CN117631158A

CN117631158A - Optical module

Info

Publication number: CN117631158A
Application number: CN202210952086.2A
Authority: CN
Inventors: 曾威; 蔚永军
Original assignee: Hisense Broadband Multimedia Technology Co Ltd
Current assignee: Hisense Broadband Multimedia Technology Co Ltd
Priority date: 2022-08-09
Filing date: 2022-08-09
Publication date: 2024-03-01

Abstract

The optical module comprises a round square tube body, a light emitting device, a first light receiving device and a second light receiving device, wherein the light emitting device is used for emitting OTDR emitted light, the first light receiving device is used for receiving OTDR reflected light reflected back from the outside of the optical module to realize OTDR monitoring, and the second light receiving device is used for receiving OSC data light from the outside of the optical module to realize OSC transmission; a first lens is arranged in the light emitting device; an optical isolator, a light splitting sheet, a light absorbing sheet, a first filter, a second filter, a reflecting sheet, a third filter and a second lens are arranged in the inner cavity of the circular square tube body; in this application, absorb the reflected light of OTDR emission light through the light absorption piece, avoid getting into in the first light receiving device, block in the reflected light of OTDR emission light gets into first light receiving device through the baffle to cause the crosstalk to first light receiving device when avoiding launching OTDR emission light, guarantee OTDR receptivity.

Description

Optical module

Technical Field

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

Background

With the development of optical communication becoming more and more rapid, optical fiber laying becomes more and more, and intelligent monitoring on optical fiber resources becomes more and more urgent, so most optical modules start to have an OTDR (Optical Time Domain Reflectometer, optical time domain reflection) function, and the performance of the optical fiber is monitored by the OTDR technology to determine events such as optical fiber fusion points, connectors or breakage. The OTDR uses its laser source to send optical pulse to the tested optical fiber, the optical pulse will have optical signal reflected back to the OTDR on the optical fiber itself and each characteristic point, the reflected optical signal is coupled to the receiver of the OTDR through the orientation, and converted into electric signal, finally the result curve is displayed on the display screen.

A single-fiber bidirectional and same-wavelength optical transceiver (BOSA) is usually arranged in the optical module to realize the OTDR function; a ROSA (light receiving device) is also typically provided in the optical module to receive data light of another wavelength to implement OSC (Optical supervisory channel ) functions; the optical module with the structure of one BOSA and one ROSA increases the size of the optical module, which is unfavorable for the small-size development of the optical module.

Meanwhile, because the wavelength of the optical signal emitted by the laser light source is the same as that of the optical signal reflected to the OTDR, the optical signal emitted by the laser light source can cause crosstalk on the optical signal reflected to the OTDR, and the crosstalk can influence an attenuation blind area of the OTDR, so that the attenuation blind area of the OTDR is larger, and the receiving performance of an optical receiving end of the OTDR is seriously influenced.

Disclosure of Invention

The embodiment of the application provides an optical module, which realizes an OTDR function and an OSC function in a tube shell at the same time and reduces crosstalk of an optical transmitting end to an optical receiving end.

The optical module provided in the embodiment of the application includes:

a circuit board;

an optical transceiver assembly electrically connected to the circuit board, comprising:

the side wall of the round square tube body is provided with a first tube orifice, a second tube orifice, a third tube orifice, a fourth tube orifice and a fifth tube orifice respectively;

The light emitting device is connected with the first pipe orifice and comprises a boss for emitting OTDR emitted light into the round square pipe body;

the first light receiving device is embedded in the second pipe orifice and is used for receiving OTDR reflected light with the wavelength of the first wavelength reflected by the outside of the optical module, and the OTDR reflected light is used for OTDR detection;

the second light receiving device is embedded in the third pipe orifice and is used for receiving OSC data light with a second wavelength from the outside of the optical module;

the optical assembly is arranged in the inner cavity of the round square tube body and comprises an optical isolator, a light splitting sheet, a light absorbing sheet, a first filter, a second filter, a reflecting sheet, a third filter and a second lens;

the optical splitter is used for transmitting and reflecting the OTDR emission light to obtain an OTDR emission light first beam splitter and an OTDR emission light second beam splitter respectively, and transmitting and reflecting the OTDR reflection light to obtain an OTDR reflection light first beam splitter and an OTDR reflection light second beam splitter respectively;

the light absorption sheet is arranged in the fourth pipe orifice through a light absorption sheet bracket and is used for absorbing the second light splitting of the OTDR emitted light so as to prevent the second light splitting of the OTDR emitted light from entering the first light receiving device;

The light absorption sheet is obliquely arranged relative to the horizontal axis of the round square tube body so as to prevent unabsorbed second light splitting of the OTDR emitted light from returning to the light emitting device and the first light receiving device along an original path;

the light absorption sheet bracket comprises a cover plate and a column body, wherein the column body is an asymmetric column body at two ends, and a mounting surface is arranged on the column body;

the mounting surface is formed by the concave of the relatively longer end of the column body towards the cover plate at a preset inclination angle and is used for arranging the light absorption sheet;

the mounting surface is provided with a preset inclination angle relative to the cover plate, so that the light absorption sheet is obliquely arranged to prevent the second light splitting of the OTDR emitted light from returning to the light splitting sheet, and further prevent the second light splitting of the OTDR emitted light from returning to the light emitting device;

the mounting surface is U-shaped, a third cavity is arranged in the middle of the mounting surface and used for providing diffuse reflection space for the second light splitting of the OTDR emitted light, and first grooves are respectively arranged at two ends of the mounting surface and used for collecting glue overflowed when the light absorption sheet is attached.

And the optical fiber adapter is connected with the fifth pipe orifice and is used for connecting an external optical fiber so as to transmit the converged OTDR emission light out.

The optical module comprises a round square tube body, a light emitting device, a first light receiving device and a second light receiving device, wherein the light emitting device is used for emitting OTDR emitted light, the first light receiving device is used for receiving OTDR reflected light reflected back in an optical fiber link to realize OTDR monitoring, and the second light receiving device is used for receiving OSC data light from the outside of the optical module to realize OSC data transmission; an optical component is arranged in the inner cavity of the round square tube and comprises an optical isolator, a light splitting sheet, a light absorbing sheet, a first filter, a second filter, a reflecting sheet, a third filter and a second lens; after reaching the light splitting sheet, the OTDR emission light is transmitted and reflected by the light splitting sheet to obtain an OTDR emission light first light splitting and an OTDR emission light second light splitting; in the embodiment of the application, the OTDR detection and the OSC transmission are simultaneously realized in the same round square tube body, which is beneficial to the miniaturization development of the optical module. Meanwhile, most of the OTDR emitted light second light split can be absorbed through the light absorbing sheet, and the light absorbing sheet is obliquely arranged to prevent the OTDR emitted light second light split which is not absorbed by the light absorbing sheet from returning to the light emitting device and the first light receiving device along the original path; and further, crosstalk caused to the first optical receiver device when the OTDR emission light is emitted is avoided, so that the OTDR receiving performance is ensured. Further, in this application embodiment, the light absorption piece is located the internal portion of side's pipe of circle through the light absorption piece support, and the light absorption piece for the horizontal axis slope of side's pipe body sets up, so as to avoid unabsorbed OTDR emission light second beam split returns to along the original way light emitting device reaches first light receiving device.

Drawings

In order to more clearly illustrate the technical solutions of the present disclosure, the drawings that need to be used in some embodiments of the present disclosure will be briefly described below, and it is apparent that the drawings in the following description are only drawings of some embodiments of the present disclosure, and other drawings may be obtained according to these drawings to those of ordinary skill in the art. Furthermore, the drawings in the following description may be regarded as schematic diagrams, not limiting the actual size of the products, the actual flow of the methods, the actual timing of the signals, etc. according to the embodiments of the present disclosure.

Fig. 1 is a connection diagram of an optical communication system according to some embodiments;

fig. 2 is a block diagram of an optical network terminal according to some embodiments;

FIG. 3 is a block diagram of an optical module according to some embodiments;

fig. 4 is an exploded view of a light module according to some embodiments;

fig. 5 is a block diagram of an optical transceiver assembly of an optical module according to some embodiments;

fig. 6 is an exploded view of an optical transceiver assembly of an optical module according to some embodiments;

fig. 7 is a cross-sectional view of an optical transceiver assembly of an optical module according to some embodiments;

fig. 8 is an optical diagram of an optical transceiver assembly of an optical module according to some embodiments;

Fig. 9 is a second optical diagram of an optical transceiver component of an optical module according to some embodiments;

fig. 10 is a third optical diagram of an optical transceiver component of an optical module according to some embodiments;

FIG. 11 is a schematic diagram illustrating an assembly of a light emitting device and a light adapter in an optical transceiver assembly of an optical module according to some embodiments;

fig. 12 is a second schematic diagram of an assembly of a light emitting device and a light adapter in an optical transceiver assembly of an optical module according to some embodiments;

fig. 13 is a third schematic diagram of an assembly of a light emitting device and a light adapter in an optical transceiver assembly of an optical module according to some embodiments;

FIG. 14 is an assembled schematic view of a light emitting device of a light module and a first adjustment sleeve according to some embodiments;

FIG. 15 is an assembled schematic view of a fiber optic adapter and a second adjustment sleeve of an optical module according to some embodiments;

fig. 16 is an assembled schematic view of a first light receiving device in an optical transceiver assembly of an optical module according to some embodiments;

fig. 17 is an assembled schematic view of a second light receiving device in an optical transceiver assembly of an optical module according to some embodiments;

fig. 18 is an exploded schematic view of a light emitting device and a first adjustment sleeve of an optical transceiver assembly of an optical module according to some embodiments;

Fig. 19 is an exploded view of a light emitting device of a light module according to some embodiments;

FIG. 20 is an internal schematic diagram of a light emitting device of a light module according to some embodiments;

fig. 21 is a cross-sectional view of a light emitting device of a light module according to some embodiments;

fig. 22 is a partial cross-sectional view of a light emitting device of a light module according to some embodiments;

FIG. 23 is a specific schematic diagram of a light emitting device of a light module according to some embodiments;

fig. 24 is a cross-sectional view of a light emitting device of a light module according to some embodiments;

FIG. 25 is a backlight detector block diagram of a light emitting device of a light module according to some embodiments;

fig. 26 is a schematic diagram of a header structure of a light emitting device of a light module according to some embodiments;

fig. 27 is a cross-sectional view of a header structure of a light emitting device of a light module according to some embodiments;

fig. 28 is a cross-sectional view of an optical transceiver assembly of an optical module according to some embodiments;

fig. 29 is a cross-sectional view of an internal structure of a circular square tube in an optical transceiver assembly of an optical module according to some embodiments;

fig. 30 is a cross-sectional view of an internal structure of a circular square tube in an optical transceiver assembly of an optical module according to some embodiments;

Fig. 31 is a first block diagram of a circular square tube body in an optical transceiver assembly of an optical module according to some embodiments;

fig. 32 is a second block diagram of a circular square tube body in an optical transceiver assembly of an optical module according to some embodiments;

fig. 33 is a third block diagram of a circular square tube body in an optical transceiver assembly of an optical module according to some embodiments;

fig. 34 is a cross-sectional view of a circular square tube body in an optical transceiver assembly of an optical module according to some embodiments;

fig. 35 is a second cross-sectional view of a circular square tube in an optical transceiver assembly of an optical module according to some embodiments;

fig. 36 is a third cross-sectional view of a round square tube body in an optical transceiver assembly of an optical module according to some embodiments;

FIG. 37 is a first block diagram of an assembly relationship between a circular square tube body and a beam splitter of an optical module according to some embodiments;

FIG. 38 is a second block diagram of an assembly relationship between a round square tube body and a beam splitter of an optical module according to some embodiments;

FIG. 39 is a third block diagram of an assembly relationship between a round square tube body and a beam splitter of an optical module according to some embodiments;

FIG. 40 is a fourth block diagram of an assembly relationship between a round square tube body and a beam splitter of an optical module according to some embodiments;

FIG. 41 is a fifth block diagram of an assembly relationship between a circular square tube body and a beam splitter of an optical module according to some embodiments;

FIG. 42 is a diagram illustrating a sixth embodiment of an assembly relationship between a circular square tube body and a beam splitter of an optical module;

FIG. 43 is a block diagram of a light absorbing sheet support member inside a round square tube body of an optical module according to some embodiments;

FIG. 44 is a block diagram of a light absorbing sheet support member inside a round square tube body of an optical module according to some embodiments;

FIG. 45 is an assembly relationship diagram of a light absorbing sheet support member and a light absorbing sheet of a light module according to some embodiments;

FIG. 46 is a cross-sectional view of an assembly relationship of a light absorbing sheet support member and a light absorbing sheet of a light module according to some embodiments;

FIG. 47 is a cross-sectional view of an assembly relationship of a light absorbing sheet support member and a light absorbing sheet of a light module according to some embodiments;

FIG. 48 is an exploded view of an assembly of a light absorbing sheet support member and a light absorbing sheet of a light module according to some embodiments;

FIG. 49 is an assembly relationship diagram of a light absorbing sheet support member and a round square tube body of an optical module according to some embodiments;

FIG. 50 is an exploded view of an assembly relationship of a light absorbing sheet support member and a round square tube body of an optical module according to some embodiments;

FIG. 51 is a cross-sectional view of an assembly relationship of a light absorbing sheet support member and a round square tube body of an optical module according to some embodiments;

FIG. 52 is an exploded view of an assembly of a light absorbing sheet support member and a round square tube body of an optical module according to some embodiments;

fig. 53 is a schematic view of an optical path of an optical module through a first filter and a baffle according to some embodiments;

fig. 54 is an assembly schematic diagram of a first filter and a baffle in a round square tube of an optical module according to some embodiments;

FIG. 55 is a block diagram of a round square tube body of an optical module for assembly of a baffle according to some embodiments;

fig. 56 is an exploded view of an assembly of a first filter and a baffle in a round square tube of an optical module according to some embodiments;

fig. 57 is an exploded view of an assembly of a first filter and a baffle in a round square tube of an optical module according to some embodiments;

fig. 58 is a schematic diagram of a relative arrangement of a first filter and a baffle of an optical module according to some embodiments;

FIG. 59 is an exploded view of the relative arrangement of the first filter and the baffle of an optical module according to some embodiments;

fig. 60 is a schematic diagram illustrating an assembly relationship between a second filter of an optical module and a circular square tube according to some embodiments;

fig. 61 is an enlarged view of a second filter of an optical module in mating relationship with a round square tube according to some embodiments;

Fig. 62 is an exploded view of a second filter of an optical module in mating relationship with a round square tube body, in accordance with some embodiments;

fig. 63 is an overall view of a second filter of an optical module in a round square tube, according to some embodiments;

FIG. 64 is a schematic diagram illustrating an assembly relationship between a reflector plate and a circular square tube of an optical module according to some embodiments;

FIG. 65 is an exploded view of an assembly relationship of a reflector plate and a round square tube of an optical module according to some embodiments;

fig. 66 is a block diagram of a round square tube body of an optical module for assembling a third filter according to some embodiments;

fig. 67 is a schematic diagram illustrating an assembly relationship between a circular square tube body and a third filter of an optical module according to some embodiments.

Detailed Description

In an optical communication system, an optical signal is used to carry information to be transmitted, and the optical signal carrying the information is transmitted to an information processing device such as a computer through an information transmission device such as an optical fiber or an optical waveguide, so as to complete the transmission of the information. Since light has a passive transmission characteristic when transmitted through an optical fiber or an optical waveguide, low-cost, low-loss information transmission can be realized. Further, since a signal transmitted by an information transmission device such as an optical fiber or an optical waveguide is an optical signal and a signal that can be recognized and processed by an information processing device such as a computer is an electrical signal, it is necessary to perform mutual conversion between the electrical signal and the optical signal in order to establish an information connection between the information transmission device such as an optical fiber or an optical waveguide and the information processing device such as a computer.

The optical module realizes the function of interconversion between the optical signal and the electric signal in the technical field of optical communication. The optical module comprises an optical port and an electric port, the optical module realizes optical communication with information transmission equipment such as optical fibers or optical waveguides through the optical port, realizes electric connection with an optical network terminal (for example, optical cat) through the electric port, and the electric connection is mainly used for power supply, I2C signal transmission, data information transmission, grounding and the like; the optical network terminal transmits the electric signal to information processing equipment such as a computer through a network cable or wireless fidelity (Wi-Fi).

Fig. 1 is a connection diagram of an optical communication system. As shown in fig. 1, the optical communication system includes a remote server 1000, a local information processing device 2000, an optical network terminal 100, an optical module 200, an optical fiber 101, and a network cable 103.

One end of the optical fiber 101 is connected to the remote server 1000, and the other end is connected to the optical network terminal 100 through the optical module 200. The optical fiber itself can support long-range signal transmission, such as several kilometers (6 kilometers to 8 kilometers), on the basis of which, if a repeater is used, it is theoretically possible to achieve unlimited distance transmission. Thus, in a typical optical communication system, the distance between the remote server 1000 and the optical network terminal 100 may typically reach several kilometers, tens of kilometers, or hundreds of kilometers.

One end of the network cable 103 is connected to the local information processing device 2000, and the other end is connected to the optical network terminal 100. The local information processing apparatus 2000 may be any one or several of the following: routers, switches, computers, cell phones, tablet computers, televisions, etc.

The physical distance between the remote server 1000 and the optical network terminal 100 is greater than the physical distance between the local information processing apparatus 2000 and the optical network terminal 100. The connection between the local information processing apparatus 2000 and the remote server 1000 is completed by an optical fiber 101 and a network cable 103; and the connection between the optical fiber 101 and the network cable 103 is made by the optical module 200 and the optical network terminal 100.

The optical module 200 includes an optical port configured to access the optical fiber 101 such that the optical module 200 establishes a bi-directional optical signal connection with the optical fiber 101; the electrical port is configured to be accessed into the optical network terminal 100 such that the optical module 200 establishes a bi-directional electrical signal connection with the optical network terminal 100. The optical module 200 performs mutual conversion between optical signals and electrical signals, so that an information connection is established between the optical fiber 101 and the optical network terminal 100. Illustratively, the optical signal from the optical fiber 101 is converted into an electrical signal by the optical module 200 and then input to the optical network terminal 100, and the electrical signal from the optical network terminal 100 is converted into an optical signal by the optical module 200 and input to the optical fiber 101. Since the optical module 200 is a tool for implementing the mutual conversion between the optical signal and the electrical signal, it has no function of processing data, and the information is not changed during the above-mentioned photoelectric conversion process.

The optical network terminal 100 includes a substantially rectangular parallelepiped housing (housing), and an optical module interface 102 and a network cable interface 104 provided on the housing. The optical module interface 102 is configured to access the optical module 200, so that the optical network terminal 100 and the optical module 200 establish a bidirectional electrical signal connection; the network cable interface 104 is configured to access the network cable 103 such that the optical network terminal 100 establishes a bi-directional electrical signal connection with the network cable 103. A connection is established between the optical module 200 and the network cable 103 through the optical network terminal 100. Illustratively, the optical network terminal 100 transmits an electrical signal from the optical module 200 to the network cable 103, and transmits an electrical signal from the network cable 103 to the optical module 200, so that the optical network terminal 100, as a host computer of the optical module 200, can monitor the operation of the optical module 200. The upper computer of the optical module 200 may include an optical line terminal (Optical Line Terminal, OLT) or the like in addition to the optical network terminal 100.

The remote server 1000 establishes a bidirectional signal transmission channel with the local information processing device 2000 through the optical fiber 101, the optical module 200, the optical network terminal 100 and the network cable 103.

Fig. 2 is a block diagram of an optical network terminal, and fig. 2 shows only the configuration of the optical network terminal 100 related to the optical module 200 in order to clearly show the connection relationship between the optical module 200 and the optical network terminal 100. As shown in fig. 2, the optical network terminal 100 further includes a circuit board 300 disposed in the housing, a cage 106 disposed on a surface of the circuit board 300, a heat sink 107 disposed on the cage 106, and an electrical connector disposed inside the cage 106. The electrical connector is configured to access an electrical port of the optical module 200; the heat sink 107 has a convex portion such as a fin that increases the heat dissipation area.

The optical module 200 is inserted into the cage 106 of the optical network terminal 100, the optical module 200 is fixed by the cage 106, and heat generated by the optical module 200 is transferred to the cage 106 and then diffused through the heat sink 107. After the optical module 200 is inserted into the cage 106, the electrical port of the optical module 200 is connected with an electrical connector inside the cage 106, so that the optical module 200 and the optical network terminal 100 propose a bi-directional electrical signal connection. In addition, the optical port of the optical module 200 is connected to the optical fiber 101, so that the optical module 200 establishes a bi-directional optical signal connection with the optical fiber 101.

Fig. 3 is a block diagram of an optical module according to some embodiments. As shown in fig. 3, the optical module 200 includes a housing (shell), a circuit board 300 disposed in the housing, and an optical transceiver module.

The housing includes an upper housing 201 and a lower housing 202, the upper housing 201 being covered on the lower housing 202 to form the above-mentioned housing having two openings; the outer contour of the housing generally presents a square shape.

In some embodiments of the present disclosure, the lower housing 202 includes a bottom plate 2021 and two lower side plates 2022 disposed at both sides of the bottom plate 2021 and perpendicular to the bottom plate 2021; the upper housing 201 includes a cover 2011, and the cover 2011 is covered on two lower side plates 2022 of the lower housing 202 to form the housing.

In some embodiments, the lower housing 202 includes a bottom plate 2021 and two lower side plates 2022 disposed on both sides of the bottom plate 2021 and perpendicular to the bottom plate 2021; the upper housing 201 includes a cover 2011 and two upper side plates disposed on two sides of the cover 2011 and perpendicular to the cover 2011, and the two upper side plates are combined with two lower side plates 2022 to cover the upper housing 201 on the lower housing 202.

The direction in which the two openings 204 and 205 are connected may be the same as the longitudinal direction of the optical module 200 or may be different from the longitudinal direction of the optical module 200. For example, opening 204 is located at the end of light module 200 (right end of fig. 3) and opening 205 is also located at the end of light module 200 (left end of fig. 3). Alternatively, the opening 204 is located at the end of the light module 200, while the opening 205 is located at the side of the light module 200. The opening 204 is an electrical port, and the golden finger of the circuit board 300 extends out of the opening 204 and is inserted into a host computer (e.g., the optical network terminal 100); the opening 205 is an optical port configured to access the external optical fiber 101 such that the external optical fiber 101 connects to an optical transceiver component inside the optical module 200.

The assembly mode of combining the upper shell 201 and the lower shell 202 is adopted, so that devices such as the circuit board 300 and the optical transceiver component are conveniently installed in the shell, and packaging protection is formed on the devices by the upper shell 201 and the lower shell 202. In addition, when devices such as the circuit board 300 and the optical transceiver assembly are assembled, the positioning component, the heat dissipation component and the electromagnetic shielding component of the devices are convenient to deploy, and the automatic production implementation is facilitated.

In some embodiments, the upper housing 201 and the lower housing 202 are generally made of metal materials, which is beneficial to electromagnetic shielding and heat dissipation.

In some embodiments, the optical module 200 further includes an unlocking member 203 located outside the housing thereof, and the unlocking member 203 is configured to achieve a fixed connection between the optical module 200 and the host computer, or to release the fixed connection between the optical module 200 and the host computer.

Illustratively, the unlocking component is located on the outer walls of the two lower side plates 2022 of the lower housing 202, with a snap-in component that mates with an upper computer cage (e.g., cage 106 of the optical network terminal 100). When the optical module 200 is inserted into the cage of the upper computer, the optical module 200 is fixed in the cage of the upper computer by the clamping component of the unlocking component; when the unlocking component is pulled, the clamping component of the unlocking component moves along with the unlocking component, so that the connection relation between the clamping component and the upper computer is changed, the clamping relation between the optical module 200 and the upper computer is relieved, and the optical module 200 can be pulled out of the cage of the upper computer.

The circuit board 300 includes circuit traces, electronic components and chips, which are connected together by the circuit traces according to a circuit design to realize functions such as power supply, electrical signal transmission, and grounding. The electronic components include, for example, capacitors, resistors, transistors, metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET). The chips include, for example, a micro control unit (Microcontroller Unit, MCU), a laser driving chip, a limiting amplifier (limiting amplifier), a clock data recovery (Clock and Data Recovery, CDR) chip, a power management chip, a digital signal processing (Digital Signal Processing, DSP) chip.

The circuit board 300 is generally a hard circuit board, and the hard circuit board can also realize a bearing function due to the relatively hard material, for example, the hard circuit board can stably bear the electronic components and chips; when the optical transceiver component is positioned on the circuit board, the hard circuit board can also provide stable bearing; the hard circuit board can also be inserted into an electrical connector in the upper computer cage.

The circuit board 300 further includes a gold finger formed on an end surface thereof, the gold finger being composed of a plurality of pins independent of each other. The circuit board 300 is inserted into the cage 106 and is conductively connected to the electrical connectors within the cage 106 by the gold fingers. The golden finger can be arranged on the surface of one side of the circuit board 300 (such as the upper surface shown in fig. 4) or on the surfaces of the upper side and the lower side of the circuit board 300, so as to adapt to the occasion with large pin number requirements. The golden finger is configured to establish electrical connection with the upper computer to achieve power supply, grounding, I2C signal transmission, data signal transmission and the like.

Of course, flexible circuit boards may also be used in some optical modules. The flexible circuit board is generally used in cooperation with the rigid circuit board to supplement the rigid circuit board. For example, a flexible circuit board may be used to connect the hard circuit board and the optical transceiver.

The optical transceiver assembly includes a light emitting device configured to implement emission of an optical signal and a light receiving device configured to implement reception of the optical signal. Illustratively, the light emitting device and the light receiving device are combined together to form an integral light transceiving component.

The light emitting device and the light receiving device are encapsulated by TO, and the light emitting device and the light receiving device can be electrically connected with the circuit board 300 through a flexible circuit board, one end of the flexible circuit board is electrically connected with the light emitting device or the light receiving device, and the other end of the flexible circuit board is electrically connected with the circuit board 300.

The optical module may have a plurality of functions, such as OSC (Optical supervisory channel ) for transmitting supervisory information.

The optical module may have a plurality of functions, such as an OTDR (Optical Time Domain Reflectometer, optical time domain reflection) function, where the OTDR transmits an optical pulse into an optical fiber, and when the optical pulse is transmitted in the optical fiber, scattering and reflection occur due to the property of the optical fiber itself, abnormal optical links such as a connector, an interruption or a bend, and a part of the scattered optical signal and the reflected optical signal will return to the OTDR, and the OTDR determines whether the optical link is abnormal according to the time domain characteristics of the received scattered optical signal and the reflected optical signal.

An optical module system having an OTDR function generally includes a pair of optical modules having an OTDR function, which are referred to as a first optical module and a second optical module, respectively, and the first optical module includes, for example, a first OTDR BOSA and a first oscrosa and the second optical module includes a second OTDR BOSA and a second oscrosa in the prior art. The first OTDR BOSA transmits first wavelength light and receives the first wavelength light reflected back due to the abnormal optical link; the first OSC ROSA receives the second wavelength light. The second OTDR BOSA transmits second wavelength light and receives the second wavelength light reflected back due to the abnormal optical link; the second OSC ROSA receives the first wavelength light. In the prior art, the OTDR BOSA and the OSC ROSA are arranged in two different tubes, so that the occupied area is large, and the miniaturization development of an optical module is not facilitated.

In this embodiment, the OTDR BOSA and the OSC ROSA are provided in the same tube, which is more compact.

As shown in fig. 5, in the embodiment of the present application, the optical module includes a light emitting device 500, a first light receiving device 600, a second light receiving device 700, a round square tube 400, and an optical fiber adapter 900. The light emitting device 500, the first light receiving device 600, the second light receiving device 700, and the optical fiber adapter 900 are respectively provided on the side walls of the circular square tube 400.

Fig. 31, 32 and 33 show the structure of a circular square tube 400, a first tube orifice 410 is arranged on a first side wall of the circular square tube 400, a second tube orifice 420 is arranged on a second side wall, a third tube orifice 430 and a fourth tube orifice 440 are respectively arranged on a third side wall, and a fifth tube orifice 450 is arranged on a fourth side wall; the first side wall and the fourth side wall are oppositely arranged and are positioned in the length direction of the round square tube 400, and the second side wall and the third side wall are oppositely arranged and are positioned in the width direction of the round square tube 400; further, the first nozzle 410 protrudes with respect to the circular square tube 400.

As shown in fig. 11, the light emitting device 500 is connected to the circular square tube 400 through a connection sleeve 510; the end surface area of the connecting sleeve 510 is larger than that of the light emitting device 500, so that the connecting sleeve 510 can facilitate welding of the light emitting device 500 and the round square tube 400, and can increase the welding area between the light emitting device 500 and the round square tube 400 and increase welding firmness; the light emitting device 500 is embedded in the connection sleeve 510, and the embedded structure is shown in fig. 14; then the end face of the connecting sleeve 510 is welded with the end face of the first pipe orifice 410, so as to realize mechanical leveling and mechanical connection; in the embodiment of the present application, since the first lens 543 is disposed in the light emitting device 500, the first lens 543 is a collimating lens, and the light emitted by the light emitting device 500 is parallel light, so that the light emitting device 500 performs XY plane coupling; when in coupling, the round square tube 400 is used as a reference, the light emitting device 500 and the connecting sleeve 510 are coupled in an XY plane, and the light emitting device is coupled to the maximum light emitting power; specifically, the light emitting device 500 is embedded into the connection sleeve 510, and then XY plane coupling is performed, and when the coupling is performed to the maximum light emission power, the end face of the connection sleeve 510 and the end face of the first nozzle 410 are welded, so as to achieve mechanical leveling and mechanical connection. Here, the XY plane refers to a line from the light emitting device 500 to the optical fiber adapter 900 in fig. 11 as an axis, and a plane perpendicular to the axis is the XY plane. As can be seen from fig. 12 and 13, the relative positional relationship between the end face of the connecting sleeve 510 and the end face of the first nozzle 410, the mechanical leveling and mechanical welding can be performed well between the end face of the connecting sleeve 510 and the end face of the first nozzle 410. Further, when the first nozzle 410 protrudes with respect to the circular square tube body 400, the welding between the connection sleeve 510 and the circular square tube body 400 is facilitated, and when the first nozzle 410 does not protrude with respect to the circular square tube body 400, the connection sleeve 510 and the first side wall of the circular square tube body 400 may be welded together.

As shown in fig. 16, the first light receiving device 600 is embedded inside the second nozzle 420; as shown in fig. 17, the second light receiving device 700 is embedded inside the third nozzle 430.

As shown in fig. 11, 12 and 13, the optical fiber adapter 900 is connected with the round square tube 400 through the adjusting sleeve 910, and the adjusting sleeve 910 can better connect the optical fiber adapter 900 with the round square tube 400 on one hand, and facilitate optical coupling, particularly Z-axis coupling, of the optical fiber adapter 900 on the other hand; the fiber optic adapter 900 is inserted into the adjustment sleeve 910, the structure after insertion being as shown in fig. 15; then the end surface of the adjusting sleeve 910 is welded with the side wall where the fifth pipe orifice 450 is positioned, so as to realize mechanical leveling and mechanical connection; in this embodiment, the light emitted from the optical fiber adapter 900 is convergent light, and the light entering the optical fiber adapter 900 is also convergent light, so that the optical fiber adapter 900 performs XYZ coupling, and when coupling is performed, the optical fiber adapter 900 performs XYZ-direction coupling with the circular square tube 400 as a reference, and is coupled to the maximum light emission power; specifically, the optical fiber adapter 900 is embedded into the adjusting sleeve 910, the adjusting sleeve 910 performs XY plane coupling along with the optical fiber adapter 900, meanwhile, the optical fiber adapter 900 also performs Z axis coupling, when the coupling is maximum, the side surface of the adjusting sleeve 910 and the side wall of the optical fiber adapter 900 are penetration welded, then the adjusting sleeve 910 and the side wall of the fifth pipe orifice 450 are mechanically attached and flattened, then XY plane coupling is performed, and when the coupling is maximum, the end surface of the adjusting sleeve 910 and the side wall of the fifth pipe orifice 450 are welded; as can be seen from fig. 15, the optical fiber adapter 900 includes an optical fiber ferrule 920, when the optical fiber adapter 900 is coupled along the Z axis, the optical fiber adapter 900 is adjusted along the adjusting sleeve 910 along the Z axis, and a small portion of the end of the optical fiber ferrule 920 enters the inside of the circular square tube 400, so that a second cavity 407 is disposed at the end of the circular square tube 400, and the second cavity 407 provides a movable space for the optical fiber ferrule 920 when the optical fiber adapter 900 is coupled along the Z axis; when the fiber optic adapter 900 is coupled, the end of the fiber stub 920 may extend more or less into the second cavity 407. Note that, in the XYZ direction, a line from the light emitting device 500 to the optical fiber adapter 900 in fig. 11 is an axis, and a plane perpendicular to the axis, which is a Z axis extending direction, is an XY plane.

In order to prevent light from returning along the original light path, the light is not vertically incident to the end face of the optical fiber in the light path design; to achieve non-normal incidence of light to the end face of the fiber, the end face of the fiber is ground to an inclined plane, specifically, the fiber is wrapped in ceramic to form the fiber ferrule 920, the end face of the fiber ferrule 920 is ground to an inclined plane, and the end face of the fiber in the fiber ferrule 920 is then inclined plane.

As shown in fig. 6 and 7, the circular square tube 400 has an optical element inside, and an optical isolator 810, a spectroscopic plate 820, a light absorbing plate 830, a first filter 850, a baffle 840, a second filter 860, a reflection plate 870, a third filter 880, and a second lens 890 are provided in this order. The second lens 890 has a converging effect toward an end surface (first end surface) inside the circular square tube body 400, has a collimating effect toward an end surface (second end surface) outside the circular square tube body 400, and emits parallel light from the light emitting device 500 to perform long-distance transmission in a parallel light state; when entering the fiber optic adapter 900 through the second lens 890, the first end face of the second lens 890 converts the parallel light into converging light, which enters the fiber through the fiber optic adapter 900; when external light (condensed light) enters the optical fiber adapter 900, the second end surface of the second lens 890 converts the condensed light into parallel light, which enters the circular square tube 400. The optical axes of the optical isolator 810 and the light-splitting sheet 820 are positioned on the same horizontal line, the light absorbing sheet 830 and the first filter 850 are respectively arranged at two sides of the light-splitting sheet 820, the light absorbing sheet 830 is arranged on a reflection light path of the first wavelength emitted light passing through the light-splitting sheet 820, and the first filter 850 is arranged in the reverse direction of the reflection light path of the first wavelength emitted light passing through the light-splitting sheet 820; the second filter 860 is positioned on the same horizontal line as the optical axis of the light-splitting sheet 820, the reflective sheet 870 is disposed on the optical path of the second filter 860 for the OSC data light, and the third filter 880 is disposed on the optical path of the reflective sheet 870 for the OSC data light. The optical components of the optical isolator 810, the optical splitter 820, the light absorbing sheet 830, the first filter 850, the baffle 840, the second filter 860, the reflecting sheet 870, the third filter 880 and the second lens 890 can realize the emission of the emitted light of the first wavelength, the reception of the reflected light of the OTDR, and the reception of the OSC data light, so that the OTDR and the OSC double channels are simultaneously arranged in the circular square tube 400.

In this embodiment of the present application, the light emitted by the light emitting device 500 is OTDR reflected light, when the OTDR reflected light emitted by the light emitting device is transmitted in an optical fiber, the OTDR reflected light reflected back when an optical fiber link is abnormal is transmitted through the optical fiber adapter 900, and finally transmitted into the first light receiving device 600, and then OTDR detection is performed; the second wavelength light emitted by the opposite-end optical module is transmitted to the second light receiving device 700 through the optical fiber adapter 900; the first wavelength is a different wavelength than the second wavelength; the first wavelength light emitted from the light emitting device 500 is referred to as OTDR emission light, the first wavelength light reflected to the first light receiving device 600 is referred to as OTDR reflection light, and the second wavelength light transmitted to the second light receiving device 700 is referred to as OSC data light. The light splitting sheet 820 is semi-transparent and semi-reflective for light of the first wavelength; the second filter 860 transmits the first wavelength and reflects the second wavelength; the reflective sheet 870 reflects the second wavelength; the first filter 850 allows light transmission only at a first wavelength and does not allow transmission at other wavelengths; the third filter 880 allows only light of the second wavelength to be transmitted, and does not allow other wavelengths to be transmitted.

The OTDR emits light, and the wavelength is a first wavelength and is used for OTDR detection; when the light passes through the optical isolator 810 and then passes through the light splitting sheet 820, part of the OTDR emission light is transmitted through the light splitting sheet 820 to obtain first light splitting of the OTDR emission light, and part of the OTDR emission light is reflected by the light splitting sheet 820 to obtain second light splitting of the OTDR emission light; the OTDR emission light reflected by the optical splitter 820 (i.e., the OTDR emission light second optical splitter) causes crosstalk to the first optical receiving device 600, so the OTDR emission light second optical splitter is crosstalk light; because crosstalk light is diffusely reflected in the circular square tube 400 and enters the first light receiving device 600 to cause crosstalk, the crosstalk can affect an attenuation blind area of the OTDR, so that the attenuation blind area of the OTDR is larger to affect the monitoring performance of the OTDR, therefore, the light absorbing sheet 830 is arranged on a light path of the OTDR emitted light reflected by the light splitting sheet 820, and the light absorbing sheet 830 can absorb the crosstalk light to avoid interference of the crosstalk light entering the first light receiving device 600. Part of the OTDR emission light is transmitted through the beam splitter 820, then transmitted through the second filter 860, and enters the second lens 890, where the second lens 890 is set as a converging lens, and after passing through the second lens 890, the converging light is emitted out through the optical fiber adapter 900.

The OTDR reflects light, the wavelength is the first wavelength, it is reflected back when encountering the unusual situation in the transmission in the optical fiber link by OTDR emission light; transmitted through the optical fiber adapter 900, enters the inside of the round square tube 400 after passing through the second lens 890, is transmitted through the second filter 860 to the light splitting sheet 820, and is respectively subjected to transmission and reflection by the light splitting sheet 820 to obtain first light splitting of OTDR reflected light and second light splitting of OTDR reflected light; the OTDR reflected light second split reaches the first filter 850, thereby entering the first light receiving device 600; the first light splitting of the OTDR reflected light reaches the optical isolator 810, and under the effect of the optical isolator 810, stray light entering the light emitting device 500 is isolated, so that the stray light is prevented from affecting the quality of the emitted light signal of the light emitting device 500, and the emission performance of the light emitting device 500 is improved. Wherein the optical isolator 810 is used not only to prevent the OTDR-emitted light from returning to the light emitting device 500 along the original path, but also to prevent the OTDR-reflected light from first splitting light from being injected into the light emitting device 500. The presence of the optical isolator 810 may improve the emission performance of the light emitting device 500, thereby improving the OTDR detection performance.

OSC data light with a second wavelength is transmitted through the optical fiber adapter 900, enters the inside of the circular square tube 400 after passing through the second lens 890, and is reflected by the second filter 860 to change the transmission direction of the light; the light reaches the reflective sheet 870, is reflected by the reflective sheet 870, changes the transmission direction of the light again, reaches the third filter 880, and the third filter 880 transmits the OSC data light, so that the OSC data light reaches the second light receiving device 700. Further, the second filter 860 is an 11 ° filter, that is, an included angle between the incident light and the normal line of the second filter 860 is 11 °, an included angle between the outgoing light and the normal line is 11 °, and then an included angle between the incident light and the outgoing light of the second filter 860 is 22 °; the reflective sheet 870 is a 34 ° reflective sheet, that is, the included angle between the incident light and the normal line of the reflective sheet 870 is 34 °, the included angle between the emergent light and the normal line is 34 °, and then the included angle between the incident light and the emergent light of the reflective sheet 870 is 68 °; finally, the transmission direction of the OSC data light is changed by 90 °, that is, the OSC data light horizontally enters the second filter 860, passes through the reflective sheet 870, and then vertically enters the third filter 880, and the third filter 880 transmits the OSC data light, so that the OSC data light reaches the second light receiving device 700. Therefore, in the embodiment of the present application, the transmission direction of OSC data light is adjusted from the horizontal transmission along the optical axis direction of the optical fiber adapter 900 to the transmission along the direction perpendicular to the third filter 880 by the combination of the 11 ° second filter 860 and the 34 ° reflection sheet 870.

In this embodiment of the present application, at the transmitting end, the OTDR transmits light to be transmitted through the beam splitter 820, and at the receiving end, the OTDR reflects light to be reflected through the beam splitter 820, so as to change the transmission direction of the light and enter the first light receiving device 600, so that the beam splitter 820 is set to be semi-transparent and semi-reflective; the semi-transparent and semi-reflective means the equipartition on the optical power, and the wavelength of the two light beams after the light splitting is the same as the wavelength of the light before the light splitting, namely the wavelength of the light before and after the light splitting is not changed; in order to prevent the second split light of the OTDR emission light from entering the first light receiving device 600 to affect the OTDR detection performance when the OTDR emission light is emitted, a light absorbing sheet 830 is provided; in order to avoid that the first split of the OTDR reflected light enters the light emitting device 500 to affect the emission performance when receiving the OTDR reflected light, an optical isolator 810 is provided; in order to prevent light of the second wavelength from entering the first light receiving device 600, a first filter 850 is provided, the first filter 850 allowing only light of the first wavelength to be transmitted and not allowing light of other wavelengths to be transmitted; in order to prevent light of the first wavelength from entering the second light receiving device 700, a third filter 880 is provided, the third filter 880 allowing light of the second wavelength to be transmitted only and not allowing light of other wavelengths to be transmitted; therefore, each structural design of this application ingenious, the ring is buckled mutually, mutually support.

Fig. 8, 9, and 10 are schematic optical paths of OTDR emission light, OTDR reflection light, and OSC data light, respectively.

Fig. 8 shows a light path design of OTDR emission light, where the OTDR emission light sequentially passes through an optical isolator 810, a beam splitter 820, a second filter 860, and a second lens 890, reaches an optical fiber adapter 900, and is then emitted into an optical fiber through the optical fiber adapter 900; although the second spectrum of the light emitted by the OTDR (i.e., the crosstalk light described above) is mostly absorbed by the light absorbing sheet 830, a small portion of the second spectrum is not absorbed by the light absorbing sheet 830, and the light not absorbed by the light absorbing sheet 830 is present in the square-round tube 400 and is diffusely reflected; for this purpose, a baffle 840 is arranged in the reverse direction of the optical path of the second split light emitted by the OTDR, and a first filter 850 is arranged on the lower surface of the baffle 840; as shown in fig. 58 and 59, the baffle 840 is provided with a first light hole 841 and a mounting groove 842, the first light hole 841 is formed by recessing the upper surface of the baffle 840 downwards until the first filter is exposed, and the mounting groove 842 is formed by recessing the lower surface of the baffle 840 upwards until the first filter 850 can be mounted; specifically, the first light hole 841 is disposed in the center of the baffle 840, and is a through hole, the mounting groove 842 is centered on the first light hole 841, the lower surface of the baffle 840 is recessed upward, and the extending diameter extending toward the outer peripheral direction of the baffle 840 is larger than the inner diameter of the first light hole 841, so that the inner diameter of the first light hole 841 is smaller than the mounting groove 842; the first light transmission hole 841 is configured to allow the OTDR reflected light to be transmitted to the surface of the first filter 850 for transmission to the inside of the first light receiving device 600; the mounting groove 842 is used for mounting the first filter 850, and since the extending diameter of the mounting groove 842 is larger than the inner diameter of the first light transmitting hole 841, the first filter 850 can be disposed on the upper surface of the mounting groove 842. In order to prevent crosstalk light from being incident into the first light receiving device 600, an absorbing layer is provided on the surface of the barrier 840, and the edge of the barrier 840 is hermetically connected to the inside of the circular square tube 400 by a black gel. The absorbing layer is a structural layer obtained by blackening the barrier 840. On the one hand, the absorption layer on the surface of the baffle 840 can absorb crosstalk light, and on the other hand, since the edge of the baffle 840 is hermetically connected with the inside of the round square tube 400 through the black glue, the crosstalk light, and any light belonging to stray light for the first light receiving device 600 can be blocked or intercepted; the interference of the crosstalk light and the stray light to the first light receiving device 600 is further reduced. Therefore, in the embodiment of the present application, most of the crosstalk light is absorbed by the light absorbing sheet 830, and the crosstalk light and the stray light are absorbed and intercepted by the baffle 840, so as to improve the receiving performance of the first light receiving device 600, so as to improve the detection accuracy of the OTDR. The stray light may be the second wavelength reflected light, when entering the second filter 860, while most of the second wavelength reflected light may be reflected by the second filter 860, a small portion of the second wavelength reflected light is transmitted by the second filter 860, and the portion of the second wavelength reflected light transmitted by the second filter 860 is stray light for the first light receiving device 600.

In fig. 9, the optical path design of the OTDR reflected light is shown, the OTDR reflected light is sequentially transmitted to the optical splitter 820 through the optical fiber adapter 900, the second lens 890 and the second filter 860, part of the OTDR reflected light is reflected by the optical splitter 820 and is emitted into the first filter 850 to reach the first light receiving device 600, part of the OTDR reflected light is transmitted by the optical splitter 820 and is emitted into the optical isolator 810, and the isolation effect of the optical isolator 810 prevents the OTDR reflected light from entering the light emitting device 500, thereby improving the emission performance of the light emitting device 500.

Fig. 10 shows the optical path design of OSC data light, which is transmitted through the optical fiber adapter 900, converged by the second lens 890, enters the inside of the circular square tube 400, and is reflected by the second filter 860, so as to change the transmission direction of the light; the light reaches the reflective sheet 870, is reflected by the reflective sheet 870, changes the transmission direction of the light again, reaches the third filter 880, and the third filter 880 transmits the OSC data light, so that the OSC data light reaches the second light receiving device 700. In the embodiment of the present application, the transmission direction of OSC data light is adjusted from the horizontal transmission along the optical axis direction of the optical fiber adapter 900 to the transmission along the direction perpendicular to the third filter 880 by the combination of the 11 ° second filter 860 and the 34 ° reflection sheet 870.

Fig. 18-27 are schematic structural diagrams of a light emitting device 500 according to an embodiment of the present application. As shown in fig. 18, the light emitting device 500 is connected to the connection sleeve 510, and further connected to the round square tube 400 through the connection sleeve 510. The light emitting device 500 includes a cap 520 and a stem 530; the pipe cap 520 covers the surface of the pipe seat 530; a cavity is formed between the cap 520 and the stem 530; the surface of the tube seat 530 is provided with a boss 542; an optical window 541 is arranged between the boss 542 and the top end of the pipe cap. The surface of the boss 542 is provided with a first lens 543 and a laser chip 544, respectively. To avoid light signals emitted by laser chip 544 from being reflected back into laser chip 544 along the original path when passing through optical window 541, light emission performance is affected by light signals emitted by first lens 543 and optical window 541, and in some embodiments of the present application, optical window 541 is inclined at an angle relative to the top surface of the cap, and an inclination angle of 4 ° to 8 ° is formed between optical window 541 and the top surface of the cap (or the surface of tube base 530), so that light signals are prevented from being reflected back into laser chip 544 along the original path when passing through optical window 541.

A boss 542 having a first support surface 5421 and a second support surface 5422, wherein the first support surface 5421 is more recessed relative to the second support surface 5422, and the first support surface 5421 and the second support surface 5422 are arranged in a step manner, and a step 5423 is arranged between the first support surface 5421 and the second support surface 5422; the first support surface 5421 and the second support surface 5422 are respectively used for arranging the first lens 543 and the laser chip 544; the first lens 543 and the laser chip 544 are respectively stuck by glue, so that glue overflow occurs, and therefore, the step 5423 is obliquely arranged, and further, the step 5423 is inclined towards the inner side of the boss 542, so that the step 5423 has a glue guiding effect; when the first lens 543 is stuck, the overflow glue flows to the surface of the step 5423, so that the influence of the creeping glue on the coupling efficiency of the light emitting device 500 is prevented. Further, in the embodiment of the present application, the boss 542 and the tube seat 530 are integrally disposed, so as to ensure that concentricity of the first lens 543 and the laser chip 544 carried on the surface of the boss 542 is fixed relative to the tube seat 530, thereby increasing light emission coupling efficiency.

A first lens 543, which is a collimating lens, and the laser chip 544 emits a divergent light beam, and the first lens 543 is configured to convert the divergent light beam into parallel light; then, the parallel light is transmitted inside the circular square tube 400, sequentially passes through the optical isolator 810, the light splitting sheet 820 and the second filter 860, and then is injected into the second lens 890, the second lens 890 converts the parallel light into converging light, and the converging light enters the fiber through the fiber adapter 900. In the related art, a converging lens is generally disposed inside the light emitting device 500 or near the light emitting device 500, and because a certain distance is provided between the light emitting device 500 and the optical fiber adapter 900, the focal length of the converging lens is longer, so that the optical coupling efficiency is lower, and the converging light coming out of the converging lens can enter the optical fiber after passing through the optical device, such as a filter, a reflector, etc., so that the converging light has loss such as insertion loss, return loss, etc., and the optical coupling efficiency is further reduced. In the embodiment of the present application, the second lens 890 is disposed between each optical element and the optical fiber adapter 900, so that the focal length angle of the second lens 890 is increased, and the optical coupling efficiency is further improved; after passing through each optical element, the parallel light is converted into converging light, so that the converging light is prevented from being influenced by each optical element to generate loss, and the optical coupling efficiency is further improved. Therefore, in the embodiment of the present application, the light emitting device 500 emits parallel light, and then the parallel light is transmitted inside the circular square tube 400 until the parallel light is transmitted to the second lens 890 disposed between each optical element and the optical fiber adapter 900, and the parallel light is converted into converging light, and the converging light directly enters the fiber through the optical fiber adapter 900.

As shown in fig. 7, in the embodiment of the present application, a first lens 543 is disposed inside the light emitting device 500, and a second lens 890 is disposed between each optical element in the circular square tube 400 and the optical fiber adapter 900; the first lens 543 and the second lens 890 form a dual-lens system of the optical transceiver; through the dual lens system, the light emitting device 500 emits parallel light by the first lens 543, and the light beam is always transmitted in a state of parallel light before the second lens 890 in the circular square tube 400; after passing through the optical elements, the parallel light is converted into converging light by the second lens 890, and the converging light is transmitted into the optical fiber adapter 900 to be further input into the fiber. According to the double-lens system, transmission in a parallel light state before fiber entering can be achieved, parallel light is converted into converging light when fiber entering, and fiber entering in a converging light state can be achieved. Through the dual lens system in this application, can reduce the focus of second lens 890, reduce simultaneously and assemble the light energy loss, and then improve the optical coupling efficiency, improve the light-emitting efficiency, and then promote OTDR emission performance.

The surface of the tube seat 530 is also provided with a cushion block 545, and the surface of the cushion block 545 is provided with a backlight detector 546; backlight detector 546 is configured to monitor the light output of laser chip 544 to ensure that the light output of laser chip 544 is maintained within a predetermined range; because backlight detector 546 has a photosensitive surface and is reflective, in order to prevent the light beam incident on backlight detector 546 from returning into laser chip 544 along the original path, but to affect the emission performance of laser chip 544, the surface of stem 530 has an inclined support surface 534, and inclined support surface 534 has an inclined angle with respect to the stem, specifically inclined support surface 534 is inclined upward toward the opposite surface of the top surface of stem 530; spacer 545 and backlight detector 546 are disposed on inclined support surface 534 to prevent light beam incident on backlight detector 546 from returning into laser chip 544 along the original path, thereby affecting the emission performance of laser chip 544.

The surface of the tube seat 530 is also provided with a first pin 551, a second pin 552, a third pin 553 and a fourth pin 554; the first pin 551 is a ground pin for realizing the grounding of the laser chip 544 and the backlight detector 546; the second pin 552 is a laser chip positive signal pin for transmitting high frequency signals; the third pin 553 is a laser chip negative electrode signal pin and is also a backlight detector negative electrode signal pin, and is used for transmitting high-frequency signals and realizing differential signal transmission; the fourth pin 554 is a positive signal pin of the backlight detector, and is used for transmitting high-frequency signals. Further, the positive electrode of laser chip 544 is electrically connected to second pin 552 via a gold wire, and the negative electrode is electrically connected to third pin 553 via a gold wire; the positive electrode of the backlight detector 546 is electrically connected to the fourth pin 554 via a gold wire, and the negative electrode is electrically connected to the third pin 553 via a gold wire. In order to shorten the wire bonding length between the positive electrode of the laser chip 544 and the second pin 552 and between the positive electrode of the backlight detector 546 and the fourth pin 554, the surfaces of the second pin 552 and the fourth pin 554 are respectively provided with a first metal block 5521 and a second metal block 5541, so as to shorten the wire bonding length and increase the high-frequency performance of signals.

As shown in fig. 26 and 27, the surface of the stem 530 is provided with a first pin through hole 531, a second pin through hole 532, and a third pin through hole 533, respectively; taking the third pin through hole 533 as an example, the third pin through hole 533 is used for setting the third pin 553; the third pin through hole 533 is disposed continuously with the inclined support surface 534, specifically, one end of the third pin through hole 533 is disposed continuously with the inclined support surface 534, the other end is inclined toward the top surface of the stem 530, and further the third pin through hole 533 is inclined toward two opposite directions, and the third pin through hole 533 is finally disposed in a heart shape.

In the embodiment of the present application, the light emitting device 500 is internally provided with a first lens 543, and a second lens 890 is arranged between each optical element in the circular square tube 400 and the optical fiber adapter 900; the first lens 543 and the second lens 890 form a dual-lens system of the optical transceiver; the optical coupling efficiency can be improved through the double-lens system, so that the light emitting efficiency is improved, and the OTDR light emitting performance is improved. The optical window 541 inside the optical device 500 is obliquely arranged, and the backlight detector 546 is obliquely arranged, so that the light beams entering the optical window 541 and the backlight detector 546 can be respectively prevented from returning into the laser chip 544 along the original path, and the optical emission performance of the OTDR is further improved.

Fig. 31, 32 and 33 show the structure of a circular square tube 400, a first tube orifice 410 is provided on a first side wall of the circular square tube 400, a second tube orifice 420 is provided on a second side wall, a third tube orifice 430 and a fourth tube orifice 440 are provided on a third side wall, and a fifth tube orifice 450 is provided on a fourth side wall.

Fig. 34 to 36 show the internal structure of the round square tube 400; the circular square tube 400 is provided with a first cavity 401, an isolator housing cavity 402, a beam splitter housing cavity 403, a second filter housing cavity 404, a reflector housing cavity 405, a second lens housing cavity 406, a second cavity 407, a first filter housing cavity 408, and a third filter housing cavity 409. The first cavity 401 is used to isolate the light emitting device 500 from the optical isolator 810 to avoid each other; the isolator-receiving cavity 402 is used to house an optical isolator 810; the light-splitting sheet accommodating cavity 403 is used for setting a light-splitting sheet 820; the second filter accommodating chamber 404 is used for disposing a second filter 860; the reflective sheet accommodation cavity 405 is used for disposing a reflective sheet 870; the second lens accommodation chamber 406 is used for disposing a second lens 890; the second cavity 407 is used to provide adjustable space for the coupling of the fiber optic adapter 900; the first filter housing cavity 408 is used for disposing the first filter 850; the third filter receiving chamber 409 is used to provide a third filter 880.

The first cavity 401 and the isolator-accommodating cavity 402 are adjacently arranged and are all arranged in the first pipe orifice 410, and the concave degree of the first cavity 401 towards the periphery of the round square pipe body 400 is larger than that of the isolator-accommodating cavity 402 towards the periphery of the round square pipe body 400; the first cavity 401 is configured to avoid interference caused by collision between the connection sleeve 510 of the light emitting device 500 and the optical isolator 810 during welding, and the first cavity 401 may enable the connection sleeve 510 and the optical isolator 810 to avoid each other.

The light-splitting sheet accommodating cavity 403 is used for accommodating a light-splitting sheet 820, as shown in fig. 34, one side wall of the light-splitting sheet accommodating cavity 403 is provided with a second light-transmitting hole 403a, and the other side wall is provided with a third light-transmitting hole 403b; the light-splitting sheet accommodating cavity 403, the second light-transmitting hole 403a and the third light-transmitting hole 403b are communicated; the OTDR emitted light from the light emitting device 500 is incident on the surface of the light-absorbing sheet 820 along the second light-transmitting hole 403a, and the OTDR emitted light is incident on the light-absorbing sheet 830 along the third light-transmitting hole 403b; when the OTDR reflected light is transmitted to the light splitting sheet 820, the first light split of the OTDR reflected light enters the optical isolator 810 along the second light transmitting hole 403a, and the other part of the OTDR reflected light is reflected by the light splitting sheet 820 to enter the first filter 850 and then enter the first light receiving device 600.

The second lens accommodating cavity 406 and the second cavity 407 are adjacently arranged, and the concave degree of the second cavity 407 towards the periphery of the round square tube 400 is larger than that of the second cavity 407 towards the periphery of the round square tube 400; the second cavity 407 is used to provide adjustable space for the coupling of the fiber optic adapter 900; specifically, when the optical fiber adapter 900 is coupled along the Z axis, a small portion of the end portion of the optical fiber ferrule 920 enters the inside of the round square tube 400, so the end portion of the round square tube 400 is provided with the second cavity 407, and the second cavity 407 provides a moving space for the optical fiber ferrule 920 when the optical fiber adapter 900 is coupled along the Z axis.

Based on the structure of the circular/square tube 400, the structure in which each optical element is provided in the circular/square tube 400 is shown in fig. 28 to 30. Fig. 28 shows the structure of an optical isolator 810 and a second lens 890. As shown in fig. 29 and 30, the optical isolator 810, the light splitting sheet 820, the light absorbing sheet 830, the first filter 850, and the baffle 840 constitute a first wavelength division system, and the second filter 860, the reflecting sheet 870, and the third filter 880 constitute a second wavelength division system.

Fig. 37 to 42 show the fitting relationship between the light-splitting sheet accommodation chamber 403 and the light-splitting sheet 820; as shown in fig. 37 and 38, the light splitting sheet 820 is provided in the light splitting sheet accommodating chamber 403; a second light hole 403a is formed in one side wall of the light-splitting sheet accommodating cavity 403, and a third light hole 403b is formed in the other side wall of the light-splitting sheet accommodating cavity; the light-splitting sheet accommodating cavity 403, the second light-transmitting hole 403a and the third light-transmitting hole 403b are communicated; the OTDR emitted light from the light emitting device 500 is incident on the surface of the light-absorbing sheet 820 along the second light-transmitting hole 403a, and the OTDR emitted light is incident on the light-absorbing sheet 830 along the third light-transmitting hole 403b; when the OTDR reflected light is transmitted to the light splitting sheet 820, a part of the OTDR reflected light is transmitted along the light splitting sheet 820, that is, the first light split of the OTDR reflected light is incident on the optical isolator 810 along the second light transmitting hole 403a, and another part of the OTDR reflected light is reflected by the light splitting sheet 820 to enter the first filter 850 and then enter the first light receiving device 600. As shown in fig. 39, a first inclined surface 403c is provided in the circular square tube 400, and the light-splitting sheet accommodating cavity 403 is formed by recessing the first inclined surface 403c from the bottom end of the inclined surface toward the second light-transmitting hole 403a, and a space obtained by recessing is used for embedding the light-splitting sheet 820; the light-splitting sheet accommodating cavity 403 includes a supporting surface 4031, a supporting surface 4032 and a sticking surface 4033; the concave rear side wall of the first inclined surface 403c is a supporting surface 4031, one side wall is a supporting surface 4032, and the other side wall is a sticking surface 4033; the structures of the first inclined surface 403c, the abutment surface 4031, the support surface 4032 and the abutment surface 4033 are as shown in fig. 42; the supporting surface 4031, the supporting surface 4032 and the attaching surface 4033 are perpendicular to each other, and the supporting surface 4031, the supporting surface 4032 and the attaching surface 4033 are combined into a body of the light sheet accommodating cavity 403; the supporting surface 4031 and the supporting surface 4032 form a right-angle clamping groove, namely a first right-angle clamping groove, the supporting surface 4032 and the attaching surface 4033 form another right-angle clamping groove, namely a second right-angle clamping groove, two adjacent side walls of the light splitting sheet 820 are embedded into the first right-angle clamping groove, two adjacent side walls are embedded into the second right-angle clamping groove, and the light splitting sheet 820 is attached to the attaching surface 4033 towards the side walls of the second light holes 403a and the third light holes 403b; thus, one side wall of the beam splitter is in supporting connection with the supporting surface 4031, one side wall of the beam splitter is in supporting connection with the supporting surface 4032, and one side wall of the beam splitter is in supporting connection with the attaching surface 4033 so as to realize the beam splitter 820; the light splitting sheet 820 is in parallel relation to the first inclined surface 403c, and the first inclined surface 403c is disposed at a preset inclination angle to match the inclination angle of the light splitting sheet 820, and in some embodiments of the present application, the inclination angle of the light splitting sheet 820 is 45 °. Further, the corresponding wall surfaces of the light splitting sheet 820 are respectively connected with the supporting surface 4031, the supporting surface 4032 and the attaching surface 4033 through glue adhesion, glue overflows during attaching to affect a light path, and the light splitting sheet 820 can warp or is not firmly attached, so that the middle position of the supporting surface 4032 in the embodiment of the application is sunken to obtain the glue overflow groove 4034, the overflowed glue can overflow into the glue overflow groove 4034 during attaching, adverse effects caused by the overflowed glue are avoided, and the existence of the glue overflow groove 4034 can provide an operation space for attaching after the light splitting sheet 820 is taken by the tweezers, so that the patch operation is facilitated.

Fig. 43 to 52 show the assembly relationship among the light absorbing sheet 830, the light absorbing sheet holder 830a, and the circular square tube 400; the light absorbing sheet holder 830a is used for carrying the light absorbing sheet 830; in some embodiments of the present application, the light absorbing sheet 830 and the light absorbing sheet bracket 830a are connected to obtain a whole, and the whole is connected to the circular square tube 400; the round square tube 400 is provided with a fourth tube orifice 440, and the fourth tube orifice 440 is used for embedding the light absorbing sheet bracket 830a; the light absorbing sheet holder 830a is shaped like a cap, the light absorbing sheet holder 830a includes a cover plate 830a4 and a column 830a5, the cover plate 830a4 is covered on the surface of the column 830a5, and the cover plate 830a4 protrudes relative to the column 830a 5; the column 830a5 is an asymmetric column with two ends, one end having a short length relative to the other end; the column 830a5 is provided with a mounting surface 830a1, the mounting surface 830a1 is formed by a relatively longer end of the column 830a5 being recessed toward the cover 830a4 at an oblique angle, the mounting surface 830a1 has an oblique angle with respect to the cover 830a4, and the mounting surface 830a1 is used for providing the light absorbing sheet 830; when the optical splitter 820 is used to split the light, part of the OTDR emission light is transmitted through the splitter 820, and part of the OTDR emission light is reflected by the splitter 820, and the OTDR emission light reflected by the splitter 820 is referred to as crosstalk light; since crosstalk light is diffusely reflected in the circular square tube 400 and enters the first light receiving device 600 to cause crosstalk to the OTDR, the light absorbing sheet 830 is disposed on the optical path of the second beam splitting of the OTDR light, and the light absorbing sheet 830 can absorb the crosstalk light, so as to avoid interference of the crosstalk light to the OTDR caused by the crosstalk light entering the first light receiving device 600. In this embodiment, the light absorbing sheet 830 is configured to absorb crosstalk light, but the light absorbing sheet 830 cannot absorb all the crosstalk light, and the light absorbing sheet 830 has a certain specular reflection, and reflects a part of the crosstalk light that is not absorbed, so that the light absorbing sheet 830 is obliquely disposed on the mounting surface 830a1, and when the light absorbing sheet 830 is obliquely disposed, the crosstalk light that is not absorbed can be prevented from being reflected onto the light splitting sheet 820 along the original path, and then reflected by the light splitting sheet 820 and returned into the light emitting device 500, so that the light absorbing sheet 830 is obliquely disposed, the crosstalk light that is not absorbed can be dispersed along other transmission directions, and the crosstalk light that is not absorbed is prevented from being returned into the light emitting device 500, thereby improving light emission performance. Further, the mounting surface 830a1 is a U-shaped mounting surface, the center of the mounting surface 830a1 is hollow, the two ends are solid surfaces, the light absorbing sheet 830 is adhered to the solid surfaces at the two ends of the mounting surface 830a1, when the light absorbing sheet 830 is adhered, the whole surface of the light absorbing sheet 830 is not contacted with the mounting surface 830a1 because the mounting surface 830a1 is hollow, if the whole surface of the light absorbing sheet 830 is contacted with the mounting surface 830a1, the crosstalk light not absorbed by the light absorbing sheet 830 can be reflected along the mounting surface 830a1, so that the crosstalk light reflection amount of the mounting surface 830a1 with a hollow design can be reduced; further, the hollow structure of the mounting face 830a1 is a third cavity 830a2, and the structure of the third cavity 830a2 is clearly seen in fig. 48; the solid surface end of the mounting surface 830a1 is provided with a first groove 830a3; when the light absorbing sheet 830 is adhered to the mounting surface 830a1 by using glue, the glue overflows under the action of gravity, and the overflowed glue can cause the light absorbing sheet 830 to warp or be adhered infirm, so that the first groove 830a3 is arranged to collect the overflowed glue, thereby avoiding adverse effects on the light absorbing sheet 830; the first groove 830a3 can also avoid the structural residue in processing, and ensure the mounting precision of the light absorbing sheet 830; because the light absorbing sheet 830 has a certain transmittance, a part of stray light can be transmitted, and the third cavity 830a2 can provide a diffuse reflection space for the transmitted crosstalk light, so that the transmitted crosstalk light is diffusely reflected in the third cavity 830a2, the energy of the crosstalk light is weakened, and the crosstalk light is prevented from being reflected out again through the light absorbing sheet 830.

The structure of the light absorbing sheet 830 connected to the light absorbing sheet bracket 830a is shown in fig. 45-47, and as shown in fig. 45-47, one end of the light absorbing sheet 830 is disposed at the first groove 830a3, and the arrangement of the first groove 830a3 can avoid structural residues in processing, so that the light absorbing sheet 830 and the light absorbing sheet bracket 830a can avoid each other, thereby ensuring the mounting accuracy of the light absorbing sheet 830. Fig. 49 and 50 show that the light absorbing sheet 830 is connected to the light absorbing sheet bracket 830a as a whole structure and then connected to the round square tube 400, specifically, the round square tube 400 is provided with a fourth tube opening 440, and the light absorbing sheet bracket 830a carries the light absorbing sheet 830 and is embedded in the fourth tube opening 440; further, as shown in fig. 51 and 52, the fourth nozzle 440 includes a cylinder receiving cavity 441 and a cover plate receiving cavity 442, and the shape of the cylinder receiving cavity 441 is adapted to the cylinder 830a5 for disposing the cylinder 830a5; the cover receiving cavity 442 is shaped to accommodate the cover 830a4 for providing the cover 830a4. The cylinder accommodating cavity 441 and the cover plate accommodating cavity 442 are arranged in a step manner, the inner diameter of the cylinder accommodating cavity 441 is larger than that of the cover plate accommodating cavity 442, and the height of the cylinder accommodating cavity 441 is larger than that of the cover plate accommodating cavity 442; the cover plate 830a4 and the column 830a5 of the light absorbing plate holder 830a are respectively inserted into the cover plate accommodating cavity 442 and the column accommodating cavity 441; further, the column accommodating cavity 441 is communicated with the third light hole 403b, so that the second light beam emitted by the OTDR is transmitted into the column accommodating cavity 441 along the third light hole 403 and then into the light absorbing sheet 830, and the light absorbing sheet 830 can absorb most of the second light beam emitted by the OTDR, and also can reflect and transmit a small part of the light (respectively referred to as reflected light and transmitted light), and by obliquely arranging the light absorbing sheet 830, the reflected light is dispersed along other transmission directions, so as to avoid the reflected light from returning into the light splitting sheet 820; the third cavity 830a2 provides a diffuse reflection space for the transmitted light, so that the transmitted crosstalk light is diffusely reflected in the third cavity 830a2, the energy of the crosstalk light is weakened, and the crosstalk light is prevented from being reflected out again through the light absorbing sheet 830.

Fig. 53 to 59 show the assembly relationship of the first filter 850, the baffle 840, and the round square tube 400, and as shown in fig. 53 to 59, the first filter 850 is disposed at the bottom end of the baffle 840 and is disposed in the second nozzle 420 of the round square tube 400. The first filter 850 and the baffle 840 are embedded in the second nozzle 420, and the first light receiving device 600 is also embedded in the second nozzle 420. The baffle 840 includes a first light transmission hole 841, a mounting groove 842, the structure of the first light transmission hole 841, the mounting groove 842 being clearly visible in fig. 57; the first light holes 841 and the mounting grooves 842 are concentrically arranged, and in some embodiments of the present application, the first light holes 841 are through holes by sinking downwards along the upper surface of the baffle 840 to penetrate through the baffle 840; recessed up to half the height of the baffle 840 along the lower surface of the baffle 840 to provide a mounting groove 842; the aperture of the first light-transmitting hole 841 is relatively smaller than that of the mounting groove 842, and the mounting groove 842 is extended more than the first light-transmitting hole 841, so that the mounting groove 842 has an upper surface, a portion of which is located at one end of the first light-transmitting hole 841 and another portion of which is located at the other end of the first light-transmitting hole 841, and thus both ends of the first filter 850 can be respectively located at the upper surface of the mounting groove 842; the first filter 850 and the baffle 840 are connected to each other to form a state in which: the first filter 850 can be seen through the first light holes 841, light can reach the surface of the first filter 850 through the first light holes 841, and meanwhile, the first filter 850 can be embedded into the mounting groove 842, so that the first filter 850 is carried by the baffle 840; therefore, in the embodiment of the present application, the baffle 840 can not only block or intercept the crosstalk light and stray light from entering the first light receiving device 600, but also carry the first filter 850; as described above, the OTDR reflected light sequentially passes through the optical fiber adapter 900, the second lens 890 and the second filter 860 to reach the light-splitting sheet 820, where the OTDR reflected light changes the transmission direction under the reflection of the light-splitting sheet 820, and is emitted into the first filter 850 through the first light-transmitting hole 841 on the baffle 840, and then enters the first light-receiving device 600; for this purpose, the baffle 840 and the first filter 850 are disposed on the reflection path of the OTDR reflected light by the dichroic sheet 820; most of the light (crosstalk light as described above) reflected by the light-splitting sheet 820 is absorbed by the light-absorbing sheet 830, and a part of the crosstalk light is diffusely reflected in the circular square tube 400, so that the baffle 840 is arranged to prevent the part of the crosstalk light from entering the first light-receiving device 600; meanwhile, the baffle 840 is provided with a mounting groove 842 to mount the first filter 850; as shown in fig. 55, the second nozzle 420 of the circular square tube 400 includes a curved surface 421, a first mounting surface 422, and a second mounting surface 423; the shape of the baffle 840 is adapted to the shape of the curved surface 421, the baffle 840 is embedded in the circumference of the curved surface 421, in order to further increase the stability of the baffle 840, two opposite ends of the upper surface of the baffle 840 are respectively adhered to the first mounting surface 422 and the second mounting surface 423, glue is coated on two opposite ends of the upper surface of the baffle 840, and then the two opposite ends of the upper surface of the baffle 840 are respectively adhered to the first mounting surface 422 and the second mounting surface 423, so that the stability of the arrangement of the baffle 840 is increased. The baffle 840 is embedded in the second pipe orifice 420 with the first filter 850, and the OTDR reflected light is injected into the first filter 850 through the first light hole 841, and then enters the first light receiving device 600, so as to realize OTDR monitoring.

The second wavelength spectroscopic system includes a second filter 860, a reflection sheet 870, and a third filter 880.

Fig. 60 to 63 show the assembly relationship of the second filter 860 and the circular square pipe body 400; the circular square tube 400 has a second filter accommodating chamber 404, and the second filter accommodating chamber 404 is used for setting a second filter 860; the second filter accommodating cavity 404 includes a second inclined surface 4041, a third inclined surface 4042 is disposed at the bottom end of the second inclined surface 4041, one surface of the second filter 860 is connected with the second inclined surface 4041, and the other surface is connected with the third inclined surface 4042, so that the second filter 860 is disposed in the second filter accommodating cavity 404, and fig. 63 shows a side view of the second filter 860 disposed in the second filter accommodating cavity 404; a second groove 4044 is arranged between the second inclined surface 4041 and the third inclined surface 4042, if the second inclined surface 4041 is directly connected with the third inclined surface 4042, a metal burr phenomenon can occur during processing, and the attaching precision of the second filter 860 is reduced, so that the existence of the second groove 4044 can avoid the influence of the metal burr between the second inclined surface 4041 and the third inclined surface 4042 on the attaching precision of the second filter 860, and the existence of the second groove 4044 can ensure the attaching precision of the second filter 860; the second inclined surface 4041 is a U-shaped inclined surface, and a fourth light-transmitting hole 4043 is hollow, and the fourth light-transmitting hole 4043 is used for transmitting the OTDR emission light when reaching the second filter 860, continuing to transmit along the optical path of the OTDR emission light, and is also used for transmitting the OSC data light when reaching the second filter 860, continuing to transmit along the optical path of the OSC data light. Further, in the embodiment of the present application, the transmission direction of OSC data light is adjusted from being horizontally transmitted along the optical axis direction of the optical fiber adapter 900 to being transmitted along the direction perpendicular to the third filter 880 under the combination of the 11 ° second filter 860 and the 34 ° reflective sheet 870; in order to adapt to the optical path of the second filter 860, in the embodiment of the present application, the second inclined surface 4041 has a preset inclination angle with respect to the horizontal axis of the circular square tube 400, so as to implement the inclination setting of the second filter 860, and further, in combination with the 34 ° reflecting sheet 870, the transmission direction of OSC data light is horizontally transmitted along the optical axis direction of the optical fiber adapter 900, and is adjusted to be transmitted along the direction perpendicular to the third filter 880.

Fig. 64 to 65 show the fitting relationship of the reflection sheet 870 to the round square tube body 400; the circular square tube 400 has a reflective sheet accommodation chamber 405, and the reflective sheet accommodation chamber 405 is used for disposing a reflective sheet 870; the reflective sheet accommodating cavity 405 includes a fourth inclined surface 4051, the fourth inclined surface 4051 is in a U shape, a fourth cavity 4053 is hollow, the reflective sheet 870 has smaller transmittance, and the fourth cavity 4053 can provide a diffuse reflection space for the transmitted light so as to prevent the transmitted light from being emitted out through the reflective sheet 870; the reflective-sheet accommodation chamber 405 further includes a fifth inclined surface 4052, and the reflective sheet 870 has one surface connected to the fourth inclined surface 4051 and the other surface connected to the fifth inclined surface 4052 to provide the reflective sheet 870 in the reflective-sheet accommodation chamber 405; the third groove 4054 is arranged between the fourth inclined surface 4051 and the fifth inclined surface 4052, if the fourth inclined surface 4051 and the fifth inclined surface 4052 are directly connected, a metal burr phenomenon occurs during processing, and the mounting accuracy of the reflective sheet 870 is reduced, so that the presence of the third groove 4054 can avoid the influence of the metal burr between the fourth inclined surface 4051 and the fifth inclined surface 4052 on the mounting accuracy of the reflective sheet 870, and the presence of the third groove 4054 can ensure the mounting accuracy of the reflective sheet 870; further, in the embodiment of the present application, the transmission direction of OSC data light is adjusted from being horizontally transmitted along the optical axis direction of the optical fiber adapter 900 to being transmitted along the direction perpendicular to the third filter 880 under the combination of the 11 ° second filter 860 and the 34 ° reflective sheet 870; in order to adapt to the optical path of the reflective sheet 870, in the embodiment of the present application, the fourth inclined surface 4051 has a preset inclination angle with respect to the horizontal axis of the circular square tube 400, so as to implement the inclined arrangement of the reflective sheet 870, and further, in combination with the 11 ° second filter 860, the transmission direction of OSC data light is horizontally transmitted along the optical axis direction of the optical fiber adapter 900, and is adjusted to be transmitted along the direction perpendicular to the third filter 880. In order to adapt to the optical path of the reflective sheet 870, in the embodiment of the present application, the fourth inclined surface 4051 has a preset inclination angle with respect to the horizontal axis of the circular square tube 400, so as to implement the inclined arrangement of the reflective sheet 870, and further, in combination with the 11 ° second filter 860, the transmission direction of OSC data light is horizontally transmitted along the optical axis direction of the optical fiber adapter 900, and is adjusted to be transmitted along the direction perpendicular to the third filter 880.

Further, the reflective sheet accommodating cavity 405 further includes a connection surface 4055, where the connection surface 4055 is connected to the fifth inclined surface 4052, and the connection surface 4055, the fifth inclined surface 4052, and the third groove 4054 are sequentially connected to form a U-shaped structure, i.e. a hollow design; the existence of the connection surface 4055 may provide a certain support and transition for the mounting angle of the reflective sheet 870, and thus may increase the mounting accuracy of the reflective sheet 870.

Fig. 66 to 67 show the fitting relationship of the third filter 880 and the round and square tube 400; the circular square tube 400 is provided with a third tube orifice 430, a third filter receiving cavity 409 is arranged on the end face of the third tube orifice 430, and the third filter receiving cavity 409 is used for arranging a third filter 880; the third filter housing cavity 409 includes a first stage 4091 and a second stage 4092; the first platform 4091 and the second platform 4092 are disposed opposite; the third filter 880 is connected across the first platform 4091 and the second platform 4092, one end of the third filter 880 is connected with the first platform 4091, and the other end is connected with the second platform 4092; the third filter 880 is provided in the third filter housing cavity 409 as shown in fig. 67. The second light receiving device 700 is embedded in the third nozzle 430, and the third filter 880 allows OSC data light to enter the second light receiving device 700, and does not allow wavelengths other than the second wavelength to enter the second light receiving device 700, thereby realizing OSC data transmission.

The foregoing is merely a specific embodiment of the disclosure, but the protection scope of the disclosure is not limited thereto, and any person skilled in the art who is skilled in the art will recognize that changes or substitutions are within the technical scope of the disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. An optical module, comprising:

a circuit board;

The mounting surface is U-shaped, a third cavity is arranged in the middle of the mounting surface and used for providing diffuse reflection space for the second light splitting of the OTDR emitted light, and first grooves are respectively arranged at two ends of the mounting surface and used for collecting glue overflowed when the light absorption sheet is attached;

2. The optical module of claim 1, wherein the light emitting device has a laser chip and a first lens disposed therein;

the first lens is set as a collimating lens and is used for converting OTDR emission light generated by the laser chip from divergent light into parallel light;

the optical isolator is arranged in the first pipe orifice and used for preventing reflected light of the OTDR emitted light and transmitted light of the OTDR reflected light after passing through the light splitting sheet from returning to the light emitting device;

the optical splitting sheet is arranged on the transmission optical path of the OTDR emission light and is used for transmitting and reflecting the OTDR emission light to respectively obtain an OTDR emission light first split light and an OTDR emission light second split light, and is also used for transmitting and reflecting the OTDR reflection light to respectively obtain an OTDR reflection light first split light and an OTDR reflection light second split light;

the first filter is arranged on a reflected light transmission optical path of the OTDR reflected light after passing through the optical splitter and is used for enabling the OTDR reflected light to pass through the second optical splitter so as to enter the first light receiving device;

the second filter is arranged on a transmission optical path of the first optical spectrum of the OTDR emission light, and is used for transmitting the first optical spectrum of the OTDR emission light and the reflected light of the OTDR, and reflecting the OSC data light;

the reflection sheet is arranged on a reflected light transmission optical path of the OSC data light after passing through the second filter and is used for receiving the OSC data light reflected by the second filter and reflecting the OSC data light;

a third filter, disposed on a reflected light transmission path of the OSC data light passing through the reflector, for receiving the OSC data light reflected by the reflector and transmitting the OSC data light into the second light receiving device;

the second lens is set as a converging lens and is arranged at the fifth pipe orifice and is used for converting the OTDR emission light from parallel light into converging light and transmitting the converging OTDR emission light into the optical fiber adapter; and the optical disk is also used for converting the OTDR reflected light and the OSC data light from divergent light into parallel light so as to enter the circular square tube.

3. The optical module of claim 1, wherein the first filter is configured to transmit the second optical spectrum of the OTDR reflected light into the first optical receiving device;

the first filter plate is connected with the baffle plate;

the baffle is arranged in the second pipe orifice, and the edge of the baffle is connected with the second pipe orifice in a sealing way through black glue so as to prevent the second light splitting of the OTDR emitted light from entering the first light receiving device; and an absorption layer is arranged on the surface of the optical fiber to absorb the second split light of the OTDR emitted light which is not absorbed by the light absorption sheet.

4. A light module as recited in claim 3, wherein the baffle comprises a first light aperture and the mounting slot;

the mounting groove is formed by upwards sinking the lower surface of the baffle plate and extending towards the periphery of the baffle plate so as to arrange the first filter plate;

the first light holes are formed by downwards sinking the upper surface of the baffle plate, and the extension diameter of the baffle plate towards the outer periphery is smaller than the extension diameter of the mounting groove towards the outer periphery of the baffle plate, so that the first filter plates are exposed, and the first filter plates are used for enabling the OTDR emitted light to pass through the second light splitting plates so as to be injected into the first filter plates.

5. The optical module according to claim 1, wherein the inner cavity of the circular square tube is provided with a light splitting sheet accommodating cavity, a second filter sheet accommodating cavity, a reflecting sheet accommodating cavity and a third filter sheet accommodating cavity, respectively, for setting the light splitting sheet, the second filter sheet, the reflecting sheet and the third filter sheet;

a first inclined surface is arranged in the round square tube body, the first inclined surface is provided with a first surface and a second surface, the first surface faces the light emitting device, and the second surface faces the optical fiber adapter;

the light splitting sheet accommodating cavity is formed by the second surface sinking to penetrate through the first surface and comprises a supporting surface, a supporting surface and a pasting surface;

the supporting surface and the supporting surface form a first right-angle clamping groove, the supporting surface and the attaching surface form a second right-angle clamping groove, and the first right-angle clamping groove and the second right-angle clamping groove are used for embedding the light splitting sheet;

the light splitting sheet accommodating cavity is provided with a second light hole on one side wall and a third light hole on the other side wall, and the second light hole and the third light hole are communicated with the light splitting sheet accommodating cavity;

the second light hole is used for enabling the OTDR emitted light to penetrate and transmit to the surface of the light splitting sheet;

The third light hole is used for enabling the OTDR emitted light to transmit through the second light splitting and transmit to the surface of the light absorption sheet.

6. The optical module of claim 5, wherein the second filter receiving cavity comprises:

the second inclined surface is U-shaped, has a preset inclined angle relative to the horizontal axis of the round square tube body and is connected with one surface of the second filter plate;

the third inclined surface is provided with a preset inclined angle relative to the horizontal axis of the round square tube body and is connected with the other surface of the second filter plate;

the second groove is arranged between the second inclined surface and the third inclined surface and is not contacted with the second filter;

the fourth light hole is arranged in the middle of the second inclined plane and is used for enabling the OTDR emission light to pass through when reaching the second filter plate; and also for passing OSC data light when reaching the second filter.

7. The light module of claim 5 wherein the reflector sheet receiving cavity comprises:

the fourth inclined surface is U-shaped, has a preset inclined angle relative to the horizontal axis of the round square tube body and is connected with one surface of the reflecting sheet;

The fifth inclined surface is provided with a preset inclined angle relative to the horizontal axis of the round square tube body and is connected with the other surface of the reflecting sheet;

the third groove is arranged between the fourth inclined surface and the fifth inclined surface and is not contacted with the reflecting sheet;

the fourth cavity is arranged in the middle of the fourth inclined surface and is used for providing a diffuse reflection space for light transmitted through the reflecting sheet;

the connecting surface is connected with the fifth inclined surface, and the connecting surface, the fifth inclined surface and the third groove are sequentially connected to form a U-shaped structure.

8. The optical module of claim 5, wherein the third filter receiving cavity comprises oppositely disposed first and second lands;

the third filter is connected between the first platform and the second platform in a bridging mode, one end of the third filter is connected with the first platform, and the other end of the third filter is connected with the second platform.

9. The optical module according to claim 1, wherein the circular square tube body inner cavity is further provided with a first cavity and an optical isolator accommodating cavity;

the first cavity and the optical isolator accommodating cavity are adjacently arranged and are all arranged in the first pipe orifice;

the degree of the first cavity sinking towards the outer periphery of the round square tube is larger than that of the optical isolator accommodating cavity sinking towards the outer periphery of the round square tube;

The first cavity is used for separating the light emitting device from the optical isolator so as to avoid each other;

the optical isolator accommodation cavity is used for setting the optical isolator.

10. The optical module according to claim 1, wherein a second lens accommodating cavity and a second cavity are further arranged in the round square tube body;

the degree of the second cavity sinking towards the outer periphery of the round square tube is larger than the degree of the second cavity sinking towards the outer periphery of the round square tube;

the optical fiber adapter comprises an optical fiber ferrule;

the second cavity is used for providing a moving space for the optical fiber ferrule when the optical fiber adapter is coupled;

the second lens accommodation chamber is used for setting the second lens.