CN110275252B - Optical Transceiver Module - Google Patents

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 invention relates to a light receiving component, in particular to a light receiving component suitable for an optical transceiver module and beneficial to improving signal transmission quality.

Background technique

Chinese patent CN201410466751.2 discloses a light-receiving subassembly, which includes: a housing; a substrate, located in the housing; a fiber optic socket, located on one side of the housing, the fiber optic socket includes a first end and a second end, the first end is used to receive an optical fiber, the optical fiber is used to transmit a first light beam, and guide the first light beam to the second end; a lens is arranged in the housing, And adjacent to the second end; a plurality of optical sensing elements are arranged on the substrate; an optical waveguide element is arranged on the substrate and is located between the lens and the optical sensing elements, and the optical waveguide element includes An input end and a plurality of output ends, the lens is used to focus the first light beam output from the second end on the input end, and the optical waveguide element is used to focus the first light beam received by the input end according to the wavelength of the first light beam received by the input end. The first light beam received by the input end is dispersed into a plurality of second light beams, and the output of the second light beams from the second ends is dispersed and output from the output ends, and the output ends are located at the light sensing elements above; and at least one lens array, located above the light sensing elements, adjacent to the optical waveguide element, the lens array includes at least one incident end, a reflective surface and at least one outgoing end, each of the incident ends is aligned One of the output ends of the optical waveguide element, each of the output ends is aligned with one of the light sensing elements, and the reflective surface is used to turn the second light beams entering the input end toward the output end; the lens array further includes an incident lens, disposed at one of the incident ends, the incident lens is used to receive the second light beam output from one of the output ends, and focus the second light beam onto the reflective surface The lens array further includes an exit lens, which is disposed at one of the exit ends, and the exit lens is used to focus the second light beam reflected by the reflective surface to one of the photo-sensing elements. This light-receiving subassembly structure requires the introduction of lenses, optical waveguide components, and lens arrays. The signal beam input from the fiber optic socket needs to be coupled multiple times before reaching the optical sensing element, which increases the insertion loss and return loss of the signal beam. It is not conducive to improving the quality of signal transmission.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the shortcomings of the above-mentioned prior art, and propose a light receiving component, which is beneficial to simplify the manufacturing process, reduce the insertion loss and return loss of signal light, and improve the transmission rate.

The present invention proposes a kind of light-receiving component for above-mentioned technical problem, comprises:

an optical fiber socket for receiving a signal light;

An optical fiber, which has a receiving end, an emitting end and a connection section between the receiving end and the emitting end, the receiving end is fixed to the optical fiber socket, and the emitting end has a reflective slope;

A housing, which has a receiving cavity, the connecting section and the outgoing end of the optical fiber extend into the receiving cavity, and a fixing seat and a circuit board are arranged in the receiving cavity; the fixing seat has a fixing groove, and the connecting section of the optical fiber Correspondingly fixed in the fixing groove; the circuit board is provided with a photodetector and an amplifier, and the photodetector is arranged below the output end of the optical fiber;

Wherein, the signal light input from the receiving end of the optical fiber enters the optical detector after being reflected by the reflective slope of the optical fiber and is converted into an electrical signal, and the electrical signal is amplified by the amplifier and then outputted.

Aiming at the above technical problems, the present invention also proposes an optical transceiver module, including: a base, a cover, and a pair of joints installed in the space enclosed by the base and the cover and extending outwards. A circuit board, a light emitting component welded to the docking circuit board, and a light receiving component as described above.

Compared with the prior art, the optical receiving assembly of the present invention transmits signal light by cleverly using the optical fiber connected between the optical fiber socket and the housing, and then directly reflects the signal light to the optical detection below by using the reflective slope at the output end of the optical fiber. The device is beneficial to simplify the manufacturing process, reduce the insertion loss and return loss of signal light, and increase the transmission rate.

Description of drawings

FIG. 1 is an assembled perspective view of a preferred embodiment of the optical transceiver module of the present invention.

FIG. 2 is an exploded perspective view of FIG. 1 .

FIG. 3 and FIG. 4 are perspective views of a preferred embodiment of the light-receiving component of the present invention from two different viewing angles, wherein the top cover of the light-receiving component is removed.

FIG. 5 is a partially enlarged view of area A in FIG. 4 .

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

FIG. 9 is a partially enlarged view of area C in FIG. 8 .

Wherein, the reference numerals are described as follows: 100 optical transceiver module 10 light receiving component 20 light emitting component 202 second optical fiber socket 204 second housing 30 cover 40 base 50 docking circuit board 1 optical fiber socket 2 optical fiber 3 housing 32 opening 34 Perforation 39 Storage cavity 4 Fixing seat 42 Fixing groove 5 Circuit board 51 Substrate 52 Ceramic base 6 Photodetector 7 Amplifier 8 Flexible circuit board 82 Welding pad 9 Optical fiber protective cover.

Detailed ways

While the invention may readily manifest in different forms of embodiments, only a few specific embodiments have been shown in the drawings and will be described in detail in this specification, with the understanding that the specification should be considered as the These are exemplary illustrations of the principles of the invention and are not intended to limit the invention to what is described herein.

Thus, a feature indicated in this specification will be used to describe one of the features of an embodiment of the invention, not to imply that every embodiment of the invention must have the described feature. Furthermore, it should be noted that this specification describes a number of features. Although certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly described. Thus, the illustrated combinations are not intended to be limiting unless otherwise stated.

In the embodiments shown in the drawings, directional designations (such as up, down, left, right, front and rear) are used to explain that the structure and movement of the various elements of the invention are not absolute but relative. These descriptions are applicable when the elements are in the positions shown in the drawings. If the indications of the positions of these elements are changed, the indications of these directions are changed accordingly.

The preferred embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings of this specification.

Referring to FIG. 1 and FIG. 2 , the present invention proposes an optical transceiver module 100 that is applicable to 100G optical signal transmission. The optical transceiver module 100 includes: a base 40, a cover 30, a pair of connecting circuit boards 50 installed in the 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 are welded on the docking circuit board 50 . Wherein the light emitting component 20 is used for emitting a signal light, and the light receiving component 10 is used for receiving a signal light.

3 to 9, the present invention proposes a light receiving assembly 10, the light receiving assembly 10 includes: an optical fiber socket 1, an optical fiber 2, a housing 3 connected together with the optical fiber socket 1 through the optical fiber 2 , a fixed seat 4 and a circuit board 5 installed in the housing 3 , and a light detector 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 connection section 25 between the receiving end 21 and the emitting end 23, and the outer periphery of the optical fiber 2 is provided with a fiber protection sleeve 9 for Protect the optical fiber 2 from damage. Wherein, the receiving end 21 is fixed together with the optical fiber socket 1 and used for receiving a signal light.

Referring to FIG. 4 and FIG. 5 , the housing 3 is in the shape of a rectangle, and a receiving cavity 39 is formed in the middle thereof, wherein the top cover for closing the receiving cavity 39 is removed to show its internal structure. Referring to FIG. 6 and FIG. 7 , an opening 32 is formed at the rear end of the housing 3 , and a through hole 34 is formed at the front end of the housing 3 . The circuit board 5 is inserted into the receiving cavity 39 from the rear of the opening 32 to the front. The outgoing end 23 and the connecting section 25 of the optical fiber 2 protrude into the receiving cavity 39 of the housing 3 . The connecting section 25 is supported by a fixing groove 42 provided on the fixing seat 4 in the receiving cavity 39 . The fixing groove 42 is defined horizontally on the top surface of the fixing base 4 and is in a V-shaped structure extending along the front-back direction. The connecting section 25 is preferably bonded in the fixing groove 42 with glue (for example: epoxy glue). This fixing structure is beneficial to make the outgoing end 23 of the optical fiber 2 extend horizontally.

Referring to FIG. 5 and FIG. 9 , the emitting end 23 is provided with a reflective slope 231 . The angle between the reflective slope 231 and the axis of the optical fiber 2 is preferably 45 degrees. After the signal light input from the receiving end 21 is reflected by the reflecting slope 231, it enters the photodetector 6 located below the emitting end 23 and is converted into an electrical signal. After the electrical signal is amplified by the amplifier 7, it can pass through a flexible circuit The board 8 is exported to the docking circuit board 50 .

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 technology, which can receive two bits of data at a time, so that it can receive optical signals at a rate of 100G to increase the transmission speed.

Referring to FIG. 3 and FIG. 4 , the first half of the optical fiber 2 is protected by the optical fiber protective sleeve 9 . One end of the optical fiber protective sleeve 9 is fixed to the optical fiber receptacle 1, and the other end is fixed to the through hole 34 of the housing 3 (see FIGS. 6 and 7), so that the optical fiber 2 can bear the axial pulling force, Prevent the optical fiber 2 connected between the optical fiber socket 1 and the housing 3 from being broken by external force.

Referring to Fig. 6, Fig. 7 and Fig. 8, this circuit board 5 is made of a substrate 51 and a ceramic base 52, and the front half of this circuit board 5 (consists of the whole of the ceramic base 52 and a part of the substrate 51) protrudes into the receiving cavity 39 , and the rear half (composed of the remaining part of the base plate 51 ) protrudes backward from the housing 3 . The ceramic base 52 is thinner than the substrate 51 . The ceramic base 52 is welded on 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 . 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 welded on the rear upper surface of the substrate 51 . The flexible circuit board 8 protrudes from the housing 3, and its end is provided with a plurality of soldering pads 82 (see FIGS. 3 and 4 ). The amplified electrical signal is output to the outside.

Referring to FIG. 2, the light emitting assembly 20 includes a second fiber optic socket 202 and a second housing 204 for installing a light emitting element (not shown) therein, wherein the second fiber optic socket 202 and the The second housing 204 is rigidly connected together as in the background art.

Compared with the prior art, the beneficial effects of the optical transceiver module 100 and its light receiving component 10 of the present invention include: when the docking circuit board 50 soldered with the light receiving component 10 and the light emitting component 20 is assembled to the When the base 40 of the optical transceiver module 100 is installed, the second optical fiber socket 202 of the light transmitting assembly 20 that is rigidly connected can be correspondingly fastened to the base 40, and then the optical fiber socket 1 of the light receiving assembly 10 can be correspondingly fastened to the base 40. Seat 40. Since the optical fiber socket 1 and the housing 3 of the light receiving component 10 are flexibly connected together by the optical fiber 2, the optical fiber socket 1 can be easily aligned and fastened to the base 40 during installation; The above-mentioned flexible connection is beneficial to adapt to larger assembly tolerances in the manufacturing process, and there will be no situation where the two optical fiber sockets 1 and 202 cannot be accurately aligned and fastened to the base 40 at the same time. In addition, in the light receiving assembly 10 of the present invention, the receiving end 21 of the optical fiber 2 is arranged on the optical fiber socket 1, and the reflective end face 231 of the emitting end 23 of the optical fiber 2 is used to directly couple the signal light to the photodetector below the emitting end 23. 6. This design does not need to introduce lens arrays and optical waveguide elements in the transmission process of signal light as in the background technology, so that the insertion loss and return loss of signal light can be reduced. In addition, since the amplifier 7 is a transimpedance amplifier chip using PAM4 pulse amplitude modulation technology, it can receive 100G optical signals at a rate of 25G and increase the transmission rate.

The above content is only a preferred embodiment of the present invention, and is not intended to limit the implementation of the present invention. Those of ordinary skill in the art can easily make corresponding modifications or modifications according to the main concept and spirit of the present invention. Therefore, the present invention The scope of protection should be subject to the scope of protection required by the claims.

Claims (7)

1. An optical transceiver module, characterized in that it comprises: a base, a cover, a pair of connecting circuit boards installed in the space enclosed by the base and the cover and extending outward And a light receiving assembly and a light emitting assembly welded on the docking circuit board, wherein the light receiving assembly includes: an optical fiber socket for receiving a signal light; An optical fiber, which has a receiving end, an emitting end and a connection section between the receiving end and the emitting end, the receiving end is fixed to the optical fiber socket, and the emitting end has a reflective slope; A housing, which has a receiving cavity, the connecting section and the outgoing end of the optical fiber extend into the receiving cavity, and a fixing seat and a circuit board are arranged in the receiving cavity; the fixing seat has a fixing groove, and the connecting section of the optical fiber Correspondingly fixed in the fixing groove; the circuit board is provided with a photodetector and an amplifier, the photodetector is arranged below the exit end of the optical fiber, and the optical fiber socket and the housing are flexibly connected together by means of the optical fiber, so that The optical fiber socket can be conveniently and accurately aligned and fastened to the base; wherein, the signal light input from the receiving end of the optical fiber is reflected by the reflective slope of the optical fiber, and then enters the optical detector and is converted into an electrical signal. signal, the light-receiving component also includes a flexible circuit board connected to the circuit board, the flexible circuit board protrudes from the housing, and its end is provided with a plurality of welding pads, and these welding pads are correspondingly welded to the docking circuit board, so that The electrical signal amplified by the amplifier can be output to the outside; the circuit board is composed of a substrate 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; Wherein, the light emitting assembly includes a second optical fiber socket and a second housing for arranging a light emitting component therein, wherein the second optical fiber socket and the second housing are rigidly connected together. 2. The optical transceiver module according to claim 1, further comprising an optical fiber protection sleeve sleeved on the outer periphery of the optical fiber, one end of the optical fiber protection sleeve is fixed to the optical fiber socket, and the other end is fixed to the housing . 3 . The optical transceiver module according to claim 1 , wherein the outgoing end of the optical fiber is arranged horizontally, and the inclined reflection plane forms an included angle of 45 degrees with the axial direction of the optical fiber. 4 . 4. The optical transceiver module according to claim 1, wherein the fixing groove is V-shaped, and the connecting section of the optical fiber is bonded in the fixing groove by glue. 5. The optical transceiver module according to claim 1, wherein the optical detector adopts an optical detector chip with a transmission rate of 25G, and the amplifier adopts a transimpedance amplifier chip of PAM4 pulse amplitude modulation technology. 6. The optical transceiver module according to any one of claims 1 to 5, wherein all of the ceramic base and a part of the substrate protrude into the receiving cavity, and the remaining part of the substrate protrudes from the The housing protrudes backward. 7. The optical transceiver module according to 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 Welded on the upper surface of the rear end of the substrate.

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