CN110596829A

CN110596829A - Optical module with OTDR function

Info

Publication number: CN110596829A
Application number: CN201910872795.8A
Authority: CN
Inventors: 孙飞龙; 刘湘容
Original assignee: Hisense Broadband Multimedia Technology Co Ltd
Current assignee: Hisense Broadband Multimedia Technology Co Ltd
Priority date: 2019-09-16
Filing date: 2019-09-16
Publication date: 2019-12-20
Anticipated expiration: 2039-09-16
Also published as: CN110596829B

Abstract

The application discloses an optical module with OTDR function, including an optical transceiver module, the optical transceiver module includes a housing and an optical transmitting end, an optical transceiver integrated end and an optical receiving end which are respectively connected with the housing, a first polarization beam splitting prism assembly, a Faraday rotator, a half-wave plate and a second polarization beam splitting prism assembly are arranged in the housing, data light or detection light emitted by the optical transmitting end passes through the first polarization beam splitting prism assembly, the Faraday rotator, the half-wave plate and the second polarization beam splitting prism assembly in sequence to perform polarization beam splitting and polarization beam combining, and the combined data light or detection light enters the optical transceiver integrated end; the reflected detection light from the light receiving and transmitting integrated body end sequentially passes through the second polarization beam splitting prism assembly, the half-wave plate, the Faraday rotator and the first polarization beam splitting prism assembly to perform polarization beam splitting and polarization beam combination, and the combined light enters the detection light receiving end. The transmission routes of the emitted light and the received light of the optical module are different, so that crosstalk caused by the emitted light to the received light is small.

Description

Optical module with OTDR function

Technical Field

The present application relates to the field of optical communications technologies, and in particular, to an optical module having an OTDR function.

Background

With the development of Optical communication becoming faster and faster, Optical fibers are laid more and more, and intelligent monitoring of Optical fiber resources becomes more and more urgent, so that most Optical modules start to be built with an OTDR (Optical Time Domain Reflectometer) function, and monitor the performance of the Optical fibers through the OTDR technology to determine events such as Optical fiber fusion joints, connectors, or breakage.

The OTDR uses its laser light source to send an optical pulse to the measured optical fiber, where the optical pulse has an optical signal reflected back to the OTDR on the optical fiber itself and each characteristic point, and the reflected optical signal is coupled to the receiver of the OTDE through a direction and converted into an electrical signal, and finally the result curve is displayed on the display screen. Therefore, an OTDR built in an optical module needs a single-fiber bidirectional and same-wavelength optical transceiver module, and the conventional scheme is as follows: the filtering mode of 45 filters + extinction piece, 45 filters are half transmission half reflection wave plate, and the extinction piece is located the below of filter, and the light that laser source transmitted reachs filter rear portion split light and passes through the filter, and partial pipe is reflected, and the light after the reflection is absorbed by the extinction piece, later gets into OTDR and detects.

However, since the wavelengths of the existing optical transceiver components are the same, the light emitted by the laser source may cause crosstalk to the reflected light, and the crosstalk may affect the attenuation blind area of the OTDR, causing the attenuation blind area of the OTDR to be large, and seriously affecting the performance of the OTDR optical receiver.

Disclosure of Invention

The application provides an optical module with an OTDR function, which aims to solve the problem that the crosstalk between the existing co-wavelength optical transceiver components influences the OTDR optical receiving performance.

In order to solve the technical problem, the embodiment of the application discloses the following technical scheme:

the embodiment of the application discloses an optical module with OTDR function, which comprises a circuit board and an optical transceiver component electrically connected with the circuit board, wherein,

the optical transceiving component comprises a shell, and an optical transmitting end, an optical transceiving integrated end and an optical detecting receiving end which are respectively connected with the shell, wherein the optical transmitting end transmits data light and detecting light with the same wavelength;

the first polarization beam splitting prism assembly is used for carrying out polarization beam splitting on incident data light or detection light or carrying out polarization beam combining on polarization beams from the second polarization beam splitting prism assembly; the Faraday rotator is arranged in the magnetic block and rotates the polarized and split light clockwise or anticlockwise along the light transmission direction under the action of an external magnetic field applied by the magnetic block; the half-wave plate is used for clockwise rotating the incident polarization split light along the light propagation direction; the second polarization beam splitting prism assembly is used for carrying out polarization beam combination on the rotated polarization beam splitting or carrying out polarization beam splitting on the reflected detection light;

the data light or the detection light emitted by the light emitting end is subjected to polarization splitting through the first polarization splitting prism, the split light is clockwise rotated through the Faraday rotation plate respectively, the rotated split light is clockwise rotated again through the half-wave plate respectively, the split light after being rotated again is subjected to polarization light combination through the second polarization splitting prism component, and the combined data light or the detection light enters the light receiving and transmitting integrated end;

the reflected detection light from the light receiving and transmitting integrated body end is subjected to polarization splitting through the second polarization splitting prism assembly, the split light is clockwise rotated through the half-wave plate respectively, the rotated split light is anticlockwise rotated through the Faraday rotating plate respectively, the split light which is rotated again is subjected to polarization combining through the first polarization splitting prism assembly, and the reflected detection light enters the detection light receiving end after being combined.

Compared with the prior art, the beneficial effect of this application is:

the optical module with the OTDR function comprises a circuit board and an optical transceiver component positioned on the surface of the circuit board, wherein the optical transceiver component comprises a shell, and an optical transmitting end, an optical transceiver integrated end and an optical detection receiving end which are respectively connected with the shell, and the optical transmitting end transmits data light and detection light with the same wavelength; a first polarization beam splitting prism component, a Faraday rotator, a half-wave plate and a second polarization beam splitting prism component are arranged in the shell, and the first polarization beam splitting prism component is used for carrying out polarization beam splitting on incident data light or detection light or carrying out polarization beam combining on polarization beam splitting from the second polarization beam splitting prism component; the Faraday rotator is arranged in the magnetic block and rotates the polarized and split light clockwise or anticlockwise along the light transmission direction under the action of an external magnetic field applied by the magnetic block; the half-wave plate is used for clockwise rotating the incident polarization split light along the light propagation direction; the second polarization beam splitting prism component is used for carrying out polarization beam combination on the rotated polarization beam splitting or carrying out polarization beam splitting on the reflected detection light; the data light or the detection light emitted by the light emitting end is subjected to polarization splitting through a first polarization splitting prism, the split light is clockwise rotated through a Faraday rotation plate respectively, the rotated split light is clockwise rotated again through a half-wave plate respectively, the split light which is rotated again is subjected to polarization light combination through a second polarization splitting prism assembly, and the combined data light or the detection light enters a light receiving and transmitting integrated end; the reflected detection light from the light receiving and transmitting integrated body end is subjected to polarization splitting through the second polarization splitting prism assembly, the split light is clockwise rotated through the half-wave plate respectively, the rotated split light is anticlockwise rotated through the Faraday rotating plate respectively, the split light which is rotated again is subjected to polarization light combination through the first polarization splitting prism assembly, and the reflected detection light enters the detection light receiving end after being combined. The utility model discloses a through the first polarization beam splitting prism subassembly in the casing, Faraday rotator, half wave plate and second polarization beam splitting prism subassembly respectively in the optical module carry out polarization beam splitting and polarization to close light for the transmission route of light transmitting end transmission light is inequality with the transmission route that detects the light receiving end and receive light, and so the transmission light leads to the fact crosstalk less to receiving light, and the OTDR receiver can more clearly measure the light of optical fiber reflection, thereby can improve OTDR light reception performance.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an optical module having an OTDR function according to an embodiment of the present application;

fig. 2 is an exploded schematic structural diagram of an optical module having an OTDR function according to an embodiment of the present application;

fig. 3 is a schematic partial structural diagram of an optical module having an OTDR function according to an embodiment of the present application;

fig. 4 is a schematic partial structural diagram of an optical module with an OTDR function in another angle according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of an optical transceiver module in an optical module having an OTDR function according to an embodiment of the present application;

fig. 6 is an exploded schematic structural diagram of an optical transceiver module in an optical module having an OTDR function according to an embodiment of the present application;

fig. 7 is a cross-sectional view of an optical transceiver module in an optical module with an OTDR function according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of an optical add/drop device in an optical module having an OTDR function according to an embodiment of the present application;

fig. 9 is an exploded schematic structural diagram of an optical add/drop device in an optical module having an OTDR function according to an embodiment of the present application;

fig. 10 is a schematic diagram of a partially exploded structure of an optical add/drop device in an optical module having an OTDR function according to an embodiment of the present application;

fig. 11 is a diagram of an emitted light transmission route of an optical transceiver module in an optical module with an OTDR function according to an embodiment of the present application;

fig. 12 is a reflected light transmission route diagram of an optical transceiver module in an optical module having an OTDR function according to an embodiment of the present application;

fig. 13 is a schematic structural diagram of a housing in an optical module having an ODTR function according to an embodiment of the present application;

fig. 14 is a cross-sectional view of a housing in an optical module with an OTDR function provided in an embodiment of the present application;

fig. 15 is an assembly schematic diagram of a housing and an optical splitter in an optical module with an OTDR function according to an embodiment of the present application;

fig. 16 is an assembly cross-sectional view of a housing and an optical splitter in an optical module with an OTDR function according to an embodiment of the present application;

fig. 17 is a schematic structural diagram of an optical transceiver module of another optical module with an OTDR function according to an embodiment of the present application.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

One of the core links of optical fiber communication is the conversion of optical-electrical signals, optical signals carrying information are used for optical fiber/optical waveguide transmission in optical fiber communication, and the passive transmission characteristic of light in optical fiber can be utilized to realize low-cost and low-loss information transmission. The information processing devices such as computers use electrical signals, which require the interconversion between electrical signals and optical signals during the signal transmission process.

The optical module realizes the photoelectric conversion function in the technical field of optical fiber communication, and the interconversion of optical signals and electric signals is the core function of the optical module. The optical module is electrically connected with an external upper computer through a golden finger on a circuit board, main electrical connections comprise power supply, I2C signals, data signal transmission, grounding and the like, the electrical connection mode realized by the golden finger becomes a standard mode of the optical module industry, and on the basis, the circuit board is a necessary technical characteristic in most optical modules.

The optical port of the optical module is connected with an external optical fiber and establishes bidirectional optical signal connection with the external optical fiber; the electrical port of the optical module is accessed into the optical network unit and establishes bidirectional electrical signal connection with the optical network unit; the optical module realizes the mutual conversion of optical signals and electric signals, thereby realizing the connection between the optical fiber and the optical network unit. Specifically, an optical signal from the external optical fiber is converted into an electrical signal by the optical module and then input into the optical network unit, and the electrical signal from the optical network unit is converted into an optical signal by the optical module and input into the external optical fiber. The optical module is a tool for realizing the mutual conversion of photoelectric signals, has no function of processing data, and information is not changed in the photoelectric conversion process.

Fig. 1 is a schematic diagram of an optical module with an OTDR function according to an embodiment of the present application, and fig. 2 is a schematic diagram of an exploded structure of an optical module with an OTDR function according to an embodiment of the present application.

As shown in fig. 1 and fig. 2, an optical module with OTDR function provided in this embodiment of the application includes an upper housing 10, a lower housing 20, an unlocking handle 30, a circuit board 40, and an optical transceiver module 50, wherein,

the upper shell 10 and the lower shell 20 form a wrapping cavity with two openings, specifically, two ends of the wrapping cavity are opened (60, 70) in the same direction, or two openings in different directions are opened; one of the openings is an electrical port 70 for inserting into an upper computer such as an optical network unit, the other opening is an optical port 60 for external optical fiber access to connect with internal optical fibers, and the photoelectric devices such as the circuit board 40 and the optical transceiver component 50 are positioned in the wrapping cavity.

The upper shell and the lower shell are made of metal materials generally, so that electromagnetic shielding and heat dissipation are facilitated; the assembly mode that adopts upper casing, lower casing to combine is convenient for install devices such as circuit board in the casing, generally can not make the casing of optical module structure as an organic whole, like this when devices such as assembly circuit board, locating component, heat dissipation and electromagnetic shield structure can't install, also do not do benefit to production automation yet.

The unlocking handle 30 is positioned on the outer wall of the wrapping cavity/lower shell 20, and the unlocking handle can relatively move on the surface of the outer wall by pulling the tail end of the unlocking handle; when the optical module is inserted into the upper computer, the unlocking handle fixes the optical module in the cage of the upper computer, and the clamping relation between the optical module and the upper computer is released by pulling the unlocking handle, so that the optical module can be drawn out from the cage of the upper computer.

Fig. 3 is a schematic partial structural diagram of an optical module having an OTDR function according to an embodiment of the present application; fig. 4 is a schematic partial structural diagram of an optical module with an OTDR function in another angle according to an embodiment of the present application; fig. 5 is a schematic structural diagram of an optical transceiver module in an optical module with an OTDR function according to an embodiment of the present application. As shown in fig. 3, 4 and 5, the optical transceiver module 50 of the optical module is electrically connected to the circuit board 40, the optical transceiver module 50 includes a data optical receiving end 501, an optical transceiver integrated end 502, a light emitting end 503, a detection optical receiving end 504 and a housing 505, the data optical receiving end 501 is connected to an optical conduction module, and the optical conduction module is connected to an optical fiber for receiving data light transmitted by the optical fiber; the transceiving one-body end 502 is connected with a light conduction assembly, and the light conduction assembly is connected with an optical fiber and is used for transmitting data light to the optical fiber and receiving detection light reflected by the optical fiber; the light emitting end 503 is provided with a laser emitting assembly, the laser emitting assembly emits data light and detection light with the same wavelength, and the emitted detection light is transmitted into the optical fiber connected with the light receiving and transmitting integrated end 502 and is used for detecting whether a breakpoint occurs in the optical fiber; the detection light receiving end 504 is provided with a detection receiving assembly for receiving the detection light reflected by the optical fiber, that is, the detection light emitted by the laser emitting assembly is transmitted into the optical fiber, the optical fiber reflects the detection light, the reflected detection light is transmitted to the detection receiving assembly, the detection receiving assembly receives the reflected light, and the received reflected light is detected and analyzed to determine whether a breakpoint occurs in the optical fiber. In the present example, it is shown that,

the transmission routes of the emitted light and the received light are different, namely, the light emitted by the laser emitting component and the light received by the detection receiving component are at a certain angle, and the emitted light and the received light are preferably perpendicular to each other.

In this example, the light emitting end 503 emits data light and detection light with the same wavelength, and the data light or the detection light is emitted at different time and carries different information; the wavelength of the data light received at the data light receiving end 501 is different from that of the data light received at the light transceiving integrated end 502, so that the transceiving integrated function of the optical module is realized, the OTDR function is added, and the detection light is received and integrated in the light emitting device.

In the example, the laser emitting assembly CAN comprise a single laser emitting chip, and CAN also comprise a laser emitting integrated assembly TO-CAN; the light conducting component may be an optical waveguide or an optical fiber core component.

Fig. 6 is an exploded schematic structural diagram of an optical transceiver module in an optical module having an OTDR function according to an embodiment of the present application; fig. 7 is a cross-sectional view of an optical transceiver module in an optical module with an OTDR function according to an embodiment of the present application. As shown in fig. 6 and 7, in order to realize single-fiber bidirectional and same-wavelength transmission of the optical transceiver module 50, the optical combiner 80 is disposed in the housing 505, and the optical combiner 80 has 1 incident light surface, 1 transceiver light surface, and 1 emergent light surface, so that optical signals can only be transmitted sequentially along the specified light surfaces, and thus, the optical combiner is used for separating forward-transmitted optical signals and backward-transmitted optical signals in the same optical fiber, and reducing crosstalk of the transmitted light to the received reflected light.

The data light or the detection light emitted by the light emitting end 503 enters the optical splitting and combining device 80 through the light incident surface, and then the data light or the detection light is emitted from the optical splitting and combining device 80 through the light receiving and transmitting surface and enters the optical fiber connected with the optical receiving and transmitting integrated end 502, the data light is transmitted through the optical fiber, and the detection light performs breakpoint detection on the optical fiber. The detection light is reflected in the optical fiber, and the reflected detection light enters the optical combiner 80 through the light-transmitting/receiving surfaces, and then the reflected light is emitted from the optical combiner 80 through the light-emitting surface and enters the detection light-receiving end 504.

Fig. 8 is a schematic diagram of structural position distribution of optical transceiver components in an optical module with an OTDR function provided in the embodiment of the present application, fig. 9 is a schematic diagram of a structure of an optical add/drop device in an optical module with an OTDR function provided in the embodiment of the present application, and fig. 10 is a schematic diagram of an exploded structure of an optical add/drop device in an optical module with an OTDR function provided in the embodiment of the present application. As shown in fig. 8, 9 and 10, the light splitting device 80 disposed in the housing 505 is composed of a first polarization beam splitting prism assembly 803, a faraday rotator 804, a half-wave plate 805 and a second polarization beam splitting prism assembly 806, the faraday rotator 804 is embedded in a U-shaped magnetic block 807, the first polarization beam splitting prism assembly 803, the U-shaped magnetic block 807, the half-wave plate 805 and the second polarization beam splitting prism assembly 806 can be glued with each other, and the first polarization beam splitting prism assembly 803, the U-shaped magnetic block 807, the half-wave plate 805 and the second polarization beam splitting prism assembly 806 are respectively mounted in the housing 505 through bottom surfaces thereof. There may also be a gap between the first polarization splitting prism assembly 803, faraday rotator 804, half wave plate 805 and second polarization splitting prism assembly 806, mounted through their bottom surfaces in housing 505.

The Faraday rotator 804 changes the polarization direction of light under the action of a magnetic field, the magnetic block is used for providing the magnetic field required by the Faraday rotator, and the magnetic block for providing the magnetic field can be U-shaped or in other shapes.

In this example, the light incident surface of the light splitting device 80 is the light receiving surface of the first polarization beam splitting prism assembly 803, the light receiving and transmitting surface of the light splitting device 80 is the light emitting and receiving surface of the second polarization beam splitting prism assembly 806 (the light emitting and receiving surface of the second polarization beam splitting prism assembly 806 are the same surface), and the light emitting surface of the light splitting device 80 is the reflected light emitting surface of the first polarization beam splitting prism assembly 803.

The first polarization splitting prism assembly 803 may be formed by combining a first polarization splitting prism 8031 and a second polarization splitting prism 8032, the first polarization splitting prism 8031 is located in the light outgoing direction of the light emission end 503, the optical axis of the second polarization splitting prism 8032 is parallel to the first polarization splitting prism 8031, that is, the data light or the detection light emitted by the light emission end 503 enters the first polarization splitting prism 8031 through the light incoming surface of the first polarization splitting prism 8031 (the light incoming surface is the light receiving surface of the first polarization splitting prism 8031), and the first polarization splitting prism 8031 splits the data light or the detection light.

The second polarization splitting prism assembly 806 can be formed by combining a third polarization splitting prism 8061 and a fourth polarization splitting prism 8062, the third polarization splitting prism 8061 is located in the light incident direction of the light transceiving integrated body end 502, the optical axis of the fourth polarization splitting prism 8062 is parallel to the optical axis of the third polarization splitting prism 8061, that is, the data light or the detection light emitted by the light emitting end 503 enters the first polarization splitting prism 8031 for splitting, then the data light or the detection light sequentially passes through the faraday rotator 804, the half wave plate 805 and the second polarization splitting prism assembly 806, is combined by the third polarization splitting prism 8061, and is emitted from the light emitting surface of the third polarization splitting prism 8061 after being combined, and enters the optical fiber at the light transceiving integrated body end 502.

The data light is transmitted in the optical fiber, the detection light is reflected in the optical fiber, the reflected detection light sequentially passes through the second polarization beam splitting prism assembly 806, the half-wave plate 805, the faraday rotator 804 and the first polarization beam splitting prism assembly 803, and the reflected light is emitted from the light emitting surface of the first polarization beam splitting prism 8031 and enters the detection light receiving end 504.

In this example, the first polarization splitting prism 8031 and the fourth polarization splitting prism 8062 are coaxially disposed, and the second polarization splitting prism 8032 and the third polarization splitting prism 8061 are coaxially disposed, so as to implement polarization splitting and polarization combining of light.

The first polarization splitting prism assembly 803 and the second polarization splitting prism assembly 806 may also be formed by combining a polarization splitting prism for splitting incident light into P-polarized light and S-polarized light and a high reflector for reflecting the P-polarized light or S-polarized light to realize light splitting and combining.

The light incident surface of the polarization beam splitter prism is provided with a polarization beam splitting film for splitting incident unpolarized light into two beams of vertical linear polarized light, namely P polarized light and S polarized light. The faraday rotator 804 can rotate the polarization direction of light passing through it clockwise or clockwise (preferably 45 °) in the light propagation direction by the magnetic field applied by the U-shaped magnetic block 807, that is, the U-shaped magnetic block 807 applies an external magnetic field to the faraday rotator 804, and the faraday rotator 804 rotates P-polarized light and S-polarized light clockwise (preferably 45 °) in the forward direction and counterclockwise (preferably 45 °) in the reverse direction by the external magnetic field, and the light propagation direction is not changed. The half-wave plate 805 rotates the light clockwise (preferably by 45 °) when the light passes in the forward direction or the reverse direction, that is, when the light travels from the faraday rotator 804 toward the half-wave plate 805, the P-polarized light and the S-polarized light after the light is rotated clockwise (preferably by 45 °) continue to rotate clockwise (preferably by 45 °) so that the polarization directions of the P-polarized light after the light is rotated and the P-polarized light before the light is not rotated are perpendicular to each other, the P-polarized light is converted into the S-polarized light, the polarization directions of the S-polarized light after the light is rotated and the S-polarized light before the light is not rotated are perpendicular to each; when light is transmitted from the half-wave plate 805 to the faraday rotator, P-polarized light and S-polarized light pass through the half-wave plate 805 and then rotate clockwise (preferably rotate 45 °), then the rotated P-polarized light and S-polarized light enter the faraday rotator 804, the faraday rotator 804 rotates the rotated P-polarized light and S-polarized light counterclockwise (preferably rotate 45 °) under the action of an applied magnetic field, so that the polarization direction of the P-polarized light after passing through the half-wave plate 805 and the faraday rotator 804 is unchanged and remains P-polarized light, and the polarization direction of the S-polarized light after passing through the half-wave plate 805 and the faraday rotator 804 is unchanged and remains S-polarized light.

Fig. 11 is a data light or detection light transmission route map in the optical module with an OTDR function provided in this embodiment, and fig. 12 is a detection light transmission route map reflected in the optical module with an OTDR function provided in this embodiment.

As shown in fig. 11, the data light or the detection light emitted from the light emitting end 503 enters the first polarization splitting prism assembly 803 through the light incident surface of the first polarization splitting prism 8031, the first polarization splitting prism 8031 splits the data light or the detection light into P-polarized light and S-polarized light, the P-polarized light transmits through the first polarization splitting prism 8031, the S-polarized light is reflected at the first polarization splitting prism 8031 at a certain angle (preferably, 45 °), and the emission direction is different from the emission direction of the P-polarized light (preferably, the emission direction of the S-polarized light forms an angle of 90 °); then, the P polarized light sequentially enters the faraday rotator 804 and the half-wave plate 805, the P polarized light is converted into S polarized light after passing through the faraday rotator 804 and the half-wave plate 805, the reflected S polarized light enters the second polarization splitting prism 8032, and is reflected again at a certain angle (preferably, 45 °) at the second polarization splitting prism 8032, the outgoing direction is parallel to the P polarized light, the S polarized light after being reflected again sequentially enters the faraday rotator 804 and the half-wave plate 805, and the S polarized light is converted into the P polarized light; the converted S polarized light emitted from the half-wave plate 805 enters the second polarization splitting prism assembly 806, and is reflected at an angle (preferably, 45 °) perpendicular to the P polarized light at the fourth polarization splitting prism 8062; the converted P-polarized light emitted from the half-wave plate 805 enters the third polarization splitting prism 8061, and is combined with the reflected converted S-polarized light at the third polarization splitting prism 8061, and the combined data light or detection light enters the light transceiving integrated end 502. That is, the data light or the detection light emitted from the light emitting end 503 enters the optical transceiver integrated end 502 via the polarization beam splitter and the polarization beam combiner, and enters the optical fiber.

In this example, a polarization splitting film is provided on a side of the third polarization splitting prism 8061 facing the light transceiving integrated body end 502, a P light reflecting film is provided on a side of the second polarization splitting prism 8032 facing the third polarization splitting prism 8061, and an S light reflecting film is provided on a side of the first polarization splitting prism 8031 facing the third polarization splitting prism 8061, as shown in fig. 12, the detection light reflected in the optical fiber enters the third polarization splitting prism 8061, the third polarization splitting prism 8061 splits the reflection light to split the reflection light into P polarized light and S polarized light, the P polarized light transmits through the third polarization splitting prism 8061, and the S polarized light is reflected at the third polarization splitting prism 8061 at a certain angle (preferably, an angle of 45 °), and the emission direction of the P polarized light is different from the emission direction of the P polarized light (preferably, the emission direction of the S polarized light forms an angle of 90 ° with the emission direction of the P polarized light); then the P polarized light enters the half wave plate 805 and the faraday rotator 804 in sequence, the polarization direction of the P polarized light is unchanged and is still the P polarized light, the reflected S polarized light enters the fourth polarization beam splitter 8062, the S polarized light is reflected at the fourth polarization beam splitter 8062 again at a certain angle (preferably 45 °), the emergent direction is parallel to the P polarized light, and the S polarized light after being reflected again enters the half wave plate 805 and the faraday rotator 804 in sequence, the polarization direction of the S polarized light is unchanged and is still the S polarized light; the P-polarized light emitted from the faraday rotator 804 enters the second polarization splitting prism 8032, and due to the P-light reflecting film arranged at the second polarization splitting prism 8032, the P-polarized light is reflected at the second polarization splitting prism 8032 at a certain angle (preferably 45 °), and the emission direction of the reflected P-polarized light is perpendicular to the P-polarized light; the S-polarized light emitted from the faraday rotator 804 enters the first polarization splitting prism 8031, and since the first polarization splitting prism 8031 is provided with the S-light reflecting film, the S-polarized light is reflected at the first polarization splitting prism 8031 at a certain angle (preferably 45 °), the S-polarized light after reflection and the P-polarized light after reflection are combined at the first polarization splitting prism 8031, and the combined reflected light enters the detection light receiving end 504.

The light filter 810 is disposed on the light-emitting surface of the reflected light of the first polarization splitting prism 8031, and the light filter 810 filters the incident reflected light, that is, light with a specific wavelength is allowed to pass through the light filter 810, so that interference light is prevented from entering the detection light receiving end 504. In this example, the filter 810 is a 0 ° filter.

The light splitting device 80 further includes a first lens component 802 and a second lens component 808, a light incident surface of the first lens component 802 corresponds to the light emitting end 503, and a light emitting surface of the first lens component 802 corresponds to a light incident surface of the first polarization beam splitting prism component 803, that is, the light emitting end 503, the first lens component 802 and the first polarization beam splitting prism 8031 are coaxially disposed. The light incident surface of the second lens component 808 corresponds to the integrated optical transceiver end 502, that is, the integrated optical transceiver end 502, the second lens component 808 and the third polarization beam splitter prism 8061 are coaxially disposed.

The data light or the detection light emitted from the light emitting end 503 enters the first lens assembly 802, and the data light or the detection light may be divergent light, convergent light or parallel light, if the data light or the detection light is divergent light or convergent light, after the data light or the detection light enters the first lens assembly 802, the first lens assembly 802 converts the divergent light or the convergent light into parallel light, and the converted parallel light enters the first polarization beam splitting prism assembly 803. Similarly, the light reflected by the optical fiber enters the second lens assembly 808, the second lens assembly 808 converts the reflected light into parallel light, and the converted parallel light enters the second polarization beam splitting prism assembly 806.

The optical combiner 80 further includes a bracket 801, and the first lens assembly 802, the first polarization beam splitting prism assembly 803, the U-shaped magnetic block 807, the half-wave plate 805, the second polarization beam splitting prism assembly 806 and the second lens assembly 808 are all mounted on the bracket 801. The first limiting groove 8011 and the second limiting groove 8012 are arranged on the bracket 801, and a height difference is provided between the first limiting groove 8011 and the second limiting groove 8012, the first lens assembly 802, the first polarization beam splitting prism assembly 803, the U-shaped magnetic block 807, the half-wave plate 805 and the second polarization beam splitting prism assembly 806 are installed on the bracket 801 through the first limiting groove 8011, and the second lens assembly 808 is installed on the bracket 801 through the second limiting groove 8012. The bottom surface of the first position-limiting groove 8011 is in contact with the bottom surface of the first lens component 802, the bottom surface of the first polarization beam splitting prism assembly 803, the bottom surface of the U-shaped magnetic block 807, and the bottom surface of the half-wave plate 805 is in contact with the bottom surface of the second polarization beam splitting prism assembly 806, and the bottom surfaces of the first lens component 802, the first polarization beam splitting prism assembly 803, the U-shaped magnetic block 807, the half-wave plate 805, and the second polarization beam splitting prism assembly 806 may be respectively bonded to the bottom surface of the first position-limiting groove 8011 by glue, so that the first lens component 802, the first polarization beam splitting prism assembly 803, the U-shaped magnetic block 807, the half-wave plate 805, and the second polarization beam splitting prism assembly 806 are fixed on the bracket 801. The first lens assembly 802, the first polarization beam splitting prism assembly 803, the U-shaped magnetic block 807, the half wave plate 805 and the second polarization beam splitting prism assembly 806 can also be fixed on the bracket 801 by a metal solder eutectic technology or a laser welding technology.

When the first lens component 802 is fixed by glue, it may be a metal structure, or a glass structure or other structures that are convenient for supporting and fixing various materials.

Because the first polarization beam splitting prism assembly 803 performs polarization beam splitting on data light or detection light, and the second polarization beam splitting prism assembly 806 performs polarization beam combining on the data light or the detection light, a height difference exists between light emitted by the first lens assembly 802 and light incident by the second lens assembly 808, so that the bottom surface of the second limiting groove 8012 is lower than the bottom surface of the first limiting groove 8011, the bottom surface of the second lens assembly 808 is in contact with the bottom surface of the second limiting groove 8012, and the bottom surface of the second lens assembly 808 and the bottom surface of the second limiting groove 8012 can be bonded by glue, so that the second lens assembly 808 is fixed on the bracket 801. Second lens assembly 808 may also be secured to bracket 801 by a metal solder eutectic technique or a laser welding technique.

When the second lens component 808 is fixed by glue, it may be a metal structure, or a glass structure or other structures that are convenient for supporting and fixing various materials.

The bracket 801 is further provided with a third limiting groove 8013, and the optical filter 810 is mounted on the bracket 801 through the third limiting groove 8013. The bottom surface of the third position-limiting groove 8013 is lower than the bottom surface of the first position-limiting groove 8011, the bottom surface of the third position-limiting groove 8013 contacts the bottom surface of the optical filter 810, the side surface adjacent to the bottom surface limits the side surface of the optical filter 810, and then the bottom surface of the optical filter 810 is bonded to the bottom surface of the third position-limiting groove 8013 by glue, so that the optical filter 810 is fixed on the bracket 801.

The first position-limiting groove 8011, the second position-limiting groove 8012 and the third position-limiting groove 8013 are not limited to a square groove, but may also be a circular groove, a convex groove or other irregular groove or convex groove shapes, as long as they can perform a mechanical positioning function on the first lens component 802, the first polarization beam splitting prism component 803, the U-shaped magnetic block 807, the half-wave plate 805, the second polarization beam splitting prism component 806 and the second lens component 808, and they all belong to the protection scope of the embodiment of the present application.

The first lens element 802 and the second lens element 808 can be mounted in a limited manner by an optical image recognition technique, a light spot imaging technique, or a light beam coupling technique, in addition to the first limiting groove 8011 and the second limiting groove 8012. When the first lens assembly 802 is installed, it is to be ensured that the center of the optical lens of the first lens assembly 802 coincides with the emergent center of the laser emission assembly, and when the mechanical limit structure is adopted to limit the first lens assembly 802, processing errors are likely to occur to cause the first lens assembly 802 and the laser emission assembly not to coincide with each other, but an optical image recognition technology or a light spot imaging technology or a light beam coupling technology is adopted to ensure that the incident center of the optical lens of the first lens assembly coincides with the emergent center of the laser emission assembly, so that the accurate installation of the first lens assembly 802 is ensured.

Similarly, when the second lens component 808 is mounted, the optical image recognition technology, the light spot imaging technology, or the light beam coupling technology is adopted, so that the emergent center of the optical lens of the second lens component 808 can be ensured to coincide with the incident center of the light transceiving integrated terminal, and the accurate mounting of the second lens component 808 is ensured.

The position-limiting structure on the bracket 801 may also be adjusted to a non-contact structure with a small gap, that is, the position between the two side surfaces of the groove in the first position-limiting groove 8011 and the first lens assembly 802 is limited by a non-tight structure, and the first lens assembly 802 is accurately assembled with high precision by an optical projection recognition technology or a light spot coupling technology. That is to say, a groove is formed in the bracket 801, the first lens assembly 802 is placed in the groove, the first lens assembly 802 is moved by an optical projection recognition technology or a light spot coupling technology, so that an incident center of an optical lens of the first lens assembly coincides with an emergent center of the laser emission assembly, then the first lens assembly 802 is pasted in the groove, at this time, the side surface of the first lens assembly 802 is not in contact with the side surface of the groove, and then the first polarization beam splitting prism assembly 803, the U-shaped magnetic block 807, the half-wave plate 805 and the second polarization beam splitting prism assembly 806 are accurately assembled according to the first lens assembly 802.

Similarly, a groove is formed in the bracket 801, the second lens assembly 808 is placed in the groove, the second lens assembly 808 is moved through an optical identification technology or a light spot coupling technology, so that the emergent center of the optical lens of the second lens assembly 808 coincides with the incident center of the optical transceiver integrated end 502, then the second lens assembly 808 is pasted in the groove, and at the moment, the side surface of the second lens assembly 808 is not in contact with the side surface of the groove, so that the high-precision and accurate assembly of the second lens assembly 808 is realized.

After the lens assembly and the support are positioned and installed with high precision by adopting an optical image recognition technology or a light spot imaging technology or a light beam coupling technology, the lens assembly can be fixed on the surface of the support by sticking glue, and the thickness of a glue layer between the lens assembly and the surface of the support is less than or equal to 15 micrometers.

The installation between lens subassembly and the support except that above-mentioned glue is fixed, can also adopt laser welding's mode to fix, specifically, can design 2 indent structures on support 801 one side, these 2 indent structures and first lens subassembly 802, the perpendicular thickness of second lens subassembly 808 are 0.3mm, and first lens subassembly 802, second lens subassembly 808 and support 801 are connected through laser electric welding, and the electric welding mode is 2 rows multiseriate modes.

In order to ensure that the first lens component 802 and the second lens component 808 are fixedly mounted, the first lens component 802, the second lens component 808 and the bracket 801 may be combined to form an integral molding, that is, the bracket 801 has 2 boss structures for placing the optical lenses of the first lens component 802 and the optical lenses of the second lens component 808, and then the optical lenses of the first lens component 802 and the optical lenses of the second lens component 808 are respectively mounted on the two boss structures of the bracket 801 by using a mechanical positioning or optical image recognition technology, a light spot imaging technology, or a light beam coupling technology, and may be adhered by using glue or may be spot welded by using laser.

In this example, the optical lenses of the first lens component 802 and the optical lenses of the second lens component 808 have a function of converting a converging light beam and a collimating light beam, and may include various spherical or aspherical glass or plastic lenses with gradually changed non-refractive indexes, and may also include a lens with gradually changed refractive indexes, so as to convert a detection light beam emitted by the laser emitting component into a parallel light beam and convert a light beam reflected by the optical fiber into a parallel light beam.

In this example, the third lens assembly 90 may be disposed between the detection light receiving end 504 and the detection receiving assembly, the third lens assembly 90 is fixedly mounted on the bracket 801 in the same mounting manner as the first lens assembly 802 and the second lens assembly 808, the reflected light emitted by the first polarization splitting prism assembly 803 enters the third lens assembly 90, the third lens assembly 90 converts the emitted collimated light into convergent light, and then the convergent light is received by the detection receiving assembly.

The first lens assembly 802, the first polarization beam splitting prism assembly 803, the U-shaped magnetic block 807, the half wave plate 805, the second polarization beam splitting prism assembly 806, and the second lens assembly 808 are all installed in the cavity of the housing 505, as shown in fig. 13 and 14, a lateral cover hole is formed in a side face 5051 of the housing 505, and the housing 505 is communicated with the outside through the lateral cover hole; a movable end cover is arranged at a lateral cover hole of the casing 505, and during assembly, the movable end cover can be opened, and the first lens assembly 802, the first polarization beam splitting prism assembly 803, the faraday rotator 804, the U-shaped magnetic block 807, the half wave plate 805, the second polarization beam splitting prism assembly 806, the second lens assembly 808 and the like are installed in the casing 505.

The housing 505 is provided with an optical transceiver integrated end face 5052, an optical incident end face 5053 and an optical receiving end face 5054, the optical transceiver integrated end face 5052, the optical incident end face 5053 and the optical receiving end face 5054 are all adjacent to the side face 5051, the light emitting end 503 is connected with the housing 505 through the optical incident end face 5053, the optical transceiver integrated end face 502 is connected with the housing 505 through the optical transceiver integrated end face 5052, and the detection light receiving end 504 is connected with the housing 505 through the optical receiving end face 5054. An incident light hole is formed in the light incident end surface 5053, and data light or detection light emitted by the light emitting end 503 enters the optical splitting and combining device 80 through the incident light hole; the optical transceiver integrated end face 5052 is provided with an optical transceiver integrated optical aperture through which light emitted from the optical splitter 80 enters the optical transceiver integrated end 502; the light receiving end face 5054 is provided with a light receiving hole, and the reflected light emitted from the light splitting device 80 enters the detection light receiving end 504 through the light receiving hole.

An avoidance end face 5055 inclined downward is provided between the light receiving end face 5054 and the light transmitting and receiving integrated end face 5052, and the avoidance end face 5055 is close to the data light receiving end 501 and is used for avoiding the data light receiving end 501 of the optical module. In the optical module provided in this example, the data optical receiving end 501 and the optical transceiver integrated end 502 are located on the same side, and are separated by a predetermined distance. A distance requirement exists between the optical fiber interface connected with the data optical receiving end 501 and the optical fiber interface connected with the optical transceiver integrated end 502, so that the distance requirement also exists between the data optical receiving end 501 and the optical transceiver integrated end 502 in the optical module, and a preset distance is required to be met, so that an avoidance end face 5055 is arranged on the shell 505 to meet the protocol requirement of the optical module.

The avoidance end face 5055 includes a first end face 101, a second end face 102 and a third end face 103, one end of the first end face 101 is connected with the light receiving end face 5054, the other end of the first end face is connected with one end of the second end face 102, the other end of the second end face 102 is connected with one end of the third end face 103, the other end of the third end face 103 is connected with the light transceiving integrated end face 5052, the inclination of the first end face 101 is greater than that of the second end face 102, and the third end face 103 is perpendicular to the light transceiving integrated end face 5052, so that the data light receiving end 501 is avoided to the greatest extent.

In order to avoid the data light receiving end 501, the detection light receiving end 504 is arranged on the side of the avoiding end face 5055 far away from the data light receiving end 501, that is, the light receiving hole on the light receiving end face 5054 is relatively shifted to the left, a shift prism 809 is arranged between the light receiving hole and the light-emitting surface of the reflected light of the first polarization splitting prism assembly 803, the light from the light receiving and transmitting integrated end 502 is emitted out through the light splitting device 80, and the light emitted from the light splitting device 80 enters one end of the shift prism 809 and is emitted to the detection light receiving end 504 through the other end of the shift prism 809.

The optical filter 810 is located between the first polarization splitting prism 8031 and the displacement prism 809, the reflected light emitted from the first polarization splitting prism 8031 enters the optical filter 810, the optical filter filters the incident reflected light, the filtered reflected light enters one end of the displacement prism 809, and the reflected light passes through the other end of the displacement prism 809 and is emitted to the detection light receiving end 504.

A first positioning slot 5056 and a second positioning slot 5057 are disposed in the cavity of the housing 505, the first positioning slot 5056 includes a first side surface 104, a first bottom surface 105 and a second side surface 106, the second positioning slot 5057 includes a first side surface 104, a second bottom surface 108 and a third side surface 107, the first bottom surface 105 is lower than the second bottom surface 108, and a top end of the first side surface 104 and the second bottom surface 108 are located in the same plane. As shown in fig. 15 and 16, the bracket 801 is installed in the housing 505 through the first positioning slot 5056, the bottom surface of the bracket 801 contacts with the first bottom surface 105, and the first side surface 104 and the second side surface 106 contact with the two side surfaces of the bracket 801 to limit the bracket 801; the bottom surface of the bracket 801 may be adhered to the first bottom surface 105 to fix the bracket 801.

When the bracket 801 is installed, it is required to ensure that an incident light hole on the light incident end face 5053 is coaxially arranged with the first lens component 802 on the bracket 801, and a light receiving and transmitting integrated light hole on the light receiving and transmitting integrated end face 5052 is coaxially arranged with the second lens component 808 on the bracket 801.

In this example, the displacement prism 809 may be a parallelogram displacement prism, the displacement prism 809 is installed in the housing 505 through the second positioning groove 5057, the bottom surface of the displacement prism 809 contacts with the second bottom surface 108, the light emitting surface of the displacement prism 809 abuts against the third side surface 107, and the third side surface 107 is an inner side surface of the light receiving end surface 5054.

The second bottom surface 108 is provided with a boss 5058 adjacent to the receiving hole, the boss 5058 includes a fourth side surface 109 and a fifth side surface 110, and the fourth side surface 109 and the first side surface 104 are located in the same plane. The displacement prism 809 comprises a sixth side surface 111, the sixth side surface 111 is respectively connected with the light incident surface and the light emitting surface of the displacement prism 809, the sixth side surface 111 is an inclined surface, the fifth side surface 110 of the boss 5058 is an inclined surface, and the fifth side surface 110 is abutted against the sixth side surface 111, so that the displacement prism 809 is positioned; the bottom surface of the displacement prism 809 can be adhered to the second bottom surface 108, and the displacement prism 809 is clamped by the third side surface 107 and the boss 5058, so that the displacement prism 809 is fixed.

The displacement prism 809 can also be fixed by glue bonding, specifically, glue is coated between the second positioning groove 5057 and the displacement prism 809, the displacement prism 809 is directly bonded on the surface of the second positioning groove 5057, and in order to avoid the random flow of the glue, a glue collecting groove can be formed on the surface of the second positioning groove 5057.

The first lens assembly 802, the U-shaped magnetic block 807 and the second lens assembly 808 can be mounted on the bracket 801, and then the assembled bracket 801 is inserted into the first positioning groove 5056 of the housing 505. Or the first lens component 802, the first polarization beam splitting prism component 803, the U-shaped magnetic block 807, the half-wave plate 805, the second polarization beam splitting prism component 806 and the second lens component 808 may be directly installed in the housing 505, that is, two positioning slots are sequentially arranged in the cavity of the housing 505, the first lens component 802 and the second lens component 808 are respectively installed in the housing 505 through the positioning slots, because the first polarization beam splitting prism component 803 performs polarization beam splitting on data light or detection light, and the second polarization beam splitting prism component 806 performs polarization beam combination on the data light or detection light, so that there is a height difference between light emitted from the first lens component 802 and light incident from the second lens component 808, and therefore the positioning slot for installing the first lens component 802 is higher than the positioning slot of the second lens component 808, it is required to ensure that the first lens component 802 and the incident light hole of the light incident end face 5053 are coaxially arranged, and the first lens component 802 and the first polarization beam splitting prism component 803, the second polarization beam splitting prism assembly 806 is coaxially disposed with the second lens assembly 808, and the second lens assembly 808 is coaxially disposed with the integrated optical transceiver aperture of the integrated optical transceiver end face 5052.

After the first lens assembly 802 and the second lens assembly 808 are positioned by the positioning groove, the bottom surface of the first lens assembly 802 may be bonded to the bottom surface of the positioning groove, and the bottom surface of the second lens assembly 808 may be bonded to the bottom surface of the positioning groove.

The positioning manner of the shift prism 809 is the same as the above embodiment, and is not described herein again.

The manner in which the first lens assembly 802, the first polarization beam splitting prism assembly 803, the U-shaped magnetic block 807, the half wave plate 805, the second polarization beam splitting prism assembly 806, and the second lens assembly 808 are installed in the housing 505 is not limited to the positioning manner described in the above embodiments, and the method as long as the polarization beam splitting and polarization beam combining effect can be achieved belongs to the protection scope of the embodiments of the present application.

Fig. 17 is a schematic structural diagram of another optical transceiver module according to an embodiment of the present application. As shown in fig. 12, after the light reflected by the optical fiber is split by the second polarization beam splitter prism assembly 806, the light path of the S-polarized light entering the first polarization beam splitter prism assembly 803 is consistent with the data light or detection light emitting light path of the first lens assembly 802, and there is a possibility that the reflected light enters the laser emitting assembly along the data light or detection light emitting light path, which affects the emission performance of the laser emitting assembly. In this example, in order to solve this problem, as shown in fig. 17, connection surfaces of the first polarization splitting prism assembly 803, the U-shaped magnetic block 807, the half-wave plate 805, and the second polarization splitting prism assembly 806, which are in contact with the support 801, are set as inclined surfaces, that is, a bottom surface of the first position-limiting groove 8011 is set to form a certain included angle α with a horizontal axis, and the first polarization splitting prism assembly 803, the U-shaped magnetic block 807, the half-wave plate 805, and the second polarization splitting prism assembly 806 are attached to the inclined bottom surfaces, so that an outgoing light path of the laser emission assembly is not consistent with an incident light path of reflected light in the first polarization splitting prism, and the reflected light cannot enter the laser emission assembly, thereby achieving an anti-reflection performance of the laser emission assembly.

The optical module with OTDR function provided in the embodiment of this application is provided with an optical transceiver module, which is composed of a laser transmitter module, a first lens module, a first polarization splitting prism, a faraday rotator, a half-wave plate, a second lens module, a magnetic block, an optical transmission module, a detection receiver module, etc., wherein the laser transmitter module is used to transmit data light and detection light, the transmitted data light or detection light enters the first lens module, is calibrated to be collimated light by the first lens module, the collimated light enters the first polarization splitting prism for splitting, then passes through the faraday rotator, the half-wave plate and the second polarization splitting prism in sequence, light is combined in the second polarization splitting prism, the collimated light after combining enters the optical transmission module through the second lens module, is transmitted into an optical fiber through the optical transmission module, the data light is transmitted out through the optical fiber, and the detection light is reflected in the optical fiber, the reflected detection light enters the second lens assembly, is collimated into collimated light by the second lens assembly, enters the second polarization beam splitter prism for splitting, then sequentially passes through the half-wave plate, the Faraday rotating plate and the first polarization beam splitter prism, is combined in the first polarization beam splitter prism, and enters the detection receiving assembly, so that the received reflected light is analyzed, and whether a breakpoint exists in the optical fiber is judged. The optical module realizes the separation of data light and reflected light through the polarization beam splitter prism, the Faraday rotator plate and the half-wave plate, reduces the crosstalk of the data light to the reflected light, shortens the attenuation blind area of the OTDR, more clearly measures the light reflected by the optical fiber and greatly improves the OTDR light receiving performance.

It should be noted that, in the present specification, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a circuit structure, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such circuit structure, article, or apparatus. Without further limitation, the presence of an element identified by the phrase "comprising an … …" does not exclude the presence of other like elements in a circuit structure, article or device comprising the element.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

The above-described embodiments of the present application do not limit the scope of the present application.

Claims

1. An optical module with OTDR function, which comprises a circuit board and an optical transceiver component electrically connected with the circuit board, wherein,

2. The optical module of claim 1, wherein the first polarization beam splitter prism assembly comprises a first polarization beam splitter prism and a second polarization beam splitter prism, and the first polarization beam splitter prism is located in the light outgoing direction of the light emitting end;

the light incident surface of the first polarization beam splitter prism is provided with a polarization beam splitting film, and the light emergent surface of the first polarization beam splitter prism is provided with a reflecting film; and a reflecting film is arranged on the light incident surface of the second polarization splitting prism.

3. The optical module of claim 1, wherein the first polarization beam splitter prism assembly comprises a first polarization beam splitter prism and a first reflector, and the first polarization beam splitter prism is located in the light outgoing direction of the light emitting end; the light incident surface of the first polarization beam splitter prism is provided with a polarization beam splitting film, and the light emergent surface of the first polarization beam splitter prism is provided with a reflecting film;

the optical axis of the first polarization beam splitter prism is parallel to the optical axis of the first reflector.

4. The optical transceiver of claim 2, wherein the second polarization beam splitter prism assembly comprises a third polarization beam splitter prism and a fourth polarization beam splitter prism, and the third polarization beam splitter prism is located in the light incident direction of the optical transceiver integrated terminal;

the first polarization beam splitter prism and the fourth polarization beam splitter prism are coaxially arranged, and the second polarization beam splitter prism and the third polarization beam splitter prism are coaxially arranged.

5. The optical module as claimed in claim 3, wherein the second polarization beam splitter prism assembly comprises a third polarization beam splitter prism and a second reflecting mirror, the third polarization beam splitter prism is located in the light incident direction of the optical transceiver integrated end;

the first polarization beam splitter prism and the second reflection mirror are coaxially arranged, and the first reflection mirror and the third polarization beam splitter prism are coaxially arranged.

6. The optical module according to any one of claims 1 to 5, wherein a first lens assembly and a second lens assembly are further disposed in the housing, the light exit surface of the first lens assembly is close to the light entrance surface of the first polarization splitting prism, and the light entrance surface of the second lens assembly is close to the light exit surface of the third polarization splitting prism;

the first lens assembly and the first polarization beam splitter prism are coaxially arranged, and the second lens assembly and the third polarization beam splitter prism are coaxially arranged.

7. The optical module of claim 6, wherein a bracket is further disposed in the housing, positioning grooves with different heights are disposed on the bracket, and the first lens assembly, the magnetic block, and the second lens assembly are respectively fixed to the bracket through the positioning grooves.

8. The light module of claim 7, wherein the first lens assembly, the second lens assembly and the bracket are a unitary structure.

9. The optical module as claimed in claim 7, wherein a bottom surface of the positioning groove of the bracket contacting the magnetic block is an inclined surface, and the magnetic block is mounted on the inclined surface.

10. The optical module according to claim 1, wherein the light emitting direction of the light emitting end is perpendicular to the light entering direction of the detection light receiving end.