and cannot be moved, but the through hole and the fiber optic adapter can adjust the bending degree of the fiber during the assembly process to avoid the problem of the fiber being too short or too long.

As shown in FIG. 8, the light emitted by the laser chip in the laser component 404 is condensed into parallel light by the collimator lens 404b and then injected into the optical multiplexing component 405. After the multiple lights are combined into one light by the optical multiplexing component 405, It is shot into the optical fiber adapter through the focusing lens 407; the optical fiber adapter 600 includes an isolator 602 and an optical fiber ferrule 603, and the light is refracted at the optical fiber ferrule 603, changing the original propagation direction.

Although the light is converged by the focusing lens 407, the direction of the optical axis is not changed before and after the convergence, that is, the light enters along the center of the focusing lens. This incident direction can ensure that the concentrated light retains the mold spot before the convergence to the greatest extent. Distribution, presenting a regular circular spot, which is beneficial to the subsequent coupling process to improve efficiency; the light enters along the center of the focusing lens, which specifically refers to the light converging through the center of the focusing lens. Ideally, the center of the beam passes through the center of the focusing lens;

The refraction that occurs on the entrance surface of the optical fiber ferrule changes the direction of the optical axis.

The optical fiber is soft, and it is not easy to fix the position of the optical transmission sub-module with high precision, thus the optical fiber ferrule is designed. The optical fiber is wrapped by a hard material that can realize high-precision processing, and the fixing of the material realizes the fixing of the optical fiber. Specifically, the optical fiber ferrule can be formed by wrapping an optical fiber with a ceramic material. The optical fiber is used to conduct light. The ceramic has high processing accuracy and can achieve high-precision position alignment. The optical fiber and ceramic are combined to form an optical fiber ferrule. The fixation realizes the fixation of the optical fiber. The ceramic material limits the fixing direction of the optical fiber in the optical fiber ferrule. Generally, the ceramic is processed into a cylinder, and a linear through hole is set in the center of the ceramic cylinder. The optical fiber is inserted into the through hole of the ceramic cylinder to achieve fixation, so the optical fiber is straight The fixed in the ceramic body; in the optical fiber ferrule, the axial direction of the optical fiber is parallel to the axial direction of the optical fiber ferrule.

FIG. 9 is a schematic diagram of an exploded structure of an optical fiber adapter provided by an embodiment of this application, and FIG. 10 is a schematic diagram of a cross-sectional structure of an optical fiber adapter provided by an embodiment of this application. As shown in FIG. 8, FIG. 9, and FIG. 10, the optical fiber adapter 600 provided by the embodiment of the present application includes a tube case 601, an isolator 602, and an optical fiber ferrule 603. The isolator 602 and the optical fiber ferrule 603 are respectively disposed in the tube case. The optical fiber ferrule 603 is connected to the optical fiber 501; the isolator 603 allows light to pass through in a single direction and is blocked in the opposite direction to prevent reflected light from returning to the laser chip. Of course, the cut-off capability of the isolator cannot realize that all light is blocked.

Specifically, the tube case 601 has a baffle 605a to divide the space of the tube case into a first cavity 604 and a second cavity 605. The isolator 602 is arranged in the first cavity 604, and the optical fiber ferrule 603 is arranged in the first cavity. In the second cavity 605, the baffle 605a is located between the isolator 602 and the optical fiber ferrule 603, and the moving process of the optical fiber ferrule 603 extending into the second cavity is blocked by the baffle, thereby restricting the position of the optical fiber ferrule; the isolator 602 Placed in the first cavity, the position can be set with the baffle as a reference; the baffle 605a separates and fixes the isolator 602 and the optical fiber ferrule 603.

As shown in Figure 8, the light is refracted at the light incident surface of the optical fiber ferrule 603, changing the original propagation direction, and the changed propagation direction is parallel to the axis of the optical fiber in the optical fiber ferrule (ideally coincident); The axial direction of the core is not parallel to the axial direction of the optical fiber adapter, and the optical axis direction before the light enters the isolator 602 is parallel to the axial direction of the optical fiber adapter.

As shown in Figure 10, the axial direction A of the optical fiber adapter intersects the axial direction B of the optical fiber ferrule; this is because the contour axis of the second cavity 605 is inclined at a certain angle with respect to the contour axis of the optical fiber adapter 600, so that the optical fiber ferrule After the 603 is inserted into the second cavity, the axial direction of the optical fiber ferrule is not parallel to the axial direction of the optical fiber adapter.

The purpose of the structural design of using the tube shell 601 to socket the optical fiber ferrule 603 is to make the axial direction of the optical fiber ferrule 603 not parallel to the axial direction of the optical fiber adapter; thus, the optical axis direction before the light enters the isolator 602, It is not parallel to the axial direction of the optical fiber ferrule 603. In the prior art, the optical fiber ferrule can be fixed to the cavity with high precision. From the perspective of fixed connection, there is no need to use the tube shell 601 to socket the optical fiber ferrule 603; there is another prior art, The adjusting sleeve is fixed on the side wall of the cavity, and the optical fiber ferrule is arranged in the adjusting sleeve to realize coupling and focusing. In this way, the optical fiber ferrule and the adjusting sleeve have parallel axis directions, and the structure is similar to that of the present application. There are obvious differences.

The light enters the fiber through the air, and the light will not be refracted when it enters the end face of the fiber perpendicularly. In this way, it is easy to control the angle relationship between the direction of the laser chip and the fiber ferrule, but the vertical incidence will cause the reflected light to return along the original optical path. The returned light returning to the laser chip will affect the light output of the laser chip;

In order to prevent the reflected light from returning along the original optical path, the optical path is designed to make the light non-perpendicularly incident on the end face of the fiber; in order to realize the non-perpendicular light incident on the end face of the optical fiber, the light incident surface of the optical fiber is ground into a bevel, specifically, the optical fiber is wrapped in ceramic to form an optical fiber In the ferrule, the end face of the optical fiber ferrule is ground into a bevel, and the end face of the optical fiber in the optical fiber ferrule becomes a bevel accordingly.

Specifically, the optical fiber ferrule is composed of a ceramic cylinder wrapped optical fiber, the axial direction of the optical fiber ferrule is the same as the axial direction of the optical fiber, and the light incident surface of the optical fiber ferrule is ground into a bevel, that is, the light incident surface of the optical fiber is ground into the same bevel; The core layer and the cladding layer are composed of different refractive index, and the light is totally reflected at the interface between the core layer and the cladding layer, thereby constraining the transmission in the core layer.

The prerequisite for total reflection is to have a sufficiently large angle of incidence; the total reflection of light in the fiber requires that after the light is refracted at the light incident surface of the fiber, the refraction angle is small enough to meet the requirement of having a large enough when reflected again in the fiber. Angle of incidence. After refraction, a sufficiently small refraction angle is formed, and a sufficiently small incident angle is required for refraction; in order to achieve better coupling efficiency, the optical axis after entering the fiber is required to be parallel to the axis of the fiber, and the light beam entering the fiber is symmetrical with the central axis. Therefore, the light entering the light incident surface of the optical fiber has a specific incident angle range.

The light emitted by the laser chip is center-symmetric about the optical axis, and the light entering the fiber is also center-symmetric about the optical axis. Three typical rays are used as an example for illustration, and the light on the optical axis is used for illustration.

11 is a schematic diagram of an assembly cross-section of another optical emission sub-module and an optical fiber adapter provided by an embodiment of the application, and FIG. 12 is an exploded schematic diagram of an assembly cross-section of another optical emission sub-module and an optical fiber adapter provided by an embodiment of the application. As shown in Figures 11 and 12, in the space enclosed by the cover 401 and the cavity 402 of the light emitting sub-module 400, there are a laser component 404, an optical multiplexing component 405, a focusing lens 407 and a through hole 406, and the optical fiber adapter 600 is inserted The through hole 406 can be fixed to the light emitting sub-module 400; during the assembly process, the fiber optic adapter 600 can move in the through hole 406 to select a fixed position.

A through hole 406 is provided on the side wall of the cavity 402, and the fiber optic adapter extends into the through hole 406 to realize the fixation with the cavity 402. This fitting structure design can make the fiber optic adapter 600 move back and forth in the through hole 406 and can be adjusted The required size of the optical fiber between the light emitting sub-module and the optical fiber plug. When the optical fiber is short, the optical fiber adapter can be moved backward (toward the outside of the cavity) in the through hole to meet the connection size requirements; when the optical fiber is longer At this time, the fiber optic adapter can be moved forward (toward the inside of the cavity) in the through hole to straighten the fiber and avoid bending of the fiber.

In some embodiments of the present application, in the embodiment of the present application, a step is provided at one end of the through hole 406 close to the inside of the cavity 402 and the bottom of the cavity 402. When the fiber optic adapter 600 is assembled into the through hole 406, the end face of the fiber optic adapter 600 extending into the through hole 406 abuts the step, and the assembly position of the fiber optic adapter 600 is fixed through the step, and the machining accuracy is used to ensure the fiber optic adapter 600 Medium light coupling efficiency.

As shown in Figures 11 and 12, the light emitted by the laser chip in the laser component 404 is condensed into parallel light by the collimator lens 404b and then injected into the optical multiplexing component 405. The multiple lights are combined into one light by the optical multiplexing component 405 Then, it is shot into the optical fiber adapter through the focusing lens 407; the optical fiber adapter 600 includes an isolator 602 and an optical fiber ferrule 603, and the light is refracted at the optical fiber ferrule 603, changing the original propagation direction.

Although the light is converged by the focusing lens 407, the direction of the optical axis is not changed before and after the convergence, that is, the light enters along the center of the focusing lens. This incident direction can ensure that the concentrated light retains the mold spot before the convergence to the greatest extent. Distribution, presenting a regular circular spot, which is beneficial to the subsequent coupling process to improve efficiency; the light enters along the center of the focusing lens, which specifically refers to the light converging through the center of the focusing lens. Ideally, the center of the light beam passes through the center of the focusing lens; The refraction of the optical fiber ferrule changes the direction of the optical axis.

In the embodiment of the present application, as shown in FIGS. 11 and 12, the through hole 406 is inclined to the plane where the cover 401 is located, that is, the axis of the through hole 406 is inclined to the plane where the cover 401 is located, so that the light enters the light before the isolator 602. The axial direction is not parallel to the axial direction of the through hole 406, so that the optical axial direction before the light enters the isolator 602 is not parallel to the axial direction of the optical fiber ferrule 603. The light is refracted at the light incident surface of the optical fiber ferrule 603, changing the original propagation direction, and the changed optical axis propagation direction is parallel to the axial direction of the optical fiber in the optical fiber ferrule (ideally coincides). In the embodiment of the present application, the through hole 406 is inclined to realize the control of the angle between the optical axis direction before the light enters the isolator 602 and the axial direction of the optical fiber ferrule 603, which reduces the optical axis before the light enters the isolator 602. The difficulty of the angle between the direction and the axial direction of the optical fiber ferrule 603 reduces the difficulty of production.

In some embodiments of the present application, the inclination angle of the through hole 406 to the plane where the cover plate 401 is located is 2° to 7°, such as 3°.

In addition, the optical fiber is soft, and it is not easy to fix the position of the optical transmission sub-module with high precision, thus the optical fiber ferrule is designed. The optical fiber ferrule is wrapped with a hard material that can realize high-precision processing, and the fixing of the material realizes the fixing of the optical fiber. Specifically, the optical fiber ferrule can be formed by wrapping an optical fiber with a ceramic material. The optical fiber is used to conduct light. The ceramic has high processing accuracy and can achieve high-precision position alignment. The optical fiber and ceramic are combined to form an optical fiber ferrule. The fixation realizes the fixation of the optical fiber. The ceramic material limits the fixing direction of the optical fiber in the optical fiber ferrule. Generally, the ceramic is processed into a cylinder, and a linear through hole is set in the center of the ceramic cylinder. The optical fiber is inserted into the through hole of the ceramic cylinder to achieve fixation, so the optical fiber is straight The fixed in the ceramic body. In the optical fiber ferrule, the axial direction of the optical fiber is parallel to the axial direction of the optical fiber ferrule.

FIG. 13 is an exploded schematic diagram 1 of another optical emission sub-module and an optical fiber adapter provided by an embodiment of this application, and FIG. 14 is an exploded schematic diagram 2 of another optical emission sub-module and an optical fiber adapter provided by an embodiment of this application. As shown in FIGS. 13 and 14, the optical fiber adapter 600 provided in the embodiment of the present application includes a tube case 601, an isolator 602 and an optical fiber ferrule 603. The tube shell 601, the isolator 602, and the optical fiber ferrule 603 are all cylindrical structures, and the through hole 106 is a cylindrical through hole.

The isolator 602 and the optical fiber ferrule 603 are respectively disposed in the tube shell 601, and the optical fiber ferrule 603 is connected to the optical fiber 501a. The fixing cooperation of the tube shell 601 and the through hole 406 realizes the fixing of the optical fiber adapter 600 and the cavity 402. The tube shell 601 is used to fix the isolator 602 and the optical fiber ferrule 603, and facilitate the installation of the isolator 602 and the optical fiber ferrule 603. The isolator 603 allows light to pass through in a single direction and is blocked in the opposite direction to prevent reflected light from returning to the laser chip. Of course, the cut-off capability of the isolator 603 cannot realize that all light is blocked.

In order to facilitate the fixation of the isolator and the optical fiber ferrule, a baffle is provided in the tube shell, and the baffle is used for limiting the position of the isolator and the optical fiber ferrule. FIG. 15 is an exploded cross-sectional schematic diagram of another optical fiber adapter provided by an embodiment of the application. As shown in FIG. 15, the tube shell 601 has a baffle 605a to divide the space of the tube shell 601 into a first cavity 604 and a second cavity 605. The isolator 602 is arranged in the first cavity 604, the optical fiber ferrule 603 is arranged in the second cavity 605, the baffle 605a is located between the isolator 602 and the optical fiber ferrule 603, and the optical fiber ferrule 603 extends into the second cavity The moving process of 605 is blocked by the baffle, thereby restricting the position of the optical fiber ferrule 603; the isolator 602 is placed in the first cavity, and the position can be set with the baffle as a reference. The baffle 605a separates and fixes the isolator 602 and the optical fiber ferrule 603.

Alternatively, a hole for installing the isolator and the optical fiber ferrule is provided in the tube case, and the aperture size of the hole for installing the isolator and the optical fiber ferrule is different, thereby facilitating the isolator and the optical fiber insertion when installing the isolator and the optical fiber ferrule. The limit of the core ensures the installation accuracy of the isolator and optical fiber ferrule.

In some embodiments of the present application, the axial direction of the isolator 602 is parallel to the axial direction of the optical fiber ferrule 603, for example, the axial direction of the isolator 602 coincides with the axial direction of the optical fiber ferrule 603. Specifically, the axial direction of the first cavity 604 and the axial direction of the second cavity 605 can be overlapped, so that the axial direction of the isolator 602 coincides with the axial direction of the optical fiber ferrule 603.

16 is a schematic diagram of a partial assembly cross-section of another optical emission sub-module and optical fiber adapter provided by an embodiment of the application. As shown in FIG. 16, in the embodiment of the present application, the through hole 406 is inclined in a direction away from the bottom end of the cavity 402, and the axial direction C of the through hole 406 intersects the optical axis direction D before the light enters the isolator 602. As shown in FIG. 16, the axial direction C of the through hole 406 is parallel to the axial direction B of the optical fiber ferrule 603 (ideally coincides), and the optical axis direction D before the light enters the isolator 602 and the optical fiber ferrule 603 The axis direction B intersects.

The light enters the fiber of the fiber ferrule through the air, and the light will not be refracted when it enters the fiber end face of the fiber ferrule perpendicularly. This method is easy to control the angle relationship between the laser chip's light direction and the fiber ferrule, but the vertical incidence will The reflected light returns along the original optical path, and the returned light returns to the laser chip, which will affect the laser chip's light output.

In order to prevent the reflected light from returning along the original optical path, the optical path is designed to make the light non-perpendicularly incident on the end face of the optical fiber; in order to achieve non-perpendicular light incident on the end face of the optical fiber, the light incident surface of the optical fiber ferrule is ground into a bevel. Specifically, as shown in FIG. 16, the optical fiber is wrapped in ceramic to form an optical fiber ferrule 603, and the end surface of the optical fiber ferrule 603 is ground into a bevel, and the fiber end surface in the fiber ferrule 603 forms a bevel 603a accordingly. The inclined surface 603a is inclined toward the bottom surface of the cavity 402, and the inclination angle may be 6° to 15°, such as 7°. The light transmitted to the end face of the optical fiber ferrule 603 is refracted into the optical fiber ferrule 603 through the inclined surface 603a, and the combination of the inclined surface 603a and the inclined through hole 406 can realize the optical axis direction of the signal light that is refracted and enters the optical fiber ferrule 603. The axis directions are parallel or nearly parallel, and finally the signal light output by the light emission sub-module is coupled into the optical fiber with high efficiency.

In some embodiments of the present application, the optical fiber ferrule is composed of a ceramic cylinder wrapped with an optical fiber, the axial direction of the optical fiber ferrule is the same as the axial direction of the optical fiber, and the light incident surface of the optical fiber ferrule is ground into a bevel, that is, the light incident surface of the optical fiber is ground The same inclined plane; the optical fiber is composed of a core layer and a cladding layer with different refractive indexes, and the light is totally reflected at the interface between the core layer and the cladding layer, thereby constraining the transmission in the core layer.

The premise for total reflection is to have a sufficiently large angle of incidence. Therefore, the total reflection of light in the optical fiber requires that after the light is refracted at the light incident surface of the optical fiber, the refraction angle is small enough to satisfy that the light has a large enough incident angle when it is reflected again in the optical fiber. After refraction, a sufficiently small refraction angle is formed, and a sufficiently small incident angle is required for refraction; in order to achieve better coupling efficiency, the optical axis after entering the fiber is required to be parallel to the axis of the fiber, and the beam entering the fiber is symmetrical with the central axis. Therefore, the light entering the light incident surface of the optical fiber has a specific incident angle range.

Fig. 17A is a schematic diagram of the optical path structure of an optical emission sub-module provided by the prior art, and Fig. 17B is a simulation diagram of the coupling efficiency of the optical path structure in Fig. 17A. As shown in Fig. 11, the laser chip 404a, the collimating lens 404b and the focusing lens 407 are respectively located in the light emitting sub-module cavity 402; the axial direction of the optical fiber ferrule is parallel to the optical axis of the laser chip, and the axial direction of the optical fiber adapter A is parallel to the axial direction of the optical fiber ferrule, and the axial direction of the optical fiber ferrule is parallel to the axial direction of the optical fiber in the optical fiber ferrule (ideally coincides); the divergent light emitted by the laser chip is converged into parallel light by the collimating lens. The light is converged by the center of the focusing lens and then enters the light incident surface of the optical fiber 603a. After two times of convergence, the light maintains the original optical axis direction, the spot shape remains unchanged, and is a circular spot under ideal conditions; the concentrated light meets the angle requirement of the total reflection of the optical fiber, and the optical axis of the concentrated light is perpendicular to the light incident surface of the optical fiber. As shown in Figure 17B, the light is converged through the center of the focusing lens 407, and the converged light is coupled to the fiber ferrule 603. Most of the light is transmitted through the fiber in the center of the fiber ferrule, and there is less light distributed around the fiber. , The optical path structure of Figure 17A achieves a higher coupling efficiency.

The optical axis is perpendicular to the light incident surface, and the refraction that occurs at this time has the smallest incident angle (0°) and the smallest refraction angle. The optical path design adopted in Fig. 17A can meet the angle requirement of the total reflection of the optical fiber, and the spot shape is also conducive to optical coupling, but the reflected light generated on the light incident surface of the optical fiber will return along the original optical path, thereby affecting the light output of the laser chip.

The advantage of the optical path design of Fig. 17A and Fig. 17B is that the center of the focusing lens is used to converge the light path, which can maintain a better spot and mode spot shape. The disadvantage is that the reflected light generated by the optical fiber incident surface will return to the laser chip along the original optical path. .

FIG. 18A is a schematic diagram of the optical path structure of the optical emission submodule provided by the prior art, and FIG. 18B is a simulation diagram of the coupling efficiency of the optical path structure in FIG. 18A. The difference in the tilt direction of the inclined surface of the optical fiber ferrule is only the difference in the viewing angle. The optical fiber ferrule is a cylinder, and the tilt direction of the inclined surface is different when the angle of view is rotated. As shown in FIG. 18A, the laser chip 404a, the collimating lens 404b, and the focusing lens 407 are respectively located in the light emitting sub-module cavity 402, and the direction of the axis of the optical fiber ferrule (the axis of the optical fiber) is parallel to the direction of the optical axis of the laser chip. The axial direction A of the optical fiber adapter is parallel to the axial direction of the optical fiber ferrule, and the axial direction of the optical fiber ferrule is parallel to the axial direction of the optical fiber in the optical fiber ferrule (ideally coincides); the divergent light emitted by the laser chip is converged by the collimating lens For parallel light, the parallel light is condensed by the focusing lens and then enters the light incident surface of the fiber 603a; in order to prevent the reflected light from being reversibly reflected back to the laser chip, the light incident surface of the fiber is inclined; in order to use the principle of refraction to make the light entering the fiber meet the full The condition of reflection is that the light enters the non-center position of the focusing lens 407, and the light is condensed through the non-center of the focusing lens 404. After the optical axis direction of the light is changed by the focusing lens 407, it enters the light incident slope of the optical fiber; The inclined plane refracts light and enters the optical fiber.

As shown in Figure 18A, compared with Figure 17A, the light incident surface of the optical fiber is inclined, and the direction of the optical fiber axis in the optical fiber ferrule has not changed. In order to make the refracted light meet the condition of total reflection, the convergent light must not maintain the image. 17A this kind of propagation direction; specifically, the optical axis keeps the direction in Figure 17A, parallel to the direction of the laser chip's light-emitting optical axis, then the incident surface of the light is incident in a non-vertical direction, the incident angle is reduced, and the refraction angle is also reduced It is not conducive to total reflection; in order to increase the angle of incidence, the optical axis direction in Figure 17A is changed in the scheme of FIG. 18A, and the optical axis direction after converging by the focusing lens is not parallel to the optical axis direction of the laser chip. Increase the angle of incidence during refraction.

From the simulation diagram in FIG. 18B, it can be seen that the direction of the optical axis of the light converged by the focusing lens is changed, so that the converged light is different from the propagation direction in Figure 17B. At this time, the light passes through the non-central position of the focusing lens 407. Converge. In order to achieve total reflection in the light, the light entering the light incident surface of the optical fiber has a specific incident angle range, which also limits the light condensed by the focusing lens 404 and cannot be condensed through the center of the focusing lens 407.

With the optical path design shown in Figure 18A, the optical axis does not pass through the center of the focusing lens 407, and the direction of the optical axis is changed after the light passes through the focusing lens. The light spot will be deformed greatly, the shape of the light spot will be distorted, and the mode field distribution of the light spot will be irregular. The efficiency of coupling into the fiber is significantly reduced.

The advantage of the optical path design of Fig. 18A and Fig. 18B is to prevent the reflected light from the light incident surface of the optical fiber from returning to the laser chip along the original optical path. The disadvantage is that the center of the focusing lens is not used to converge the optical path. Produce greater deterioration.

18C is a simulation diagram of the coupling efficiency of the optical axis entering the inclined fiber ferrule through the center of the focusing lens. As shown in Figure 18C, the light incident surface of the optical fiber ferrule is inclined. The light emitted by the laser chip 404a is collimated by the collimating lens 404b, and then converged by the focusing lens 407 into the optical fiber adapter 603; the light passes through the center of the focusing lens 407 For convergence, the axis direction A of the fiber optic adapter is parallel to the center axis direction of the focusing lens 407, the axis direction of the fiber optic ferrule 603 is parallel to the axis direction A of the fiber adapter, and the center axis direction of the focusing lens is parallel to the axis direction of the light adapter. The axial direction of the ferrule is parallel to the axial direction of the optical fiber in the optical fiber ferrule (ideally coincident); the light is coupled into the optical fiber adapter after refraction, and a large amount of light can be seen from the optical fiber of the optical fiber adapter, and the coupling efficiency is relatively high. low.

FIG. 19A is a schematic diagram of the optical path structure of the optical emission submodule provided by an embodiment of the application, and FIG. 19B is a simulation diagram of the coupling efficiency of the optical path structure in FIG. 19A. The difference in the tilt direction of the inclined surface of the optical fiber ferrule is only the difference in the viewing angle. The optical fiber ferrule is a cylinder, and the tilt direction of the inclined surface is different when the angle of view is rotated. As shown in Figure 19A, the laser chip 404a, the collimating lens 404b and the focusing lens 407 are respectively located in the light emitting sub-module cavity 402; the direction of the axis of the optical fiber ferrule 603 (the axis of the optical fiber 603a) is different from the axis direction A of the optical fiber adapter. Parallel, the direction of the optical fiber in the optical fiber ferrule is parallel to the axial direction of the optical fiber ferrule (ideally coincides); the axial direction of the optical fiber ferrule is not parallel to the axial direction A of the optical fiber adapter/fiber adapter housing; the light from the laser chip The optical axis direction is parallel to the axis direction of the fiber optic adapter/fiber adapter housing; the divergent light emitted by the laser chip is condensed into parallel light by the collimator lens, and the parallel light is condensed by the focusing lens and then enters the light incident surface of the optical fiber 603a;

In order to prevent the reflected light from being reversibly reflected back to the laser chip, the light incident surface of the optical fiber is inclined; in order to use the principle of refraction to inject light into the optical fiber, the light emitted by the laser chip is emitted through the center of the focusing lens without changing the original optical axis during the focusing process Direction, when it enters the light incident slope of the optical fiber, it enters the optical fiber 603a through light refraction.

The optical path design provided in Fig. 19A aims to maintain a good spot mode shape after the light is converged, and to match the optical fiber ferrule with the entrance slope to complete the high-efficiency coupling of light into the optical fiber.

In order to maintain a better light spot and mode spot shape after converging, the light is condensed through the center of the focusing lens 407, and the light is emitted through the center of the focusing lens. The direction of the focused optical axis remains unchanged, and the light after converging remains before converging. The light spot shape can maintain a circular spot shape under the ideal shape, which is beneficial to improve the efficiency of light coupling.

In order to prevent the reflected light from the light incident surface of the optical fiber from returning to the laser chip along the original optical path, the light incident surface of the optical fiber ferrule/the light incident surface of the optical fiber is designed to be inclined. However, the optical path structure shown in Figure 17A shows that when the light When converging through the center of the focusing lens, the light incident surface of the subsequent matching fiber cannot be an inclined plane, so that the light refracted at the light incident surface can undergo total reflection transmission; the optical path structure shown in Figure 18A shows that when the incident When the light surface is an oblique surface, the light matched with it in the front cannot be condensed through the center of the focusing lens, so that the light refracted at the light incident surface can undergo total reflection transmission.

In order to cause total reflection of the light coupled into the optical fiber, the embodiment of the present application provides a new structural design, so that the axis of the optical fiber ferrule 603 (the axis 603a of the optical fiber) is not parallel to the light output direction of the laser chip, so that the optical fiber ferrule It is inclined at a certain angle relative to the direction of the laser chip.

After the light is refracted into the optical fiber, it has a specific angular relationship with the axis of the optical fiber. This angular relationship is exactly the same in FIGS. 17A, 18A and 19A. This is also an inevitable requirement for the full emission of light in the optical fiber.

As shown in Figure 19B, using the optical path structure of Figure 19A, the light is condensed through the center of the focusing lens 407. The light incident surface of the optical fiber is inclined. The light collected by the focusing lens can be efficiently coupled into the optical fiber, and most of the light enters the optical fiber. In the optical fiber.

In Figure 18A and Figure 19B, taking the light incident angle of the optical fiber as a reference, the incident angle of light is the same, and the angle after light refraction is also the same; the difference is that the fiber axis direction in Figure 18 is parallel to the light exit direction of the laser chip. The axis passes through the non-central area of the focusing lens; while the fiber axis direction in Fig. 19 is not parallel to the light output direction of the laser chip, and the optical axis passes through the central area of the focusing lens.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the application, not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions recorded in the foregoing embodiments are modified, or some of the technical features are equivalently replaced; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

An optical module, characterized by comprising an upper shell, a lower shell, a light emission sub-module cavity, an optical fiber adapter, an optical fiber, and an optical fiber socket respectively located between the upper shell and the lower shell;

The light emitting sub-module cavity and the optical fiber socket are respectively fixed on the surface of the lower housing;

The light emitting sub-module cavity includes a light emitting chip and a lens, and the side wall of the light emitting sub-module cavity has a through hole,

One end of the optical fiber adapter extends into the through hole, and the other end is connected to the optical fiber socket through the optical fiber;

The light emitted by the light-emitting chip is incident into the optical fiber adapter through the lens.
The optical module according to claim 1, wherein the optical fiber adapter includes a tube shell and an optical fiber ferrule, the light emitted by the light-emitting chip is converged through the center of the lens, and the axial direction of the tube shell is The axial directions of the optical fiber ferrule are not parallel, and the light incident surface of the optical fiber ferrule is a slope.
The optical module according to claim 1, wherein the surface of the lower housing has a groove, the groove has a gap, the optical fiber socket has a protrusion, and the protrusion is placed in the gap, In order to realize the fixing of the optical fiber socket and the lower casing.
The optical module according to claim 3, further comprising a circuit board, the cavity of the light emitting sub-module has an opening, and the circuit board extends into the cavity through the opening, and the circuit The board is fixed with the lower casing.
The optical module of claim 2, wherein the tube case further comprises a baffle and an isolator, the isolator is located on one side of the baffle, and the optical fiber ferrule is located on the side of the baffle. The other side; the optical fiber is located in the optical fiber ferrule, the axial direction of the optical fiber is parallel to the axial direction of the optical fiber ferrule; the axial direction of the package is parallel to the light-emitting optical axis direction of the light emitting chip ; The axial direction of the isolator is parallel to the axial direction of the shell.
An optical module, characterized in that it comprises:

Optical emission sub-module, used to output signal light;

Optical fiber, used to transmit the signal light output by the light emission sub-module;

An optical fiber adapter, one end is connected to the light emission sub-module, and the other end is connected to one end of the optical fiber, for coupling the signal light output by the light emission sub-module to the optical fiber;

An optical fiber socket, one end of which is connected to the other end of the optical fiber, and is used for connecting the optical module to an external optical fiber;

The light emission sub-module includes:

A light emitting sub-module cavity, a side wall of the light emitting sub-module cavity is provided with a through hole, and the through hole is used to insert one end of the optical fiber adapter;

The light emitting chip is arranged in the cavity of the light emitting sub-module for generating signal light;

A lens, arranged in the cavity of the light emitting sub-module and on the transmission optical path of the signal light, for converging the signal light to the optical fiber coupler;

Wherein, the through hole is inclined to the top surface of the light emitting sub-module cavity, so that the axial direction of the through hole is not parallel to the axial direction of the lens.
The optical module according to claim 6, wherein the optical fiber adapter comprises a tube shell and an optical fiber ferrule, the axial direction of the tube shell is parallel to the axial direction of the optical fiber ferrule, and the optical fiber ferrule The light incident surface is inclined.
The optical module according to claim 6, wherein the optical module further comprises a lower housing, and the lower housing supports and connects the cavity of the light emitting sub-module;

The inner surface of the lower housing is provided with a clamping groove, the clamping groove is provided with a gap, and the optical fiber socket is provided with a protrusion; the protrusion is placed in the gap to realize the connection between the optical fiber socket and the optical fiber socket. The lower housing is fixed, and the inclination angle of the through hole to the top surface of the light emitting sub-module cavity is 3°.
8. The optical module according to claim 8, wherein the optical module further comprises a circuit board, the cavity of the light emitting sub-module is provided with an opening, and the circuit board extends into the cavity through the opening Wherein, the circuit board is fixed to the lower casing.
The optical module according to claim 7, wherein a baffle and an isolator are further provided in the tube case, the isolator is located on one side of the baffle, and the optical fiber ferrule is located in the barrier. The other side of the board; the optical fiber is located in the optical fiber ferrule, the axial direction of the optical fiber is parallel to the axial direction of the optical fiber ferrule; the axial direction of the optical fiber ferrule and the axial direction of the through hole Parallel; the axis of the isolator is parallel to the axis of the shell.