CN112904493B - Optical module - Google Patents
Optical module Download PDFInfo
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- CN112904493B CN112904493B CN201911221071.3A CN201911221071A CN112904493B CN 112904493 B CN112904493 B CN 112904493B CN 201911221071 A CN201911221071 A CN 201911221071A CN 112904493 B CN112904493 B CN 112904493B
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- optical
- lens matrix
- fiber
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- 230000003287 optical effect Effects 0.000 title claims abstract description 189
- 239000011159 matrix material Substances 0.000 claims abstract description 107
- 239000013307 optical fiber Substances 0.000 claims abstract description 83
- 239000000835 fiber Substances 0.000 claims description 44
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 17
- 230000005540 biological transmission Effects 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000004891 communication Methods 0.000 description 7
- 230000002457 bidirectional effect Effects 0.000 description 5
- 230000010365 information processing Effects 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4286—Optical modules with optical power monitoring
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4206—Optical features
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4214—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical element having redirecting reflective means, e.g. mirrors, prisms for deflecting the radiation from horizontal to down- or upward direction toward a device
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
The application provides an optical module, comprising: a circuit board, a light emitter, a light detector, a light receiver, a lens assembly and an optical fiber ribbon; the optical fiber ribbon is connected with the lens component; the top surface of the lens component is provided with a first concave part and a second concave part, the bottom surface of the lens component comprises a first step surface, a second step surface and a third inclined surface, and the side surface of the lens component is provided with a third concave part; the bottom surface of the first concave part forms a first inclined surface, a second inclined surface and a third inclined surface, a reflecting mirror is obliquely arranged in the first concave part, and a cavity is formed among the reflecting mirror, the second inclined surface and the third inclined surface; the bottom surface of the second concave part forms a first reflecting surface; a third lens matrix is arranged on the end face of the third recess; the first step surface is provided with a first lens matrix, the second step surface is provided with a second lens matrix, and a height difference exists between the first step surface and the second step. The optical module provided by the application is convenient for realizing that the light spot at the optical fiber position of the transmitting end and the light spot at the light receiver can reach the best simultaneously.
Description
Technical Field
The application relates to the technical field of optical communication, in particular to an optical module.
Background
The optical module is mainly used for photoelectric and electro-optical conversion, the transmitting end of the optical module converts an electric signal into an optical signal and transmits the optical signal out through an optical fiber, and the receiving end of the optical module converts the received optical signal into an electric signal. The current packaging forms of optical modules mainly include TO (transmitter-output) packaging and COB (Chip on Board) packaging.
In the optical module of COB encapsulation form, light emitter and optical receiver paste respectively on the circuit board, and the lens subassembly cover is established on light emitter and optical receiver, and optical fiber is connected to the lens subassembly, and the optical signal of light emitter transmission is transmitted to the optic fibre after changing the direction through the lens subassembly, and the optical signal is transmitted to the lens subassembly through the optic fibre, is transmitted to the optical receiver after changing the direction through the lens subassembly.
In order to achieve focusing of the light beam emitted by the light emitter and focusing of the light beam received by the light receiver, a lens matrix is generally arranged on the bottom surface of the lens assembly corresponding to the light emitter and the light receiver respectively, and focusing of the light beam emitted by the light emitter and focusing of the light beam received by the light receiver are achieved through the corresponding lens matrix. And the lens component is also provided with a fiber lens matrix which is used for focusing the light beams emitted by the light emitters to enter the optical fibers after passing through the lens component and focusing the light beams transmitted to the lens component through the optical fibers to enter the lens component. Therefore, how to coordinate each lens matrix so that the light spot of the light beam emitted by the light emitter passing through the lens assembly at the optical fiber position and the light spot of the light beam transmitted to the lens assembly through the optical fiber on the light receiver can be simultaneously optimized is a technical problem to be solved by the person skilled in the art.
Disclosure of Invention
The application provides an optical module which is convenient for realizing that the light spot at the optical fiber position of a transmitting end and the light spot at the light receiver can reach the best simultaneously.
The application provides an optical module, comprising:
A circuit board;
the light emitter is arranged on the circuit board and is used for emitting light signals;
The optical detector is arranged on the circuit board and is used for receiving part of optical signals emitted by the optical emitter;
the optical receiver is arranged on the circuit board and is used for receiving optical signals from the outside of the optical module;
the lens component is covered on the light emitter, the light detector and the light receiver and used for changing the propagation direction of the signal light beam;
an optical fiber ribbon for connecting the lens assembly;
the top surface of the lens assembly comprises a first concave part and a second concave part, the bottom surface of the lens assembly comprises a first step surface and a second step surface, and the side surface of the lens assembly comprises a third concave part;
The bottom surface of the second concave part forms a first reflecting surface which is used for reflecting the light beams transmitted to the first reflecting surface from the outside of the optical module;
A first lens matrix is arranged on the first step surface and is used for converging light beams emitted by the light emitters; a second lens matrix is arranged on the second step surface and is used for converging the light beams reflected by the first reflecting surface to the light receiver; a height difference exists between the first step surface and the second step surface;
The bottom surface of the first concave part forms a first inclined surface, a second inclined surface and a third inclined surface, a reflecting mirror is supported on the first inclined surface, and a cavity is formed among the second inclined surface, the third inclined surface and the reflecting mirror; the second inclined plane is used for refracting and reflecting the light beams from the first lens matrix, the reflecting mirror is used for reflecting the light beams refracted by the second inclined plane, and the third inclined plane is used for refracting the light beams reflected by the reflecting mirror;
and a third lens matrix is arranged on the end face of the third concave part and is used for converging the light beams refracted by the third inclined surface to the optical fiber ribbon and converging and transmitting the light beams from the optical fiber ribbon to the first reflecting surface.
In the optical module provided by the application, the height difference exists between the first step surface and the second step surface on the lens component, and the height difference between the first step surface and the second step surface is used as compensation for the distance from the first lens matrix to the light emitting surface of the light emitter and the distance from the second lens matrix to the light receiving surface of the light receiver, so that the mutual restriction of the lens focal length in the first lens matrix and the lens focal length in the second lens matrix is avoided, and the light spot at the optical fiber position of the transmitting end and the light spot at the light receiver can be conveniently realized to achieve the best simultaneously.
In addition, in the optical module provided by the application, the first concave part is arranged on the upper top surface of the lens assembly, the first inclined surface, the second inclined surface and the third inclined surface are formed on the bottom surface of the first concave part, and the reflecting mirror is obliquely arranged in the first concave part, so that the first inclined surface supports the reflecting mirror, and a cavity is formed among the second inclined surface, the third inclined surface and the reflecting mirror. The light beam emitted by the light emitter is divided into two paths through the second inclined plane, one path of light beam is refracted through the second inclined plane and then transmitted to the reflecting mirror, reflected by the reflecting mirror and then reaches the third inclined plane, the light beam is coupled to the optical fiber ribbon in an incidence mode through the third inclined plane and the third lens matrix, the other path of light beam is reflected through the second inclined plane and then enters the light detector, the light detector receives the light beam, the light power parameter is detected, and then the state of the light emitter is monitored.
Drawings
In order to more clearly illustrate the technical solution of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic diagram of the connection relationship of an optical communication terminal;
fig. 2 is a schematic diagram of an optical network unit structure;
fig. 3 is a schematic structural diagram of an optical module according to an embodiment of the present application;
Fig. 4 is an exploded schematic view of an optical module according to an embodiment of the present application;
FIG. 5 is a block diagram of a circuit board according to an embodiment of the present application;
FIG. 6 is a top view of a lens assembly according to an embodiment of the application;
FIG. 7 is a bottom view of a lens assembly according to an embodiment of the application;
FIG. 8 is an end view of a lens assembly according to an embodiment of the application;
FIG. 9 is a partial cross-sectional view of an optical module in accordance with an embodiment of the present application;
FIG. 10 is a partial cross-sectional view of a second embodiment of an optical module;
FIG. 11 is a partial cross-sectional view III of an optical module in an embodiment of the application;
FIG. 12 is an enlarged schematic view of a partial cross-sectional structure at a first recess in accordance with an embodiment of the present application;
FIG. 13 is a schematic diagram of a transmission path structure of an emitted beam in an embodiment of the present application;
FIG. 14 is an enlarged schematic view of a partial cross-sectional structure at a second recess in accordance with an embodiment of the present application;
FIG. 15 is a schematic diagram of a transmission path structure of a received beam in an embodiment of the present application;
FIG. 16 is a schematic diagram of the light path emitted by a light emitter in accordance with an embodiment of the present application;
fig. 17 is a schematic diagram of a receiving optical path of an optical receiver according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
One of the key links of optical fiber communication is the mutual conversion of optical signals and electric signals. The optical fiber communication uses the optical signal carrying information to transmit in the information transmission equipment such as optical fiber/optical waveguide, and the information transmission with low cost and low loss can be realized by utilizing the passive transmission characteristic of the light in the optical fiber/optical waveguide; in order to establish an information connection between an information transmission device such as an optical fiber and an information processing device such as a computer, it is necessary to perform interconversion between an electric signal and an optical signal.
The optical module realizes the function of the mutual conversion of the optical signal and the electric signal in the technical field of optical fiber communication, and the mutual conversion of the optical signal and the electric signal 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 main electrical connection comprises power supply, I2C signals, data signals, grounding and the like; the electrical connection mode realized by the golden finger has become the mainstream connection mode of the optical module industry, and on the basis of the main connection mode, the definition of pins on the golden finger forms various industry protocols/specifications.
Fig. 1 is a schematic diagram of a connection relationship of an optical communication terminal. As shown in fig. 1, the connection of the optical communication terminal mainly includes interconnection among the optical network unit 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 remote 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 remote 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 unit 100 with the optical module 200.
The optical port of the optical module 200 is externally connected to the optical fiber 101, and bidirectional optical signal connection is established with the optical fiber 101; the electrical port of the optical module 200 is externally connected into the optical network terminal 100, and bidirectional electrical signal connection is established with the optical network terminal 100; the method comprises the steps that the mutual conversion of optical signals and electric signals is realized in an optical module, so that information connection is established between an optical fiber and an optical network terminal; specifically, the optical signal from the optical fiber 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.
The optical network terminal is provided with an optical module interface 102, which is used for accessing the optical module 200 and establishing bidirectional electric signal connection with the optical module 200; the optical network terminal is provided with a network cable interface 104 which is used for accessing the network cable 103 and establishing bidirectional electric signal connection with the network cable 103; the optical module 200 and the network cable 103 are connected through the optical network terminal 100, specifically, the optical network terminal transmits signals from the optical module to the network cable, and transmits signals from the network cable to the optical module, and the optical network terminal is used as an upper computer of the optical module to monitor the operation of the optical module.
To this end, the remote server establishes a bidirectional signal transmission channel with the local information processing device through the optical fiber 101, the optical module 200, the optical network unit 100 and the network cable 103.
Common information processing apparatuses include routers, switches, electronic computers, and the like; the optical network unit 100 is an upper computer of the optical module 200, which provides data signals to the optical module 200 and receives data signals from the optical module 200, and is commonly referred to as an optical line terminal.
Fig. 2 is a schematic diagram of an optical network unit structure. As shown in fig. 2, there is a circuit board 105 in the optical network unit 100, and a cage 106 is provided on the surface of the circuit board 105; an electrical connector is arranged in the cage 106 and is used for accessing an optical module electrical port such as a golden finger; the cage 106 is provided with a heat sink 107, and the heat sink 107 has a convex structure such as fins that increase a heat dissipation area.
The optical module 200 is inserted into an optical network unit, in particular an electrical connector in the cage 106, and the optical port of the optical module 200 is connected to the optical fiber 101.
The cage 106 is positioned on the circuit board, and the electrical connectors on the circuit board are wrapped in the cage; the optical module 200 is inserted into the cage, the optical module 200 is fixed by the cage, and heat generated by the optical module 200 is conducted to the cage through the optical module housing and finally diffused through the heat sink 107 on the cage.
Fig. 3 is a schematic structural diagram of an optical module 200 according to an embodiment of the application, and fig. 4 is an exploded structural diagram of the optical module 200 according to an embodiment of the application. As shown in fig. 3 and 4, the optical module 200 provided in the embodiment of the application includes an upper housing 201, a lower housing 202, an unlocking member 203, a circuit board 300 and a lens assembly 400.
The upper case 201 is covered on the lower case 202 to form a packing cavity having two openings, and the outer contour of the packing cavity generally takes the shape of a square body. Specifically, the lower housing 202 includes a main board and two side boards located at two sides of the main board and perpendicular to the main board; the upper shell 201 comprises a cover plate which is covered on two side plates of the upper shell 201 to form a wrapping cavity; the upper case 201 may further include two sidewalls disposed at both sides of the cover plate and perpendicular to the cover plate, and the two sidewalls are combined with the two side plates to realize the covering of the upper case 201 on the lower case 202.
The two openings can be two ends openings (204, 205) in the same direction or two openings in different directions; one opening is an electric port 204, and a golden finger of the circuit board 300 extends out from the electric port 204 and is inserted into an upper computer such as an optical network unit, the other opening is an optical port 205, and is used for connecting an optical transceiver inside the optical module 200 by external optical fiber access, and photoelectric devices such as the circuit board 203 and the optical transceiver are located in a package cavity.
The upper shell 201 and the lower shell 202 are combined to be assembled, so that devices such as a circuit board 300 and the like can be conveniently installed in the shells, and the upper shell 201 and the lower shell 202 form an encapsulation protection shell of the outermost layer of the optical module. The upper shell 201 and the lower shell 202 are generally made of metal materials, so that electromagnetic shielding and heat dissipation are facilitated; the housing of the optical module 200 is not generally formed as an integral structure, so that the positioning component, the heat dissipation and the electromagnetic shielding structure cannot be installed when devices such as a circuit board are assembled, and the production automation is not facilitated.
The unlocking component 203 is located on the outer wall of the lower housing 202, and is used for realizing or releasing the fixed connection between the optical module and the host computer.
The unlocking part 203 is provided with a clamping structure matched with the upper computer cage; pulling the distal end of the unlocking member 203 can relatively move the unlocking member 203 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 structure of the unlocking part 203; by pulling the unlocking part 203, the clamping structure of the unlocking part 203 moves along with the unlocking part, so that the connection relation between the clamping structure and the upper computer is changed, the clamping relation between the optical module and the upper computer is relieved, and the optical module can be pulled out of the cage of the upper computer.
The circuit board 300 is provided with a light emitting chip, a driving chip of the light emitting chip, a light receiving chip, a transimpedance amplifying chip, a limiting amplifying chip, a microprocessor chip and the like, wherein the light emitting chip and the light receiving chip are directly attached to the circuit board of the light module, and the form is called COB package in the industry.
The circuit board 300 connects the electric devices in the optical module together according to the circuit design through circuit wiring so as to realize the electric functions of power supply, electric signal transmission, grounding and the like; while the circuit board 300 also functions as a carrier for the various devices, such as the circuit board carrier lens assembly 400.
The circuit board is generally a hard circuit board, and the hard circuit board can also realize bearing effect due to the relatively hard material of the hard circuit board, for example, the hard circuit board can stably bear chips; the hard circuit board can also be inserted into an electrical connector in the upper computer cage, specifically, a metal pin/golden finger is formed on one side end surface of the hard circuit board for connection with the electrical connector.
Fig. 5 is a schematic structural diagram of a circuit board 300 according to an embodiment of the present application. As shown in fig. 5, a lens assembly 400 is disposed on the circuit board 300, along with an optical transmitter, a laser driving chip, an optical receiver, a clipping amplifying chip, and an optical detector (not shown in the drawings, which are shielded by the lens assembly 400). The lens assembly 400 is disposed above the optical chip in a cover-type manner, and the lens assembly 400 and the circuit board 300 form a cavity for wrapping the optical chip such as the optical transmitter and the optical receiver. The lens assembly 400 is typically a plastic device for transmitting the light beam and changing the direction of the light beam during transmission. Specifically, light emitted by the light emitter enters the optical fiber after being reflected by the lens component, light from the optical fiber enters the light receiver after being reflected by the lens component, and the lens component not only plays a role in sealing the optical chip, but also establishes optical connection between the optical chip and the optical fiber.
High-speed data transmission requires close-distance arrangement between the optical chip and the driving/matching chip, so as to shorten the connection between the chips and reduce the signal loss caused by the connection, and the lens assembly 400 is covered above the optical chip, so that the lens assembly 400 generally covers the optical chip and the driving/matching chip at the same time. The light emitter and the driving chip of the light emitter are arranged in close proximity, and the lens assembly 400 covers the light emitter and the driving chip of the light emitter; the light receiver and the transimpedance amplifying chip are arranged in close proximity, and the lens assembly 400 covers the light receiver and the transimpedance amplifying chip.
In an embodiment of the present application, a ribbon 500 is connectorized to lens assembly 400 and a light beam is output and input through ribbon 500. Optical fiber ribbon 500 includes a plurality of optical fibers therein. Alternatively, ribbon 500 is attached to lens assembly 400 by fiber optic bracket 600, and fiber optic bracket 600 is used to support ribbon 500 and attach lens assembly 400. Alternatively, the optical fibers in the optical fiber ribbon 500 are secured within the fiber optic bracket 600 with the end faces of the optical fibers in the optical fiber ribbon 500 flush with the end faces of the fiber optic bracket 600.
Fig. 6 is a top view of a lens assembly 400 according to an embodiment of the present application. As shown in fig. 6, a first concave portion 401, a second concave portion 402, and a third concave portion 403 are disposed on a lens assembly 400 according to an embodiment of the present application, the first concave portion 401 and the second concave portion 402 are disposed on a top surface of the lens assembly 400 and near a center, and the third concave portion 403 is disposed on a side surface of the lens assembly 400.
The bottom surface of the first recess 401 includes a second inclined surface and a third inclined surface, and the mirror 404 is obliquely disposed in the first recess 401. The mirror 404 is fastened to the second inclined surface and the third inclined surface, and the mirror 404 forms a cavity with the second inclined surface and the third inclined surface. The bottom surface of the second recess 402 forms a first reflective surface 4021.
A third lens matrix 4032 is provided on an end face of the third recess 403. Optionally, a first end surface 4031 is formed in the third recess 403, and a third lens matrix 4032 is disposed on the first end surface 4031. Optionally, the third lens matrix 4032 is formed directly on the first end face 4031. In an embodiment of the present application, the third lens matrix 4032 is formed by a plurality of lenses regularly arranged for focusing from parallel light beams or converting divergent light beams into parallel light beams.
In an embodiment of the present application, third recess 403 is used to connect with an optical fiber ribbon. Preferably, the end face of each fiber in the ribbon is located at the focal point of the corresponding lens in the third lens matrix 4032. Typically, the optical fibers are arranged in columns, and thus the third lens matrix 4032 is a lens matrix comprising a row of lenses. As the beam passes through the lens assembly 400 toward the ribbon, it is focused by the lenses in the third lens matrix 4032 for incidence on the fibers; when the light beam transmitted through the optical fiber ribbon is input to the lens assembly 400, the diverging light beam is converged into parallel light by the third lens matrix 4032, and the light beam converted into parallel light is transmitted inside the lens assembly 400.
Fig. 7 is a bottom view of a lens assembly 400 according to an embodiment of the present application. As shown in fig. 7, the bottom surface of the lens assembly 400 according to the embodiment of the present application forms a first step surface 405 and a second step surface 406. The first step surface 405 is located in a projection area of the first concave portion 401 on the bottom surface of the lens assembly 400, that is, the projection of the first concave portion 401 on the bottom surface of the lens assembly 400 covers the first step surface 405; the second step surface 406 is located in a projection area of the second concave portion 402 on the bottom surface of the lens assembly 400, that is, a projection of the second concave portion 402 on the bottom surface of the lens assembly 400 covers the second step surface 406. Preferably, the first step surface 405 and the second step surface 406 are parallel to the surface of the circuit board 300, respectively. The first step surface 405 and the second step surface 406 have a height difference, that is, the first step surface 405 and the second step surface 406 form a step. Optionally, the first step surface 405 and the second step surface 406 are connected by a step transition surface 408. The step transition surface 408 may be a surface perpendicular to the first step surface 405 and the second step surface 406, or may be a surface non-perpendicular to the first step surface 405 and the second step surface 406.
Further, as shown in fig. 7, a fifth inclined plane 407 is further formed on the bottom surface of the lens assembly 400 according to the embodiment of the present application, and the fifth inclined plane 407 is located at a side edge of the bottom surface 405. Optionally, fifth bevel 407 intersects bottom surface 405. When the lens assembly 400 is fixed to the circuit board 300, the fifth inclined surface 407 is inclined toward the circuit board 300. The fifth bevel 407 is used to set up a fourth lens matrix.
As shown in fig. 7, a first lens matrix 4051 is provided on the first step surface 405, and a second lens matrix 4061 is provided on the second step surface 406. Alternatively, the first lens matrix 4051 is formed directly on the first step surface 405, and the second lens matrix 4061 is formed directly on the second step surface 406. The first lens matrix 4051 and the second lens matrix 4061 are each formed by a plurality of lenses regularly arranged for focusing from parallel light beams or converting divergent light beams into parallel light beams. In an embodiment of the present application, the focal length of the lenses in the first lens matrix 4051 may be the same as or different from the focal length of the lenses in the second lens matrix 4061.
Specific: if the focal length of the lenses in the first lens matrix 4051 is the same as the focal length of the lenses in the second lens matrix 4061, the light emitting surface of the light emitter and the light receiving surface of the light receiver are different in height. It is possible to compensate for the difference in height between the light emitting surface of the light emitter and the light receiving surface of the light receiver by the difference in height between the first step surface 405 and the second step surface 406. If the focal length of the lenses in the first lens matrix 4051 is different from the focal length of the lenses in the second lens matrix 4061, the light emitting surface of the light emitter and the light receiving surface of the light receiver are at the same or different heights. This allows compensating for the difference between the focal length of the lenses in the first lens matrix 4051 and the focal length of the lenses in the second lens matrix 4061 by the difference in height between the first step surface 405 and the second step surface 406. In this way, the selection of various types of transmitters and receivers in the optical module may be facilitated.
Fig. 8 is an end view of a lens assembly 400 according to an embodiment of the present application. As shown in fig. 7 and 8, a second end surface 4033 is further formed in the third recess portion 403, and the second end surface 4033 and the first end surface 4031 have a height difference on the third recess portion 403, so that a groove is formed between the first end surface 4031 and the second end surface 4033, and the third lens matrix 4032 is located in the groove. In particular use, the end faces of the optical fibers in the ribbon are flush with the second end face 4033 and the light beams passing through the third lens matrix 4032 are transmitted in the grooves and then into the optical fibers in the ribbon. Alternatively, the end surfaces of the fiber support are in abutting contact with the second end surface 4033 when the fiber ribbon is attached to the lens assembly 400.
The third recess 403 is provided with a limit post, which is used for fixedly connecting the optical fiber bracket and assisting the optical fiber bracket to find the installation and fixing position. Optionally, the spacing posts include a first spacing post 4034 and a second spacing post 4035, and the first spacing post 4034 and the second spacing post 4035 are disposed on an end surface of the third recess 403. Preferably, the first and second stop posts 4034, 4035 are disposed on the second end face 4033. Specifically, the first limiting post 4034 and the second limiting post 4035 are respectively located on the second end face 4033 near two ends of the first end face 4031, for example, the first limiting post 4034 is located at the left end of the first end face 4031, and the second limiting post 4035 is located at the right end of the second limiting post 4035. Further, when the optical fiber holder is connected to the lens assembly 400, the optical fiber holder is engaged with and connected to the first and second stopper posts 4034 and 4035.
The bottom surface of the third recess 403 includes a fourth step surface 4037, where the fourth step surface 4037 is connected to the second end surface 4033, and the fourth step surface 4037 is used to support the optical fiber support and has a guiding function during the installation of the optical fiber support. The fourth step surface 4037 is provided with a first side surface and a second side surface on both sides. Preferably, the first side and the second side are perpendicular to the fourth step surface 4037. During the fiber support mounting process, the first side surface and the second side surface can assist in limiting, which is helpful to promote the guiding function of the fourth step surface 4037.
The bottom surface of the third recess 403 further includes a third step surface 4036, and the third step surface 4036 is connected to the first end surface 4031. The third step surface 4036 and the fourth step surface 4037 have a height difference in the direction perpendicular to the third recess portion 403, so that when the optical fiber support is connected with the lens assembly 400, the contact area between the optical fiber support and the second end surface 4033 is increased, and the light direct installation stability is ensured to a certain extent.
Further, in the lens assembly 400 provided in the embodiment of the present application, the first side 4038 and the second side 4039 are respectively disposed at the side of the third recess 403, and the lengths of the first side 4038 and the second side 4039 in the end face direction of the third recess 403 are smaller than the length of the third recess 403 in the end face direction. The first side 4038 and the second side 4039 are both inclined from the outer side of the third recess 403 to the center of the third recess 403, so that the opening area of the top surface of the third recess 403 is increased by the first side 4038 and the second side 4039, and the installation of the optical fiber bracket is more convenient on the basis that the installation firmness of the optical fiber bracket is not affected.
In an embodiment of the present application, the third lens matrix 4032 includes a first fiber lens 4032-1 and a second fiber lens 4032-2. The first fiber lens 4032-1 is used for focusing and transmitting the parallel light beam transmitted through the lens assembly 400 emitted by the light emitter to the optical fiber ribbon, and the second fiber lens 4032-2 is used for converting the divergent light beam transmitted in the optical fiber ribbon into the parallel light beam and transmitting in the lens assembly 400. Preferably, the focal lengths of the first fiber lens 4032-1 and the second fiber lens 4032-2 are the same.
Alternatively, the lens assembly 400 is a transparent plastic piece, typically manufactured by an injection molding process. The first, second and third recesses 401, 402 and 403 may be regarded as grooves formed by the lens assembly 400 through machining.
Fig. 9 is a partial sectional view of a first optical module according to an embodiment of the present application, fig. 10 is a partial sectional view of a second optical module according to an embodiment of the present application, and fig. 11 is a partial sectional view of a third optical module according to an embodiment of the present application. As shown in fig. 9-11, the optical transmitter 301 and the optical receiver 303 are positioned below the lens assembly 400, and the lens assembly 400 is covered on the optical transmitter 301 and the optical receiver 303. As shown in fig. 9-11, a first step surface 405 is located above the optical transmitter 301, a second step surface 406 is located above the optical receiver 303, and a height difference exists between the first step surface 405 and the second step surface 406.
Fig. 12 is an enlarged schematic view of a partial cross-sectional structure of the optical module at the position of the first recess 401. As shown in fig. 12, the second inclined surface 4011 and the third inclined surface 4012 on the bottom surface of the first recess 401 are formed by sinking the first recess 401 in the bottom surface direction of the lens assembly 400; when the reflecting mirror 404 is arranged in the first concave part 401, the reflecting mirror 404 is covered on the second inclined plane 4011 and the third inclined plane 4012; the second bevel 4011, the third bevel 4012 and the mirror 404 form a cavity. Mirror 404 is an optical device for reflecting a light beam incident thereto. Typically, the mirror 404 is made of a transparent plastic or glass planar coated reflective film.
Optionally in an embodiment of the present application, the second bevel 4011 and the third bevel 4012 meet. As shown in fig. 12, the bottom surface of the first recess 401 further includes a first inclined surface 4013, and the first inclined surface 4013 is used for supporting the supporting mirror 404. Optionally, a first bevel 4013 is located at an end of the second bevel 4011, the first bevel 4013 fixedly supporting an end of the mirror 404. Further, the bottom surface of the first recess 401 further includes a fourth inclined surface 4014, and the fourth inclined surface 4014 is also used for supporting the supporting mirror 404. Optionally, a fourth bevel 4014 is located at an end of the third bevel 4012, the fourth bevel 4014 fixedly supporting the other end of the mirror 404. As such, the first slope 4013 and the fourth slope 4014 serve to jointly support the connection mirror 404, increasing the support firmness of the mirror 404.
As shown in fig. 12, the projection of the first step surface 405 onto the circuit board 300 covers the light emitters 301, and a first lens matrix 4051 is provided on the first step surface 405. In an embodiment of the present application, the first lens matrix 4051 is formed by a plurality of lenses regularly arranged. Preferably, the first lens matrix 4051 is a lens matrix comprising a row of lenses, the optical axes of the lenses in the first lens matrix 4051 being perpendicular to the light emitting surface of the light emitter 301. The light beam emitted by the light emitter 301 is incident on the first lens matrix 4051, and the first lens matrix 4051 converts the divergent light beam emitted by the light emitter 301 into a parallel light beam. Optionally, the first lens matrix 4051 is formed directly on the first step surface 405. Preferably, when the lens assembly 400 is assembled on the circuit board 300, the focal points of the lenses in the first lens matrix 4051 are located on the light emitting face of the light emitter 301.
As shown in fig. 12, the fifth inclined surface 407 is located at a side of the first step surface 405, and the fifth inclined surface 407 intersects the first step surface 405. When the lens assembly 400 is fixed to the circuit board 300, the fifth inclined plane 407 faces the circuit board 300 and faces the photo detector 302 for refracting the light beam transmitted to the fifth inclined plane 407 to be transmitted to the photo detector 302. Preferably, the fourth lens matrix 4071 is disposed on the fifth bevel 407. In an embodiment of the present application, the fourth lens matrix 4071 is formed by regularly arranging a plurality of lenses. Preferably, the fourth lens matrix 4071 is a lens matrix comprising a row of lenses, the optical axes of the lenses in the fourth lens matrix 4071 passing through the light receiving surface of the light detector 302. The light beam emitted by the light emitter 301 is reflected to the fifth inclined plane 407 by the lens assembly 400, and the fourth lens matrix 4071 converges and transmits the light beam transmitted in parallel to the fifth inclined plane 407 to the light detector 302.
The light emitter 301 is connected with a power supply circuit and a signal circuit on the circuit board 300, and emits an optical signal according to the electrical signal, so as to realize conversion from the electrical signal to the optical signal in the optical module. Optionally, the light emitter 301 is mounted on the circuit board 300. In an embodiment of the present application, the light emitter 301 may be a light emitting chip, such as a laser chip.
The light detector 302 is connected to a power supply circuit and a signal circuit on the circuit board 300, and the light receiving surface of the light detector 302 receives a part of the light signal emitted by the light emitter 301 reflected by the lens assembly 400, converts the received light signal into an electrical signal, and transmits the electrical signal to the signal circuit for monitoring the status of the light emitter. Specifically, the monitoring of the state of the optical transmitter 301 is achieved by detecting the optical power parameter of the light beam received by the optical transmitter. In an embodiment of the present application, the light detector 302 may be a photodiode chip.
Fig. 13 is a schematic diagram of the transmission optical path structure of the light beam emitted from the light emitter 301. As shown in fig. 13, the light emitter 301 emits a divergent light beam to the first lens matrix 4051, and the first lens matrix 4051 converts the divergent light beam into a parallel light beam; the parallel light beam is transmitted to the second inclined plane 4011 inside the lens assembly 400, and a part of the parallel light beam transmitted to the second inclined plane 4011 is refracted into a cavity formed by the second inclined plane 4011, the third inclined plane 4012 and the reflecting mirror 404, and the other part is reflected by the second inclined plane 4011, namely the parallel light beam incident to the second inclined plane 4011 is split into two paths; the light beam refracted into the cavity formed by the second inclined plane 4011, the third inclined plane 4012 and the reflecting mirror 404 is transmitted to the reflecting mirror 404, the reflecting mirror 404 reflects the light beam to transmit to the third inclined plane 4012, is refracted by the third inclined plane 4012, is incident into the lens assembly 400, and then transmitted to the first end face 4031, and the first fiber lenses 4032-1 in the third lens matrix 4032 on the first end face 4031 refractively converge and transmit the parallel light transmitted thereto to the fiber ribbon 500; the light beam reflected by the second inclined surface 4011 is transmitted to the fifth inclined surface 407, and the fourth lens matrix 4071 on the fifth inclined surface 407 transmits the parallel light transmitted thereto to the light receiving surface of the light detector 302 in a converging manner.
Fig. 14 is an enlarged schematic view of a partial cross-sectional structure of the optical module at the position of the second recess 402. As shown in fig. 14, the lens assembly 400 forms a first reflection surface 4021 at a bottom surface position of the second recess 402, and the first reflection surface 4021 is inclined toward the second step surface 406. The first reflection surface 4021 is configured to reflect a light beam transmitted thereto. Alternatively, a reflective film is formed on the first reflective surface 4021.
As shown in fig. 14, the projection of the second step surface 406 onto the circuit board 300 covers the light receiver 303, and the second lens matrix 4061 is provided on the second step surface 406. In an embodiment of the present application, the second lens matrix 4061 is formed by a plurality of lenses regularly arranged. Preferably, the second lens matrix 4061 is a lens matrix including a row of lenses, and the optical axes of the lenses in the second lens matrix 4061 are perpendicular to the light receiving surface of the light receiver 303. The light beam reflected by the first reflection surface 4021 is incident to the second lens matrix 4061, and the second lens matrix 4061 converges the parallel light beam incident thereto to the light receiving surface of the light receiver 303. Optionally, the second lens matrix 4061 is formed directly on the second step surface 406. Preferably, when the lens assembly 400 is assembled on the circuit board 300, the focal point of the lens in the second lens matrix 4061 is located on the light receiving surface of the light receiver 303.
Fig. 15 is a schematic diagram of a transmission optical path structure of the light beam received by the light receiver 303. As shown in fig. 15, the light beam output from the optical fiber ribbon 500 is transmitted to the second optical fiber lens 4032-2 in the third lens matrix 4032, the light beam output from the optical fiber ribbon 500 is divergent light, the divergent light is refracted, converged and converted into parallel light by the second optical fiber lens 4032-2, the parallel light is transmitted to the first reflective surface 4021, the first reflective surface 4021 reflects the parallel light, the light beam reflected by the first reflective surface 4021 is transmitted to the second step surface 406, and the parallel light transmitted thereto is refracted, converged and transmitted to the light receiving surface of the light receiver 303 by the second lens matrix 4061 on the second step surface 406.
The light receiver 303 is connected to a power supply circuit and a signal circuit on the circuit board 300, and the light receiver 303 is configured to receive an optical signal from outside the optical module and generate an electrical signal. When the light receiving surface of the light receiver 303 receives the light signal incident through the optical fiber ribbon 500, the received light signal is converted into an electrical signal and the electrical signal is output through the signal circuit, so that the conversion between the light signal to the electrical signal in the optical module is realized. In the embodiment of the present application, the light receiver 303 may be a light receiving chip such as a photodiode chip.
Fig. 16 is a schematic diagram of a light path emitted by the light emitter, and fig. 17 is a schematic diagram of a light path received by the light receiver. As shown in fig. 16 and 17, the end face of the optical fiber in the optical fiber ribbon 500 is located at the focal position of the lens in the third lens matrix 4032, the focal length of the lens in the third lens matrix 4032 is denoted as f fiber, the optical transmitter 301 is located at the focal position of the lens in the first lens matrix 4051, the focal length of the lens in the first lens matrix 4051 is denoted as f TX, and the spot diameter size at the optical fiber position is denoted as S 0. As shown in fig. 16, the light emission diameter size S 1 of the light emitter 301 in the emission light path is related to S 0/S1＝ffiber/fTX (1). As shown in fig. 17, in the receiving optical path, the light receiver 303 is located at the focal position of the lens in the second lens matrix 4061, and the focal length of the lens in the second lens matrix 4061 is denoted as f RX. When the optical fibers of the fiber optic ribbon 500 are filled with light, the spot size at the fiber location is the diameter of the optical fibers. Assuming that the diameter of the optical fiber is 50 μm, the relationship between the spot at the optical fiber position and the spot S 2 of the received light at the light receiver 303 is 50/S 2＝ffiber/fRX (2).
If the first lens matrix 4051 and the second lens matrix 4061 are on the same plane, when the heights of the optical transmitter 301 and the optical receiver 303 are very small, f TX≈fRX can be assumed, and S 0·S2 =1000 can be obtained by the relationships (1) and (2), so that the light spot at the optical fiber position and the light spot size of the light received by the optical receiver 303 are in inverse proportion, and are mutually restricted, the purpose of smaller light spot cannot be achieved at the same time, and only one compromise size can be taken, so that both light spots meet the use requirement. If the effective light receiving area of the light receiver is large, typically about 60 μm in the 10G product, the receiving light spot at the light receiver 303 may be appropriately large, for example, about 40 μm; however, in the 25G/100G product, the effective light receiving area of the light receiver 303 is small, typically only about 40 μm, and the received light spot at the light receiver 303 is required to be only about 20 μm. If the spot size is large, the difficulty of the patch process and the optical fiber coupling will increase and the efficiency will be low.
In the optical module provided by the application, in order to effectively solve the problem that S 0 and S 2 are mutually restricted, a height difference is arranged between the first step surface 406 where the first lens matrix 4051 is located and the second step surface 406 where the second lens matrix 4061 is located, that is, the first step surface 405 and the second step surface 406 form a step with a certain height, and the height of the step is used as compensation for the distance between the second lens matrix 4061 and the optical receiver, so that f TX、fRX with different sizes can be designed to obtain ideal S 0、S2, and the optical transmitter and the optical receiver with different heights can be used when the heights of the optical transmitter and the optical receiver with the same focal length are met, or the optical transmitter and the optical receiver with different heights can be compatible.
The calculation of the height difference between the first step surface and the second step surface in the practice of the present application is given below:
The range of f fiber、fTX is first determined, the numerical aperture na=0.2 of the fiber, and according to the geometrical relationship, 2·f fiber ·na is equal to or less than D, i.e. f fiber is equal to or less than 0.625mm. Similarly, the divergence angle θ=13° of the laser is 2·f TX ·tan θ+.ltoreq.d, i.e. f TX +.ltoreq.0.541 mm, according to the geometrical relationship. Secondly, comprehensively considering the optical fiber coupling efficiency and the distance relation between the lenses and the light emitters in the first lens matrix, substituting the S 0、fTX with reasonable design into the relation (1) can calculate f fiber, and ensuring that f TX and f fiber are in respective ranges.
And substituting S 2、ffiber into the relation (2) to obtain f RX. In addition, as the light receiver is connected with the pad bit wire bonding, the arc height of the wire bonding is 0.12mm, so that f RX is more than or equal to 0.12mm, and the gold wire is prevented from touching the surface of the lens in the second lens matrix to influence the optical performance of the lens in the second lens matrix. Let the vertical distance between the lens plane and the light receiver in the first lens matrix be H, then the height Δh=h-f RX of the height difference between the first step surface and the second step surface.
Therefore, in the optical module provided by the application, the height difference exists between the first step surface 405 and the second step surface 406 on the lens assembly 400, and the height difference between the first step surface 405 and the second step surface 406 is used as compensation for the distance from the light emitting surface of the first lens matrix 4051 to the light emitter 301 and the distance from the second lens matrix 4061 to the light receiving surface of the light receiver 303, so that the mutual restriction of the focal length of the lens in the first lens matrix 4051 and the focal length of the lens in the second lens matrix 4061 is avoided, and the optical spot at the optical fiber position in the optical fiber ribbon at the transmitting end and the optical spot at the light receiver 303 can be conveniently realized to be optimal.
In the present specification, each embodiment is described in a progressive manner, and the same and similar parts of each embodiment are referred to each other, and each embodiment mainly describes differences from other embodiments, and relevant parts refer to part descriptions of method embodiments. It is noted that other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It is to be understood that the application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (10)
1. An optical module, comprising:
A circuit board;
the light emitter is arranged on the circuit board and is used for emitting light signals;
The optical detector is arranged on the circuit board and is used for receiving part of optical signals emitted by the optical emitter;
the optical receiver is arranged on the circuit board and is used for receiving optical signals from the outside of the optical module;
the lens component is covered on the light emitter, the light detector and the light receiver and used for changing the propagation direction of the signal light beam;
an optical fiber ribbon for connecting the lens assembly;
the top surface of the lens assembly comprises a first concave part and a second concave part, the bottom surface of the lens assembly comprises a first step surface and a second step surface, and the side surface of the lens assembly comprises a third concave part;
The bottom surface of the second concave part forms a first reflecting surface which is used for reflecting the light beams transmitted to the first reflecting surface from the outside of the optical module;
A first lens matrix is arranged on the first step surface and is used for converging light beams emitted by the light emitters; a second lens matrix is arranged on the second step surface and is used for converging the light beams reflected by the first reflecting surface to the light receiver; a height difference exists between the first step surface and the second step surface;
The bottom surface of the first concave part forms a first inclined surface, a second inclined surface and a third inclined surface, a reflecting mirror is supported on the first inclined surface, and a cavity is formed among the second inclined surface, the third inclined surface and the reflecting mirror; the second inclined plane is used for refracting and reflecting the light beams from the first lens matrix, the reflecting mirror is used for reflecting the light beams refracted by the second inclined plane, and the third inclined plane is used for refracting the light beams reflected by the reflecting mirror;
and a third lens matrix is arranged on the end face of the third concave part and is used for converging the light beams refracted by the third inclined surface to the optical fiber ribbon and converging and transmitting the light beams from the optical fiber ribbon to the first reflecting surface.
2. The light module of claim 1 wherein the focal length of the lenses in the first lens matrix and the focal length of the lenses in the second lens matrix are different, and wherein the light emitting surface of the light emitter and the light receiving surface of the light receiver are the same height.
3. The light module of claim 1 wherein the focal length of the lenses in the first lens matrix and the focal length of the lenses in the second lens matrix are the same, and wherein the light emitting surface of the light emitter and the light receiving surface of the light receiver are different in height.
4. The light module of claim 1 wherein the focal length of the lenses in the first lens matrix and the focal length of the lenses in the second lens matrix are different, and wherein the light emitting surface of the light emitter and the light receiving surface of the light receiver are different in height.
5. The optical module of claim 1, wherein the bottom surface of the lens assembly includes a fifth inclined surface on which a fourth lens matrix is disposed, and wherein the light beam reflected by the second inclined surface is transmitted to the fifth inclined surface and then converged to the light detector by the fourth lens matrix.
6. The light module of claim 1 wherein the third recess comprises a first end face and a second end face, the second end face having a height differential from the first end face;
The third lens matrix is arranged on the first end face, a first limit column and a second limit column are arranged on the second end face, the first limit column is located at one end of the first end face, and the second limit column is located at the other end of the first end face.
7. The optical module of claim 6, further comprising a fiber optic bracket supporting the optical fiber ribbon, the fiber optic bracket clamping the first and second spacing posts, the optical fiber ribbon being coupled to the lens assembly through the fiber optic bracket.
8. The optical module of claim 7, wherein the third recess includes a third step surface and a fourth step surface, the third step surface interfacing with the first end surface and the fourth step surface interfacing with the second end surface, the fourth step surface for supporting the fiber support.
9. The optical module of claim 1 wherein the focal point of the third lens matrix is located at an end face of an optical fiber in the optical fiber ribbon.
10. The optical module of claim 1, wherein the third lens matrix comprises a first fiber lens and a second fiber lens, the first fiber lens and the second fiber lens having the same focal length, the first fiber lens converging and coupling the light beam refracted through the third bevel to the fiber optic ribbon, the second fiber lens converging and transmitting the light beam from the fiber optic ribbon to the first reflective surface.
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| PCT/CN2020/112738 WO2021109645A1 (en) | 2019-12-03 | 2020-08-31 | Optical module |
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| CN107247315B (en) * | 2017-07-24 | 2020-04-14 | 广东海信宽带科技有限公司 | Optical module |
| CN108776373A (en) * | 2018-06-21 | 2018-11-09 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| CN208795882U (en) * | 2018-09-10 | 2019-04-26 | 广东瑞谷光网通信股份有限公司 | A kind of glue envelope incorporated light transceiving device |
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