CN220526049U

CN220526049U - Optical module

Info

Publication number: CN220526049U
Application number: CN202321923111.0U
Authority: CN
Inventors: 晋路; 孙飞龙
Original assignee: Hisense Broadband Multimedia Technology Co Ltd
Current assignee: Hisense Broadband Multimedia Technology Co Ltd
Priority date: 2023-07-20
Filing date: 2023-07-20
Publication date: 2024-02-23
Anticipated expiration: 2033-07-20

Abstract

The disclosure provides an optical module, which comprises an optical transceiver component and an optical fiber adapter, wherein the optical transceiver component comprises a round square tube body, an optical filter, an optical reflection assembly, an optical absorption assembly and an optical transmission and reception assembly inserted into the round square tube body, OTDR emission light emitted by the optical transmission assembly is emitted into an optical fiber insert core of the optical fiber adapter through the optical filter, the OTDR emission light is reflected in the optical fiber to generate first OTDR reflection light, and the first OTDR reflection light is emitted into the optical reception assembly through the optical filter; the optical reflection assembly is positioned on a reflection light path of the OTDR emitted light on the optical fiber end face of the optical fiber ferrule, the optical reflection assembly is positioned between the optical filter and the optical fiber end face, and is used for reflecting and converging second OTDR reflected light reflected by the optical fiber end face into a fourth pipe orifice of the round square pipe body, and the second OTDR reflected light is absorbed by the light absorption assembly in the fourth pipe orifice. The optical fiber end face reflection light is eliminated through the light reflection assembly and the light absorption assembly, and signal crosstalk is reduced.

Description

Optical module

Technical Field

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

Background

In the new business and application modes of cloud computing, mobile internet, video, etc., optical communication technology is used. In optical communication, an optical module is a device for realizing photoelectric signal conversion, and is one of key devices in optical communication equipment.

With the wide popularization of the optical fiber broadband network, the requirement for the intelligent network monitoring function is higher and higher, so that most optical modules are internally provided with optical time domain reflectometers (Optical Time Domain Reflectometer, OTDR), a laser light source is utilized to send optical signals to the tested optical fiber, the optical signals are reflected on the optical fiber and each characteristic point, the reflected optical signals are coupled into an OTDR receiving assembly, the OTDR receiving assembly converts the reflected optical signals into electric signals, and the performance of the optical fiber is monitored through the electric signals, so that the events such as the fusion point, the connector or the breakage of the optical fiber are judged.

In the optical module, a Bi-Directional Optical Sub-Assembly (BOSA) is usually provided to realize the OTDR function. However, the optical signal emitted by the laser light source easily generates crosstalk to the OTDR detection optical signal, so that the reflected optical signal with information is submerged in background noise, and the reflected optical signal cannot be accurately detected, which affects the OTDR performance of the optical module.

Disclosure of Invention

The embodiment of the disclosure provides an optical module, which is used for reducing signal crosstalk of an emitted optical signal to an OTDR detection optical signal and improving the OTDR performance of the optical module.

The present disclosure provides an optical module, comprising:

a circuit board;

the optical transceiver component is electrically connected with the circuit board and is used for transmitting and receiving optical signals;

the optical fiber adapter is in optical connection with the optical transceiver component and comprises an optical fiber inserting core, the optical fiber inserting core is obliquely arranged, and a first preset angle is formed between the central axis of the optical fiber inserting core and the light emitting direction of the optical transceiver component; the optical fiber end face of the optical fiber insert core is obliquely arranged, a second preset angle is arranged between the optical fiber end face and the vertical plane, and the second preset angle is larger than the first preset angle;

wherein the optical transceiver comprises:

the optical fiber ferrule is characterized in that a round square tube body is provided with a first tube orifice, a second tube orifice, a third tube orifice and a fourth tube orifice on the side wall, the first tube orifice and the third tube orifice are arranged oppositely, the second tube orifice and the fourth tube orifice are positioned between the first tube orifice and the third tube orifice, and the optical fiber ferrule is inserted into the third tube orifice;

the light emission component is connected with the first pipe orifice and is used for emitting OTDR emitted light to the round square pipe body;

The optical filter is arranged in the inner cavity of the round square tube body, the OTDR emission light penetrates through the optical filter and is emitted into the optical fiber insert core, and part of the OTDR emission light is reflected at the optical fiber end face of the optical fiber insert core to generate second OTDR reflected light; the OTDR emission light is reflected in the optical fiber to generate first OTDR reflection light, the wavelength of the first OTDR reflection light is the same as that of the OTDR emission light, the first OTDR reflection light returns to the circular square tube body, and the first OTDR reflection light is reflected at the optical filter;

the optical receiving assembly is connected with the second pipe orifice and is used for receiving the first OTDR reflected light reflected by the optical filter, and the first OTDR reflected light is used for detecting OTDR;

the optical reflection assembly is arranged in the inner cavity of the round square tube body, is positioned on a reflection light path of the OTDR emitted light on the end face of the optical fiber, is positioned between the optical filter and the end face of the optical fiber, and is used for reflecting and converging the second OTDR reflected light into the fourth tube orifice;

and the light absorption assembly is embedded in the fourth pipe orifice and is used for absorbing the second OTDR reflected light in the fourth pipe orifice.

As can be seen from the foregoing embodiments, the optical module provided in the embodiments of the present disclosure includes a circuit board, an optical transceiver component and an optical fiber adapter, where the optical transceiver component is electrically connected to the circuit board, the optical transceiver component is optically connected to the optical fiber adapter, an optical signal emitted by the optical transceiver component is transmitted to an external optical fiber through the optical fiber adapter, and an optical signal transmitted by the external optical fiber is transmitted to the optical transceiver component through the optical fiber adapter, so as to implement light emission and light reception; the optical fiber adapter comprises an optical fiber inserting core, wherein a first preset angle is formed between the central axis of the optical fiber inserting core and the light emitting direction of the light receiving and transmitting component, so that an angle is formed between emitted light entering the optical fiber inserting core and reflected light of an optical fiber link output by the optical fiber inserting core, and crosstalk caused by the emitted light on the reflected light is avoided; a second preset angle is formed between the optical fiber end face of the optical fiber insert core and the vertical plane, so that a certain angle is formed between light emitted by the optical transceiver component and light reflected by the emitted light at the optical fiber end face, and crosstalk caused by reflected light of the optical fiber end face on the emitted light is avoided; the optical transceiver component comprises a round square tube body, an optical emission component, an optical filter, an optical receiving component, an optical reflection component and an optical absorption component, wherein a first tube orifice, a second tube orifice, a third tube orifice and a fourth tube orifice are respectively formed on the side wall of the round square tube body, the first tube orifice and the third tube orifice are oppositely arranged, the optical emission component is connected with the first tube orifice, and the optical fiber insert core is inserted into the third tube orifice; the second pipe orifice and the fourth pipe orifice are positioned between the first pipe orifice and the third pipe orifice, the light receiving component is connected with the second pipe orifice, and the light absorbing component is embedded in the fourth pipe orifice; the optical filter is arranged in the inner cavity of the round square tube body, OTDR emission light emitted by the optical emission component is emitted into the optical fiber insert core through the optical filter, the OTDR emission light is reflected in the optical fiber to generate first OTDR reflection light, the wavelength of the first OTDR reflection light is identical to that of the OTDR emission light, the first OTDR reflection light is reflected back into the round square tube body, the first OTDR reflection light is reflected to the optical receiving component through the optical filter, and the optical receiving component receives the first OTDR reflection light so as to detect the OTDR performance of the optical fiber through the first OTDR reflection light; the optical reflection assembly is arranged in the inner cavity of the round square tube body, the optical reflection assembly is positioned on a reflection light path of the OTDR emitted light on the optical fiber end face of the optical fiber ferrule, the optical reflection assembly is positioned between the optical filter and the optical fiber end face, the optical reflection assembly reflects and gathers the second OTDR reflected light reflected by the optical fiber end face into the fourth tube mouth, the second OTDR reflected light in the fourth tube mouth can be absorbed by the light absorption assembly, and the second OTDR reflected light reflected by the optical fiber end face can be eliminated, so that signal crosstalk caused by the second OTDR reflected light to the first OTDR reflected light can be avoided.

According to the optical fiber module, the optical reflection assembly is additionally arranged on the reflection light path of the optical fiber end face of the optical fiber ferrule, the optical reflection assembly reflects and gathers the reflected light of the optical fiber end face into the cavity below the round square tube body, the reflected light of the optical fiber end face can be prevented from entering the optical receiving assembly, so that the signal crosstalk of the reflected light of the optical fiber end face to the OTDR reflected light of the optical fiber link can be reduced, and the OTDR performance of the optical module is guaranteed.

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 partial block diagram of an optical communication system provided in accordance with some embodiments of the present disclosure;

fig. 2 is a partial block diagram of a host computer according to some embodiments of the present disclosure;

FIG. 3 is a block diagram of an optical module provided in accordance with some embodiments of the present disclosure;

FIG. 4 is an exploded view of an optical module provided in accordance with some embodiments of the present disclosure;

fig. 5 is a block diagram of an optical transceiver in an optical module according to some embodiments of the present disclosure;

fig. 6 is an exploded view of an optical transceiver component in an optical module provided in accordance with some embodiments of the present disclosure;

fig. 7 is a first block diagram of a circular square tube body in an optical module according to some embodiments of the present disclosure;

fig. 8 is a second block diagram of a circular square tube body in an optical module according to some embodiments of the present disclosure;

fig. 9 is a partial block diagram of an optical transceiver in an optical module according to some embodiments of the present disclosure;

fig. 10 is a cross-sectional view of a circular square tube body in an optical module according to some embodiments of the present disclosure;

fig. 11 is a second cross-sectional view of a circular square tube body in an optical module according to some embodiments of the present disclosure;

fig. 12 is a block diagram of a light absorbing sheet holder in an optical module according to some embodiments of the present disclosure;

FIG. 13 is a cross-sectional view of a fiber optic adapter in an optical module provided in accordance with some embodiments of the present disclosure;

fig. 14 is a cross-sectional view of an optical transceiver component in an optical module provided according to some embodiments of the present disclosure;

Fig. 15 is a first block diagram of a light reflecting component in a light module according to some embodiments of the present disclosure;

fig. 16 is an exploded view of a light reflecting assembly in a light module provided in accordance with some embodiments of the present disclosure;

FIG. 17 is a block diagram of a lens holder in an optical module provided in accordance with some embodiments of the present disclosure;

FIG. 18 is a side view of a lens holder in an optical module provided in accordance with some embodiments of the present disclosure;

FIG. 19 is a block diagram of a converging lens in an optical module provided in accordance with some embodiments of the present disclosure;

fig. 20 is a partial cross-sectional view of an optical transceiver component in an optical module provided in accordance with some embodiments of the present disclosure;

fig. 21 is a second block diagram of a light reflecting component in a light module according to some embodiments of the present disclosure;

fig. 22 is a side view of a light reflecting assembly in a light module provided in accordance with some embodiments of the present disclosure;

fig. 23 is a partial cross-sectional view two of an optical transceiver component in an optical module according to some embodiments of the present disclosure.

Detailed Description

Technical solutions in some embodiments of the present disclosure will be clearly and specifically described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present disclosure, but not all embodiments. All other embodiments obtained by one of ordinary skill in the art based on the embodiments provided by the present disclosure are within the scope of the present disclosure.

In the optical communication technology, in order to establish information transfer between information processing apparatuses, it is necessary to load information onto light, and transfer of information is realized by propagation of light. Here, the light loaded with information is an optical signal. The optical signal can reduce the loss of optical power when transmitted in the information transmission device, so that high-speed, long-distance and low-cost information transmission can be realized. The signal that the information processing apparatus can recognize and process is an electrical signal. Information processing devices typically include optical network terminals (Optical Network Unit, ONUs), gateways, routers, switches, handsets, computers, servers, tablets, televisions, etc., and information transmission devices typically include optical fibers, optical waveguides, etc.

The optical module can realize the mutual conversion of optical signals and electric signals between the information processing equipment and the information transmission equipment. For example, at least one of the optical signal input end or the optical signal output end of the optical module is connected with an optical fiber, and at least one of the electrical signal input end or the electrical signal output end of the optical module is connected with an optical network terminal; the optical module converts the first optical signal into a first electrical signal and transmits the first electrical signal to an optical network terminal; the second electrical signal from the optical network terminal is transmitted to the optical module, which converts the second electrical signal into a second optical signal and transmits the second optical signal to the optical fiber. Since information transmission can be performed between the plurality of information processing apparatuses by an electric signal, it is necessary that at least one of the plurality of information processing apparatuses is directly connected to the optical module, and it is unnecessary that all of the information processing apparatuses are directly connected to the optical module. Here, the information processing apparatus directly connected to the optical module is referred to as an upper computer of the optical module. In addition, the optical signal input or the optical signal output of the optical module may be referred to as an optical port, and the electrical signal input or the electrical signal output of the optical module may be referred to as an electrical port.

Fig. 1 is a partial block diagram of an optical communication system provided according to some embodiments of the present disclosure. As shown in fig. 1, the optical communication system mainly includes a remote information processing apparatus 1000, a local information processing apparatus 2000, a host computer 100, an optical module 200, an optical fiber 101, and a network cable 103.

One end of the optical fiber 101 extends in the direction of the remote information processing apparatus 1000, and the other end of the optical fiber 101 is connected to the optical module 200 through an optical port of the optical module 200. The optical signal may be totally reflected in the optical fiber 101, and the propagation of the optical signal in the direction of total reflection may almost maintain the original optical power, and the optical signal may be totally reflected in the optical fiber 101 a plurality of times to transmit the optical signal from the remote information processing apparatus 1000 into the optical module 200, or transmit the optical signal from the optical module 200 to the remote information processing apparatus 1000, thereby realizing remote, low power loss information transfer.

The optical communication system may include one or more optical fibers 101, and the optical fibers 101 are detachably connected, or fixedly connected, with the optical module 200. The upper computer 100 is configured to provide data signals to the optical module 200, or receive data signals from the optical module 200, or monitor or control the operating state of the optical module 200.

The host computer 100 includes a substantially rectangular parallelepiped housing (housing), and an optical module interface 102 provided on the housing. The optical module interface 102 is configured to access the optical module 200, so that the host computer 100 and the optical module 200 establish a unidirectional or bidirectional electrical signal connection.

The upper computer 100 further includes an external electrical interface, which may access an electrical signal network. For example, the pair of external electrical interfaces includes a universal serial bus interface (Universal Serial Bus, USB) or a network cable interface 104, and the network cable interface 104 is configured to access the network cable 103 so as to establish a unidirectional or bidirectional electrical signal connection between the host computer 100 and the network cable 103. One end of the network cable 103 is connected to the local information processing apparatus 2000, and the other end of the network cable 103 is connected to the host computer 100, so that an electrical signal connection is established between the local information processing apparatus 2000 and the host computer 100 through the network cable 103. For example, the third electrical signal sent by the local information processing apparatus 2000 is transmitted to the upper computer 100 through the network cable 103, the upper computer 100 generates a second electrical signal according to the third electrical signal, the second electrical signal from the upper computer 100 is transmitted to the optical module 200, the optical module 200 converts the second electrical signal into a second optical signal, and the second optical signal is transmitted to the optical fiber 101, where the second optical signal is transmitted to the remote information processing apparatus 1000 in the optical fiber 101. For example, a first optical signal from the remote information processing apparatus 1000 propagates through the optical fiber 101, the first optical signal from the optical fiber 101 is transmitted to the optical module 200, the optical module 200 converts the first optical signal into a first electrical signal, the optical module 200 transmits the first electrical signal to the host computer 100, the host computer 100 generates a fourth electrical signal from the first electrical signal, and the fourth electrical signal is transmitted to the local information processing apparatus 2000. The optical module is a tool for realizing the mutual conversion between the optical signal and the electric signal, and the information is not changed in the conversion process of the optical signal and the electric signal, and the coding and decoding modes of the information can be changed.

The host computer 100 includes an optical line terminal (Optical Line Terminal, OLT), an optical network device (Optical Network Terminal, ONT), a data center server, or the like in addition to the optical network terminal.

Fig. 2 is a partial block diagram of a host computer according to some embodiments of the present disclosure. In order to clearly show the connection relationship between the optical module 200 and the host computer 100, fig. 2 only shows the structure of the host computer 100 related to the optical module 200. As shown in fig. 2, the upper computer 100 further includes a PCB circuit board 105 disposed in the housing, a cage 106 disposed on a surface of the PCB circuit board 105, 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 structure such as a fin that increases the heat dissipation area.

The optical module 200 is inserted into the cage 106 of the host computer 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 the electrical connector inside the cage 106, so that the optical module 200 and the host computer 100 are connected by bi-directional electrical signals. Furthermore, 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 provided according to some embodiments of the present disclosure, and fig. 4 is an exploded view of an optical module provided according to some embodiments of the present disclosure. As shown in fig. 3 and 4, the optical module 200 includes a housing (shell), a circuit board 300 disposed in the housing, an optical transceiver 900, and an optical fiber adapter 700, but the disclosure is not limited thereto.

The housing includes an upper housing 201 and a lower housing 202, the upper housing 201 being capped on the lower housing 202 to form the above-described housing having two openings 204 and 205; the outer contour of the housing generally presents a square shape.

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 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 of the connection line of the two openings 204 and 205 may be identical to the length direction of the optical module 200 or not identical to the length 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 301 of the circuit board 300 extends out of the electrical port and is inserted into the electrical connector of the upper computer 100; the opening 205 is an optical port configured to access the external optical fiber 101 such that the optical fiber 101 is connected to the optical transceiver 900 in the optical module 200.

The circuit board 300, the optical transceiver 900, the optical fiber adapter 700 and the like are conveniently mounted in the upper and lower housings 201 and 202 by adopting the combined assembly mode, and the upper and lower housings 201 and 202 can protect the devices in a packaging way. In addition, when the circuit board 300, the optical transceiver component 900, the optical fiber adapter 700, and the like are assembled, the assembly mode of the upper housing 201 and the lower housing 202 is adopted, so that the positioning component, the heat dissipation component and the electromagnetic shielding component of the devices are conveniently deployed, and the automatic production implementation is facilitated.

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

In some embodiments, the light module 200 further includes an unlocking member 600 located outside its housing. The unlocking part 600 is configured to achieve a fixed connection between the optical module 200 and the upper computer 100 or to release the fixed connection between the optical module 200 and the upper computer 100.

For example, the unlocking member 600 is located outside the two lower side plates 2022 of the lower housing 202, and includes an engaging member that mates with the cage 106 of the upper computer 100. When the optical module 200 is inserted into the cage 106, the optical module 200 is fixed in the cage 106 by the engaging part of the unlocking part 600; when the unlocking member 600 is pulled, the engaging member of the unlocking member 600 moves along with the unlocking member, so that the connection relationship between the engaging member and the host computer is changed, and the fixation between the optical module 200 and the host computer is released, so that the optical module 200 can be pulled out from the cage 106.

The circuit board 300 includes circuit traces, electronic components, chips, etc., and the electronic components and the chips are connected according to a circuit design through the circuit traces to realize functions of power supply, electric signal transmission, grounding, etc. The electronic components may include, for example, capacitors, resistors, transistors, metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET). The chips may include, for example, a micro control unit (Microcontroller Unit, MCU), a laser driver chip, a transimpedance amplifier (Transimpedance Amplifier, TIA), a limiting amplifier (limiting amplifier, LA), a clock data recovery chip (Clock and Data Recovery, CDR), 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; the rigid circuit board may also be inserted into an electrical connector in the cage 106 of the host computer 100.

The circuit board 300 further includes a gold finger 301 formed on an end surface thereof, the gold finger 301 being composed of a plurality of pins independent of each other. The circuit board 300 is inserted into the cage 106 and is electrically connected to the electrical connector within the cage 106 by the gold finger 301. The golden finger 301 may be disposed on a surface of only one side of the circuit board 300 (for example, an upper surface shown in fig. 4), or may be disposed on surfaces of both sides of the circuit board 300, so as to provide a greater number of pins, thereby adapting to occasions with a large number of pins. The golden finger 301 is configured to establish electrical connection with an upper computer to achieve power supply, grounding, two-wire synchronous serial (Inter-Integrated Circuit, 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.

In some embodiments, the optical transceiver component 900 is physically separated from the circuit board 300 and then electrically connected to the circuit board 300 through a flexible circuit board or electrical connection.

In some embodiments, the optical transceiver component 900 may be disposed directly on the circuit board 300. For example, the optical transceiver 900 may be disposed on a surface of the circuit board 300 or on a side of the circuit board 300.

The optical transceiver 900 includes an optical transmitting assembly configured to enable transmission of an optical signal and an optical receiving assembly configured to enable reception of an optical signal. Illustratively, the light emitting assembly and the light receiving assembly are combined together to form an integral light transceiving component.

There are many packaging manners of the optical transceiver 900, for example, the optical transmitting component and the optical receiving component are packaged by TO, and the optical transmitting component and the optical receiving component may be electrically connected through a flexible circuit board and the circuit board 300, that is, one end of the flexible circuit board is electrically connected TO the optical transmitting component or the optical receiving component, and the other end of the flexible circuit board is electrically connected TO the circuit board 300.

The optical module may have a plurality of functions, such as an optical time domain reflectometry (Optical Time Domain Reflectometer, OTDR) function, where the optical transceiver 900 is connected to the optical fiber adapter 700, the optical fiber adapter 700 is connected to the external optical fiber 101, and the optical transmitter assembly of the optical transceiver 900 transmits an optical signal into the external optical fiber 101, and when the optical signal is transmitted in the external optical fiber 101, due to the nature of the optical fiber itself, the optical link abnormality such as a connector, an interruption or a bending, etc., the optical signal generates scattering and reflection in the external optical fiber 101, and a part of the scattered light and the reflected light signal returns to the optical receiver assembly, and the optical receiver assembly determines whether the optical link abnormality occurs according to the time domain characteristics of the received scattered light signal and the reflected light signal.

Fig. 5 is a block diagram of an optical transceiver in an optical module according to some embodiments of the present disclosure, and fig. 6 is an exploded view of an optical transceiver in an optical module according to some embodiments of the present disclosure. As shown in fig. 5 and 6, the optical transceiver 900 includes a round square tube 910, an optical transmitter 400 and an optical receiver 500, the optical transmitter 400, the optical receiver 500 and the optical adapter 700 being insertable into the round square tube 910, the optical transmitter 400 being electrically connected to the circuit board 300, the optical transmitter 400 and the optical adapter 700 being inserted into opposite side walls of the round square tube 910, such that the optical transmitter 400 generates an OTDR-transmitted optical signal, the OTDR-transmitted optical signal being injected into the optical adapter 700 via the round square tube 910, the OTDR-transmitted optical signal being transmitted into the external optical fiber 101 via the optical adapter 700, and when the external optical fiber 101 is abnormal due to its own properties, a connector, a terminal or a bend, etc., the OTDR-transmitted optical signal being scattered and reflected in the external optical fiber 101 to generate a first OTDR-reflected light, the first OTDR-reflected optical signal being transmitted into the round square tube 910 via the optical fiber adapter 700.

The optical receiving assembly 500 is located between the optical transmitting assembly 400 and the optical fiber adapter 700, the optical receiving assembly 500 is electrically connected with the circuit board 300, the round square tube body 910 receives the first OTDR reflected light from the optical fiber adapter 700, the round square tube body 910 transmits the first OTDR reflected light to the optical receiving assembly 500, the optical receiving assembly 500 converts the first OTDR reflected light into an electrical signal, the electrical signal is transmitted to the circuit board 300, and corresponding devices on the circuit board 300 detect whether an optical link is abnormal according to the electrical signal.

Fig. 7 is a first structural diagram of a circular square tube body in an optical module according to some embodiments of the present disclosure, and fig. 8 is a second structural diagram of a circular square tube body in an optical module according to some embodiments of the present disclosure. As shown in fig. 7 and 8, the round square tube body 910 may be a square body, the first side wall (left side wall) of the round square tube body 910 is fixedly provided with the first adjusting sleeve 410, the first adjusting sleeve 410 is located outside the round square tube body 910, a through hole 901 is formed in the first adjusting sleeve 410, a first tube opening is formed on the first side wall of the round square tube body 910, and the through hole 901 is communicated with the first tube opening, so that the first adjusting sleeve 410 is communicated with the round square tube body 910 through the through hole 901 and the first tube opening.

The light emitting assembly 400 is inserted into the through hole 901, that is, the light emitting assembly 400 is connected with the round square tube body 910 through the first adjusting sleeve 410, and the OTDR emitted light generated by the light emitting assembly 400 is transmitted into the inner cavity of the round square tube body 910 through the through hole 901 and the first tube orifice.

In some embodiments, the end surface of the first adjustment sleeve 410 is welded to the first side wall of the circular square tube 910 to implement a mechanical patch and mechanical connection; the end surface area of the first adjusting sleeve 410 is larger than that of the light emitting assembly 400, so that the first adjusting sleeve 410 can facilitate welding the light emitting assembly 400 and the round square tube 910, and can increase the welding area between the light emitting assembly 400 and the round square tube 910, and increase welding firmness.

In some embodiments, the light emitted by the light emitting component 400 is parallel light, the light emitting component 400 is inserted into the through hole 901 of the first adjusting sleeve 410, then XY plane coupling is performed on the light emitting component 400, and when the coupling is performed to the maximum light emitting power, the first adjusting sleeve 410 is welded to the end face of the circular square tube 910, so as to achieve mechanical leveling and mechanical connection. The XY plane refers to the axis (X direction) of the line connecting the light emitting module 400 to the optical fiber adapter 700 in fig. 9, the Y direction perpendicular to the axis, and the plane formed by the X direction and the Y direction is the XY plane.

In some embodiments, the first adjustment sleeve 410 and the circular square tube 910 may be integrally formed, and the light emitting assembly 400 is inserted into the through hole 901 of the first adjustment sleeve 410 to achieve optical coupling between the light emitting assembly 400 and the circular square tube 910.

A second pipe orifice 902 is formed on a second side wall (top surface) of the round square pipe body 910, the second pipe orifice 902 is communicated with an inner cavity of the round square pipe body 910, and the light receiving assembly 500 is inserted into the second pipe orifice 902, so that the light receiving assembly 500 is connected with the round square pipe body 910.

A third pipe orifice 903 is formed on a third side wall (right side wall) of the round square pipe body 910, the third pipe orifice 903 is communicated with an inner cavity of the round square pipe body 910, the third pipe orifice 903 is opposite to the through hole 901, the second pipe orifice 902 is located between the through hole 901 and the third pipe orifice 903, and one end of the optical fiber adapter 700 is inserted into the third pipe orifice 903, so that the optical fiber adapter 700 is connected with the round square pipe body 910.

Referring to fig. 6, in some embodiments, the fiber optic adapter 700 is coupled to the round square tube 910 by a second adjustment sleeve that is configured to better couple the fiber optic adapter 700 to the round square tube 910 on the one hand and to facilitate optical coupling of the fiber optic adapter 700 on the other hand. The fiber optic adapter 700 is inserted into the second adjustment sleeve, and then the end face of the second adjustment sleeve is welded to the side wall of the third nozzle 903, thereby achieving mechanical leveling and mechanical connection.

In some embodiments, the light emitted from the optical fiber adapter 700 is concentrated light, and the light entering the optical fiber adapter 700 is also concentrated light, so when the optical fiber adapter 700 is coupled, the optical fiber adapter 700 is coupled in XYZ directions based on the square tube 910, and is coupled to the maximum light emission power. The optical fiber adapter 700 is embedded into the second adjusting sleeve, the second adjusting sleeve is coupled along with the optical fiber adapter 700 in an XY plane, meanwhile, the optical fiber adapter 700 is also coupled in a Z axis, and when the coupling is coupled to the maximum light emitting power, the side face of the second adjusting sleeve is welded with the side wall where the third pipe orifice 903 is located.

Fig. 9 is a partial block diagram of an optical transceiver in an optical module according to some embodiments of the present disclosure. As shown in fig. 9, an optical component is disposed in the inner cavity of the square tube 910, the optical component includes an optical filter 930, the optical filter 930 is located at an intersection point of an emission light path of the optical emission component 400 and a receiving light path of the optical receiving component 500, after OTDR emission light generated by the optical emission component 400 is injected into the square tube 910, the OTDR emission light directly penetrates the optical filter 930 and is injected into the optical fiber adapter 700, and the OTDR emission light is coupled to the external optical fiber 101 through the optical fiber adapter 700, so as to implement emission of the OTDR emission light.

In some embodiments, the optical filter 930 is disposed obliquely so as to transmit the OTDR emitted by the optical transmitter assembly 400 and reflect the first OTDR reflected light transmitted by the optical fiber adapter 700, and the distance between the optical filter 930 and the upper housing 201 gradually increases along the light transmitting direction of the optical transmitter assembly 400.

In some embodiments, the filter 930 is disposed at 45 ° to the light emission direction of the light emitting assembly 400.

When there is an abnormality such as a break point in the external optical fiber 101, the OTDR emitted light is scattered and reflected in the external optical fiber 101 to generate first OTDR reflected light, the first OTDR reflected light returns to the round square tube 910 through the optical fiber adapter 700, the first OTDR reflected light is reflected again at the optical filter 930, and the reflected first OTDR reflected light is injected into the optical receiving assembly 500, so that the optical receiving assembly 500 detects the abnormality of the external optical fiber 101 according to the received first OTDR reflected light.

In some embodiments, the optical assembly further includes a converging lens, the converging lens is mounted in the circular square tube 910, and the converging lens is located between the optical filter 930 and the optical fiber adapter 700, and the OTDR emitted light passing through the optical filter 930 is converged to the optical fiber ferrule of the optical fiber adapter 700 by the converging lens, so as to transmit the OTDR emitted light into an external optical fiber; the first OTDR reflected light reflected by the external optical fiber is incident on the round square tube 910 through the optical fiber adapter 700, and is converted into collimated light through the converging lens, and the collimated light is reflected to the light receiving assembly 500 through the optical filter 930.

In some embodiments, when the OTDR emission light is coupled to the optical fiber adapter 700, the OTDR emission light may be reflected at the fiber end face of the optical fiber ferrule in the optical fiber adapter 700 due to the difference of transmission media, so as to generate second OTDR reflection light, and the second OTDR reflection light may return to the light emitting component 400 along the original path, so that the light emitting performance of the light emitting component 400 is affected.

In order to avoid that the second OTDR reflected light reflected at the end face of the optical fiber returns to the optical transmitting assembly 400, the optical assembly in the circular square tube 910 further includes an optical isolator 950, the optical isolator 950 is located between the optical transmitting assembly 400 and the optical filter 930, the OTDR emitted light generated by the optical transmitting assembly 400 directly penetrates through the optical isolator 950 and the optical filter 930 to be injected into the optical fiber adapter 700, the second OTDR reflected light reflected at the end face of the optical fiber from the OTDR emitted light may penetrate through the optical filter 930 but cannot penetrate through the optical isolator 950, so that the second OTDR reflected light reflected at the end face of the optical fiber cannot return to the optical transmitting assembly 400, and the light emitting performance of the optical transmitting assembly 400 is ensured.

In some embodiments, the light transceiver 900 is a light emitting and receiving component, when the light transceiver 900 is a conventional light transceiver, the light emitting component 400 generates emitted light with one wavelength, the light receiving component 500 receives received light with another wavelength, and the emitted light may also enter the light receiving component 500 to cause crosstalk to the light receiving component 500, however, when the light transceiver 900 works normally, the received light enters, the intensity of the received light is larger, the intensity of the crosstalk generated by the emitted light is smaller, and the crosstalk of the crosstalk generated by the emitted light is particularly small, so that the receiving sensitivity of the received light is not affected.

However, when the optical transceiver 900 is used to detect the OTDR performance of the optical fiber, the optical transmitter 400 generates an emission light with one wavelength, when the optical transceiver 900 is operating normally, no receiving light is injected, only when the optical fiber link is abnormal, such as a break point, the OTDR reflection light is injected into the optical transceiver 900, the optical receiver 500 receives the OTDR reflection light of the optical fiber link, and when the optical transceiver 900 is operating normally, since the wavelength of the OTDR emission light is the same as the wavelength of the OTDR reflection light, crosstalk light generated by the emission light may be injected into the optical receiver 500, and at this time, the crosstalk light may cause signal crosstalk, and technicians may misjudge that the optical fiber link is abnormal, thereby affecting the OTDR detection performance of the optical fiber.

When the optical receiving module 500 is an OTDR receiving module, in order to avoid crosstalk caused by OTDR emission light on OTDR reflection light of an optical fiber link, crosstalk light generated by OTDR emission light needs to be eliminated.

In some embodiments, since the optical filter 930 is a semi-transparent and semi-reflective film, when the OTDR emission light passes through the optical filter 930, part of the OTDR emission light is reflected at the optical filter 930, and the reflected OTDR emission light is diffusely reflected in the round square tube 910, so that crosstalk light is formed, and the crosstalk light may be emitted into the optical receiving assembly 500, so that the crosstalk light formed by the optical filter 930 may cause signal crosstalk to the first OTDR reflection light, and this crosstalk may affect an attenuation blind area of the OTDR, resulting in a larger attenuation blind area of the OTDR, thereby affecting the monitoring performance of the OTDR.

In order to avoid signal crosstalk caused by crosstalk light formed at the optical filter 930 by the OTDR emission light, the optical assembly in the round square tube body 910 further includes a first light absorbing sheet 940, where the first light absorbing sheet 940 is disposed on a reflection light path of the OTDR emission light reflected by the optical filter 930, and the first light absorbing sheet 940 can absorb the OTDR emission light reflected at the optical filter 930, so that the OTDR emission light is prevented from entering the optical receiving assembly 500, and the OTDR performance of the optical module is ensured.

Referring to fig. 6 and 8, a fourth nozzle 904 is further formed on the fourth side wall (bottom surface) of the circular square tube body 910, the fourth nozzle 904 is communicated with the inner cavity of the circular square tube body 910, the fourth nozzle 904 is located between the first nozzle and the third nozzle 903, and the fourth nozzle 904 is disposed opposite to the second nozzle 902. The light absorbing sheet support 920 is embedded in the fourth pipe port 904, and the first light absorbing sheet 940 is installed in the light absorbing sheet support 920, so that the first light absorbing sheet 940 is installed in the circular square pipe body 910 through the light absorbing sheet support 920, so that the first light absorbing sheet 940 can absorb the OTDR emitted light reflected at the optical filter 930.

Fig. 10 is a first cross-sectional view of a round square tube body in an optical module according to some embodiments of the present disclosure, and fig. 11 is a second cross-sectional view of a round square tube body in an optical module according to some embodiments of the present disclosure. As shown in fig. 10 and 11, in order to install the optical module in the circular-square tube body 910, an installation surface 905 is formed in the circular-square tube body 910, the installation surface 905 is inclined, the optical filter 930 is installed on the installation surface 905, the transmission surface of the optical filter 930 faces the through hole 901, and the reflection surface of the optical filter 930 faces the second nozzle 902, so that the optical filter 930 is installed in the circular-square tube body 910.

The circular square tube body 910 is further formed therein with a first connecting hole 906 and a second connecting hole 907, the first connecting hole 906 penetrates through the mounting surface 905, the second connecting hole 907 is located between the through hole 901 and the first connecting hole 906, the through hole 901 and the second connecting hole 907 are communicated with the first connecting hole 906, and the optical isolator 950 is mounted in the second connecting hole 907.

Thus, after the optical transmitter assembly 400 is inserted into the through hole 901, the OTDR emission light generated by the optical transmitter assembly 400 is transmitted through the optical isolator 950, the OTDR emission light transmitted through the optical isolator 950 is transmitted to the optical filter 930 through the first connection hole 906, and the OTDR emission light is coupled into the optical fiber adapter 700 inserted into the third nozzle 903 through the optical filter 930, so as to implement emission of the OTDR emission light.

In some embodiments, since the optical filter 930 is a semi-transparent and semi-reflective film, the optical filter 930 divides the OTDR emitted light into a first OTDR light beam and a second OTDR light beam, where the first OTDR light beam is directly transmitted through the optical filter 930 and enters the optical fiber adapter 700, and the second OTDR light beam is reflected downward.

The second OTDR spectrum is referred to as crosstalk light, because the crosstalk light is diffusely reflected in the round square tube body 910, when the crosstalk light enters the light receiving assembly 500, the crosstalk light will cause crosstalk to the OTDR, and therefore, a light hole 908 is formed in the round square tube body 910, the light hole 908 communicates the inner cavity of the round square tube body 910 with the fourth tube port 904, so that the second OTDR spectrum passes through the light hole 908 and enters the fourth tube port 904, the second OTDR spectrum is diffusely reflected in the fourth tube port 904, the diffusely reflected light will not enter the round square tube body 910 through the light hole 908, and the second OTDR spectrum will not enter the light receiving assembly 500 to cause signal crosstalk.

In some embodiments, since the fourth port 904 is embedded with the light absorbing sheet support 920, the light absorbing sheet support 920 is provided with the first light absorbing sheet 940, and after the second OTDR light beam passes through the light hole 908 and is incident into the fourth port 904, the first light absorbing sheet 940 absorbs the second OTDR light beam, so as to eliminate the second OTDR light beam, and avoid the second OTDR light beam from causing signal crosstalk to the OTDR reflected light.

Fig. 12 is a block diagram of a light absorbing sheet holder in an optical module according to some embodiments of the present disclosure. As shown in fig. 12, the light absorbing sheet support 920 includes a support table 9201 and support columns 9202, the support columns 9202 are mounted on the support table 9201, and the diameter of the support table 9201 is larger than the diameter of the support columns 9202. The supporting table 9201 is embedded into the fourth pipe orifice 904, the outer side surface of the supporting table 9201 is fixedly adhered to the inner side wall of the fourth pipe orifice 904, and the bottom surface of the supporting table 9201 is flush with the bottom surface of the round square pipe body 910, so that the fixed connection between the light absorbing sheet support 920 and the round square pipe body 910 is realized.

The support columns 9202 are two-end asymmetric columns with one end having a short height relative to the other end, e.g., the height dimension of the support columns 9202 near one end (left end) of the light emitting assembly 400 is less than the height dimension of the support columns 9202 near one end (right end) of the fiber optic adapter 700. The support column 9202 is formed with an assembling surface 9203, the assembling surface 9203 is inclined from a relatively longer end to a relatively shorter end of the support column 9202, that is, a distance between the assembling surface 9203 and the support table 9201 is gradually increased along a light emitting direction (left-right direction) of the light emitting assembly 400, and the first light absorbing sheet 940 is adhered to the assembling surface 9203.

In some embodiments, the first light absorbing sheet 940 is used to absorb the crosstalk light, however, the first light absorbing sheet 940 has a certain specular reflection, and reflects a part of the crosstalk light that is not absorbed, so that the first light absorbing sheet 940 cannot absorb the whole crosstalk light, and for this purpose, the mounting surface 9203 is obliquely arranged, so that the first light absorbing sheet 940 is obliquely arranged. When the first light absorbing sheet 940 is obliquely arranged, the unabsorbed crosstalk light can be dispersed along other transmission directions, so that the unabsorbed crosstalk light can be prevented from being reflected to the optical filter 930 along the original path, and further, the crosstalk light is prevented from being reflected by the optical filter and returning to the light emitting assembly 400, and the light emitting performance of the light emitting assembly 400 is ensured.

In some embodiments, when the first optical absorber 940 absorbs the second OTDR light, a small portion of the second OTDR light is diffusely reflected at the first optical absorber 940, so as to avoid that the second OTDR light is diffusely reflected in the fourth pipe port 904 and is emitted into the round square pipe body 910 through the light hole 908, the diameter size of the light hole 908 is smaller than the diameter size of the fourth pipe port 904, so as to reduce that diffuse reflection light is emitted into the round square pipe body 910 through the light hole 908, so that the second OTDR light is not emitted into the light receiving assembly 500 to cause signal crosstalk.

In some embodiments, to attenuate the energy of the second OTDR spectrum in the fourth port 904, the center of the mounting surface 9203 may be a hollow structure, and the two ends may be solid surfaces, and the first light absorbing sheet 940 is adhered to the solid surfaces at the two ends of the mounting surface 9203. Due to the hollow structure at the center of the mounting surface 9203, the entire surface of the first light absorbing sheet 940 is not in contact with the mounting surface 9203 when the first light absorbing sheet 940 is adhered to the mounting surface 9203. If the entire surface of the first light absorbing sheet 940 is in contact with the mounting surface 9203, the crosstalk light not absorbed by the first light absorbing sheet 940 is reflected along the mounting surface 9203, and thus, the mounting surface 9203 of the hollow design may reduce the reflection amount of the crosstalk light.

In some embodiments, the hollow structure of the mounting surface 9203 may be a cavity, and the hole 9205 is formed on the mounting surface 9203, and the hole 9205 is communicated with the inner cavity of the support column 9202, so that, since the light absorbing sheet 940 has a certain transmittance, the crosstalk light not absorbed by the first light absorbing sheet 940 is transmitted to the inner cavity of the support column 9202 through the hole 9205 of the mounting surface 9203, the inner cavity of the support column 9202 provides a diffuse reflection space for the transmitted crosstalk light, so that the transmitted crosstalk light is diffusely reflected in the inner cavity of the support column 9202 to weaken the energy of the crosstalk light, and avoid the crosstalk light from being reflected out again through the first light absorbing sheet 940.

In some embodiments, the support column 9202 may further be formed with a limiting surface 9204, where the limiting surface 9204 is obliquely disposed, i.e. the distance between the limiting surface 9204 and the support table 9201 is gradually reduced along the left-right direction, and the right end of the limiting surface 9204 is connected with the left end of the assembling surface 9203, so that the limiting surface 9204 and the assembling surface 9203 form a V-shaped structure. When the first light absorbing sheet 940 is mounted on the mounting surface 9203, the left end face of the first light absorbing sheet 940 is adhered to the limiting surface 9204, and the bottom face of the first light absorbing sheet 940 is adhered to the mounting surface 9203, so that the inclination angle of the first light absorbing sheet 940 is ensured through the V-shaped structure, and when diffuse reflection occurs on the first light absorbing sheet 940, diffuse reflection light cannot pass through the light holes 908.

In some embodiments, a groove 9206 is formed at the connection between the limiting surface 9204 and the mounting surface 9203, when the first light absorbing sheet 940 is adhered to the mounting surface 9203 and the limiting surface 9204 by using glue, the glue overflows under the action of gravity, and the overflowed glue can cause the first light absorbing sheet 940 to warp or adhere loose, so that the groove 9206 is formed on the support column 9202, and the overflowed glue is collected through the groove 9206, so as to avoid the adverse effect of the overflowed glue on the first light absorbing sheet 940.

In some embodiments, the groove 9206 not only can collect overflowed glue, but also can avoid structural residues on the processing of the support column 9202 due to the arrangement of the groove 9206, so that the first light absorbing sheet 940 and the light absorbing sheet support 920 can avoid each other, so as to ensure the mounting accuracy of the first light absorbing sheet 940.

The first light absorbing sheet 940 is arranged on the reflection light path of the optical filter 930, the first light absorbing sheet 940 can absorb most of the second OTDR light, the first light absorbing sheet 940 can reflect and transmit less of the second OTDR light (respectively referred to as reflected light and transmitted light), and the first light absorbing sheet 940 is obliquely arranged to disperse the reflected light along other transmission directions so as to avoid the reflected light returning to the optical filter 930; the cavity in the support column 9202 provides a diffuse reflection space for the transmitted light, so that the transmitted light is diffusely reflected in the cavity, the energy of the second OTDR light splitting is weakened, and the second OTDR light splitting is prevented from being reflected out again through the first light absorbing sheet 930.

The OTDR emission light emitted by the optical emission component 400 is transmitted to the optical fiber adapter 700 through the optical filter 930, and the OTDR emission light is transmitted to the external optical fiber 101 through the optical fiber ferrule in the optical fiber adapter 700, and due to different transmission mediums, the OTDR emission light is easily reflected at the optical fiber end face of the optical fiber ferrule to form second OTDR reflection light, and the second OTDR reflection light may return to the optical emission component 400 along the original path, so as to affect the light emitting performance of the optical emission component 400.

Fig. 13 is a cross-sectional view of a fiber optic adapter in an optical module provided in accordance with some embodiments of the present disclosure. As shown in fig. 13, the optical fiber adapter 700 includes a connection sleeve 701, an outer sleeve 702, an inner sleeve 703, an internal optical fiber 704 and an optical fiber ferrule 705, the connection sleeve 701 is fixedly connected with the outer sleeve 702, the inner sleeve 703 is fixed on the inner cavity side wall of the outer sleeve 702, the internal optical fiber 704 is fixed in the inner cavity of the outer sleeve 702 through the inner sleeve 703, the optical fiber ferrule 705 is inserted into the connection sleeve 701, the light emitting end surface of the optical fiber ferrule 705 is connected with the light entering end surface of the internal optical fiber 704, and the left end surface of the optical fiber ferrule 705 protrudes out of the left end surface of the connection sleeve 701.

When the optical fiber adapter 700 is connected to the circular square tube 910, the left end of the connection sleeve 701 is inserted into the second adjustment sleeve, and the left end of the optical fiber ferrule 705 is inserted into the third nozzle 903, thereby connecting the optical fiber adapter 700 to the circular square tube 910.

In some embodiments, the OTDR emission light emitted by the optical emission component 400 is transmitted to the optical fiber adapter 700 through the optical filter 930, where the OTDR emission light is easily reflected at the optical fiber end face (left end face) of the optical fiber ferrule 705, in order to avoid the light path reflected at the optical fiber end face from returning to the optical emission component 400, the optical fiber end face of the optical fiber ferrule 705 is set to an inclined end face, that is, a second preset angle is formed between the optical fiber end face of the optical fiber ferrule 705 and the vertical plane, so that the second OTDR reflection light reflected at the optical fiber end face is emitted along other transmission directions, and the second OTDR reflection light is prevented from returning to the optical emission component 400 along the original path.

The OTDR emission light emitted by the optical emission component 400 is emitted into the optical fiber adapter 700 through the optical filter 930, the OTDR emission light is transmitted to the external optical fiber 101 through the optical fiber adapter 700, the first OTDR reflection light of the optical fiber link reflected at each node of the external optical fiber 101 is transmitted from the optical fiber to the optical filter 930, the optical filter 930 is a semi-transparent and semi-reflective film, part of the first OTDR reflection light is reflected to the optical receiving component 500 through the optical filter 930, and part of the first OTDR reflection light is emitted into the optical emission component 400 through the optical filter 930, so as to affect the light emitting performance of the optical emission component 400.

In order to avoid that the first OTDR reflected light is emitted into the optical transmitter assembly 400 through the optical filter 930, the optical fiber ferrule 705 is obliquely disposed, i.e. a first preset angle is formed between the central axis of the optical fiber ferrule 705 and the light emitting direction (left-right direction) of the optical transmitter assembly 400, so that an angle is formed between the OTDR reflected light and the first OTDR reflected light.

In some embodiments, a first predetermined angle between the central axis of the fiber stub 705 and the light emission direction of the light emission assembly 400 is 3.7 ° to 5.8 °, and a second predetermined angle between the fiber end face of the fiber stub 705 and the vertical plane is 8 ° to 12 °.

In some embodiments, the first preset angle is 3.7 ° and the second preset angle is 8 °.

Fig. 14 is a cross-sectional view of an optical transceiver component in an optical module according to some embodiments of the present disclosure. As shown in fig. 14, the OTDR emission light emitted by the light emitting assembly 400 is transmitted through the optical filter 930 into the optical fiber of the optical fiber ferrule 705, and the first OTDR reflection light of the optical fiber link reflected from each node of the external optical fiber 101 is transmitted from the optical fiber to the air, and because the optical fiber end surface of the optical fiber ferrule 705 is obliquely arranged, the first OTDR reflection light is refracted when transmitted from the optical fiber of the optical fiber ferrule 705 to the air, so that an included angle of 3.7 ° is formed between the first OTDR reflection light and the OTDR emission light.

Since the optical filter 930 is selected to transmit and reflect the light wavelength by the thickness of the surface coating film system, the transmission band and the reflection band of the film system are offset by 7nm at the same time when the included angle between the emitted light and the optical filter 930 is changed by 1 degree. When the angle between the OTDR emitted light and the optical filter 930 is 45 ° and the angle between the first OTDR emitted light and the OTDR reflected light is 3.7 °, the first OTDR reflected light forms a relative angle of 41.3 ° with the optical filter 930, and according to the design that the optical path and the film system angle each change by 1 °, the film system transmission band and the reflection band deviate by about 7nm, the film system deviation of about 26nm is formed by 3.7 °, the transmission band reflection of just over 20nm reaches the reflection band, so that the first OTDR reflected light is reflected to the light receiving assembly 500 through the optical filter 930, and does not penetrate the optical filter 930 to the light emitting assembly 400, thereby ensuring the light emitting performance of the light emitting assembly 400.

In some embodiments, due to the inclined arrangement of the optical fiber ferrule 705, the optical fiber end face of the optical fiber ferrule 705 is inclined, and part of the OTDR emitted light that has passed through the optical filter 930 is reflected at the optical fiber end face to form second OTDR reflected light, and the second OTDR reflected light is transmitted in a lower left direction, and part of the second OTDR reflected light may be transmitted to the optical filter 930, and the second OTDR reflected light is reflected again at the optical filter 930, and the reflected second OTDR reflected light is easy to be incident into the optical receiving assembly 500, so that the second OTDR reflected light causes signal crosstalk to the first OTDR reflected light.

In order to prevent the second OTDR reflected light reflected by the end surface of the optical fiber from being reflected into the optical receiving assembly 500 through the optical filter 930, the optical reflecting assembly 980 is further disposed in the round square tube 910, the optical reflecting assembly 980 is located on the reflection path of the OTDR emitted light on the end surface of the optical fiber, and the optical reflecting assembly 980 is located between the optical filter 930 and the optical fiber ferrule 705, so that the second OTDR reflected light reflected by the end surface of the optical fiber is reflected by the optical reflecting assembly 980 again, so that the second OTDR reflected light cannot be emitted to the optical filter 930, and the second OTDR reflected light reflected by the end surface of the optical fiber is prevented from being reflected to the optical receiving assembly 500 through the optical filter 930.

The circular square tube body 910 is further internally provided with a light through hole 909, the light through hole 909 is communicated with the inner cavity of the circular square tube body 910 and the fourth tube port 904, the light through hole 909 is positioned between the light reflecting component 980 and the third tube port 903, the second OTDR reflected light reflected by the fiber end face is reflected again at the light reflecting component 980, the second OTDR reflected light reflected again passes through the light through hole 909 and is emitted into the fourth tube port 904, so that the second OTDR reflected light reflected by the fiber end face enters the fourth tube port 904, and the second OTDR reflected light is diffusely reflected in the cavity of the fourth tube port 904, so that signal crosstalk caused by the second OTDR reflected light to the first OTDR reflected light is reduced.

In some embodiments, a third light absorbing sheet 990 may be further disposed in the fourth pipe 904, the third light absorbing sheet 990 is mounted on the light absorbing sheet support 920, and the third light absorbing sheet 990 is located below the light passing hole 909, so that the second OTDR reflected light passing through the light passing hole 909 is absorbed by the third light absorbing sheet 990, and the second OTDR reflected light reflected by the end face of the optical fiber can be eliminated, thereby further reducing signal crosstalk caused by the second OTDR reflected light on the first OTDR reflected light.

Referring to fig. 12, in order to mount the third light absorbing sheet 990, a notch is further formed on the support column 9202, where the notch includes a first support surface 9207 and a second support surface 9208, the first support surface 9207 is connected with an outer edge of the support column 9202, and the first support surface 9207 is horizontally arranged; the second support surface 9208 is connected to the first support surface 9207, and the second support surface 9208 is perpendicular to the first support surface 9207, so that the first support surface 9207 and the second support surface 9208 have an L-shaped structure.

The second support surface 9208 is located between the fitting surface 9203 and the first support surface 9207, the second support surface 9208 is connected to the second support surface 9208 through the connection surface 9209, and the connection surface 9209 is inclined, that is, the connection surface 9209 is inclined from the upper left to the lower right along the light emission direction.

The third light absorbing sheet 990 is located in the notch of the supporting column 9202, that is, the left side of the third light absorbing sheet 990 is abutted against the connecting surface 9209, the right side of the third light absorbing sheet 990 is abutted against the first supporting surface 9207, and the first supporting surface 9207, the second supporting surface 9208 and the third light absorbing sheet 990 form a triangle structure, so that the third light absorbing sheet 990 is fixedly mounted on the light absorbing sheet support 920.

The optical reflection assembly 980 reflects the second OTDR reflected light reflected by the end surface of the optical fiber into the fourth pipe port 904 again, and the second OTDR reflected light reflected again is absorbed by the third light absorbing sheet 990, so that the second OTDR reflected light reflected by the end surface of the optical fiber by the OTDR emitted light can be eliminated, and the signal crosstalk of the second OTDR reflected light to the first OTDR reflected light of the optical fiber link is reduced.

Fig. 15 is a first structural diagram of a light reflection assembly in an optical module provided according to some embodiments of the present disclosure, fig. 16 is an exploded view of a light reflection assembly in an optical module provided according to some embodiments of the present disclosure, fig. 17 is a structural diagram of a lens holder in an optical module provided according to some embodiments of the present disclosure, and fig. 18 is a side view of a lens holder in an optical module provided according to some embodiments of the present disclosure. As shown in fig. 15, 16, 17 and 18, the optical reflection assembly includes a lens support 9801 and a converging lens 9802, the lens support 9801 is mounted between the optical filter 930 and the optical fiber end face, a reflection surface 9805 is formed on a side of the lens support 9801 facing the optical fiber end face, the reflection surface 9805 is located on a reflection light path of the OTDR emitted light on the optical fiber end face, and the second OTDR reflected light reflected by the optical fiber end face is reflected again at the reflection surface 9805.

The reflecting surface 9805 is obliquely arranged from bottom left to top right along the light emitting direction of the light transceiver 900, and the reflecting surface 9805 reflects the second OTDR reflected light to the bottom right, so that the second OTDR reflected light reflected by the end surface of the optical fiber is far away from the optical filter 930 and the light receiving assembly 500.

The converging lens 9802 is mounted on the lens support 9801, the converging lens 9802 is located below the reflecting surface 9805, the converging lens 9802 converges the second OTDR reflected light reflected by the reflecting surface 9805, and the converged light passes through the light passing hole 909 and is injected into the cavity of the fourth pipe orifice 904, so that the second OTDR reflected light reflected again by the light reflecting component 980 is diffusely reflected in the cavity of the fourth pipe orifice 904.

Referring to fig. 17, in some embodiments, the lens support 9801 includes a bottom surface, a top surface 9804, a first side surface 9803 and a reflecting surface 9805, the bottom surface is horizontally fixed on the inner wall of the circular square tube 910, the top surface 9804 is horizontally arranged, the area size of the top surface 9804 is larger than the area size of the bottom surface, and the OTDR emitted light passing through the optical filter 930 does not pass through the top surface 9804, so as to avoid the lens support 9801 from affecting the transmission of the OTDR emitted light.

The first side surface 9803 and the reflecting surface 9805 are positioned on the same side of the lens bracket 9801, the first side surface 9803 is vertically arranged, the reflecting surface 9805 is obliquely arranged, and the first side surface 9803 is connected with the reflecting surface 9805; the first side 9803 is formed with a mounting groove 9806, the extending direction of the mounting groove 9806 is perpendicular to the light emitting direction of the light transceiver 900, and the converging lens 9802 is embedded in the mounting groove 9806 to connect the lens holder 9801 with the converging lens 9802.

In order to make the second OTDR reflected light reflected by the end face of the optical fiber reflect to the converging lens 9802 again through the reflecting surface 9805, the reflected second OTDR reflected light is converged into the cavity of the fourth pipe port 904 through the converging lens 9802, the height dimension of the lens support 9801 is L1, a third preset angle α is formed between the reflecting surface 9805 and the light emitting direction, and the dimension of the reflecting surface 9805 is L2.

In some embodiments, the height dimension L1 of the lens holder 9801 is 0.82cm, the dimension L2 of the reflective surface 9805 is 0.48cm, the dimension L3 between the right end face of the converging lens 9802 and the right end face of the lens holder 9801 is 0.12cm, the third preset angle α matches the first preset angle and the second preset angle, and the third preset angle α is 56.7 ° when the first preset angle is 3.7 ° and the second preset angle is 8 °.

In some embodiments, the lens mount 9801 may be a metal mount, the reflective surface 9805 is a metal surface, the metal surface is polished to reflect, and then the converging lens 9802 is attached to the metal mount.

In some embodiments, the lens support 9801 may also be a glass support, and the reflecting surface of the glass is coated with a reflecting film, so that the reflecting surface reflects the reflected light of the end face of the optical fiber, and then the converging lens 9802 is attached to the glass support.

Fig. 19 is a block diagram of a converging lens in an optical module according to some embodiments of the present disclosure. As shown in fig. 19, the converging lens 9802 is a spherical lens, a plug 9807 is formed on the converging lens 9802, the plug 9807 wraps the converging lens 9802, and the left side of the plug 9807 is inserted into the mounting groove 9806 to fix the converging lens 9802 on the lens holder 9801.

Fig. 20 is a partial cross-sectional view of an optical transceiver component in an optical module provided according to some embodiments of the present disclosure. As shown in fig. 20, the OTDR emission light transmitted through the optical filter 930 is coupled into the optical fiber stub 705 to transmit the OTDR emission light into the external optical fiber 101, and part of the OTDR emission light is reflected at the fiber end face of the optical fiber stub 705 due to the change of the transmission medium, and the fiber end face of the optical fiber stub 705 is obliquely arranged due to the oblique arrangement of the optical fiber stub 705, so that the second OTDR reflection light reflected by the fiber end face is emitted leftward and downward.

The second OTDR reflected light is reflected again at the reflection surface 9805 of the lens holder 9801, the reflected second OTDR reflected light is incident into the converging lens 9802, the reflected second OTDR reflected light is converged into the fourth pipe port 904 through the converging lens 9802, and the converged light is absorbed by the third light absorbing sheet 990 in the fourth pipe port 904.

Because the third light absorbing sheet 990 has a certain specular reflection, the third light absorbing sheet 990 reflects part of the re-reflected light which is not absorbed, and the re-reflected light which is not absorbed is diffusely reflected in the cavity of the fourth pipe port 904, and because the size of the light through hole 909 is smaller, the diffusely reflected light cannot penetrate into the cavity of the round square pipe body 910 through the light through hole 909, so that the diffusely reflected light leaks out of the cavity of the fourth pipe port 904, and the diffusely reflected light also cannot cause signal crosstalk to the first OTDR reflected light of the optical fiber link.

The second OTDR reflected light not absorbed by the third light absorber 990 may penetrate the third light absorber 990, and the second OTDR reflected light penetrating the third light absorber 990 is transmitted to the first supporting surface 9207 and the second supporting surface 9208, and the second OTDR reflected light is reflected again at the first supporting surface 9207 and the second supporting surface 9208, so that the second OTDR reflected light is absorbed by the third light absorber 990, and the light absorption effect is improved.

In some embodiments, the light reflecting component 980 may be a split structure, and the light reflecting component 980 may be a unitary structure, where the second OTDR reflected light reflected by the fiber end face is reflected into the cavity of the fourth port 904 by the light reflecting component 980.

Fig. 21 is a second block diagram of a light reflection assembly in an optical module according to some embodiments of the present disclosure, and fig. 22 is a side view of a light reflection assembly in an optical module according to some embodiments of the present disclosure. As shown in fig. 21 and 22, the light reflection assembly 980 includes a lens support 9801 and a converging lens 9802, a reflection surface 9805 and a supporting block are formed on a side of the lens support 9801 facing the optical fiber ferrule 705, the supporting block protrudes from a right side surface of the lens support 9801, and a lower end of the reflection surface 9805 is connected with the supporting block. The converging lens 9802 is a spherical lens, the converging lens 9802 is fixed on the supporting block, and the lens support 9801 and the converging lens 9802 are of an integrated structure, so that the optical coupling between the reflecting surface 9805 and the converging lens 9802 is directly realized, and the coupling butt joint is not needed.

In order to make the second OTDR reflected light reflected by the end face of the optical fiber reflect to the converging lens 9802 again through the reflecting surface 9805, the reflected second OTDR reflected light is converged into the cavity of the fourth pipe orifice 904 through the converging lens 9802, the height dimension of the lens support 9801 is L1, a third preset angle α is formed between the reflecting surface 9805 and the light emitting direction, the dimension of the reflecting surface 9805 is L2, and a dimension L3 is formed between the right end face of the converging lens 9802 and the right end face of the lens support 9801.

In some embodiments, the height dimension L1 of the lens holder 9801 is 0.82cm, the dimension L2 of the reflective surface 9805 is 0.48cm, the dimension L3 between the right end face of the converging lens 9802 and the right end face of the lens holder 9801 is 0.12cm, and the third preset angle α between the reflective surface 9805 and the light emission direction is 56.7 °.

Fig. 23 is a partial cross-sectional view two of an optical transceiver component in an optical module according to some embodiments of the present disclosure. As shown in fig. 23, the OTDR emitted light emitted by the optical emission component 400 is emitted to the optical filter 930 through the optical isolator 950, part of the OTDR emitted light is directly coupled to the optical fiber ferrule 705 of the optical fiber adapter 700 through the optical filter 930, so as to transmit the OTDR emitted light to the external optical fiber 101, the OTDR emitted light is reflected at each node of the optical fiber to generate first OTDR reflected light, the first OTDR reflected light is transmitted into the round square tube 910 through the optical fiber adapter 700, and the first OTDR reflected light is reflected to the optical receiving component 500 through the optical filter 930, so as to detect whether the optical fiber link is abnormal or not through the optical receiving component 500.

Because the optical fiber ferrule 705 is disposed obliquely with respect to the light emitting direction of the optical transceiver 900, an included angle is formed between the OTDR emitted light entering the optical fiber ferrule 705 and the first OTDR reflected light emitted from the optical fiber ferrule 705, when the first OTDR reflected light reaches the optical filter 930, the first OTDR reflected light cannot penetrate the optical filter 930, and the first OTDR reflected light can only be reflected at the optical filter 930, thereby ensuring the light emitting performance of the light emitting assembly 400 and improving the OTDR detection performance of the optical module.

Part of the OTDR emission light is reflected at the optical filter 930, the reflected light is injected into the fourth pipe port 904 through the light transmitting hole 908, and the reflected light is absorbed by the first light absorbing sheet 940 in the fourth pipe port 904, so that crosstalk caused by the reflected light of the OTDR emission light at the optical filter 930 to the first OTDR reflection light is avoided.

Due to different transmission media, part of the OTDR emitted light passing through the optical filter 930 is reflected at the optical fiber end face of the optical fiber ferrule 705, the second OTDR reflected light reflected by the optical fiber end face is emitted to the left and the lower side, the second OTDR reflected light is reflected again at the reflecting surface 9805 of the lens bracket 9801, the reflected second OTDR reflected light is incident into the converging lens 9802, the reflected second OTDR reflected light is converged into the fourth pipe port 904 through the converging lens 9802, the reflected second OTDR reflected light is absorbed by the third light absorbing sheet 990 in the fourth pipe port 904, and crosstalk of the second OTDR reflected light to the first OTDR reflected light is avoided.

In the optical module provided by the embodiment of the disclosure, the optical emission component, the optical receiving component and the optical fiber adapter are respectively inserted into the round square tube body, the optical reflection component is added between the optical filter in the round square tube body and the optical fiber end face of the optical fiber ferrule of the optical fiber adapter, the OTDR emission light generated by the optical emission component enters the optical fiber end face through the optical filter, the second OTDR reflection light reflected by the optical fiber end face is reflected and converged through the optical reflection component, the second OTDR reflection light reflected by the optical fiber end face is converged and enters the cavity below the round square tube body, the third light absorption sheet is added in the cavity, the second OTDR reflection light which enters the cavity is absorbed by the third light absorption sheet, and the second OTDR reflection light which is not absorbed by the third light absorption sheet is diffusely reflected in the cavity, so that the second OTDR reflection light is prevented from leaking into the optical receiving component, the signal crosstalk of the first OTDR reflection light of the optical fiber link by the second OTDR reflection light is reduced, and the OTDR performance of the optical module is ensured.

Finally, it should be noted that: the above embodiments are merely for illustrating the technical solution of the present disclosure, and are not limiting thereof; although the present disclosure has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present disclosure.

Claims

1. An optical module, comprising:

a circuit board;

wherein the optical transceiver comprises:

2. The light module of claim 1 wherein the light reflecting assembly comprises:

the lens bracket is arranged in the inner cavity of the round square tube body, a reflecting surface is formed on one side, facing the optical fiber inserting core, of the lens bracket, the reflecting surface is obliquely arranged, and the reflecting surface is used for reflecting second OTDR reflected light reflected by the end face of the optical fiber again;

and the converging lens is arranged on the lens bracket and is used for converging the second OTDR reflected light from the reflecting surface into the fourth pipe orifice.

3. The optical module according to claim 2, wherein the lens holder includes a bottom surface horizontally fixed to an inner wall of the circular square tube body, a top surface having an area larger than an area of the bottom surface, and a first side surface, the reflection surface being inclined from the top surface toward one side of the optical fiber end surface toward the top surface toward one side of the optical filter;

the first side face and the reflecting face are located on the same side of the lens support, a mounting groove is formed in the first side face, the first side face is connected with the mounting groove, and the converging lens is embedded in the mounting groove.

4. A light module as recited in claim 3, wherein a plug post is formed on the converging lens, the plug post wrapping the converging lens, one end of the plug post being inserted into the mounting slot.

5. The optical module of claim 2, wherein a support block is formed on a side of the lens holder facing the optical fiber ferrule, the converging lens is fixed to the support block, and the lens holder and the converging lens are in an integral structure.

6. An optical module according to claim 3 or 5, wherein a third predetermined angle is provided between the reflecting surface and the top surface of the lens holder, and the third predetermined angle, the first predetermined angle and the second predetermined angle have a predetermined relationship, so that the second OTDR reflected light is reflected again by the reflecting surface and then enters the fourth nozzle.

7. The light module of claim 6 wherein the first predetermined angle is 3.7 ° to 5.8 ° and the second predetermined angle is 8 ° to 12 °.

8. The light module of claim 7 wherein the first preset angle is 3.7 °, the second preset angle is 8 °, and the third preset angle is 56.7 °.

9. The light module as recited in claim 1, wherein the light absorbing assembly comprises:

the light absorption sheet bracket is embedded in the fourth pipe orifice;

the first light absorption sheet is arranged on the light absorption sheet bracket, is positioned on a reflection light path of the optical filter and is used for absorbing the reflection light from the optical filter;

the third light absorption sheet is arranged on the light absorption sheet support, is positioned on the reflection and convergence light path of the light reflection assembly, and is used for absorbing the second OTDR reflected light from the light reflection assembly.

10. The light module of claim 9 wherein the light absorbing sheet holder comprises:

the support table is embedded in the fourth pipe orifice;

the support column is arranged on the support table, an assembling surface is formed on the support column, the assembling surface is obliquely arranged, and the first light absorption sheet is arranged on the assembling surface; and a notch is further formed on the support column and is connected with the assembly surface through a connecting surface, and the third light absorption sheet is obliquely arranged in the notch.