CN111983759A

CN111983759A - Optical module

Info

Publication number: CN111983759A
Application number: CN202010981241.4A
Authority: CN
Inventors: 刘旭霞; 马晓磊
Original assignee: Hisense Broadband Multimedia Technology Co Ltd
Current assignee: Hisense Broadband Multimedia Technology Co Ltd
Priority date: 2020-09-17
Filing date: 2020-09-17
Publication date: 2020-11-24

Abstract

The application discloses optical module, including fiber support and lens subassembly. The optical fiber support is fixed with an optical fiber at the inner side, and the tail end of the optical fiber support is provided with a first lens. The fiber end face faces the first lens. The surface of the lens component facing the first lens is a refraction surface, the inner surface of the lens component is provided with a second lens facing the optical chip, and the outer surface of the lens component is provided with a reflection surface. When the optical signal emitted by the optical chip through the lens component is horizontal parallel light, the central axis of the first lens coincides with the central axis of the optical fiber. When the optical signal emitted by the optical chip through the lens component is oblique and parallel light, the central axis of the first lens is not coincident with the central axis of the optical fiber. In the application, the optical fiber is fixed on the optical fiber bracket, so that the optical fiber shaking is effectively reduced, and the optical signal coupled to the center of the optical fiber is increased; the optical signal is transmitted between the lens component and the optical fiber support in a parallel light mode, and the capability of bearing the deviation of the optical signal is strong, so that the optical signal coupled to the center of the optical fiber is increased, and the coupling efficiency is improved.

Description

Optical module

Technical Field

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

Background

Traditional optical module includes fiber support, lens subassembly and optical fiber array, and fiber support's one end passes through the reference column with the lens subassembly to be connected with the locating hole, and optical fiber array includes many optic fibres, and many optic fibres are fixed in the fixed slot on the light support. And the optical fibers extend out of the optical fiber support along the optical fiber slots and are correspondingly contacted with the lens array at one end of the lens component.

As the diameter of the optical fiber slot is 0.126-0.130mm and the diameter of the optical fiber is 0.125 +/-0.001 mm, the optical fiber can be tilted up and down in the optical fiber slot. And because the optical fiber extends out of one end of the optical fiber bracket along the optical fiber slot by a distance, the optical fiber is more easily warped up and down. Due to the above reasons, the light spot emitted by the lens assembly cannot reach the center of the optical fiber according to a theoretical value, and the coupling efficiency of the optical signal is reduced.

Disclosure of Invention

The application provides an optical module, which improves the coupling efficiency of optical signals.

A light module, comprising:

a circuit board;

the optical fiber support is fixed on the circuit board, the optical fiber is fixed on the inner side of the optical fiber support, and the tail end of the optical fiber support is provided with a first lens;

the end face of the optical fiber faces the first lens;

the lens component is covered on the optical chip, the surface facing the first lens is a refraction surface, the inner surface is provided with a second lens facing the optical chip, and the outer surface is provided with a reflection surface;

a refractive surface provided with no lens;

when the optical signal emitted by the optical chip is horizontally parallel light through the second lens, the reflecting surface and the refracting surface, the central axis of the first lens is superposed with the central axis of the optical fiber;

when the optical signal emitted by the optical chip through the second lens, the reflecting surface and the refracting surface is oblique parallel light, the central axis of the first lens is not overlapped with the central axis of the optical fiber, and the vertical distance between the central axis of the first lens and the central axis of the optical fiber is determined by the focal length of the first lens and the included angle between the oblique parallel light and the refracting surface.

Has the advantages that: the application provides an optical module, including the circuit board, be fixed in the fiber support on the circuit board and cover lens subassembly of locating on the optical chip. The optical fiber support is fixed with an optical fiber at the inner side, and the tail end of the optical fiber support is provided with a first lens. The end face of the optical fiber faces the first lens. And the surface of the lens component facing the first lens is a refraction surface, the inner surface of the lens component is provided with a second lens facing the optical chip, and the outer surface of the lens component is provided with a reflection surface. And a refractive surface without a lens. When the optical signal emitted by the optical chip is horizontally parallel light through the second lens, the reflecting surface and the refracting surface, the central axis of the first lens is superposed with the central axis of the optical fiber. When the optical signal emitted by the optical chip through the second lens, the reflecting surface and the refracting surface is oblique parallel light, the central axis of the first lens is not overlapped with the central axis of the optical fiber, and the vertical distance between the central axis of the first lens and the central axis of the optical fiber is determined by the focal length of the first lens and the included angle between the oblique parallel light and the refracting surface. When the optical signal emitted from the lens component is horizontal parallel light, the central axis of the first lens coincides with the central axis of the optical fiber, and then the optical signal emitted from the lens component is coupled to the center of the optical fiber through the first lens. When the optical signal emitted from the lens component is oblique parallel light, the central axis of the first lens is coincident with the central axis of the optical fiber, and the optical signal emitted from the lens component is coupled to the center of the optical fiber through the first lens. In the application, the optical fiber is fixed on the optical fiber support, and the optical fiber does not extend out of the outer side of the optical fiber support, so that the shaking of the optical fiber can be effectively reduced, the optical signal coupled to the center of the optical fiber is increased, and the coupling efficiency is improved; the optical signal is transmitted between the lens component and the optical fiber support in a parallel light mode, and the capability of bearing the deviation of the optical signal is strong, so that the optical signal coupled to the center of the optical fiber is increased, and the coupling efficiency is improved.

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 a 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 an exploded structural diagram of an optical module according to an embodiment of the present application;

FIG. 5 is a schematic structural diagram of a circuit board, a fiber support and a lens assembly according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of a fiber holder and a lens assembly according to an embodiment of the present disclosure;

FIG. 7 is an exploded view of a fiber holder and lens assembly according to an embodiment of the present disclosure;

FIG. 8 is a schematic view of a first angled configuration of a fiber optic support according to an embodiment of the present disclosure;

FIG. 9 is a second angular configuration of a fiber optic support according to an embodiment of the present disclosure;

FIG. 10 is a third angled view of a fiber optic shelf according to an embodiment of the present disclosure;

FIG. 11 is a planar view of an optical fiber holder according to an embodiment of the present disclosure;

FIG. 12 is a schematic view of a first angled configuration of another fiber optic support according to an embodiment of the present application;

FIG. 13 is a second angled view of another fiber optic support according to an embodiment of the present disclosure;

FIG. 14 is a schematic third angle view of another fiber optic support according to an embodiment of the present disclosure;

FIG. 15 is a planar view of another fiber optic holder provided in accordance with an embodiment of the present application;

FIG. 16 is a schematic diagram of a first angular configuration of a lens assembly provided by an embodiment of the present application;

FIG. 17 is a schematic diagram of a second angular configuration of a lens assembly provided by an embodiment of the present application;

FIG. 18 is a schematic diagram of a third angular configuration of a lens assembly provided by an embodiment of the present application;

FIG. 19 is a planar view of a lens assembly provided in accordance with an embodiment of the present application;

FIG. 20 is a plan view of a fiber holder and lens assembly according to an embodiment of the present application;

FIG. 21 is a schematic diagram of a first optical path provided in an embodiment of the present application;

FIG. 22 is a schematic diagram of a second optical path provided by an embodiment of the present application;

FIG. 23 is a schematic diagram of a third optical path provided in an embodiment of the present application;

fig. 24 is a schematic diagram of a fourth optical path according to an embodiment of the present application.

Detailed Description

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

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

In the following, some embodiments of the present application will be described in detail with reference to the drawings, and features in the following examples and examples may be combined with each other without conflict.

One of the core links of optical fiber communication is the interconversion of optical and electrical signals. The optical fiber communication uses optical signals carrying information to transmit in information transmission equipment such as optical fibers/optical waveguides, and the information transmission with low cost and low loss can be realized by using the passive transmission characteristic of light in the optical fibers/optical waveguides; meanwhile, the information processing device such as a computer uses an electric signal, and in order to establish 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, it is necessary to perform interconversion between the electric signal and the optical signal.

The optical module realizes the function of interconversion of optical signals and electrical signals in the technical field of optical fiber communication, and the interconversion of the optical signals and the electrical signals is the core function of the optical module. The optical module is electrically connected with an external upper computer through a golden finger on an internal circuit board of the optical module, and the main electrical connection comprises power supply, I2C signals, data signals, grounding and the like; the optical module realizes optical connection with external optical fibers through an optical interface, the external optical fibers are connected in various ways, and various optical fiber connector types are derived; the method is characterized in that the electric connection is realized by using a golden finger at an electric interface, which becomes the mainstream connection mode of the optical module industry, and on the basis, the definition of pins on the golden finger forms various industry protocols/specifications; the optical connection mode realized by adopting the optical interface and the optical fiber connector becomes the mainstream connection mode of the optical module industry, on the basis, the optical fiber connector also forms various industry standards, such as an LC interface, an SC interface, an MPO interface and the like, the optical interface of the optical module also makes adaptive structural design aiming at the optical fiber connector, and the optical fiber adapters arranged at the optical interface are various.

Fig. 1 is a schematic diagram of connection relationship of an optical communication terminal. As shown in fig. 1, the connection of the optical communication terminal mainly includes the interconnection among the optical network terminal 100, the optical module 200, the optical fiber 101 and the network cable 103;

one end of the optical fiber 101 is connected with a far-end server, one end of the network cable 103 is connected with local information processing equipment, and the connection between the local information processing equipment and the far-end server is completed by the connection between the optical fiber 101 and the network cable 103; and the connection between the optical fiber 101 and the network cable 103 is made by the optical network terminal 100 having the optical module 200.

An optical interface of the optical module 200 is externally accessed to the optical fiber 101, and establishes bidirectional optical signal connection with the optical fiber 101; the electrical interface of the optical module 200 is externally connected to the optical network terminal 100, and establishes a bidirectional electrical signal connection with the optical network terminal 100; bidirectional interconversion of optical signals and electric signals is realized inside the optical module, so that information connection is established between the optical fiber and the optical network terminal; specifically, the optical signal from the optical fiber 101 is converted into an electrical signal by the optical module and then input to the optical network terminal 100, and the electrical signal from the optical network terminal 100 is converted into an optical signal by the optical module and input to the optical fiber 101.

The optical network terminal is provided with an optical module interface 102, which is used for accessing an optical module 200 and establishing bidirectional electric signal connection with the optical module 200; the optical network terminal has a network cable interface 104, which is used for accessing the network cable 103 and establishing a bidirectional electrical signal connection (generally, an electrical signal of an ethernet protocol, which is different from an electrical signal used by an optical module in protocol/type) with the network cable 103; the optical module 200 is connected to the network cable 103 through the optical network terminal 100, specifically, the optical network terminal transmits a signal from the optical module to the network cable and transmits the signal from the network cable to the optical module, and the optical network terminal serves as an upper computer of the optical module to monitor the operation of the optical module. The optical network terminal is an upper computer of the optical module, provides data signals for the optical module and receives the data signals from the optical module, and a bidirectional signal transmission channel is established between the remote server and the local information processing equipment through the optical fiber, the optical module, the optical network terminal and a network cable.

Common local information processing apparatuses include routers, home switches, electronic computers, and the like; common optical network terminals include an optical network unit ONU, an optical line terminal OLT, a data center server, a data center switch, and the like.

Fig. 2 is a schematic diagram of an optical network terminal structure. As shown in fig. 2, the optical network terminal 100 has a circuit board 105, and a cage 106 is disposed on a surface of the circuit board 105; an electrical connector is arranged in the cage 106 and used for accessing an electrical interface (such as a gold finger) of the optical module; the cage 106 is provided with a heat sink 107, and the heat sink 107 has a projection such as a fin that increases a heat radiation area.

The optical module 200 is inserted into an optical network terminal, the electrical interface of the optical module is inserted into the electrical connector inside the cage 106, and the optical interface of the optical module is connected to the optical fiber 101.

The cage 106 is positioned on the circuit board, and the electrical connector on the circuit board is wrapped in the cage, so that the electrical connector is arranged in the cage; the optical module is inserted into the cage, held by the cage, and the heat generated by the optical module is conducted to the cage 106 and then diffused by the heat sink 107 on the cage.

Fig. 3 is a schematic diagram of an optical module structure provided in the embodiment of the present application, and fig. 4 is an exploded schematic diagram of the optical module provided in the embodiment of the present application. As shown in fig. 3 to 4, an optical module 200 provided in an embodiment of the present application includes an upper housing 201, a lower housing 202, an unlocking member 203, a circuit board 300, a lens assembly 400, an optical fiber array 500, and an optical fiber adapter 600.

The upper shell 201 is covered on the lower shell 202 to form a wrapping cavity with two openings; the outer contour of the wrapping cavity is generally a square body, and specifically, the lower shell comprises a main plate and two side plates which are positioned at two sides of the main plate and are perpendicular to the main plate; the upper shell comprises a cover plate, and the cover plate covers two side plates of the upper shell to form a wrapping cavity; the upper shell can also comprise two side walls which are positioned at two sides of the cover plate and are perpendicular to the cover plate, and the two side walls are combined with the two side plates to realize that the upper shell covers the lower shell.

The two openings may be two openings (204, 205) located at the same end of the optical module, or two openings located at different ends of the optical module; one of the openings is an electrical interface 204, and a gold finger of the circuit board extends out of the electrical interface 204 and is inserted into an upper computer such as an optical network terminal; the other opening is an optical interface 205 where a fiber optic adapter inside the optical module is located for connection with an external fiber optic connector (external fiber); the photoelectric devices such as the circuit board 300, the lens assembly 400, the optical fiber array 500 and the optical fiber adapter 600 are positioned in the packaging cavity.

The assembly mode of combining the upper shell and the lower shell is adopted, so that the circuit board 300, the lens assembly 400, the optical fiber array 500, the optical fiber adapter 600 and other devices can be conveniently installed in the shells, and the outermost packaging protection shell of the optical module is formed by the upper shell and the lower shell; the upper shell and the lower shell are made of metal materials generally, so that electromagnetic shielding and heat dissipation are facilitated; generally, the housing of the optical module is not made into an integrated component, and the integrated housing is not beneficial to the assembly of devices in the housing.

The unlocking component 203 is located on the outer wall of the wrapping cavity/lower shell 202, and is used for realizing the fixed connection between the optical module and the upper computer or releasing the fixed connection between the optical module and the upper computer.

The unlocking component 203 is provided with a clamping component matched with the upper computer cage; the end of the unlocking component can be pulled to enable the unlocking component to move relatively on the surface of the outer wall; the optical module is inserted into a cage of the upper computer, and the optical module is fixed in the cage of the upper computer by a clamping component of the unlocking component; by pulling the unlocking component, the clamping component of the unlocking component moves along with the unlocking component, so that the connection relation between the clamping component and the upper computer is changed, the clamping relation between the optical module and the upper computer is released, and the optical module can be drawn out from the cage of the upper computer.

The circuit board 300 is provided with a light emitting chip LD, a driving chip LDD, a light receiving chip PD, a transimpedance amplifier chip TIA, a limiting amplifier chip LA, and a microprocessor chip MCU, wherein the light emitting chip and the light receiving chip are directly mounted on the circuit board of the optical module, and such a configuration is referred to as cob (chip board) package in the industry.

The circuit board connects the electrical appliances in the optical module together according to the circuit design through circuit wiring to realize the functions of power supply, electrical signal transmission, grounding and the like.

The circuit board is generally a hard circuit board, and the hard circuit board can also realize a bearing effect due to the relatively hard material of the hard circuit board, for example, the hard circuit board can stably bear a chip; when the lens component is positioned on the circuit board, the rigid circuit board can also provide stable bearing; the hard circuit board can also be inserted into an electric connector in the upper computer cage, and specifically, 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. A common rigid circuit board is a printed circuit board, PCB.

Optical modules sometimes use flexible circuit boards as a complement to rigid circuit boards; flexible circuit boards are commonly used in conjunction with rigid circuit boards.

The lens assembly 400 is disposed on the circuit board 300, and is covered above the optical chip 301 (the optical chip mainly refers to a light emitting chip, a driving chip, a light receiving chip, a transimpedance amplifier chip, an amplitude limiting amplifier chip, and other chips related to a photoelectric conversion function) in a cover-and-buckle manner, the lens assembly 400 and the circuit board 300 form a cavity for wrapping the light emitting chip, the light receiving chip, and other optical chips, and the lens assembly 400 and the circuit board 300 together form a structure for packaging the optical chip. Light emitted from the light emitting chip is reflected by the lens assembly 400 and enters the optical fiber array 400, light from the optical fiber array 400 is reflected by the lens assembly 400 and enters the light receiving chip, and the lens assembly establishes mutual optical connection between the light emitting chip and the optical fiber array. The lens assembly not only serves to seal the optical chip, but also to establish optical connections between the optical chip and the optical fiber array.

Lens assembly 400 may be integrally formed from a polymer material using an injection molding process. Specifically, the lens assembly 400 is made of a material having a good light transmittance, such as PEI (Polyetherimide) plastic (Ultem series). Because all of the beam spreading elements in lens assembly 400 are formed from the same single sheet of polymer material, the number of molding dies and manufacturing costs and complexity can be significantly reduced. Meanwhile, the lens assembly 400 structure provided by the embodiment of the application only needs to adjust the positions of the incident light beam and the optical fiber, and is simple to install and debug.

Optical fiber array 500 establishes optical connection between one end and lens assembly 400 and optical connection between the other end and fiber optic adapter 600. The optical fiber array is composed of a plurality of optical fibers, transmits light from the lens assembly to the optical fiber adapter to send out optical signals to the outside, transmits the light from the optical fiber adapter to the lens assembly, and receives the optical signals from the outside of the optical module. The optical fiber array and the lens component are provided with a good optical coupling structure design, multiple paths of converged light from the lens component are incident into multiple paths of optical fibers of the optical fiber array, and the optical structure of the lens component is utilized to realize optical connection with the light emitting chip; multiple paths of light from the optical fiber array are incident into the lens assembly, and optical connection with the light receiving chip is realized by the optical structure of the lens assembly. The optical fiber array and the lens component are in good fixing structure design, and the optical fiber array and the lens component can be relatively fixed, so that the lens component and the circuit board are relatively fixed, and the optical fiber array and the lens component are relatively fixed.

The optical fiber adapter 600 is located at an optical interface formed by the upper and lower shells and is a connecting piece for connecting the optical module with an optical fiber connector (optical fiber) outside the optical module; in addition, in order to connect with an external optical fiber connector, matching structures are often required to be arranged on the upper and lower housings and at the optical interface. Fiber optic adapters are typically of a standard shape and size to facilitate the insertion of external fiber optic connectors/plugs, and have a plurality of fiber optic interfaces therein, including interfaces for outgoing optical signals and interfaces for incoming optical signals. A common fiber optic connector/plug is an MT-style fiber optic connector (e.g., MPO (Multi-fiber pushon) fiber optic jumper connector). The optical fiber connector is inserted into the optical fiber adapter of the optical module, so that optical signals inside the optical module can be transmitted into the external optical fiber, and optical signals outside the optical module can be transmitted into the optical module.

Fig. 5 is a schematic structural diagram of a circuit board, an optical fiber holder, and a lens assembly according to an embodiment of the present disclosure. FIG. 6 is a schematic structural diagram of an optical fiber holder and a lens assembly according to an embodiment of the present disclosure. FIG. 7 is an exploded view of a fiber holder and a lens assembly according to an embodiment of the present disclosure. FIG. 8 is a schematic view of a first angular structure of a fiber optic support according to an embodiment of the present disclosure. FIG. 9 is a second angular configuration of a fiber optic support according to an embodiment of the present disclosure. Fig. 10 is a schematic third angle structure diagram of an optical fiber support according to an embodiment of the present application. FIG. 11 is a plan view of a fiber optic shelf provided in accordance with an embodiment of the present application. Fig. 16 is a schematic diagram of a first angle structure of a lens assembly according to an embodiment of the present application. FIG. 20 is a plan view of a fiber holder and lens assembly according to an embodiment of the present disclosure. As shown in fig. 5-11, 16 and 20, in the embodiment of the present application, the optical module 200 further includes a fiber holder 700. The fiber holder 700 is fixed to the circuit board 300, and the optical fibers 501 of the fiber array 500 are fixed to the inner side. In particular, the method comprises the following steps of,

the optical fiber 501 includes a core layer, a cladding layer, and a protective layer. The protective layer is wrapped on the cladding layer, the cladding layer is wrapped on the core layer, and the optical signal is transmitted in the core layer.

The fiber holder 700 has a first lens 701 formed at an end thereof. Specifically, the end of the fiber holder 700 includes a first side 704 and two second sides 705, where the two second sides 705 are respectively located at two ends of the first side 704, and the second sides 705 are more recessed relative to the first side 704. The first side 704 is provided with a first lens 701.

The first lens 701 is used for converging the parallel light emitted from the lens assembly 400 into a light spot and coupling the light spot into an optical fiber. The first lens 701 can also be used to collimate the optical signal transmitted from the optical fiber 501 into parallel light and inject the parallel light into the lens assembly 400.

And a fiber holder 700 coupled to the lens assembly 400. Specifically, two second side surfaces 705 are provided with two limiting holes 7051, the front end of the lens assembly 400 is provided with two limiting posts 4011, and the two limiting posts 4011 correspond to the two limiting holes 7051 respectively. The two limiting posts 4011 are respectively inserted into the corresponding limiting holes 7051, so that the optical fiber support 700 is connected with the lens assembly 400.

The fiber holder 700 includes a fiber groove 702, a fiber stop 703, a through hole 706, and a surface opening 707.

The fiber groove 702, including the fiber securing slot 7021 and the fiber securing slot 7022, is used to secure the fibers 501 of the fiber array 500. Specifically, the optical fiber fixing groove 7021 has a larger diameter than the optical fiber fixing groove 7022, and is used for fixing a protective layer of the optical fiber 501. The fiber slots 7022 may be used to hold the cladding of the optical fibers 501.

In actual production, the size of the fiber securing groove 7021 is large, and the error of the fiber securing groove 7021 is large. Specifically, in actual production, the diameter of the fiber fixing groove 7021 is 0.126 mm to 0.130mm, and the diameter of the protective layer of the optical fiber 501 is 0.125 ± 0.001mm, so that the optical fiber 501 has a large tilting space in the fiber fixing groove 7021, and the tolerance caused by assembly is 200 μm. For light spots and optical fibers (only comprising a core layer and a cladding layer), the large tilting space can influence the accurate entering of optical signals into the optical fibers, and the actual precision requirement cannot be met.

However, since the size of the cladding of the optical fiber is small, the optical fiber slot 7022 for fixing the cladding of the optical fiber has a small error in actual production. The assembly error between the lens assembly 400 and the optical fiber is 20 μm. But this is only a tenth of that for 200 μm, which is within the tolerable range. Therefore, some sections of the fiber have no protective layer, only the core and cladding.

The protective layer of the optical fiber 501 is fixed in the optical fiber fixing groove 7021; only a portion of the core and cladding of the optical fiber 501 falls into a segment, with the front end placed in the fiber-securing slot 7021 and the end placed in the fiber-securing slot 7022.

Since the diameter of the optical fiber slot 7022 is larger than the diameter of the cladding of the optical fiber 501, in order to fix the cladding of the optical fiber 501 in the optical fiber slot 7022, when the cladding of the optical fiber 501 is inserted into the optical fiber slot 7022 and stops at the optical fiber stop 703, the optical fiber 501 and the optical fiber slot 7022 are bonded by chemical glue.

And the optical fiber stop 703 is positioned between the optical fiber slot 7022 and the first lens 701 and is used for limiting the end face of the optical fiber 501. The end face of the fiber 501 can only stop before the fiber stop 703 and cannot go beyond the fiber stop 703.

The end face of the optical fiber 501 faces the first lens 701. An external optical signal received by the optical fiber 501 is transmitted to the lens assembly 400 through the first lens 701. The optical signal emitted by the lens assembly 400 is coupled into the optical fiber 501 via the first lens 701.

And a through hole 706 at the front end of the fiber holder 700 for inserting the optical fiber 501 of the fiber array 500. The end of the optical fiber 501 is inserted into the through hole 706 and slid along the fiber groove 702 beyond the through hole 706 until the end face of the optical fiber 501 stops at the fiber stop 703.

A surface opening 707 is formed in the surface of the fiber holder 700 to expose the fiber groove 702 for facilitating the injection of glue into the fiber groove 702.

The fiber holder 700 is used to hold not only a single fiber of the fiber array 500, but also a plurality of fibers of the fiber array 500.

Fig. 8-11 illustrate one embodiment of the present application, not the only configuration of the fiber optic support 700. Another structural configuration of the fiber optic shelf 700 is described below.

FIG. 12 is a schematic view of a first angled structure of another fiber optic shelf according to an embodiment of the present disclosure. FIG. 13 is a second angular configuration of another fiber optic support according to an embodiment of the present disclosure. Fig. 14 is a third angle structural diagram of another fiber optic support according to an embodiment of the present disclosure. FIG. 15 is a plan view of another fiber optic shelf according to embodiments of the present application. Fig. 12-15 illustrate another embodiment provided herein. As shown in FIGS. 12-15, in the present embodiment, the fiber optic shelf 700 includes a surface groove 708 in addition to the same first lens 701, fiber groove 702, surface opening 707, and retention aperture 7051 as the fiber optic shelf 700 of FIGS. 8-11. In particular, the method comprises the following steps of,

the surface groove 708 hollows out the fiber optic slot 7022 near the first lens 701 for exposing the fiber optic slot 7022 to facilitate injecting glue into the fiber optic slot 7022.

Fig. 17 is a schematic diagram of a second angular structure of a lens assembly according to an embodiment of the present application. Fig. 18 is a schematic diagram of a third angular structure of a lens assembly according to an embodiment of the present application. FIG. 19 is a planar view of a lens assembly provided in an embodiment of the present application. In the embodiment of the present application, as shown in fig. 5-7 and 16-20, the surface of the lens assembly 400 facing the first lens 701 is a refractive surface 402, the inner surface is provided with the second lens 403 facing the photonic chip, and the outer surface is provided with a reflective surface 404. In particular, the method comprises the following steps of,

the surface of the lens assembly 400 where the limiting pillars 4011 are disposed is a third side surface 401, the third side surface 401 is located at two ends of the refraction surface 402, the refraction surface 402 corresponds to the first side surface 704, and the third side surface 401 corresponds to the second side surface 705. Since the second side 705 of the end of the fiber optic support 700 is more concave relative to the first side 704, the refractive face 402 is more concave relative to the third side 401.

In a conventional optical module, a lens is disposed on a refraction surface, and the lens is a converging lens, so that an optical signal emitted by a lens assembly can be converged into a light spot through the converging lens, and the light spot is coupled to a first lens. Since the spot diameter is 30 μm and the fiber diameter is 200 μm, the spot diameter is far less than that of the fiber and can bear assembly errors. In the embodiment of the present application, the refractive surface 402 is not provided with a lens, so that the optical signal emitted from the lens assembly 400 is emitted into the first lens 701 through the refractive surface 402 in the form of parallel light. The optical signal is transmitted between the lens assembly 400 and the optical fiber holder 700 in a parallel light manner, and the capability of bearing the deviation of the optical signal is strong, so that the optical signal coupled to the center of the optical fiber is increased, and the coupling efficiency is improved.

The inner surface of the lens assembly 400 is provided with a second lens 403 facing the photonic chip. Specifically, a second lens 403 is disposed perpendicular to the inner surface of the lens assembly 400 above the photonic chip. The second lens 403 is a converging lens, and is used for converging the emitted light signal emitted by the optical chip into parallel light vertically upward.

The second lens 403 is also located vertically below the reflective surface 404. The parallel light emitted by the second lens 403 is incident into the emission surface 404.

And a reflective surface 404 disposed on an outer surface of the lens assembly 400. Specifically, the outer surface of lens assembly 400 is recessed inwardly, with the sidewalls of the recess being reflective surfaces 404. The outer surface of the lens assembly 400, corresponding to the inner surface of the lens assembly 400, is perpendicular to the central axis of the first lens 701 of the fiber holder 700.

Fig. 21 is a schematic diagram of a first optical path according to an embodiment of the present application. Fig. 22 is a schematic diagram of a second optical path according to an embodiment of the present application. Fig. 23 is a schematic diagram of a third optical path provided in the embodiment of the present application. Fig. 24 is a schematic diagram of a fourth optical path according to an embodiment of the present application. When the second lens 403, the reflecting surface 404, the refracting surface 402, the first lens 701 and the optical fiber 501 have the following positional or angular relationships, the coupling efficiency of the optical signal can be improved. As shown in the figures 21-24 of the drawings,

(1) when the optical signal emitted by the optical chip is horizontally parallel to the optical signal emitted by the second lens 403, the reflecting surface 404 and the refracting surface 402, the central axis of the first lens 701 coincides with the central axis of the optical fiber 501. The following two cases are specifically distinguished:

as shown in fig. 21, a, the incident angle of the light incident on the reflective surface 404 is 45 °, and the incident angle of the light incident on the refractive surface 402 is 90 °, so that the optical signal emitted from the photonic chip is horizontally parallel light after passing through the second lens 403, the reflective surface 404, and the refractive surface 402.

As shown in fig. 22, B, the incident angle of the light incident on the reflective surface 404 is greater than 45 °, the incident angle of the light incident on the refractive surface 402 is less than 90 °, and the reflective surface 404 and the refractive surface 402 cooperate with each other, so that the optical signal emitted by the optical chip is horizontal parallel light after passing through the second lens 403, the reflective surface 404 and the refractive surface 402.

When the optical signal emitted from the lens assembly 400 is a horizontal parallel light, the central axis of the first lens 701 coincides with the central axis of the optical fiber 501, and then the optical signal emitted from the lens assembly 400 is coupled to the center of the optical fiber 501 through the first lens 701. Specifically, all the horizontal parallel lights vertically enter the first lens 701 and are converged into a light spot under the action of the first lens 701, where the light spot is located on the central axis of the first lens 701 or the central axis of the optical fiber 501. Since the central axis of the first lens 701 coincides with the central axis of the optical fiber 501, the light spot is located in the core layer of the optical fiber 501.

(2) When the optical signal emitted from the optical chip is obliquely parallel to the optical signal emitted from the second lens 403, the reflecting surface 404 and the refracting surface 402, the central axis of the first lens 701 does not coincide with the central axis of the optical fiber 501. The following two cases are specifically distinguished:

as shown in fig. 23, C, the incident angle of the light incident on the reflective surface 404 is 45 °, the incident angle of the light incident on the refractive surface 402 is less than 90 °, and the reflective surface 404 and the refractive surface 402 cooperate with each other, so that the optical signal emitted from the optical chip is oblique parallel light after passing through the second lens 403, the reflective surface 404 and the refractive surface 402.

As shown in fig. 24, D, the incident angle of the light incident on the reflective surface 404 is smaller than 45 °, the incident angle of the light incident on the refractive surface 402 is smaller than 90 °, and the reflective surface 404 and the refractive surface 402 cooperate with each other, so that the optical signal emitted by the optical chip is oblique parallel light after passing through the second lens 403, the reflective surface 404 and the refractive surface 402.

The angle between the oblique parallel light and the refractive surface 402 is determined by the refractive index, the angle of inclination of the refractive surface 402, and the angle of incidence of the light into the reflective surface 404. The specific calculation can be carried out.

The perpendicular distance between the central axis of the first lens 701 and the central axis of the optical fiber may be determined by the focal length of the first lens 701, the angle between the oblique parallel light and the refractive surface 402.

When the optical signal emitted from the lens assembly 400 is oblique parallel light, the central axis of the first lens 701 coincides with the central axis of the optical fiber 501, and the optical signals also emitted from the lens assembly 400 are coupled to the center of the optical fiber through the first lens 701. Specifically, the oblique parallel light obliquely enters the first lens 701 and is converged into a light spot under the action of the first lens 701, and the light spot is located on the central axis of the optical fiber 501. Since the central axis of the first lens 701 and the central axis of the optical fiber 501 do not coincide, the light spot is located in the core layer of the optical fiber 501.

The application provides an optical module, including the circuit board, be fixed in the fiber support on the circuit board and cover lens subassembly of locating on the optical chip. The optical fiber support is fixed with the optical fiber at the inner side, and the tail end of the optical fiber support forms a first lens. The end face of the optical fiber faces the first lens. And the surface of the lens component facing the first lens is a refraction surface, the inner surface of the lens component is provided with a second lens facing the optical chip, and the outer surface of the lens component is provided with a reflection surface. And a refractive surface without a lens. When the optical signal emitted by the optical chip is horizontally parallel light through the second lens, the reflecting surface and the refracting surface, the central axis of the first lens is superposed with the central axis of the optical fiber. When the optical signal emitted by the optical chip through the second lens, the reflecting surface and the refracting surface is oblique parallel light, the central axis of the first lens is not overlapped with the central axis of the optical fiber, and the vertical distance between the central axes of the optical fibers of the central axis of the first lens is determined by the focal length of the first lens and the included angle between the oblique parallel light and the refracting surface. When the optical signal emitted from the lens component is horizontal parallel light, the central axis of the first lens coincides with the central axis of the optical fiber, and then the optical signal emitted from the lens component is coupled to the center of the optical fiber through the first lens. When the optical signal emitted from the lens component is oblique parallel light, the central axis of the first lens is coincident with the central axis of the optical fiber, and the optical signal emitted from the lens component is coupled to the center of the optical fiber through the first lens. In the application, the optical fiber is fixed on the optical fiber support, and the optical fiber does not extend out of the outer side of the optical fiber support, so that the shaking of the optical fiber can be effectively reduced, the optical signal coupled to the center of the optical fiber is increased, and the coupling efficiency is improved; the optical signal is transmitted between the lens component and the optical fiber support in a parallel light mode, and the capability of bearing the deviation of the optical signal is strong, so that the optical signal coupled to the center of the optical fiber is increased, and the coupling efficiency is improved.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application 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 in the embodiments of the present application.

Claims

1. A light module, comprising:

a circuit board;

the optical fiber support is fixed on the circuit board, an optical fiber is fixed on the inner side of the optical fiber support, and the tail end of the optical fiber support is provided with a first lens;

the end face of the optical fiber faces the first lens;

the refraction surface is not provided with a lens;

when the optical signal emitted by the optical chip passes through the second lens, the reflecting surface and the refracting surface and is horizontal parallel light, the central axis of the first lens is superposed with the central axis of the optical fiber;

when the optical signal that the optical chip launched passes through the second lens, the plane of reflection with the light signal that the plane of refraction jetted out is the slope parallel light, the central axis of first lens with the central axis of optic fibre is misaligned, just the central axis of first lens with the perpendicular distance between the central axis of optic fibre is by the focus of first lens, the contained angle between slope parallel light and the plane of refraction decides.

2. The optical module of claim 1, wherein the incident angle of light incident on the reflective surface is 45 ° and the incident angle of light incident on the refractive surface is 90 °, such that the optical signal emitted from the optical chip is a horizontal parallel light.

3. The optical module of claim 1, wherein an incident angle of light incident on the reflective surface is greater than 45 ° and an incident angle of light incident on the refractive surface is less than 90 °, and the reflective surface and the refractive surface cooperate with each other to make an optical signal emitted from the optical chip to be a horizontal parallel light.

4. The optical module according to claim 1, wherein an incident angle of light incident on the reflective surface is 45 ° and an incident angle of light incident on the refractive surface is less than 90 °, and the reflective surface and the refractive surface are matched with each other, so that an optical signal emitted from the optical chip is an oblique parallel light.

5. The optical module of claim 1, wherein an incident angle of light incident on the reflective surface is less than 45 ° and an incident angle of light incident on the refractive surface is less than 90 °, and the reflective surface and the refractive surface cooperate with each other to make an optical signal emitted from the optical chip as an oblique parallel light.

6. The optical module of claim 1, wherein the fiber optic bracket further comprises a fiber groove and a fiber stop;

the optical fiber groove comprises an optical fiber fixing groove and an optical fiber slot and is used for fixing an optical fiber;

the optical fiber slot is positioned between the optical fiber fixing groove and the optical fiber stopping position;

the optical fiber stop is positioned between the optical fiber slot and the first lens.

7. The optical module of claim 1, wherein the second lens is positioned vertically above the optical chip.

8. The optical module of claim 1, wherein a plurality of optical fibers are disposed in the fiber optic support.

9. The optical module of claim 6, wherein the optical fiber is bonded to the fiber optic receptacle by glue.