CN110927895A

CN110927895A - BIDI device, optical module and production method

Info

Publication number: CN110927895A
Application number: CN201911087898.XA
Authority: CN
Inventors: 梅雪; 刘成刚; 曹俊红
Original assignee: Accelink Technologies Co Ltd
Current assignee: Accelink Technologies Co Ltd
Priority date: 2019-11-08
Filing date: 2019-11-08
Publication date: 2020-03-27
Also published as: WO2021088180A1

Abstract

The application discloses a BIDI device, an optical module and a production method, comprising a wavelength division multiplexer, a first optical device and a second optical device; one of the first optical device and the second optical device is an optical transmitter, and the other of the first optical device and the second optical device is an optical receiver; the wavelength division multiplexer comprises a first optical port, a second optical port, a third optical port, a first collimating unit and a filter; the first collimating unit is arranged on one side of the filter, which is far away from the first light port, and the filter can receive parallel light from the first lens unit; the first optical port is fixedly coupled with the first optical device, the second optical port is connected with the optical path of the second optical device, the third optical port is used for receiving external light or emitting light, and the plane normal of the filter and the optical axis included angle A of the parallel light are smaller than or equal to 5 degrees. The BIDI device, the optical module and the production method have the advantages of small size and high wavelength division density.

Description

BIDI device, optical module and production method

Technical Field

The present application relates to the field of optical communications, and in particular, to a BIDI device, an optical module, and a method for manufacturing the optical module.

Background

In the prior art, a pigtailed optical transceiver (hereinafter abbreviated as a BIDI device) needs an add-on wavelength division multiplexer (hereinafter abbreviated as a WDM component), as shown in fig. 1, 3 optical fibers 110 ' are respectively led out from two sides of the WDM component 100 ' to connect with an optical transmitter 200 ', an optical receiver 300 ', and ports 190 ', and the 3 optical fibers 110 ' are processed in the WDM component 100 ' by adopting a fused biconical taper process, and matching is needed among the optical fibers 110 ', so that a longer biconical taper region is needed, and further, the WDM component 100 ' needs a longer length to meet process requirements; in addition, the bending diameter of the optical fiber 110 ' is limited, and in the prior art, the minimum bending diameter of the optical fiber is 10mm, while the WDM assembly 100 ' leads out the optical fiber 110 ' from both sides, so that a relatively independent fiber winding space is formed on both sides, resulting in a large volume.

Due to the large size, the BIDI device in the tail fiber type cannot keep up with the development of the module size. It is difficult to fit into a QSFP28 (i.e., a four-channel SFP interface, 28 family) or smaller volume optical module. In order to reduce the volume, manufacturers develop plug-in BIDI devices, one of which needs to be coupled with a plurality of devices at the same time and has low yield, and the other plug-in BIDI device generally adopts a coaxial packaging form of 45-degree filter plate light splitting and converging lens incidence; the wavelength division wavelength interval of the plug-in BIDI is large due to the self structure and the incidence mode, and the requirement of the wavelength division wavelength interval density degree of a high-capacity and high-speed wavelength division device cannot be met.

Therefore, in the 4G communication era, manufacturers prefer to make a single optical Transmitter (TOSA) and a single optical Receiver (ROSA), and connect two optical ports to an optical fiber to transmit high-speed and large-capacity uplink and downlink data.

However, with the rapid development of the 5G technology, a 5G scene with a long distance and a large capacity puts a high demand on the time difference between the uplink and the downlink, for example, in a 5G mid-transmission and return-transmission scene of 40km, if separate TOSA and ROSA are used for transmission, the difference between the lengths of the uplink and the downlink optical fibers and the difference between the optical fibers themselves will cause the difference between the transmission time, dispersion and scattering, etc., thereby causing a bottleneck in the uplink and downlink transmission technology of the long-distance 5G scene.

Therefore, the research direction of manufacturers returns to the BIDI device again, the BIDI device has the functions of light receiving and light emitting, the problem of uplink and downlink time difference can be effectively solved, but the tail fiber type BIDI device is overlarge in size, and the wavelength division density of the plug-in type BIDI device is small, so that the development of the technology is still restricted.

Disclosure of Invention

In view of the above, embodiments of the present disclosure are directed to providing a BIDI device, an optical module and a manufacturing method thereof, so as to solve the problems of an excessive size and a low wavelength division density of the conventional BIDI device in long-distance transmission.

In order to achieve the above purpose, the technical solution of the embodiment of the present application is implemented as follows:

a BIDI device comprising a wavelength division multiplexer, a first optical device, and a second optical device; one of the first optical device and the second optical device is an optical transmitter, and the other of the first optical device and the second optical device is an optical receiver; the wavelength division multiplexer comprises a first optical port, a second optical port, a third optical port, a first collimating unit and a filter; the first collimating unit is arranged on one side of the filter, which is far away from the first light port, and the filter can receive parallel light from the first collimating unit; the first optical port is fixedly coupled with the first optical device, the second optical port is connected with the second optical device through an optical path, and the third optical port is used for receiving external light or emitting light; and an included angle A between the normal of the plane of the filter and the optical axis of the parallel light is less than or equal to 5 degrees.

Further, the first light device comprises a second collimating unit cooperating with the first collimating unit.

Further, the first collimating unit is a collimating lens; and/or the second collimating unit is a collimating lens.

Further, the wavelength division multiplexer includes a dual-core pin, the dual-core pin including a core body, a first optical fiber, a second optical fiber, a first channel through which the first optical fiber passes, and a second channel through which the second optical fiber passes; the core body is arranged on one side of the first collimating unit, which is far away from the filter; one side of the filter lens, which is far away from the core body, is the first light port; the end, away from the filter, of the first channel is the second optical port, the first end of the first optical fiber is aligned to the first collimating unit, the first optical fiber is arranged in the second optical port in a penetrating manner, and the wavelength division multiplexer is connected with the second optical device through the first optical fiber; one end of the second channel, which is far away from the filter, is the third light port, the first end of the second optical fiber is aligned to the first collimating unit, and the second optical fiber is arranged in the third light port in a penetrating manner.

Further, the second light port and the third light port are arranged on the same side of the core body deviating from the filter.

Further, the first channel penetrates the core body in an extending direction of the first optical fiber; and/or the second channel extends through the core body in the direction of extension of the second optical fiber.

Further, the first channel is a tapered hole, and the end with the larger diameter of the first channel is away from the filter; and/or the second channel is a tapered hole, and the end with the larger diameter of the second channel deviates from the filter.

Further, the axes of the first channel and the second channel are located in the same plane, and the axes of the first channel and the second channel intersect.

Further, an end of the first optical fiber is flush with a first end face of the core body facing the filter; and/or an end of the first end of the second optical fiber is flush with the first end face of the core body facing the filter.

Furthermore, the first optical fiber and the first channel are fixed by glue filling; and/or the second optical fiber and the second channel are fixed by glue filling.

Further, the wavelength division multiplexer includes an optical housing, and the filter, the first collimating unit, and the two-core pin are disposed inside the optical housing.

Further, the optical housing is a straight-tube structure with two open ends along the arrangement direction of the filter, the first collimating unit and the dual-core contact pin.

Further, the first optical device comprises a body and a connecting pipe fixed on the body, the first collimating unit is arranged in the body, and the connecting pipe is sleeved outside the optical shell.

Further, the connecting pipe and the optical shell are bonded by ultraviolet curing glue; or, the connecting pipe and the optical shell are welded by laser.

Further, the wavelength division multiplexer includes a connector disposed on a second end of the first optical fiber connecting the second optical device.

Further, the connector is a ceramic ferrule, and the wavelength division multiplexer is connected with the second optical device in a plug-in manner through the connector.

Further, the first optical fiber is coiled and placed; and/or, the second optical fiber is coiled and placed.

An optical module includes a housing for accommodating the wavelength division multiplexer, the first optical device and the second optical device, and the BIDI device.

Further, the wavelength division multiplexer includes the port and sets up spacing portion on the port, the port sets up the second end of second optic fibre, include in the casing with spacing portion complex location portion.

Furthermore, one of the positioning part and the limiting part is a groove, and the other is a bump.

A method of production comprising:

providing the wavelength division multiplexer;

coupling and fixing the first optical device and a first optical port of the wavelength division multiplexer;

connecting the first optical fiber and the second optical device;

the second end of the second optical fiber is mounted to a port.

Further, the providing a wavelength division multiplexer includes the steps of: inserting the first optical fiber into the first channel, and curing the first optical fiber and the first channel; inserting the second optical fiber into the second channel, and curing the second optical fiber and the second channel; grinding the end plane of the double-core contact pin facing the first collimation unit; coupling and fixing the filter and the first collimating unit to form a coupling body; and coupling the coupling body and the two-core contact pin.

Further, before the coupling fixes the first optical device and the first optical port of the wavelength division multiplexer, the production method further includes: an optical housing is sleeved on the outer surfaces of the coupling body and the two-core contact pin.

Further, the first optical device includes a body and a connection pipe fixed on a side of the body facing the wavelength division multiplexer, and the step of coupling and fixing the first optical device and the wavelength division multiplexer further includes: and penetrating the optical shell into the connecting pipe and fixedly connecting the optical shell.

Further, before the first optical fiber is connected to the second optical device, the production method further includes: the first optical fiber is connected with a second end mounting connector of the second optical device; the first optical fiber is connected with the second optical device in a plug-in mode through the connector.

Further, before the first optical fiber is connected to the second optical device, the production method further includes: coiling the first optical fiber and the second optical fiber.

The beneficial effects are that: compared with the prior art, the BIDI device, the optical module and the production method have the advantages that the first optical port and the first optical device are fixedly coupled, so that the first optical port and the first optical device are fixedly coupled without adopting an optical fiber form, the first optical port is directly close to the body of the first optical device, light rays emitted or received by the first optical port directly include the body of the chip to be communicated with the optical path directly, and the size is saved;

the included angle A between the normal of the plane of the filter and the optical axis of the parallel light is less than or equal to 5 degrees, so that the energy loss of two polarization states of the light beam in the process of transmitting the filter can be reduced, and therefore, the waste of light energy is avoided by reducing the angle of the filter 110; the filter is combined to receive the parallel light from the first collimation unit, the filter is adopted to process the parallel light instead of converging the light, the difference between the light rays emitted from or incident to the filter and the plane normal line included angle of the filter can be eliminated, the difference and the drift of the center value of the band-pass wavelength caused by the difference can be further avoided, the density of wavelength intervals can be increased, the wavelength division density is met, the wavelength between the two light beams is closer, the number of more multiple carriers can be increased under the same power, and the selection range of the carrier wavelength is widened, so that a designer can select a high dispersion area avoiding a band near 1300nm and change the high dispersion area into bands with other wavelengths when in specific design, the dispersion is a main factor for limiting the improvement of transmission distance in optical fiber transmission, and the long-distance transmission can be finally realized by increasing the wavelength selectivity and improving the channel capacity.

Drawings

FIG. 1 is a schematic diagram of a prior art pigtailed BIDI device;

FIG. 2 is a schematic diagram of a prior art pluggable BIDI device;

FIG. 3 is a schematic size relationship diagram of the structure shown in FIG. 2;

FIG. 4 is a schematic structural diagram of a BIDI device according to an embodiment of the present application;

FIG. 5 is an exemplary embodiment of an architecture for a component wavelength division multiplexer;

FIG. 6 is an enlarged view of a portion of the area C in FIG. 5;

FIG. 7 shows an exemplary structure of the area B in FIG. 4;

FIG. 8 shows an exemplary structure of the area B in FIG. 4;

FIG. 9 is a schematic optical path diagram of a BIDI device in accordance with an embodiment of the present application;

FIG. 10 is a schematic diagram of a first optical path formed by a first optical port and a second optical port according to an embodiment of the present disclosure;

FIG. 11 is a schematic diagram illustrating a second optical path formed by a second optical port and a third optical port in an embodiment of the present application;

fig. 12 is a schematic structural diagram of an optical module according to an embodiment of the present application;

FIG. 13 is a schematic view of the optical axis of a light beam coincident with the normal to the plane of the filter, where the light beam is converging light;

FIG. 14 is a schematic view of the optical axis of a light beam coincident with the normal to the plane of a filter, where the light beam is a parallel light;

FIG. 15 is a flow chart embodiment of a method of production of the present application;

FIG. 16 is another embodiment of a flow chart of a method of production of the present application.

Detailed Description

It should be noted that, in the case of conflict, the technical features in the examples and examples of the present application may be combined with each other, and the detailed description in the specific embodiments should be interpreted as an explanation of the present application and should not be construed as an improper limitation of the present application.

In the description of the embodiments of the present application, the "up", "down", "left", "right", "front", "back" orientation or positional relationship is based on the orientation or positional relationship shown in fig. 3, it is to be understood that these orientation terms are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the present application.

A BIDI device, as shown in fig. 4 to 11, includes a wavelength division multiplexer 100, a first optical device 200, and a second optical device 300.

The wavelength division multiplexer 100 includes a first optical port 101, a second optical port 102, a third optical port 103, a first collimating unit 120, and a filter 110.

As shown in fig. 4, 5, 9, 10, and 11, a first optical path that passes through the first collimating unit 120 and the filter 110 is formed between the first optical port 101 and the second optical port 102; a second optical path reflected by the filter 110 is formed between the second optical port 102 and the third optical port 103.

As shown in fig. 1 and 3, the first optical port 101 is fixedly coupled to the first optical device 200, the second optical port 102 is optically connected to the second optical device 300, and the third optical port 103 is configured to receive external light or emit light.

The second optical port 102 and the second optical device 300 can be optically connected (mentioned below) through the first optical fiber 144, or can be directly coupled and fixed together to reduce one optical fiber structure; the third optical port 103 may be optically connected to the outside through a second optical fiber 145 (mentioned below).

It should be noted that, the coupling fixation between the first optical port 101 and the first optical device 200 is not in the form of an optical fiber, but the first optical port 101 is directly close to the body 230 of the first optical device 200, and light emitted or received by the first optical port 101 directly includes the direct optical path communication of the body 230 of the chip, which eliminates the following problems in the conventional pigtail type BIDI device: ceramic package 120 ', optical fiber 110 ' connected to optical transmitter 200 ', socket structure of optical transmitter 200 ', and socket structure on WDM component 100 ', which serve to save more volume; in addition, due to the direct coupling fixation, the pigtails (i.e. the first optical fiber 144 and the second optical fiber 145) extending from the second optical port 102 and the third optical port 103 do not need to adopt the conventional fused biconical taper, so that the biconical taper region is saved, the overall volume of the wavelength division multiplexer 100 is reduced, and the size of the BIDI device is further reduced.

It is understood that, as shown in fig. 4 to 8, the second light port 102 and the third light port 103 are located on the same side of the filter 110, and the first light port 101 is located on the opposite side of the filter 110. If the BIDI device adopts the fiber coiling process, the first optical fiber 144 and the second optical fiber 145 extending from the second optical port 102 and the third optical port 103 on the same side can be coiled together, so that the volume occupied by the coiled fibers is reduced.

In the prior art, a pigtail type or plug-in type BIDI device adopts a 45-degree filter for light splitting, and the light processed on the filter is also traditional converged light.

As shown in fig. 2 and 3, the pluggable BIDI device generally uses a coaxial package form of a 45 ° filter 110 "split plus converging lens incidence, and the TO cap 201" of the optical transmitter 200 "and the TO cap 301" of the optical receiver 300 "are both used TO converge the light beam. The D light with a certain wavelength emitted by the light emitter 200 "is converged by the TO cap 201" of the light emitter 200 "TO reach the surface of the 45 ° filter 110", and is transmitted from the 45 ° filter 110 "TO the port 120", so that light emission is completed; e light with a certain wavelength emitted from the outside passes through the port 120 "and reaches the surface of the 45 ° filter 110", and is reflected from the 45 ° filter 110 "into the TO cap 301" of the optical receiver 300 ", completing the light reception.

However, the wavelength interval is strongly related TO the angle change, if the 45 ° filter 110 "is 45 °, the angle change is 90 °, on one hand, since the TO cap 201" of the optical transmitter 200 "is not mounted on the optical transmitter 200" by coupling, the light emitted from the TO cap 201 "of the optical transmitter 200" has uncontrollable convergence angle and large error, on the other hand, since the 45 ° filter 110 "is directly adhered on the 45 ° supporting surface 111" without coupling, the angles of the 45 ° supporting surfaces 111 "have each tolerance, and the thicknesses of the glue for adhering the 45 ° filter 110" are different; whether the collection angle of the light emitted from the TO cap 201 'of the optical transmitter 200' or 45 DEG

The filter 110 "is positioned at an angle that is not possible to perform the coupling calibration from the production point of view, and therefore, in the prior art device, the wavelength center of the light to be wavelength-divided needs to be set aside with a corresponding width margin, which in turn causes the wavelength interval of the wavelength division to need to be further widened.

In addition, since the optical transmitter 200 ", the optical receiver 300" and the port 120 "are all fixed on the tube 100", the displacement of the port 120 ", even on the micron scale, may affect the quality of the light beams emitted and received by the optical transmitter 200" and the optical receiver 300 "at the same time, and the displacement of any one of the optical transmitter 200" and the optical receiver 300 "may also cause the optical port (108) to fail to normally transmit and receive light, the problems of the optical transmitter 200", the optical receiver 300 "and the port 120" are superimposed, so that the yield is low, and when the module is used at a module level, since the parts are hard-connected, the position of each part cannot be adjusted, and must be accurate, and if not, the part cannot be installed in the module, so that the yield is further reduced. When any one of the optical transmitter 200 ", the optical receiver 300", the port 120 "and the tube 100" is damaged, all the parts need to be reworked, only one joint is arranged between the parts, and the parts can only be manufactured through a one-time instant curing process, such as laser welding, without a second coupling calibration method.

In summary, the filter 110 "with the 45 ° converged light is adopted, and the D light and the E light are required to have a larger wavelength interval no matter in the pigtail type or the plug-in type, so that the number of signal carriers is reduced, and the capacity of a channel is reduced; the number of signal carriers is reduced, a waveband near 1300nm is required to be used, the wavelength of the waveband is a large dispersion window, the optical power of the device is small, and due to the loss of the optical power caused by splitting of the 45-degree filter 110 ", the BIDI device cannot support long-distance transmission of more than 40km due to multiple factors.

In order to realize long distance transmission, as shown in fig. 4 to 11, the filter 110 is used to process the parallel light 111 arriving at the mirror surface, wherein the parallel light 111 on the first optical path is transmitted by the filter 110; the parallel light 111 on the second light path is reflected by the filter 110, thereby realizing the light splitting function.

It is understood that the parallel light 111 in the embodiment of the present application refers to: in laser communication, a beam having an "image side beam waist at an image side focal point" is satisfied in principle. However, the parallel light shaping caused by process, manufacturing or other process deviations does not absolutely conform to the definition, and the parallel light 111 described in this patent can be considered as long as the description of the definition of the parallel light in the gaussian beam is not deviated from the principle.

One of the first optical device 200 and the second optical device 300 is an optical transmitter, and the other is an optical receiver; depending on the functions of the first optical device 200 and the second optical device 300, the light transmission directions of the first optical path and the second optical path are different.

If the first optical device 200 is an optical receiver, the second optical device 300 is an optical transmitter:

as shown in fig. 11, in the second optical path, light emitted by the second optical device 300 enters the third optical port 103 through the second optical port 102, wherein converged light (shown by a solid line in the figure, the same applies below) emitted by the second optical device 300 enters through the second optical port 102, the converged light is converted into parallel light 111 (shown by a dotted line in the figure, the same applies below) after passing through the first collimating unit 120, the parallel light 111 is reflected by the filter 110 and then converted into converged light again through the first collimating unit 120, and the converged light is transmitted to the outside through the third optical port 103; the emission of the optical signal is completed.

As shown in fig. 10, in the first optical path, external light enters the first optical port 101 through the third optical port 103 and then enters the first optical device 200. The converged light emitted from the outside is emitted from the first light port 101, and is converted into parallel light 111 after passing through the first collimating unit 120, and the parallel light 111 reaches the first light port 101 after passing through the filter 110, and is received by the first optical device 200 coupled and fixed with the first light port 101; the reception of the optical signal is completed.

If the first optical device 200 is an optical transmitter, the second optical device 300 is an optical receiver:

as shown in fig. 10, in the first optical path, the light emitted from the first optical device 200 enters the third optical port 103 through the first optical port 101 and then passes to the outside. Parallel light 111 emitted by the first optical device 200 enters the first light port 101, passes through the filter 110 and reaches the first collimating unit 120, the parallel light 111 passes through the first collimating unit 120 and is converted into convergent light, and the convergent light is transmitted to the outside from the third light port 103. The emission of the optical signal is completed.

As shown in fig. 11, in the second optical path, external light enters the second optical port 102 through the third optical port 103 and enters the second optical device 300, wherein externally emitted converged light (indicated by a solid line in the figure, the same applies below) enters through the third optical port 103, the converged light is converted into parallel light 111 (indicated by a dotted line in the figure, the same applies below) after passing through the first collimating unit 120, the parallel light 111 is reflected by the filter 110 and then converted into converged light again after passing through the first collimating unit 120, and the converged light is transmitted to the second optical device 300 through the third optical port 103; the reception of the optical signal is completed.

It can be known that whether the first optical device 200 is an optical transmitter or an optical receiver, the corresponding optical path is not affected, and the specific design may be the standard. In the following embodiments, unless otherwise described, the first optical device 200 is used as an optical transmitter and the second optical device 300 is used as an optical receiver, so that repeated descriptions are avoided.

In the embodiment of the present application, the optical transmitter may be any type of laser in a package, such as a BOX type, a TO type, a butterfly type, a PIN in-line type, a hermetic type, a non-hermetic type, and the like. Similarly, in the embodiment of the present application, the optical receiver may be any type of packaged detector, such as a BOX type, a TO type, a butterfly type, a PIN in-line type, a hermetic type, a non-hermetic type, and the like.

As shown in fig. 5 to 11, the angle a between the normal of the plane of the filter 110 and the optical axis of the parallel light 111 is less than or equal to 5 °, it is understood that there is no absolute parallelism, and in the case of less than 5 °, the parallel light 111 in the first optical path and the second optical path are almost parallel, and therefore can be regarded as having coincident optical axes; specifically, the plane normal of the filter 110 makes an angle a of less than or equal to 5 ° with the optical axis of the parallel light 111 in the first optical path.

As shown in fig. 2 and 3, the wavelength intervals between the D light and the E light distinguished by the 45 ° filter 110 ″ cannot be dense, and the optical power loss of this optical splitting method is large, which does not support realization of local area network wavelength division (hereinafter, abbreviated as LAN-WDM) or dense wavelength division (hereinafter, abbreviated as DWDM). Theoretically, the wavelength of a waveband drifts 0.4-0.5 nm along with the increase and decrease of the angle of a filter by 1 degree, in the industry standard, the central interval of a LAN-WDM wavelength division waveband is 4.5nm, that is, if the angle between the angle of light and the normal line of the filter exceeds 11.2 degrees, the crosstalk between two wavebands of the central interval of the LAN-WDM wavelength division waveband with the angle of 4.5nm as the standard is very obvious, currently, the density and crosstalk requirements of the wavelength division waveband of a high-speed long-distance transmission system with the length of more than 40km are high, the basic requirement is not met when the angle of the filter is larger, and the requirement of DWDM with the smaller central interval of the wavelength division waveband is only higher.

It is understood that in the embodiment of the present application, the light beam entering from the first optical port 101 or the third optical port 103 has two polarization states, and from an optical point of view, only when the normal of the plane of the filter 110 is completely parallel to the light beam without an included angle, the waves of the two polarization states overlap, and the transmitted power is maximum; as the angle between the normal to the plane of the filter 110 and the light beam increases, the wavelengths of the two polarization states are separated more, so that the wavelength band is widened more, and the interval between the central wavelengths of the wavelength band becomes larger.

Because both polarization states carry light energy, when the central wavelength is spaced to a polarization state wave band and cannot be used, light energy carried by one polarization state of the wave band is wasted, and the requirement on the light power in long-distance transmission is extremely high, and the waste of the light energy inevitably causes the shortening of the transmission distance.

Therefore, the angle of the filter 110 is set to be less than or equal to 5 ° in the embodiment of the present application, and compared to the conventional 45 ° light splitting, the energy loss of the two polarization states of the light beam of the first optical path is very small in the process of transmitting through the filter 110; similarly, the energy loss of the light beam of the second optical path is also very small in the process of being reflected by the filter 110; thus, by reducing the angle of the filter 110, waste of light energy is avoided.

It should also be noted that a small angle setting of the filter 110 should be used in combination with parallel light. In the prior art, as shown in fig. 2 and 13, even if the normal of the plane of the filter 110 "coincides with the optical axis of the incident light, since the incident light is the converged light, the edge of the light beam still has an included angle H with the filter 110", and the closer to the optical axis of the light beam, the smaller the included angle H of the light beam is, the different angles at each position of the light beam are, and further the wavelength of the wavelength band is shifted differently, so that the wavelength center value of the light to be wavelength-divided needs to leave a corresponding width margin, and this causes the wavelength interval of the wavelength division to be further widened. As shown in fig. 9 to 11 and fig. 14, the parallel light 111 is processed using the filter 110 instead of the condensed light, the difference in the angle of the light exiting or entering the filter 110 with respect to the normal to the plane of the filter 110 can be eliminated, thereby avoiding the difference and drift of the center value of the band-pass wavelength caused by the difference, increasing the density of the wavelength interval, i.e., wavelength division density, i.e., the wavelengths between the beams in the first and second optical paths are closer together, the number of more carriers can be increased under the same power, the selection range of the carrier wave length is widened, therefore, the designer can choose to avoid the high dispersion region near 1300nm and change to use the other wavelength band, in the optical fiber transmission, the dispersion is a main factor limiting the increase of the transmission distance, and the long-distance transmission can be finally realized by increasing the wavelength selectivity and increasing the channel capacity.

As shown in fig. 4 to 11, the first collimating unit 120 can convert the normal light ray and the parallel light 111 into each other, and the normal light ray is defined as a converging light ray or a diverging light ray with respect to the parallel light 111 in various embodiments of the present application. The filter 110 can receive the parallel light 111 from the first collimating unit 120, the first collimating unit 120 can be a collimating lens, and the first collimating unit 120 should be disposed on a side of the filter 110 facing away from the first optical port 101, so as to ensure that the paths of the first optical path and the second optical path both pass through the first collimating unit 120.

As is known, the mutual coupling of the parallel light 111 is only sensitive to the incident angle, and the coupling of the focal length is not required to be carried out by the convergent light, so that the device can be more easily coupled and fixed by adopting the output form of the parallel light 111, and the device is compatible with the effects of various processes.

Assuming that the first collimating unit 120 is disposed at a side of the filter 110 close to the first light port 101, the first light path is the parallel light 111, and the second light path does not pass through the first collimating unit 120 all the time, so that the conventional converged light still exists, and the problem of processing the converged light on the filter 110 still exists, wherein the first light path adopts the parallel light 111, and the second light path does not adopt, which inevitably causes mismatching between the two, so that the coupling is more difficult, and a better long-distance transmission effect cannot be obtained.

Therefore, it is required that the first collimating unit 120 should be disposed at a side of the filter 110 facing away from the first light port 101 so that the parallel light 111 is processed regardless of whether the filter 110 is reflective or transmissive.

In one possible embodiment, as shown in fig. 9 to 11, the parallel light 111 exists on the propagation path between the first collimating unit 120 and the filter 110, and the existence herein means that the parallel light may exist partially or entirely. Specifically, in the first optical path or the second optical path, when the light travels from the filter 110 to the first collimating unit 120, the state of the light is converted from the parallel light 111 to the convergent light; when the light propagates from the first collimating unit 120 to the filter 110, the light is converted from the converging light to the parallel light 111, so that the parallel light 111 is all processed on the filter 110, and a higher channel capacity is ensured, and long-distance transmission is realized.

In one possible embodiment, as shown in fig. 7, 9 and 10, the first optical device 200 includes a second collimating unit 210 matched with the first collimating unit 120, and the second collimating unit 210 may be a collimating lens. The second collimating unit 210 transforms the light rays and the parallel light 111 to facilitate the application of the conventional first optical device 200 for emitting the converged light rays in the present apparatus.

Specifically, in the first optical path, the conversion of the second collimating unit 210 is just opposite to that of the first collimating unit 120, the converged light emitted by the chip assembly 250 of the first optical device 200 is converted into parallel light 111 through the second collimating unit 210, the parallel light 111 enters from the first optical port 101, passes through the filter 110 and reaches the first collimating unit 120, the parallel light 111 is converted into converged light after passing through the first collimating unit 120, and the converged light is transmitted to the outside from the third optical port 103. The emission of the optical signal is completed.

When the first optical device 200 is an optical transmitter, the chip assembly 250 is an optical generating chip for emitting light; when the first optical device 200 is an optical receiver, the chip assembly 250 is an optical receiving chip, and converts an optical signal into an electrical signal.

In one possible embodiment, as shown in fig. 8, the wavelength division multiplexer 100 includes a first lens unit 130, the first lens unit 130 being disposed at a side of the filter 110 close to the first optical device 200 to convert the light and the parallel light 111 into each other; the first optical device 200 includes a second lens unit 220 coupled to the first lens unit 130, and the second lens unit 220 transforms light rays and parallel light rays 111 so that the conventional first optical device 200 emitting converged light rays can be applied to the apparatus.

Specifically, in the first optical path, the conversion of the first lens unit 130 is just opposite to that of the second lens unit 220, the converged light emitted by the chip assembly 250 of the first optical device 200 is converted into the parallel light 111 through the second collimating unit 210, the parallel light 111 is transmitted for a certain distance, the parallel light 111 is converted into the converged light through the second lens unit 220, the converged light enters from the first optical port 101, the converged light is converted into the parallel light 111 after passing through the first lens unit 130, the parallel light 111 reaches the first collimating unit 120 through the filter 110, the parallel light 111 is converted into the converged light after passing through the first collimating unit 120, and the converged light is transmitted to the outside from the third optical port 103. The emission of the optical signal is completed.

The first lens unit 130 and the second lens unit 220 may be ball lenses or collimating lenses.

In one possible embodiment, as shown in fig. 4 to 11, the wavelength division multiplexer 100 includes a two-core stub 140, the two-core stub 140 including a core body 141, a first optical fiber 144, a second optical fiber 145, a first channel 142 through which the first optical fiber 144 passes, and a second channel 143 through which the second optical fiber 145 passes; the core body 141 is disposed at a side of the first collimating unit 120 facing away from the filter 110.

The side of the filter 110 away from the core body 141 is a first optical port 101, which is directly and fixedly coupled to the first optical device 200. The end of the first channel 142 away from the filter 110 is a second optical port 102, the first end of the first optical fiber 144 is aligned with the first collimating unit 120, the first optical fiber 144 is inserted into the second optical port 102, and the wavelength division multiplexer 100 is connected to the second optical device 300 through the first optical fiber 144; that is, the second end of the first optical fiber 144 is connected to the second optical device 300, and after the corresponding coupling is completed, the first optical fiber 144 and the first channel 142 can be fixed by glue. The end of the second channel 143 facing away from the filter 110 is a third optical port 103, the first end of the second optical fiber 145 is aligned with the first collimating unit 120, the second optical fiber 145 is inserted into the third optical port 103, and is connected to the outside through the second end of the second optical fiber 145, and after the corresponding coupling is completed, the second optical fiber 145 and the second channel 143 are fixed by glue filling.

Thus, the first optical device 200, the first optical port 101, the filter 110, the first collimating unit 120, the first end of the second optical fiber 145, the second optical fiber 145 (passing through the third optical port 103), and the second end of the second optical fiber 145 form the aforementioned first optical path, and the receiving or transmitting of the light is realized in the first optical path.

The second optical device 300-the second end of the first optical fiber 144-the first optical fiber 144 (passing through the second optical port 102) -the first end of the first optical fiber 144-the first collimating unit 120-the filter 110-the first collimating unit 120-the first end of the second optical fiber 145-the second optical fiber 145 (passing through the third optical port 103) -the second end of the second optical fiber 145 forms the aforementioned second optical path in which the transmission or reception of light is realized.

It should be noted that, whether a conventional plug-in BIDI device or a conventional pigtail BIDI device, the basic function of the wavelength division multiplexer is to split light, and the split light is first to achieve physical separation between two ends, i.e., a socket F and a socket G for fiber access as shown in fig. 1, and a ceramic plug 120' and an optical receiver 300 "as shown in fig. 2 and 3. The 45 ° filter 110 "is inclined by 45 ° so that the ends are vertically branched, thereby obtaining the necessary separation distance S3 between the two ends with the minimum volume, when the inclination angle H of the 45 ° filter 110" is reduced, it is foreseeable that the separation distance S3 with the same length is obtained, the smaller the inclination angle H of the filter 110 "is, the longer the distances S1 and S2 that the light path is formed by are, thereby leading to the infinite increase of the total volume; similarly, the conventional pigtail type also has a corresponding problem, and therefore, the volume of the pluggable or pigtail type BIDI device adopting the 45 ° filter 110 ″ is increased by directly changing the pluggable or pigtail type BIDI device into a small angle.

As shown in fig. 3 and 5, since two first optical fibers 144 and two second optical fibers 145 having a diameter of micrometer count are inserted into the core body 141, the diameter of the core body 141 can be designed to be small, for example, when the angle a between the normal line of the plane of the filter 110 and the optical axis of the parallel light 111 in the first light path is 5 °, the angle between the first optical fiber 144 and the second optical fiber 145 is about 10 °, and when the angle a between the normal line of the plane of the filter 110 and the optical axis of the parallel light 111 in the first light path is 1 °, the angle between the first optical fiber 144 and the second optical fiber 145 is about 2 °, which is almost regarded as parallel to be transmitted or reflected from the filter 110. The required separation distance S4 between the first optical fiber 144 and the second optical fiber 145 is much smaller than the center separation distance S3 in the prior art, so the distance (not shown) of the optical path after calculation is also reduced considerably, so that the light incident from the second optical fiber 145 can reflect the first optical fiber 144 at a small angle, and the distance between the second optical port 102 and the third optical port 103 is directly reduced, which is not only suitable for the case of small-angle inclination of the filter 110, but also reduces the volume of the wavelength division multiplexer 100, and meets the requirement of miniaturized module assembly.

It should be understood that, in the prior art, the high wavelength division density (or the effect directly brought by the small angle of the filter) and the small size of the BIDI device are two technical points which are relatively contradictory; specifically, the plug-in BIDI device is limited in that the volume structure of the plug-in BIDI device cannot meet the small angle of the filter, and although the tail fiber type BIDI device with larger volume can meet the small angle of the filter, the volume does not meet the requirement; it is not simple to relate the small angle of the filter to a small volume.

In the embodiment of the present application, the angles of the first channel 142 and the second channel 143 of the dual core pin 140 are designed to match with the filter 110 by using a small angle tilt of the filter 110, so that the first fiber 144 and the second fiber 145 can be coupled with the filter 110 to meet the volume and achieve the wavelength division band center spacing specified by the BIDI device in the LAN-WDM or even DWDM standards.

In one possible embodiment, as shown in fig. 5, the first channel 142 extends through the core body 141 in the direction of extension of the first optical fiber 144; the second channel 143 penetrates the core body 141 in the extending direction of the second optical fiber 145; under the condition that the filter 110 is arranged at a small angle, the included angle between the first optical fiber 144 and the second optical fiber 145 is small, and the axial directions of the first optical fiber 144 and the second optical fiber 145 are considered to be approximately consistent with the axial direction of the core body 141; it should be understood that there is no absolute agreement, and thus, the axial direction of the core body 141 does not represent the first optical fiber 144 being parallel to the second optical fiber 145, and both may be slightly inclined from the axial direction of the core body 141, and is generally considered satisfactory to be within 20 °.

In one possible embodiment, as shown in fig. 5, the first channel 142 is a tapered hole, and the end of the first channel 142 with the larger diameter forms the second optical port 102 away from the filter 110, so as to facilitate the insertion assembly of the first optical fiber 144; the end of the first optical fiber 144 is flush with the first end face of the core body 141 facing the filter 110 so as to receive or transmit an optical signal. The second channel 143 is a tapered hole, and the end with the larger diameter of the second channel 143 faces away from the filter 110 to form a third optical port 103, so that the insertion and assembly of the second optical fiber 145 are facilitated; the end of the first end of the second optical fiber 145 is flush with the first end face of the core body 141 facing the filter 110 so as to receive or transmit an optical signal.

In one possible embodiment, as shown in fig. 5, the axes of the first channel 142 and the second channel 143 are in the same plane, and the axes of the first channel 142 and the second channel 143 intersect, so that the second light path is satisfied to perform reflection on the filter 110.

In one possible embodiment, as shown in fig. 4 to 7, the wavelength division multiplexer 100 includes an optical housing 170, and the filter 110, the first collimating unit 120 and the two-core pin 140 are disposed inside the optical housing 170, and generally, the filter 110, the first collimating unit 120 and the two-core pin 140 are already coupled and fixed together in advance, so that the optical housing 170 can be fixed with any one or more of them.

The optical housing 170 may be a unitary or discrete component, and may be made of metal or nonmetal, and may be made of stainless steel material according to different processes, or glass or plastic material when connected by potting.

In one possible embodiment, as shown in fig. 4 to 7, the optical housing 170 is a straight cylindrical structure having both ends opened in the arrangement direction of the filter 110, the first collimating unit 120, and the two-core pins 140. Specifically, because the filter 110 employs a small angle and the first optical fiber 144 is spaced from the second optical fiber 145 by a short distance, the first optical fiber can collectively extend from the first end of the optical housing 170 to form a pigtail.

In a possible embodiment, as shown in fig. 4 to 7, the first optical device 200 includes a body 230 and a connecting pipe 240 fixed on the body 230, the first collimating unit 120 is disposed in the body 230, a chip component 250 is further included in the body 230, the connecting pipe 240 is sleeved outside the optical housing 170, the second end of the optical housing 170 is close to the bottom of the connecting pipe 240, so that the first optical port 101 extends to a position of a connecting seam 241 between the body 230 and the connecting pipe 240, and is close to the chip component 250, thereby satisfying the requirement of directly coupling and fixing the body 230 and the first optical port 101, and the chip component 250 can be directly connected with the optical path of the first optical port 101 without using an optical fiber, thereby omitting an intermediate transition part and saving the volume.

There are various ways of connecting the connection tube 240 to the optical housing 170; for example, the connection tube 240 and the optical housing 170 may be bonded by using an ultraviolet curing adhesive, and at this time, the connection tube 240 needs to be made of transparent plastic or glass to facilitate ultraviolet irradiation, and may be made of other materials, and the connection tube 240 may be provided with a dispensing hole 242 to facilitate dispensing and ultraviolet irradiation; alternatively, the connecting tube 240 and the optical housing 170 may be laser welded, or two or more fixed and mixed ways may be adopted.

In one possible embodiment, as shown in fig. 4-7, the wavelength division multiplexer 100 includes a connector 180, the connector 180 being disposed on a second end of the first optical fiber 144 to which the second optical device is connected to facilitate connection of the second optical device 300. Typically, the connector 180 is a ferrule, and the wavelength division multiplexer 100 is connected to the second optical device 300 by the connector 180 in a plug-in manner.

In one possible embodiment, as shown in FIG. 12, the first optical fiber 144 may be coiled; the second optical fiber 145 is coiled for volume savings.

An optical module includes a housing 400 and the above-mentioned BIDI device, the housing 400 is used to accommodate a wavelength division multiplexer 100, a first optical device 200 and a second optical device 300, thereby forming a complete functional module.

In a possible embodiment, as shown in fig. 12, the wavelength division multiplexer 100 includes a port 190 and a position-limiting portion 191 disposed on the port 190, the port 190 is disposed at the second end of the second optical fiber 145, a positioning portion 401 engaged with the position-limiting portion 191 is included in the housing 400, one of the positioning portion 401 and the position-limiting portion 191 is a groove, and the other is a bump, so that the accuracy requirement of the mounting position of the module is not high, and therefore, the yield can be further improved by flexibly adjusting as needed.

A method of manufacturing, as shown in fig. 15 and 16, a BIDI device as described above, comprising:

s10, providing a wavelength division multiplexer 100;

s20, coupling and fixing the first optical device 200 and the first optical port 101 of the wavelength division multiplexer 100;

s30, connecting the first optical fiber 144 and the second optical device 300;

s40, and a second end of the second optical fiber 145 is mounted with a port 190.

Wherein the providing of the main body of the wavelength division multiplexer 100 comprises the steps of:

s01, inserting the first optical fiber 144 into the first channel 142, and curing the first optical fiber 144 and the first channel 142;

s02, inserting the second optical fiber 145 into the second channel 143, and solidifying the second optical fiber 145 and the second channel 143;

s03, grinding the two-core pin 140 toward the end plane of the first collimating unit 120;

s04, coupling the fixed filter 110 and the first collimating unit 120 to form a coupled body;

s05, coupling the coupling body with the two-core pin 140; the first optical fiber 144 at the second optical port 102 is connected to an optical power meter, the second optical fiber 145 at the third optical port 103 is connected to a light source, the first optical port 101 is connected to a spot analyzer, and the light sources and the spot analyzer are respectively coupled to the required optical power and the spot shape, and the light beam of the first optical port 101 is parallel light in the invention.

In a possible implementation, as shown in fig. 16, before the coupling fixes the first optical device 200 and the first optical port 101 of the wavelength division multiplexer 100, the production method further includes:

s11, the optical housing 170 is sleeved on the outer surfaces of the coupling body and the two-core pin 140.

In one possible implementation, in the step of coupling and fixing the first optical device 200 and the main body of the wavelength division multiplexer 100, a specific embodiment includes: the optical housing 170 is penetrated into the connection pipe 240, thereby fixing the optical housing 170 and the connection pipe 240.

In a possible embodiment, as shown in fig. 16, before the step of connecting the first optical fiber 144 to the second optical device 300, the production method further includes:

s21, the first optical fiber 144 is connected to the second end mounting connector 180 of the second optical device 300; the first optical fiber 144 is plug connected to the second optical device 300 via the connector 180.

In one possible embodiment, as shown in fig. 16, before the first optical fiber 144 is connected to the second optical device 300, the production method further includes:

s22, a coiled fiber first optical fiber 144, and a second optical fiber 145.

After the step of installing the port 190 at the second end of the second optical fiber 145, the wavelength division multiplexer 100, the first optical device 200, and the second optical device 300 are accommodated in the housing 400, and the port 190 and the housing 400 are installed in a limited manner, thereby completing the production of the optical module. Specifically, the first optical fiber 144 at the second port 102 and the second optical fiber 405 at the third port 103 are coiled and loaded together into the module housing 400, the port 190 is placed in the port retainer 401 of the module, and the connector 180 is inserted into the second optical device 300.

The various embodiments/implementations provided herein may be combined with each other without contradiction.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A BIDI device comprising a wavelength division multiplexer (100), a first optical device (200) and a second optical device (300); one of the first optical device (200) and the second optical device (300) is an optical transmitter, and the other is an optical receiver;

the wavelength division multiplexer (100) comprises a first optical port (101), a second optical port (102), a third optical port (103), a first collimating unit (120) and a filter (110);

the first collimating unit (120) is arranged at a side of the filter (110) facing away from the first light port (101), the filter (110) being capable of receiving parallel light (111) from the first collimating unit (120);

the first optical port (101) is fixedly coupled with the first optical device (200), the second optical port (102) is optically connected with the second optical device (300), and the third optical port (103) is used for receiving external light or emitting light;

the included angle A between the normal of the plane of the filter (110) and the optical axis of the parallel light (111) is less than or equal to 5 degrees.

2. The BIDI device of claim 1, wherein: the first light device (200) comprises a second collimating unit (210) cooperating with the first collimating unit (120).

3. The BIDI device of claim 2, wherein: the first collimating unit (120) is a collimating lens; and/or the presence of a gas in the gas,

the second collimating unit (210) is a collimating lens.

4. The BIDI device of claim 1, wherein: the wavelength division multiplexer (100) comprises a two-core stub (140), the two-core stub (140) comprising a core body (141), a first optical fiber (144), a second optical fiber (145), a first channel (142) through which the first optical fiber (144) passes, and a second channel (143) through which the second optical fiber (145) passes;

the core body (141) is arranged on the side of the first collimating unit (120) facing away from the filter (110);

the side, away from the core body (141), of the filter (110) is the first light port (101);

the end of the first channel (142) facing away from the filter (110) is the second optical port (102), the first end of the first optical fiber (144) is aligned with the first collimating unit (120), the first optical fiber (144) is arranged in the second optical port (102) in a penetrating way, and the wavelength division multiplexer (100) is connected with the second optical device (300) through the first optical fiber (144);

the end of the second channel (143) facing away from the filter (110) is the third light port (103), the first end of the second optical fiber (145) is aligned with the first collimating unit (120), and the second optical fiber (145) is inserted into the third light port (103).

5. The BIDI device of claim 4, wherein: the second light port (102) and the third light port (103) are arranged on the same side of the core body (141) facing away from the filter (110).

6. The BIDI device of claim 4, wherein: the first channel (142) penetrates the core body (141) in the extension direction of the first optical fiber (144); and/or the presence of a gas in the gas,

the second channel (143) penetrates the core body (141) in an extending direction of the second optical fiber (145).

7. The BIDI device of claim 4, wherein: the first channel (142) is a conical hole, and the end of the first channel (142) with the larger diameter faces away from the filter (110);

and/or the second channel (143) is a tapered hole, and the end with the larger diameter of the second channel (143) faces away from the filter (110).

8. The BIDI device of claim 4, wherein: the axes of the first channel (142) and the second channel (143) are located in the same plane, and the axes of the first channel (142) and the second channel (143) intersect.

9. The BIDI device of claim 4, wherein: an end of the first optical fiber (144) is flush with a first end face of the core body (141) facing the filter (110); and/or the presence of a gas in the gas,

the end of the first end of the second optical fiber (145) is flush with the first end face of the core body (141) facing the filter (110).

10. The BIDI device of claim 4, wherein: the first optical fiber (144) and the first channel (142) are fixed by glue filling; and/or the presence of a gas in the gas,

and the second optical fiber (145) and the second channel (143) are fixed by glue filling.

11. The BIDI device of claim 4, wherein: the wavelength division multiplexer (100) includes an optical housing (170), and the filter (110), the first collimating unit (120), and the two-core pin (140) are disposed inside the optical housing (170).

12. The BIDI device of claim 11, wherein: the optical housing (170) is a straight cylinder structure with two open ends along the arrangement direction of the filter (110), the first collimating unit (120) and the dual core pins (140).

13. The BIDI device of claim 11, wherein: the first optical device (200) comprises a body (230) and a connecting pipe (240) fixed on the body (230), the first collimating unit (120) is arranged in the body (230), and the connecting pipe (240) is sleeved outside the optical housing (170).

14. The BIDI device of claim 13, wherein: the connecting pipe (240) is bonded with the optical shell (170) by adopting ultraviolet curing glue; alternatively, the connecting pipe (240) and the optical housing (170) are welded by laser.

15. The BIDI device of claim 4, wherein: the wavelength division multiplexer (100) comprises a connector (180), the connector (180) being arranged on a second end of the first optical fiber (144) connecting the second optical device (300).

16. The BIDI device of claim 15, wherein: the connector (180) is a ferrule, and the wavelength division multiplexer (100) is connected with the second optical device (300) in a plug-in manner through the connector (180).

17. The BIDI device of claim 4, wherein: the first optical fiber (144) is coiled; and/or, the second optical fiber (145) is coiled.

18. A light module, characterized in that it comprises a housing (400) and a BIDI device according to any of claims 4 to 17, said housing (400) being intended to house said wavelength division multiplexer (100), said first optical device (200) and said second optical device (300).

19. The light module of claim 18, wherein: the wavelength division multiplexer (100) comprises a port (190) and a limiting part (191) arranged on the port (190), the port (190) is arranged at the second end of the second optical fiber (145), and a positioning part (401) matched with the limiting part (191) is arranged in the shell (400).

20. The light module of claim 19, wherein: one of the positioning part (401) and the limiting part (191) is a groove, and the other is a bump.

21. A method of producing a BIDI device of claim 4, comprising:

-providing said wavelength division multiplexer (100);

a first optical port (101) for coupling and fixing the first optical device (200) and the wavelength division multiplexer (100);

connecting the first optical fiber (144) and the second optical device (300);

a second end of the second optical fiber (145) mounts a port (190).

22. The production method according to claim 21, wherein said providing a wavelength division multiplexer (100) comprises the steps of:

inserting the first optical fiber (144) into the first channel (142), curing the first optical fiber (144) and the first channel (142);

-inserting said second optical fiber (145) into said second channel (143), solidifying said second optical fiber (145) with said second channel (143);

grinding the end plane of the two-core pin (140) towards the first collimating unit (120);

coupling and fixing the filter (110) and the first collimating unit (120) to form a coupling body;

coupling the coupling body with the two-core pin (140).

23. The production method according to claim 22, wherein before said coupling fixes said first optical device (200) to said first optical port (101) of said wavelength division multiplexer (100), said production method further comprises:

an optical housing (170) is sleeved on the outer surfaces of the coupling body and the two-core pin (140).

24. The method according to claim 23, wherein the first optical device (200) comprises a body (230) and a connecting pipe (240) fixed to a side of the body (230) facing the wavelength division multiplexer (100), and the step of coupling and fixing the first optical device (200) and the wavelength division multiplexer (100) further comprises:

the optical housing (170) is inserted into the connection pipe (240) and fixedly connected.

25. The production method according to claim 21, wherein before the first optical fiber (144) is connected to the second optical device (300), the production method further comprises:

the first optical fiber (144) is connected to a second end mount connector (180) of the second optical device (300); the first optical fiber (144) is plug-connected to the second optical device (300) via the connector (180).

26. The production method according to claim 21, wherein before the first optical fiber (144) is connected to the second optical device (300), the production method further comprises:

coiling the first optical fiber (144) and the second optical fiber (145).