CN109683333B

CN109683333B - Optical receiver and optical module

Info

Publication number: CN109683333B
Application number: CN201910017021.7A
Authority: CN
Inventors: 冷宝全; 唐永正
Original assignee: Hisense Broadband Multimedia Technology Co Ltd
Current assignee: Hisense Broadband Multimedia Technology Co Ltd
Priority date: 2019-01-08
Filing date: 2019-01-08
Publication date: 2021-12-24
Anticipated expiration: 2039-01-08
Also published as: CN109683333A

Abstract

The application provides an optical receiver and an optical module, and belongs to the technical field of optical communication. The optical receiver includes: an optical multiplexing assembly, a focusing lens array, and a photodetector; the optical multiplexing component divides a beam of incident light into at least two beams of parallel light; the focusing lens array respectively focuses at least two parallel beams of light separated by the light multiplexing component into at least two converging beams of light; the light detector receives the converging light. The light receiver provided by the application has the characteristics of simple coupling operation, and convenience in assembly and maintenance.

Description

Optical receiver and optical module

Technical Field

The present application relates to the field of optical communications technologies, and in particular, to an optical receiver and an optical module.

Background

Optical receivers are an important component in optical communication systems for converting optical signals into electrical signals. Generally, an optical receiver includes a collimating lens, an optical multiplexing assembly, a plurality of focusing lenses, and a plurality of photodetectors. The light multiplexing component converts incident light into multiple paths of parallel light with equal intervals. The focusing lens and the optical detector are in one-to-one correspondence with the parallel light with equal intervals, and each path of parallel light is coupled to the optical detector through the focusing lens so as to carry out photoelectric signal conversion.

In the related art, in order to ensure effective transfer of information, the lens couples parallel light to the photodetector to the maximum extent. When coupling, the positions of a plurality of focusing lenses need to be adjusted respectively to meet the coupling requirement.

The process of respectively debugging the positions of the plurality of focusing lenses has the defects of large workload and complex operation.

Disclosure of Invention

The present application provides an optical receiver and an optical module to solve the deficiencies in the related art.

In a first aspect, an embodiment of the present application provides an optical receiver, including: an optical multiplexing assembly, a focusing lens array, and a photodetector;

the optical multiplexing component divides a beam of incident light into at least two beams of parallel light;

the focusing lens array respectively focuses at least two parallel beams of light separated by the light multiplexing component into at least two converging beams of light;

the light detector receives the converged light.

In a second aspect, an embodiment of the present application provides an optical module, including the optical receiver described in the first aspect.

The technical scheme provided by the application has the following beneficial effects at least:

in the optical receiver used in the embodiments of the present application, the optical multiplexing component splits a beam of incident light into at least two beams of parallel light. The focusing lens array respectively focuses at least two parallel beams of light into at least two converging beams of light. In addition, the light detector in the light receiver receives the converged light to realize the conversion of the photoelectric signal. The optical element of the focusing lens array is adopted to couple the parallel light to the optical detector, so that the workload of debugging the focusing lens array in the coupling process is reduced, the operation is simplified, and the assembly or maintenance efficiency is improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

FIG. 1 is a schematic diagram of an optical path of an optical receiver shown in accordance with an exemplary embodiment;

FIG. 2 is a top view of an optical receiver shown in accordance with an exemplary embodiment;

FIG. 3 is a side cross-sectional view of a light receiver shown in accordance with an exemplary embodiment;

FIG. 4 is a perspective view of a portion of a structure in an optical receiver according to an exemplary embodiment;

FIG. 5 is a perspective view of a photodetector portion of an optical receiver shown in accordance with an exemplary embodiment.

The various references in the drawings mean:

1. an optical multiplexing component;

2. a focusing lens array;

3. a light detector;

41. a housing;

411. an open side;

412. an open end;

42. a cavity;

43. a sealing block;

44. a cover plate;

5. an optical window;

6. a fiber optic adapter;

7. a first carrier;

71. a front end face;

72. a bump;

8. a photodetector carrier;

81. a conductor;

9. a second carrier;

91. a blocking surface;

10. a circuit board;

101. an operational amplifier;

a. incident light; b. parallel light; c. the light is collected.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

In the optical receiver provided in the related art, the optical multiplexing module typically splits 4 equally spaced parallel lights. And, the optical receiver includes 4 focusing lenses and 4 photo-detectors, and the 4 focusing lenses respectively couple 4 equally spaced parallel lights to the 4 photo-detectors. The optical receiver in the related art needs to adjust the position of each focusing lens separately when coupling.

Based on the above, to facilitate the coupling, the positions of the optical multiplexing component and the optical detector are usually fixed under the condition without the light source, and then the position of the focusing lens is adjusted under the condition with the light source. The uncertainty factor in the coupling process is reduced by the fixed position optical multiplexing assembly and the optical detector to adjust the position of the focusing lens.

Further, since the optical multiplexing component is mounted without a light source, there may be a deviation in the mounting angle or position of the optical multiplexing component. These deviations may cause the parallel light split by the optical multiplexing component to have an azimuth deviation from the detector, which is difficult to adjust by the focusing lens, thereby weakening the detection effect. Therefore, in order to correct the possible deviation of the optical multiplexing component, the optical receiver further comprises a collimating lens arranged in front of the optical multiplexing component, and the incident light is collimated by the collimating lens and then enters the optical multiplexing component.

When using the optical receiver provided in the related art, the inventors found that:

first, the optical receiver provided in the related art requires a complicated and time-consuming process of adjusting the focusing lens when coupling.

Secondly, the collimating lens is adopted for collimation, so that the coupling step is added, and the assembly or maintenance efficiency is influenced. Particularly, if the installation deviation of the collimating lens occurs, the detection effect of the optical detector is affected, and the collimating lens and the focusing lens need to be removed simultaneously during maintenance, so that the process is complex.

In view of the above problems, embodiments of the present application provide an optical receiver. FIG. 1 is an optical path diagram of an optical receiver shown in accordance with an exemplary embodiment; fig. 2 to 5 are schematic structural views of the optical receiver, where fig. 2 is a top view, fig. 3 is a cross-sectional view, fig. 4 is a perspective view, and fig. 5 is a partial perspective view.

As shown in fig. 1, an optical receiver provided by an embodiment of the present disclosure includes: an optical multiplexing assembly 1, a focusing lens array 2, and a photodetector 3.

The optical multiplexing component 1 is used for dividing a beam of incident light a into at least two beams of parallel light b. Note that, when the optical multiplexing module 1 splits one incident light beam a into 3 or more parallel light beams b, the 3 or more parallel light beams b are equally spaced.

The focusing lens array 2 is used for focusing the at least two parallel lights b separated by the optical multiplexing component 1 into at least two converging lights c. When the optical multiplexing module 1 splits at least 3 or more parallel lights b at equal intervals, the focusing lens array 2 focuses the 3 or more parallel lights b into an equal number of converged lights c, respectively.

The focusing lens array 2 is an optical element. Illustratively, the focusing lens array 2 includes a substrate and a plurality of lens bodies formed on the substrate. And the plurality of lens bodies are arranged corresponding to the plurality of parallel beams of light b, so that each beam of parallel light b is focused.

The light detector 3 receives the collected light c. The converged light c is projected onto a photosensitive surface of the photodetector 3, and the photodetector 3 converts the received converged light c into an electrical signal. Wherein the optional light receiver comprises at least two light detectors 3, one light detector 3 receiving one of the converging lights c.

Due to the adoption of the focusing lens array 2, the focusing degree of the at least two paths of converging light c can be adjusted by adjusting the position of the focusing lens array 2, so that the at least two paths of converging light c are respectively coupled on the optical detector 3. Compared with the optical receiver provided in the related art, the optical receiver provided by the application simplifies the coupling process and helps to shorten the coupling time.

Moreover, since at least two parallel lights b can be coupled synchronously by the focusing lens array 2, in order to achieve different coupling effects, the optical receiver can be assembled in the following manner:

the light detectors 3 are fixed without a light source and then the relative positions of the optical multiplexing assembly 1 and the focusing lens array 2 are debugged with a light source such that at least two converging lights c are coupled to the photosurfaces of different light detectors 3, respectively.

It should be noted that, in the embodiment of the present application, since the focusing lens array 2 is used to synchronously couple at least two parallel lights b, the position of the optical multiplexing component 1 is not fixed during the coupling process, and thus the workload is not increased.

Further, since the position of the optical multiplexing unit 1 is not fixed, in the embodiment of the present application, it is possible to eliminate a possible azimuth deviation between the collected light c and the light detector 3 by changing the relative positions of the optical multiplexing unit 1 and the focusing lens array 2. In other words, in the optical receiver, the collimator lens is not required. Therefore, the step of installing the collimating lens is omitted, and the coupling process is simplified.

In the embodiment of the application, the coupling process is simplified and the coupling efficiency is improved by changing the composition of the optical receiver; and the coupling effect is flexible, the one-time coupling success rate is improved, and the assembly or repair efficiency of the optical receiver is further improved. Moreover, the optical receiver reduces the number of optical elements and the equipment cost of the optical receiver.

In one embodiment, as shown in fig. 2-4, the light receiver comprises a tube housing formed with a cavity 42, at one end of which is arranged an optical window 5 for incident light into the cavity 42. Wherein the optical multiplexing assembly 1, the focusing lens array 2, and the at least two photodetectors 3 are housed within a cavity 42. The optical multiplexing component 1 is disposed corresponding to the optical window 5 to receive the incident light a.

The cavity 42 is internally provided with a second carrier 9 for bearing the optical multiplexing component 1 and the focusing lens array 2, and the optical multiplexing component 1, the focusing lens array 2 and the optical window 5 are positioned at the same height through the second carrier 9, so that the smoothness of an optical path is ensured. For example, the axes of the optical window 5, the optical multiplexing assembly 1, and the focusing lens array 2 coincide.

The shape of the second carrier 9 is not limited, so as to adjust the relative positions of the optical multiplexing assembly 1 and the focusing lens array 2. Illustratively, as shown in fig. 3, a convex portion and a concave portion are formed on the upper surface of the second carrier 9, the convex portion is used for carrying the optical multiplexing component 1, and the concave portion is used for carrying the focusing lens array 2, so as to compensate the height difference between the optical multiplexing component 1 and the focusing lens array 2.

The optical receiver further comprises a fiber optic adapter 6 connected to the envelope, and the fiber optic adapter 6 is arranged outside the envelope in correspondence with the optical window 5. Generally, the optical receiver is coupled to the optical fiber, specifically, the optical fiber is connected through the optical fiber adapter 6, and the optical signal transmitted by the optical fiber is used as the incident light. The optical fiber adapter 6 corresponds to the optical window 5, so that the incident light is emitted into the cavity 42 through the optical window 5 and then received by the optical multiplexing component 1.

In one embodiment, the cartridge includes a housing 41 formed with a cavity 42. Wherein the second carrier 9 is arranged on the bottom surface of the housing 41. Optionally, the second carrier 9 is of integral construction with the housing 41.

The housing 41 includes an open side 411 communicating with the cavity 42, for example, a top surface of the housing 41 forms the open side 411 or a left or right side surface of the housing 41 forms the open side 411. The adjustment of the relative positions of the light multiplexing assembly 1 and the lens array 2 accommodated in the cavity 42 is facilitated by the open side 411.

The package further comprises a cover plate 44 connected to the open side 411 of the housing 41, the open side 411 being closed off by the cover plate 44. When the coupling is completed, the open side 411 is closed by the cover plate 44 to ensure the safety of the components in the cavity 42.

The cover plate 44 selectively closes off the open side 411. For example, the cover plate 44 is connected to the housing 41 through a slot; alternatively, the cover 44 is hinged to the housing 41, covering the open side 411 of the housing 41 by rotation. When assembled or serviced, the cover plate 44 is unblocked from the open side 411, leaving the interior of the cavity 42 exposed for operation.

In one embodiment, the envelope also has an open end 412 in communication with the cavity 42, the open end 412 being located opposite the optical window 5. Optionally, the housing 41 includes an open end 412, and the open end 412 is adjacent to the open side 411, with different directions of extension.

Typically, the optical receiver further comprises a circuit board connected to the light detector. The circuit board is provided with components such as an operational amplifier, a capacitor and the like so as to transmit the electric signal converted by the optical detector.

In the related art, a circuit board and a package are integrated. Specifically, the package is sealed and the circuit is integrated on the package. Elements such as transimpedance amplifier, electric capacity set up in the body, and the circuit board welding is outside the body, and elements and circuit pass through the circuit intercommunication on the tube with the circuit board.

By adopting the mode, the problem of circuit damage or poor welding is likely to occur when the circuit board is welded, the tube shell is likely to be damaged if components are required to be replaced, and the normal use of the optical receiver is affected under similar conditions.

In order to solve this technical problem, the optical receiver provided in the embodiments of the present application adopts the following scheme.

In one embodiment, the optical receiver further comprises a circuit board 10 mounted with an operational amplifier 101, the optical detector 3 being connected to the operational amplifier 101. The light detector 3 is detachably inserted into the cavity 42 together with the circuit board 10 from the end of the package remote from the light window 5.

Optionally, one end of the package is an open end 412, and the circuit board 10 is inserted into the cavity 42 through the open end 412. Moreover, the optical detector 3 is not directly fixed in the cavity 42, but is always connected to the operational amplifier 101 by being inserted into the cavity 42 together with the circuit board 10.

Compared with the welding of the circuit board 10 and the shell, the circuit board 10 and the shell can be detachably inserted, and the possibility of damaging the circuit board 10 is effectively reduced. Moreover, the plugging mode can replace components such as the operational amplifier 101 and the like under the condition of ensuring the structures of the tube shell, the circuit board and the like to be intact.

In one embodiment, the bottom pad of the circuit board 10 is provided with a first carrier 7, the first carrier 7 also being inserted into the cavity 42 from the open end 412. Usually, the thickness of the circuit board 10 is thin, and the insertion of the circuit board 10 into the cavity 42 is facilitated by the first carrier 7.

The first carrier 7 is also used for arranging the light detector 3. Illustratively, the first carrier 7 includes a front end face 71 facing the cavity 42, and the photodetector 3 is disposed on the front end face 71 in a manner perpendicular to the parallel light b split by the optical multi-component assembly 1. In this way, the light detector 3 is able to directly receive the concentrated light c coupled by the focusing lens array 2.

FIG. 5 is a partial perspective view of a light detector shown in accordance with an exemplary embodiment. Further, as shown in fig. 5, the photodetector 3 is fixed on the photodetector carrier 8. Illustratively, the light detector 3 is arranged on a front end face of the light detector carrier 8, which front end face faces the cavity 42, such that the light detector 3 receives the condensed light c.

And the photodetector carrier 8 is connected to the front end face 71 of the first carrier 7. Also, the photodetector carrier 8 includes a conductor 81 formed on the surface, and the conductor 81 is used to connect the photodetector 3 and the conductor 81 of the operational amplifier 101. Illustratively, the conductor 81 includes a first portion and a second portion that are connected. Wherein the first part is formed on the front end face of the photo detector carrier 8 and the second part is formed on the upper end face of the photo detector carrier 8. In use, the first portion and the photodetector 3, and the second portion and the operational amplifier 101 are connected by gold wires or the like.

The material of the photodetector carrier 8 is not limited, and is, for example, a ceramic carrier. The material of the conductor 81 is not limited, and is, for example, a gold layer plated on the surface of the first carrier 7.

And, optional optical detector carrier 8 is close to the up end setting of first carrier 7, and operational amplifier is close to the tip setting of circuit board 10 to shorten optical detector 3 and operational amplifier 7's distance, shorten the distance of gold thread, in order to ensure the signal quality that passes through gold thread and conductor 81 transmission.

In an embodiment the first carrier 7 comprises a bump 72 protruding from the front face 71 towards the optical window 5. And a blocking surface 91 is provided in the cavity 42. The blocking surface 91 abuts against the projection 72 and limits the circuit board 10 in a direction towards the light window 5.

The size of the circuit board 10 that can extend into the cavity 42 is limited by the blocking surface 91 and the bump 72, and the circuit board 10 and the light detector 3 disposed on the first carrier 7 can keep a safe distance from the lens array 2 and other components in the cavity 42.

Optionally, the front end surface of the bump 72 abuts against the blocking surface 91, and the front end surface of the bump 72 is disposed beyond the light detector 3. The end surface of the second carrier 9 facing the open end 412 in the cavity 42 forms a blocking surface 91.

When the bump 72 abuts against the blocking surface 91, at least the distance between the bump 72 and the blocking surface 91 is longer than the distance between the front end surface of the bump 72 and the light detector 3. On the one hand, it is avoided that the light detector 3 comes into contact with the focusing lens array 2 carried on the second carrier 9 when the circuit board 10 and the light detector 3 are inserted into the cavity 42. On the other hand, a position adjustment space is provided for the focusing lens array 2, and the parallel light b is efficiently coupled to the photodetector 3.

In one embodiment, the package further includes a sealing block 43 at the open end 412, and the sealing block 43 is disposed between the cover plate 44 and the circuit board 10. When the circuit board 10 is inserted in place, the sealing block 43 is used for sealing the gap between the circuit board 10 and the cover plate 44, and the cavity 42 is sealed, so that the circuit board 10 is prevented from being separated from the cavity 42, and the dustproof and waterproof effects are achieved. The material and shape of the sealing block 43 are not particularly limited, and for example, a glue block formed by curing an adhesive may be used as long as the cavity 42 is sealed.

In a second aspect, an embodiment of the present application provides an optical module, which includes the optical receiver provided in the first aspect. Optionally, the light module further comprises a light emitter.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention 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 invention 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.

Claims

1. An optical receiver, comprising: the device comprises a tube shell, an optical multiplexing component, a focusing lens array and a light detector, wherein a cavity is formed in the tube shell;

the cartridge includes: a housing comprising an open end, and open sides adjacent to the open end and extending in different directions; the cover plate is connected with the shell and blocks the open side; and a sealing block disposed at the open end;

the light multiplexing component divides a beam of incident light into at least two beams of parallel light and is arranged in the shell in a position-adjustable manner relative to the shell;

the light detector receives the converging light.

2. The optical receiver of claim 1, wherein the optical multiplexing assembly and the focusing lens array are housed in the cavity;

the optical receiver also comprises a circuit board provided with an operational amplifier, the optical detector is connected with the operational amplifier and is arranged in a mode of being perpendicular to the parallel light, the optical detector and the circuit board are detachably inserted into the cavity, and the sealing block blocks a gap between the circuit board and the cover plate.

3. The optical receiver of claim 2, wherein the bottom pad of the circuit board is provided with a first carrier;

the first carrier includes a front face facing the cavity, the photodetector being disposed on the front face.

4. The optical receiver of claim 3, wherein the optical detector is secured to an optical detector carrier, the optical detector carrier being attached to the front face;

the optical detector carrier comprises a conductor formed on the surface, and the conductor is used for connecting the optical detector and the operational amplifier.

5. The optical receiver of claim 3, wherein the first carrier includes a bump protruding from the front face toward an interior of the cavity;

a blocking surface is arranged in the cavity and abuts against the convex block, and the circuit board is limited in the direction penetrating into the cavity.

6. The optical receiver of claim 5, wherein a second carrier carrying the optical multiplexing assembly and the focusing lens array is disposed within the cavity, the second carrier including the blocking surface.

7. The optical receiver of claim 1, wherein an optical window is disposed at one end of the package for allowing the incident light to enter the cavity, and the optical multiplexing module is disposed corresponding to the optical window.

8. The optical receiver of claim 7, further comprising a fiber optic adapter coupled to the cartridge, the fiber optic adapter disposed external to the cartridge in correspondence with the optical window.

9. An optical module comprising the optical receiver according to any one of claims 1 to 8.