CN111239927A

CN111239927A - SFP optical module

Info

Publication number: CN111239927A
Application number: CN202010155008.0A
Authority: CN
Inventors: 路绪刚
Original assignee: HEBEI HYMAX OPTOELECTRONIC Inc
Current assignee: HEBEI HYMAX OPTOELECTRONIC Inc
Priority date: 2020-03-06
Filing date: 2020-03-06
Publication date: 2020-06-05

Abstract

The application discloses SFP optical module includes: the optical module comprises a bottom shell, an upper shell, a sliding lock, a pull ring, a return spring, a photoelectric part, a pressing block and a metal plate elastic sheet, wherein an optical module cavity formed by assembling the bottom shell and the upper shell is used for accommodating and fixing the photoelectric part, the sliding lock can be slidably arranged in the bottom shell and can advance under the pushing of the pull ring to jack up the elastic sheet lock locked in a metal cage on the upper shell, so that the optical module is unlocked, and the pull ring is pulled outwards to enable the optical module to exit from the metal cage. Based on the SFP optical module provided by the application, under the condition of smaller occupied space, the photoelectric part can be stably installed and contained in the cavity of the optical module; the photoelectric part is firmly butted with the LC optical fiber connector and the electric connector in the host device; the optical module is well locked and unlocked in the metal cage; the bottom shell, the upper shell, the sliding lock, the pull ring, the reset spring, the photoelectric part, the pressing block and the metal plate elastic sheet are convenient and quick to mount and dismount; the bottom shell, the sliding lock, the pull ring and the return spring can be repeatedly utilized, and cost is saved.

Description

SFP optical module

Technical Field

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

Background

The steady development of the global telecommunication industry and the steady growth of broadband users lay a solid foundation for the development of the optical communication industry. With the continuous improvement of the global bandwidth demand and the expansion of the application fields of data centers and security monitoring optical communication industries, the optical fiber broadband access has become the mainstream communication mode. Under the promotion of popularization of terminals such as smart phones and the like and applications such as video and cloud computing and the like, telecom operators continuously invest in building and upgrading mobile broadband and optical fiber broadband networks, and the investment scale of optical communication equipment is further expanded.

The rapid development of the optical communication industry drives the updating of the optical module. Under the market competition environment where optical communication is increasingly intense at present, the demand of communication equipment for reducing the size of the equipment and increasing the interface density is also increasing. In order to meet the requirement, the optical module is also developed towards a small package with high integration level, various high-cost optical modules are more and more, the structure is complex, the requirement on the photoelectric part is higher, and heavier economic cost is brought to enterprises and users, so that the optical module with a simple structure and lower cost is needed to meet the requirements of part of enterprises and users. Therefore, an optical module is needed, in which an optical portion can be stably accommodated in an optical module cavity, and an LC optical fiber Connector (Lucent Connector or LocalConnector, or Lucent Connector) can be smoothly latched or unlatched to the optical module for transmitting and receiving optical signals; the golden fingers of the functional circuit board in the optical module can be stably inserted and connected with an electric connector in the host device to send and receive electric signals; the optical module shell and the photoelectric part are simply and quickly assembled; and the cost of the optical module is low.

Disclosure of Invention

The embodiments of the present invention are directed to provide an Optical module with a simple structure and low cost, in which an optoelectronic device, a functional circuit board, and the like of the Optical module are stably installed in a structural cavity of the Optical module, an LC Optical fiber connector is plugged into an Optical fiber port of the Optical module to be in butt joint with a TOSA (transmitter Optical Sub-Assembly) and a ROSA (receiver Optical Sub-Assembly) for signal transmission, and a gold finger of the functional circuit board in the Optical module is firmly plugged into an electrical connector in a host device for Transmitting and receiving an electrical signal.

To achieve the above object, an embodiment of the present invention provides an SFP (10Gb Small Form-factor pluggable) optical module, including: the optical module comprises a bottom shell, an upper shell, a sliding lock, a pull ring, a return spring, a photoelectric part, a pressing block and a metal plate elastic sheet, wherein an optical module cavity formed by assembling the bottom shell and the upper shell is used for accommodating and fixing the photoelectric part, the sliding lock can be slidably arranged in the bottom shell and can advance under the pushing of the pull ring to jack up the elastic sheet lock locked in a metal cage on the upper shell, so that the optical module is unlocked, and the pull ring is pulled outwards to enable the optical module to exit from the metal cage.

The bottom shell is symmetrically provided with an upper shell buckling bulge and a metal plate elastic sheet buckling bulge at two sides of the shell, one end of the shell is provided with a sliding groove and a stopping surface, the bottom shell is also symmetrically provided with a spring groove, a rotating hole and an optical fiber port, the other end of the shell is provided with a limiting surface, the sliding groove is a sliding groove through hole arranged at the front end of the bottom shell and provides a smooth sliding route for the sliding lock, the stopping surface is a plane arranged at the front end of the bottom shell and is in a plane together with the sliding groove, the spring groove is a cylindrical blind hole arranged at two sides of the sliding groove and used for accommodating the reset spring, the inner diameter of the spring groove is larger than the outer diameter of the reset spring, the reset spring can freely move in the spring groove, the rotating hole is used for clamping the pull ring, the optical fiber port is provided with a clamping surface, the clamping surface is matched with an LC optical fiber connector, and the LC optical fiber connector is clamped in the optical fiber port and, the limiting surface is abutted against a limiting elastic sheet in the metal cage, so that a golden finger in a functional circuit board of the optical module is in good contact with an electric connector in a host device;

the upper shell is symmetrically provided with an upper shell buckling hole, an arc bulge and a clamping and pressing bulge at two sides of the shell, the upper surface of the shell is provided with a lock head, the upper shell buckling hole is buckled on the upper shell buckling bulge so that the upper shell and the bottom shell are assembled and fixed together to form an optical module cavity, the arc bulge is matched with the metal cage so that the optical module is stably inserted into the metal cage, the clamping and pressing bulge is used for clamping and pressing the functional circuit board, the lock head is a triangular bulge arranged on the upper surface of the upper shell and provided with a locking surface for locking a spring sheet lock in the metal cage, and the spring sheet lock is locked on the locking surface so that the optical module is locked in the metal cage;

the sliding lock is provided with a stress part, an unlocking part, an installation column body and a positioning column, and the pull ring applies force to the stress part to push the sliding lock to slide forwards in the sliding chute against the elasticity of the return spring; the unlocking part is a wedge-shaped body arranged on two sides of the front end of the sliding lock, and when the sliding lock slides forwards, the wedge-shaped body pushes the spring plate lock to be separated from the lock head, so that the optical module is unlocked; the slide lock encapsulates the return spring in the spring groove through the mounting column body and the positioning column which are arranged on the two sides of the slide lock;

the pull ring is provided with a rotating shaft, a force application bulge, a handheld part, a cantilever and a sleeve, and the rotating shaft is clamped in a rotating hole of the bottom shell; the force application bulge is a U-shaped bulge arranged in the middle of the pull ring, the force application bulge is in close contact with the stress part and applies force to the stress part, the slide lock slides forwards by means of rotation of the pull ring to complete unlocking, the slide lock slides backwards by means of the reset spring to complete resetting of the slide lock and the pull ring, when the pull ring rotates to the unlocking position and then continues to rotate, the force application bulge abuts against the stop surface, the rotation force of the pull ring is transmitted to the stop surface by the force application bulge, so that the rotation of the pull ring is stopped, the pull ring is prevented from being damaged due to excessive rotation, the handheld part provides pulling force to rotate the pull ring under the action of external force, the cantilever, the rotation shaft, the force application bulge and the handheld part form a closed frame body, and provides torque for rotation of the rotation shaft, the sleeve is a circular cylinder made of plastic materials, is fixedly sleeved on the handheld part and is made of different colors and used for marking different working wavelengths of the optical module;

the photoelectric part comprises a TOSA (transmitter optical subassembly), a ROSA (receiver optical subassembly) and a functional circuit board, wherein the TOSA and the ROSA are respectively provided with a pin, one end of the functional circuit board is provided with a welding spot, the other end of the functional circuit board is provided with a golden finger, positioning grooves are formed in two sides of the functional circuit board, the pins are welded on the welding spots, so that the TOSA, the ROSA and the functional circuit board are welded into an integral component to form the photoelectric part, the TOSA converts an electric signal in the functional circuit board into an optical signal and transmits the optical signal to an LC optical fiber connector to communicate with remote equipment, the ROSA converts the optical signal received by the LC optical fiber connector from the remote equipment into the electric signal and transmits the electric signal to the functional circuit board, and the golden finger;

the pressing block is provided with an arc groove and a boss, the arc groove is used for clamping and pressing the TOSA and the ROSA, and the boss is abutted against the inner surface of the upper shell, so that the pressing block is stably fixed in the cavity of the optical module;

the metal plate elastic piece is symmetrically provided with metal plate elastic piece buckling holes at two sides, the elastic pieces are symmetrically arranged at the bottom surface, the metal plate elastic piece buckling holes are buckled on the metal plate elastic piece buckling protrusions, so that the metal plate elastic pieces are fixedly installed on the bottom shell, the elastic pieces provide elastic force, the optical module is firmly locked in the metal cage, and the optical module plays a role of auxiliary elastic force when being unlocked.

In the above SFP optical module, the bottom case is further provided with a positioning protrusion, a lower positioning surface, a fixture block, a mark, a pointer disc, a direction groove and a label groove, the positioning protrusion is matched with the positioning groove to realize front and back fixing of the functional circuit board in the optical module cavity, the lower positioning surface is matched with the clamping protrusion in the upper case to realize upper and lower fixing of the functional circuit board in the optical module cavity, the fixture block is used for positioning the TOSA and the ROSA and is matched with the arc groove to stop pressing of the TOSA and the ROSA to be fixed in the optical module cavity, the mark is used for marking company LOGO and mold opening date, the pointer disc is used for explaining the production and processing date of the optical module, the direction groove is an arrow-shaped groove arranged on the outer surface of the bottom case and is used for explaining the receiving and transmitting of optical signals, and the label groove is a rectangular groove arranged on the outer surface of the, for applying labels.

The optical module further comprises a dustproof plug, the dustproof plug is inserted into the optical fiber port, the TOSA and the ROSA are protected when the optical module is in a non-working state, anti-skid protrusions and LOGO protrusions are arranged, the anti-skid protrusions are used for being pulled out of the optical module, friction force between the anti-skid protrusions and fingers is increased when the dustproof plug is pulled out smoothly, and the LOGO protrusions are used for marking LOGO of a production company of the optical module.

Based on the SFP optical module provided by the application, under the condition of smaller occupied space, a photoelectric part of the optical module can be stably installed and contained in an optical module cavity; the photoelectric part is firmly butted with the LC optical fiber connector and the electric connector in the host device; the optical module is well locked and unlocked in the metal cage; the bottom shell, the upper shell, the sliding lock, the pull ring, the reset spring and the metal plate elastic sheet are convenient and quick to mount and dismount; the bottom shell, the sliding lock, the pull ring and the return spring can be repeatedly utilized, and cost is saved.

Drawings

Fig. 1 is an exploded view of an SFP optical module according to an embodiment of the present disclosure;

fig. 2 is an exploded view of a SFP optical module according to an embodiment of the present disclosure;

FIG. 3 is a first diagram illustrating an assembling effect of an SFP optical module according to an embodiment of the present disclosure;

FIG. 4 is a second diagram illustrating an assembling effect of an SFP optical module according to an embodiment of the present disclosure;

fig. 5 is a schematic diagram illustrating an unlocking state of an SFP optical module according to an embodiment of the present application;

fig. 6 is a first schematic view of a bottom case of an SFP optical module according to the present application;

fig. 7 is a schematic diagram of a bottom case of an SFP optical module according to the present application;

fig. 8 is a first schematic view of an upper case of an SFP optical module according to the present application;

fig. 9 is a schematic diagram of an upper case of an SFP optical module according to the present application;

FIG. 10 is a schematic view of a slide lock of an SFP optical module according to the present application;

FIG. 11 is a schematic diagram of a pull ring of an SFP optical module according to the present application;

fig. 12 is a schematic diagram of a sheet metal spring of an SFP optical module according to the present application;

FIG. 13 is a schematic diagram of a compact of an SFP optical module according to the present application;

fig. 14 is a schematic diagram of an optoelectronic part of an SFP optical module according to the present application;

fig. 15 is a schematic diagram of a functional circuit board of an SFP optical module according to the present application;

fig. 16 is a schematic diagram of an LC fiber connector externally used in cooperation with an SFP optical module according to the present application;

fig. 17 is a schematic view of a dust plug of an SFP optical module according to the present application;

fig. 18 is a schematic view of a metal cage used in conjunction with an SFP optical module installed in a host device according to the present application.

The reference numerals are explained below:

100 bottom shell

111 upper case snap 112 sheet metal spring snap 121 slide 122 stop surface 123 spring groove 124 rotation hole 130 optical fiber port 131 snap 140 stop surface 141 positioning projection 142 lower positioning surface 150 latch 161 identification 162 pointer plate 170 direction groove 180 label groove

200 upper case

210 upper shell buckle hole 220 arc bulge 230 clamping and pressing bulge 240 lock

300 sliding lock

310 forced part 320 unlocking part 331 installation column 332 positioning column

400 pull ring

410 rotating shaft 420 force applying projection 430 hand-held part 440 cantilever 450 sleeve

500 return spring

600 metal plate spring

610 sheet metal spring plate buckling hole 620 spring plate

700 briquetting

710 arc groove 720 boss

800 photoelectric part

810ROSA 811 pin 820TOSA 830 function circuit board 831 welding point 832 locating slot 833 golden finger

900LC optical fiber connector

910 locking surface 920 unlocking block 930 spring block

1010 dustproof plug

1011 skidproof raised 1012LOGO raised

1020 Metal cage

1021 spring plate lock 1022 spring limiting plate

Detailed Description

Specific embodiments of the present application will be described in detail below. It should be noted that the embodiments described herein are only for illustration and are not intended to limit the present application.

Fig. 1 is an exploded view of an SFP optical module according to an embodiment of the present disclosure, where the SFP optical module according to the embodiment includes: bottom shell 100, top shell 200, slide lock 300, pull ring 400, reset spring 500, photoelectric part 800, briquetting 700 and panel beating shell fragment 600.

As shown in fig. 2 to 5, the optoelectronic module 800 is mounted in a cavity formed by a housing structure of the optical module to form a complete optical module.

As shown in fig. 6 and 7, the bottom housing 100 is symmetrically provided with an upper housing snap protrusion 111 and a metal plate spring plate snap protrusion 112 at two sides of the housing, one end of the housing is provided with a sliding slot 121 and a stop surface 122, the housing is further symmetrically provided with a spring slot 123, a rotation hole 124 and an optical fiber port 130, the other end of the housing is provided with a limiting surface 140, the sliding slot 121 is a sliding slot through hole provided at the front end of the bottom housing 100 to provide a smooth sliding route for the sliding lock 300, the stop surface 122 is a plane provided at the front end of the bottom housing 100 and is located on a plane with the sliding slot 121, the spring slot 123 is a cylindrical blind hole provided at two sides of the sliding slot 121 to accommodate the return spring 500, the inner diameter of the spring slot 123 is larger than the outer diameter of the return spring 500, the return spring 500 can freely move in the spring slot 123, the rotation hole 124 is used for clamping the pull ring 400, the optical fiber port 130 is provided with a snap surface 131, the snap surface 131 is matched with the LC optical fiber connector 900, the LC, the optical module receives and transmits optical signals from and to the external device, and the limiting surface 140 abuts against the limiting spring 1022 in the metal cage 1020, so that the gold finger 833 in the functional circuit board 830 of the optical module makes good contact with the electrical connector in the host device.

As shown in fig. 8 and 9, the upper case 200 is symmetrically provided with an upper case fastening hole 210, an arc protrusion 220 and a pressing protrusion 230 on two sides of the case, the upper surface of the case is provided with a lock head 240, the upper case fastening hole 210 is fastened on the upper case fastening protrusion 111, so that the upper case 200 and the bottom case 100 are assembled and fixed together to form an optical module cavity, the arc protrusion 220 is matched with a metal cage 1020, so that the optical module is stably inserted into the metal cage 1020, the pressing protrusion 230 is used for pressing a functional circuit board 830, the lock head 240 is a triangular protrusion arranged on the upper surface of the upper case 200, and has a locking surface for locking a spring plate lock 1021 in the metal cage 1020, and the spring plate lock 1021 is locked on the locking surface, so that the optical module is locked in the metal cage 1020.

As shown in fig. 10, the slide lock 300 is provided with a force-receiving portion 310, an unlocking portion 320, an installation cylinder 331 and a positioning post 332, and the pull ring 400 applies a force to the force-receiving portion 310 to push the slide lock 300 to slide forward in the sliding slot 121 against the elastic force of the return spring 500; the unlocking part 320 is a wedge-shaped body arranged on two sides of the front end of the slide lock 300, and when the slide lock 300 slides forwards, the wedge-shaped body pushes the spring sheet lock 1001 to be separated from the lock head 240, so that the optical module is unlocked; the slide lock 300 encloses the return spring 500 in the spring groove 123 by the mounting post 331 and the positioning post 332 disposed on both sides thereof.

As shown in fig. 11, the pull ring 400 is provided with a rotation shaft 410, a force applying protrusion 420, a hand-held portion 430, a cantilever 440 and a sleeve 450, wherein the rotation shaft 410 is clamped in the rotation hole 124 of the bottom case 100; the force applying protrusion 420 is a U-shaped protrusion disposed at the middle position of the pull ring 400, the force applying protrusion 420 is in close contact with the force receiving portion 310 and applies force to the force receiving portion 310, the slide lock 300 slides forward to complete unlocking by means of rotation of the pull ring 400, and the slide lock 300 slides backward to complete resetting of the slide lock 300 and the pull ring 400 by means of the return spring 500, when the pull ring 400 rotates to the unlocking position and then continues to rotate, the force applying protrusion 420 abuts against the stop surface 122, the rotation force of the pull ring 400 is transmitted to the stop surface 122 by the force applying protrusion 420, thereby stopping rotation of the pull ring 400, preventing the pull ring 400 from being damaged by over-rotation, the hand-held portion 430 provides pulling force to rotate the pull ring 400 under the action of external force, the cantilever 440 forms a closed frame with the rotation shaft 410, the force applying protrusion 420 and the hand-held portion 430, and provides torque for rotation of the rotation shaft 410, the sleeve 450 is, the optical module is fixed on the handheld portion 430 and made of different colors to identify different operating wavelengths of the optical module.

As shown in fig. 14 and 15, the optoelectronic component 800 includes a TOSA820, a ROSA810 and a functional circuit board 830, the TOSA820 and the ROSA810 are both provided with pins 811, the functional circuit board 830 is provided with a solder 831 at one end and a gold finger 833 at the other end, positioning grooves 832 are provided at two sides, the pins 811 are soldered on the solder 831, so that the TOSA820, the ROSA810 and the functional circuit board 830 are soldered into an integral component to form the optoelectronic component 800, the TOSA820 converts an electrical signal in the functional circuit board 830 into an optical signal and transmits the optical signal to an LC optical fiber connector 900 for communication with a remote device, the ROSA810 converts an optical signal received by the LC optical fiber connector 900 from the remote device into an electrical signal and transmits the electrical signal to the functional circuit board 830, and the gold finger 833 is plugged into an electrical connector in a host device for transmitting.

As shown in fig. 13, the pressing block 700 is provided with an arc groove 710 and a boss 720, the arc groove 710 clamps and presses the TOSA820 and the ROSA810 to be fixed in the optical module cavity, and the boss 720 abuts against the inner surface of the upper shell 200, so that the pressing block 700 is fixed in the optical module cavity.

As shown in fig. 12, the sheet metal spring 600 is symmetrically provided with sheet metal spring fastening holes 610 at two sides, and the spring 620 is symmetrically provided at the bottom, the sheet metal spring fastening holes 610 are fastened on the sheet metal spring fastening protrusions 112, so that the sheet metal spring 600 is fixed on the bottom shell 100, and the spring 620 provides elastic force, so that the optical module is stably locked in the metal cage 1000, and plays a role of assisting the elastic force when the optical module is unlocked.

As shown in fig. 6 and 7, the bottom case 100 further has a positioning protrusion 141, a lower positioning surface 142, a fixture block 150, a mark 161, a pointer plate 162, a direction groove 170, and a label groove 180, the positioning protrusion 141 cooperates with a positioning groove 831 in the functional circuit board 830 to fix the functional circuit board 830 in the optical module cavity, the lower positioning surface 142 cooperates with a pressing protrusion 230 in the upper case 200 to fix the functional circuit board 830 in the optical module cavity, the fixture block 150 is used to position the TOSA820 and the ROSA810, and cooperates with an arc groove 710 in the pressing block 700 to fix the TOSA820 and the ROSA810 in the optical module cavity, the mark 161 is used to mark company loaf and mold opening date, the pointer plate 162 is used to explain the production and processing date of the optical module, the direction groove 170 is a rectangular groove in the shape of an arrow go arranged on the outer surface of the bottom case 100 to explain the reception and transmission of optical signals, the label groove 180 is a rectangular groove arranged on the outer, for applying labels.

As shown in fig. 17, the optical module further includes a dust plug 1010, the dust plug 1010 is inserted into the optical fiber port 130, and protects the TOSA820 and the ROSA810 when the optical module is in a non-operating state, and is provided with an anti-slip protrusion 1011 and a LOGO protrusion 1012, the anti-slip protrusion 1011 is used for increasing friction force with fingers when the dust plug 1010 is pulled out from the optical module, so as to pull out the dust plug 1010 smoothly, and the LOGO protrusion 1012 is used for identifying LOGO of a company LOGO of the optical module.

With reference to fig. 4, 16 and 18, a description is given to a using process of the SFP optical module in this embodiment, where the optical module is inserted into a metal cage 1020 in the host device, when the elastic piece lock 1021 is locked on the lock head 240, the limiting surface 140 abuts against the limiting elastic piece 1022, the optical module is locked in the host device, the gold finger 833 contacts with an electrical connector in the host device, then the LC optical fiber connector 900 is inserted into the optical fiber port 130 to abut against the TOSA320 and the ROSA310, the locking surface 910 abuts against the locking surface 131, and the LC optical fiber connector 900 is locked in the optical fiber port 130, at this time, the optical module enters an operating state; when the optical module stops operating, the LC optical fiber connector 900 is pulled out from the optical fiber port 130, the resilient piece 930 is pressed by a finger, the unlocking piece 920 is lowered to the locking surface 910 to disengage from the locking surface 131, the LC optical fiber connector 900 is pulled out, and then a pulling force is applied to the hand-held portion 430 of the pull ring 400 to rotate the pull ring 400, so that the pull ring 400 rotates around the rotation shaft 410. In the transfer process of the pull ring 400, the force application protrusion 420 pushes the slide lock 300 to slide forwards, the wedge-shaped body of the unlocking part 320 jacks up the spring plate lock 1021 locked on the lock head 240, so that the optical module is unlocked in the metal cage 1020, at the moment, the pull ring 400 rotates to the limit position, the force application protrusion 420 abuts against the stop surface 122, the rotation force of the pull ring 400 is transmitted to the stop surface 122 through the force application protrusion 420 (as shown in fig. 5), so that the pull ring 400 stops rotating, the damage of the pull ring 400 due to over rotation is prevented, at the moment, the pull ring 400 is pulled outwards, and the optical module exits the metal cage 1020; after the optical module is unlocked and pulled out of the metal cage 1020, the external force acting on the pull ring 400 disappears, and the return spring 500 in a compressed state in the spring groove 121 starts to release the return elastic force due to the external force, so that the slide lock 300 is pushed to slide backwards to return to the original position, and the pull ring 400 is further driven to return to the original position.

The foregoing is considered as illustrative and exemplary only and is not intended to be limiting of the invention, and it is to be understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present application may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the metes and bounds of the claims, or equivalence of such metes and bounds are therefore intended to be embraced by the appended claims.

Claims

1. An SFP optical module comprising: the optical module comprises a bottom shell, an upper shell, a sliding lock, a pull ring, a return spring, a photoelectric part, a pressing block and a metal plate elastic sheet, wherein an optical module cavity formed by assembling the bottom shell and the upper shell is used for accommodating and fixing the photoelectric part, the sliding lock can be slidably arranged in the bottom shell and can advance under the pushing of the pull ring to jack up the elastic sheet lock locked in a metal cage on the upper shell, so that the optical module is unlocked, and the pull ring is pulled outwards to enable the optical module to exit from the metal cage. It is characterized in that the preparation method is characterized in that,

2. The SFP optical module as claimed in claim 1, wherein the bottom housing further has a positioning protrusion, a lower positioning surface, a locking block, a mark, a pointer plate, a direction slot and a label slot, the positioning protrusion cooperates with the positioning slot to fix the functional circuit board back and forth in the optical module cavity, the lower positioning surface cooperates with the locking protrusion in the top housing to fix the functional circuit board up and down in the optical module cavity, the locking block is used to position the TOSA and ROSA and cooperates with the arc slot to stop pressing the TOSA and ROSA to fix in the optical module cavity, the mark is used to mark LOGO and mold opening date, the pointer plate is used to indicate the date of manufacturing and processing of the optical module, the direction slot is a slot with an arrow shape disposed on the outer surface of the bottom housing to indicate the receiving and transmitting of optical signals, the label groove is a rectangular groove arranged on the outer surface of the bottom shell and used for sticking labels.

3. The SFP optical module according to claim 2, further comprising a dust plug inserted into the optical fiber port to protect the TOSA and the ROSA in the non-operating state of the optical module, wherein the dust plug is provided with an anti-slip protrusion and a LOGO protrusion, the anti-slip protrusion is used to increase friction force with fingers when the dust plug is pulled out from the optical module, so as to pull out the dust plug smoothly, and the LOGO protrusion is used to identify a LOGO of a manufacturing company of the optical module.