CN110275252B

CN110275252B - Optical transceiver module

Info

Publication number: CN110275252B
Application number: CN201810203277.2A
Authority: CN
Inventors: 胡荣平; 吉勇; 孙涛; 程进; 龚声福; 谢光明
Original assignee: OPLINK COMMUNICATIONS Inc; Zhuhai FTZ Oplink Communications Inc
Current assignee: OPLINK COMMUNICATIONS Inc; Zhuhai FTZ Oplink Communications Inc
Priority date: 2018-03-13
Filing date: 2018-03-13
Publication date: 2023-06-30
Anticipated expiration: 2038-03-13
Also published as: CN110275252A

Abstract

An optical transceiver module comprises an optical receiving component and an optical transmitting component. The light receiving assembly includes: the optical fiber socket for receiving the signal light is provided with a receiving end, an emitting end and an optical fiber of a connecting section, wherein the receiving end is fixed to the optical fiber socket, the emitting end is provided with a reflecting inclined plane, and a shell with a containing cavity. The connecting section and the emergent end of the optical fiber extend into the accommodating cavity, a fixing seat and a circuit board are arranged in the accommodating cavity, the fixing seat is provided with a fixing groove, and the connecting section of the optical fiber is correspondingly fixed in the fixing groove. The circuit board is provided with a light detector and an amplifier, the light detector is arranged below the emergent end of the optical fiber, and the optical fiber socket and the shell are flexibly connected together by the optical fiber. The signal light input from the receiving end of the optical fiber is reflected by the reflecting inclined plane of the optical fiber, enters the optical detector to be converted into an electric signal, and the electric signal is amplified by the amplifier and then is output outwards. The invention is beneficial to reducing the insertion loss and return loss of the signal light and improving the transmission rate.

Description

Optical transceiver module

Technical Field

The present invention relates to an optical receiving assembly, and more particularly, to an optical receiving assembly suitable for an optical transceiver module and beneficial to improving signal transmission quality.

Background

Chinese patent CN201410466751.2 discloses a light receiving subassembly comprising: a housing; a base plate arranged in the shell; the optical fiber socket is arranged on one side surface of the shell and comprises a first end and a second end, wherein the first end is used for receiving an optical fiber which is used for transmitting a first light beam and guiding the first light beam to the second end; a lens disposed in the housing and adjacent to the second end; a plurality of light sensing elements arranged on the substrate; the optical waveguide element is arranged on the substrate and is positioned between the lens and the light sensing elements, the optical waveguide element comprises an input end and a plurality of output ends, the lens is used for focusing the first light beam output from the second end on the input end, the optical waveguide element is used for dispersing the first light beam received by the input end into a plurality of second light beams according to the wavelength of the first light beam received by the input end, and the second light beams are output from the second ends in a dispersed manner and are output from the output ends, and the output ends are positioned above the light sensing elements; the lens array is arranged above the light sensing elements and is adjacent to the light waveguide element, and comprises at least one incident end, a reflecting surface and at least one emergent end, wherein each incident end is aligned with one of the output ends of the light waveguide element, each emergent end is aligned with one of the light sensing elements, and the reflecting surface is used for enabling the second light beams entering from the incident end to turn towards the emergent end; the lens array further comprises an incidence lens arranged at one of the incidence ends, and the incidence lens is used for receiving the second light beam output by one of the output ends so as to focus the second light beam to the reflecting surface; the lens array further comprises an emergent lens arranged at one of the emergent ends, and the emergent lens is used for focusing the second light beam reflected by the reflecting surface to one of the light sensing elements. The optical receiving subassembly structure needs to be introduced with a lens, an optical waveguide element and a lens array, and a signal beam input from an optical fiber socket can reach an optical sensing element after being coupled for many times, so that the insertion loss and return loss of the signal beam are increased, and the quality of signal transmission is not improved.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, and provides an optical receiving assembly which is beneficial to simplifying the manufacturing process, reducing the insertion loss and return loss of signal light and improving the transmission rate.

The present invention provides a light receiving assembly for solving the above technical problems, including:

the optical fiber socket is used for receiving a signal light;

an optical fiber having a receiving end, an emitting end and a connecting section between the receiving end and the emitting end, the receiving end being fixed to the optical fiber receptacle, the emitting end having a reflecting slope;

the shell is provided with a containing cavity, the connecting section and the emergent end of the optical fiber extend into the containing cavity, and a fixing seat and a circuit board are arranged in the containing cavity; the fixing seat is provided with a fixing groove, and the connecting section of the optical fiber is correspondingly fixed in the fixing groove; the circuit board is provided with a light detector and an amplifier, and the light detector is arranged below the emergent end of the optical fiber;

the signal light input from the receiving end of the optical fiber is reflected by the reflecting inclined plane of the optical fiber, enters the optical detector to be converted into an electric signal, and the electric signal is amplified by the amplifier and then is output outwards.

The present invention also provides an optical transceiver module aiming at the technical problems, comprising: the light emitting device comprises a base, a cover body, a butt joint circuit board which is arranged in a space enclosed by the base and the cover body and extends outwards, a light emitting component welded with the butt joint circuit board and a light receiving component.

Compared with the prior art, the light receiving assembly transmits the signal light by skillfully adopting the optical fiber connected between the optical fiber socket and the shell, and the reflecting inclined plane at the emergent end of the optical fiber is utilized to directly reflect the signal light to the light detector below, so that the light receiving assembly is beneficial to simplifying the manufacturing process, reducing the insertion loss and return loss of the signal light and improving the transmission rate.

Drawings

Fig. 1 is a combined perspective view of a preferred embodiment of an optical transceiver module according to the present invention.

Fig. 2 is an exploded perspective view of fig. 1.

Fig. 3 and 4 are perspective views of a light receiving assembly according to a preferred embodiment of the present invention, with the top cover of the light receiving assembly removed, from two different viewing angles.

Fig. 5 is a partial enlarged view of the area a in fig. 4.

Fig. 6, 7 and 8 are exploded perspective views of three different viewing angles of a preferred embodiment of the light receiving assembly of the present invention.

Fig. 9 is a partial enlarged view of the region C in fig. 8.

Wherein reference numerals are as follows: 100 optical transceiver module 10 optical receiving module 20 optical transmitting module 202 second optical fiber socket 204 second housing 30 cover 40 base 50 butt-joint circuit board 1 optical fiber socket 2 optical fiber 3 housing 32 opening 34 perforation 39 accommodates cavity 4 fixing base 42 fixed slot 5 circuit board 51 base plate 52 ceramic base 6 optical detector 7 amplifier 8 flexible circuit board 82 weld pad 9 optical fiber protective sleeve.

Detailed Description

While this invention is susceptible of embodiment in different forms, there is shown in the drawings and will herein be described in detail, specific embodiments thereof with the understanding that the present disclosure is to be considered as an exemplification of the principles of the invention and is not intended to limit the invention to that as illustrated.

Thus, rather than implying that each embodiment of the present invention must have the characteristics described, one of the characteristics indicated in this specification will be used to describe one embodiment of the present invention. Furthermore, it should be noted that the present specification describes a number of features. Although certain features may be combined together to illustrate a possible system design, such features may be used in other combinations not explicitly described. Thus, unless otherwise indicated, the illustrated combinations are not intended to be limiting.

In the embodiments shown in the drawings, indications of orientation (such as up, down, left, right, front and rear) are used to explain the structure and movement of the various elements of the invention are not absolute but relative. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the description of the position of these elements changes, the indication of these directions changes accordingly.

Preferred embodiments of the present invention will be further elaborated below in conjunction with the drawings of the present specification.

Referring to fig. 1 and 2, the present invention provides an optical transceiver module 100, and the optical transceiver module 100 can be suitable for 100G optical signal transmission. The optical transceiver module 100 includes: a base 40, a cover 30, a docking circuit board 50 mounted in a space enclosed by the base 40 and the cover 30 and extending outward, and a light emitting assembly (TOSA) 20 and a light receiving assembly (ROSA) 10 soldered on the docking circuit board 50. Wherein the light emitting element 20 is used for emitting a signal light, and the light receiving element 10 is used for receiving a signal light.

Referring to fig. 3 to 9 in combination, the present invention proposes a light receiving assembly 10, the light receiving assembly 10 comprising: a fiber socket 1, a fiber 2, a housing 3 connected with the fiber socket 1 through the fiber 2, a fixing seat 4 and a circuit board 5 installed in the housing 3, and a photodetector 6 and an amplifier 7 installed on the circuit board 5.

Referring to fig. 6, the optical fiber 2 has a receiving end 21, an emitting end 23, and a connecting section 25 between the receiving end 21 and the emitting end 23, and an optical fiber protecting jacket 9 is provided around the optical fiber 2 to protect the optical fiber 2 from damage. The receiving end 21 is fixed with the fiber optic receptacle 1, and is configured to receive a signal light.

Referring to fig. 4 and 5, the housing 3 has a rectangular shape, and a receiving chamber 39 is formed at the center thereof, wherein a top cover for closing the receiving chamber 39 is removed to show the configuration of the inside thereof. Referring to fig. 6 and 7, the rear end of the housing 3 is formed with an opening 32, and the front end of the housing 3 is formed with a through hole 34. The circuit board 5 is inserted into the housing chamber 39 from the rear direction of the opening 32. The exit end 23 and the connecting section 25 of the optical fiber 2 extend into the receiving cavity 39 of the housing 3. The connecting section 25 is supported by a fixing slot 42 provided in the fixing seat 4 in the receiving cavity 39. The fixing groove 42 is horizontally formed on the top surface of the fixing base 4, and has a V-shaped structure extending in the front-rear direction. The connecting section 25 is preferably glued into the fixing groove 42 using glue, such as epoxy glue. This fixation facilitates a horizontally extending arrangement of the exit end 23 of the optical fiber 2.

Referring to fig. 5 and 9, the exit end 23 is provided with a reflective bevel 231. The reflecting inclined plane 231 preferably forms an angle of 45 degrees with the axial direction of the optical fiber 2. After being reflected by the reflecting inclined plane 231, the signal light input from the receiving end 21 enters the light detector 6 below the emergent end 23 to be converted into an electric signal, and the electric signal is amplified by the amplifier 7 and then is output to the butt joint circuit board 50 through a flexible circuit board 8.

In this embodiment, the photodetector 6 is preferably a photodetector chip with a transmission rate of 25G. The amplifier 7 is preferably a transimpedance amplifier chip (TIA) using PAM4 pulse amplitude modulation technique, which can receive two bits of data at a time, so that an optical signal at 100G rate can be received to increase the transmission speed.

Referring to fig. 3 and 4, the front half of the optical fiber 2 is protected with the optical fiber protection sleeve 9. One end of the optical fiber protecting jacket 9 is fixed to the optical fiber receptacle 1, and the other end thereof is fixed to the perforated hole 34 of the housing 3 (see fig. 6 and 7), so that an axial drawing force can be applied to the optical fiber 2, preventing the optical fiber 2 connected between the optical fiber receptacle 1 and the housing 3 from being broken by an external force.

Referring to fig. 6, 7 and 8, the circuit board 5 is composed of a base plate 51 and a ceramic base 52, and the front half portion (composed of the whole of the ceramic base 52 and a part of the base plate 51) of the circuit board 5 is projected into the housing chamber 39, and the rear half portion (composed of the remaining part of the base plate 51) is projected rearward from the housing 3. The ceramic pedestal 52 is thinner than the substrate 51. The ceramic susceptor 52 is welded to the front side of the substrate 51.

Referring to fig. 5, the photodetector 6 and the amplifier 7 are disposed on the upper surface of the ceramic base 52. The top surfaces of the photodetector 6 and the amplifier 7 are substantially flush with the top surface of the substrate 51. The flexible circuit board 8 is soldered to the rear upper surface of the substrate 51. The flexible circuit board 8 protrudes outward from the housing 3, and is provided at its distal end with a plurality of pads 82 (see fig. 3 and 4), and the pads 8 are soldered to the docking circuit board 50 correspondingly, so that the electric signal amplified by the amplifier 7 can be outputted outward.

Referring to fig. 2, the light emitting assembly 20 includes a second fiber optic receptacle 202 and a second housing 204 for receiving a light emitting element (not shown) therein, wherein the second fiber optic receptacle 202 and the second housing 204 are rigidly connected together as described in the background.

Compared with the prior art, the optical transceiver module 100 and the optical receiving assembly 10 of the present invention have the following advantages: when the butt circuit board 50 soldered with the light receiving module 10 and the light emitting module 20 is assembled to the base 40 of the light receiving module 100, the second fiber optic receptacle 202 of the rigidly connected light emitting module 20 may be correspondingly fastened to the base 40, and then the fiber optic receptacle 1 of the light receiving module 10 may be correspondingly fastened to the base 40. Because the optical fiber socket 1 and the shell 3 of the light receiving assembly 10 are flexibly connected together by adopting the optical fibers 2, the optical fiber socket 1 can be conveniently and accurately aligned and clamped to the base 40 during installation; on the other hand, the flexible connection is beneficial to accommodate larger assembly tolerances in the manufacturing process, and the situation that the two fiber

optic receptacles

1, 202 cannot be simultaneously and accurately aligned and clamped to the base 40 does not occur. In addition, the light receiving assembly 10 of the present invention has the receiving end 21 of the optical fiber 2 disposed on the optical fiber receptacle 1, and uses the reflecting end face 231 of the emitting end 23 of the optical fiber 2 to directly couple the signal light to the photodetector 6 below the emitting end 23, so that the design does not need to introduce a lens array and an optical waveguide element during the transmission of the signal light as in the background art, and thus the insertion loss and return loss of the signal light can be reduced. In addition, since the amplifier 7 is a transimpedance amplifier chip employing PAM4 pulse amplitude modulation technique, an optical signal of 100G can be received at a rate of 25G, improving the transmission rate.

The foregoing is merely illustrative of the preferred embodiments of the present invention and is not intended to limit the embodiments of the present invention, and those skilled in the art can easily make corresponding variations or modifications according to the main concept and spirit of the present invention, so the protection scope of the present invention shall be defined by the claims.

Claims

1. An optical transceiver module, comprising: the light receiving assembly comprises:

the optical fiber socket is used for receiving a signal light;

the shell is provided with a containing cavity, the connecting section and the emergent end of the optical fiber extend into the containing cavity, and a fixing seat and a circuit board are arranged in the containing cavity; the fixing seat is provided with a fixing groove, and the connecting section of the optical fiber is correspondingly fixed in the fixing groove; the circuit board is provided with a light detector and an amplifier, the light detector is arranged below the emergent end of the optical fiber, and the optical fiber socket and the shell are flexibly connected together by the optical fiber, so that the optical fiber socket can be conveniently and accurately aligned and clamped on the base; the optical receiving assembly also comprises a flexible circuit board connected with the circuit board, the flexible circuit board extends outwards from the shell, and a plurality of welding pads are arranged at the tail end of the flexible circuit board and correspondingly welded to the butt joint circuit board, so that the electric signal amplified by the amplifier can be outwards output; the circuit board is composed of a base plate and a ceramic base; wherein, the ceramic base is welded on the front side of the substrate, and the photodetector and the amplifier are arranged on the upper surface of the ceramic base;

the light emitting assembly comprises a second fiber optic receptacle and a second housing for receiving a light emitting element therein, wherein the second fiber optic receptacle and the second housing are rigidly connected together.

2. The optical transceiver module of claim 1, further comprising an optical fiber protective sleeve disposed around the optical fiber, the optical fiber protective sleeve having one end secured to the optical fiber receptacle and the other end secured to the housing.

3. The optical transceiver module of claim 1, wherein the exit end of the optical fiber is disposed horizontally, and the reflecting inclined plane forms an angle of 45 degrees with the axial direction of the optical fiber.

4. The optical transceiver module of claim 1, wherein the fixing groove is V-shaped, and the connecting section of the optical fiber is adhered in the fixing groove by using adhesive.

5. The optical transceiver module of claim 1, wherein the optical detector employs an optical detector chip with a transmission rate of 25G, and the amplifier employs a transimpedance amplifier chip with PAM4 pulse amplitude modulation technique.

6. The optical transceiver module of any one of claims 1-5, wherein all of the ceramic base and a portion of the substrate extend into the receiving cavity, and the remainder of the substrate extends rearward from the housing.

7. The optical transceiver module of claim 6, wherein the ceramic base is thinner than the substrate, and the top surfaces of the photodetector and the amplifier are flush with the top surface of the substrate; the flexible circuit board is soldered to the rear upper surface of the substrate.