A single-fiber bidirectional device with specific wavelength reflection and its optical module

Abstract

This invention relates to the field of optical communication technology, and in particular to a single-fiber bidirectional device and its optical module with specific wavelength reflection, comprising: a transmitting TO-CAN, a receiving TO-CAN, an integrated tube, and a pigtail pin; the transmitting TO-CAN is coupled to one end of the integrated tube, the receiving TO-CAN is coupled to the side of the integrated tube, and the pigtail end of the pigtail pin is coupled to the other end of the integrated tube; a beam splitter and a filter are disposed at the central axis of the integrated tube, the beam splitter being used to reflect light returned from the pigtail pin into the receiving TO-CAN; the filter is disposed at the light inlet of the receiving TO-CAN; a grating fiber core is disposed inside the pigtail pin, the grating fiber core being located at the end of the pigtail pin, the grating fiber core being used to reflect light of a specific wavelength in the optical signal transmitted by the transmitting TO-CAN into the receiving TO-CAN.

Description

Technical Field

[0001] This invention relates to the field of optical communication technology, and in particular to a single-fiber bidirectional device with reflection in a specific wavelength band and its optical module. Background Technology

[0002] Currently, single-fiber bidirectional devices, as an important optical device in the field of modern optical communication, are ingeniously designed and powerful. Single-fiber bidirectional devices can simultaneously transmit and receive optical signals on the same optical fiber, which greatly improves the efficiency and flexibility of optical fiber communication. However, although current single-fiber bidirectional devices can transmit and receive optical signals on the same optical fiber, they do not have the function of reflecting specific wavelengths and cannot selectively reflect or transmit optical signals according to the wavelength of the optical signal.

[0003] Therefore, overcoming the shortcomings of the existing technology is an urgent problem to be solved in this technical field. Summary of the Invention

[0004] The technical problem that this invention aims to solve is that current single-fiber bidirectional devices do not have the function of reflecting specific wavelengths and cannot selectively reflect or transmit light signals according to their wavelengths.

[0005] The present invention adopts the following technical solution:

[0006] In a first aspect, the present invention provides a single-fiber bidirectional device with specific band reflection, comprising: a transmitter outline can (TO-CAN) 1, a receiver TO-CAN 2, an integrated tube 3, and a pigtail pin 4; the transmitter TO-CAN 1 is coupled to one end of the integrated tube 3, the receiver TO-CAN 2 is coupled to the side of the integrated tube 3, and the pigtail 407 end of the pigtail pin 4 is coupled to the other end of the integrated tube 3;

[0007] A beam splitter 300 and a filter 301 are provided at the central axis of the integrated tube 3. The beam splitter 300 is used to reflect the light returned from the pigtail pin 4 into the receiver TO-CAN2. The filter 301 is provided at the light inlet of the receiver TO-CAN2.

[0008] The pigtail pin 4 is provided with a grating fiber core 400, which is located at the end of the pigtail pin 4. The grating fiber core 400 is used to reflect light of a specific wavelength in the optical signal sent by the transmitting TO-CAN1 into the receiving TO-CAN2.

[0009] Preferably, a metal sleeve 302 is provided at one end of the integrated tube 3 that is coupled to the fiber optic pin 4. The metal sleeve 302 is fixedly connected to the integrated tube 3, and the fiber optic pin 407 of the fiber optic pin 4 is inserted into the metal sleeve 302. The central axis of the metal sleeve 302 is collinear with the central axis of the integrated tube 3.

[0010] Preferably, a through groove 303 is machined at the central axis of the integrated tube 3, and the beam splitter 300 and the filter 301 are disposed in the through groove 303; the center of the beam splitter 300 and the filter 301 coincides with the central axis of the TO cap of the receiving TO-CAN2, the beam splitter 300 is set at a certain angle, and the fiber core of the pigtail 407 is collinear with the center of the beam splitter 300, so that the light returning from the pigtail pin 4 is reflected by the beam splitter 300 into the receiving TO-CAN2.

[0011] Preferably, the TO caps of the transmitting TO-CAN1 and the receiving TO-CAN2 are teardrop caps 5, and a spherical lens 50 is provided at the front end of the teardrop cap 5, which is used to focus the optical signal.

[0012] Preferably, the fiber optic connector 4 includes an outer frame sleeve 401, an inner frame sleeve 402, and a metal straight sleeve 403. The inner frame sleeve 402 and the metal straight sleeve 403 are located inside the outer frame sleeve 401, and the inner frame sleeve 402 and the metal straight sleeve 403 are coupled and snapped together.

[0013] The fiber optic ferrule 4 has a first encapsulated core 404 inside, which is located inside the metal sleeve 403; the inner frame sleeve 402 is used to allow the second encapsulated core 405 of the external interface to pass through, and the second encapsulated core 405 is coupled to the first encapsulated core 404.

[0014] Preferably, the coupling end of the inner frame sleeve 402 and the metal straight sleeve 403 is provided with a first groove 4020, the metal straight sleeve 403 is inserted into the first groove 4020 and coupled with the first groove 4020, the two pairs of sidewalls of the first groove 4020 are provided with first locking slots 4021, and the outer sidewall of the metal straight sleeve 403 is machined with a first lock head 4030 corresponding to the first locking slot 4021. When the metal straight sleeve 403 is inserted into the first groove 4021, the first lock head 4030 and the first locking slot 4021 are locked.

[0015] The outer wall of the metal sleeve 403 is provided with a first locking notch 4031, which is located behind the first lock head 4030. The inner wall of the first groove 4020 is provided with a first locking protrusion 4022, which is provided with a first inclined surface 4023. When the first lock head 4030 and the first lock mouth 4021 are locked, the first locking protrusion 4022 is engaged in the first locking notch 4031.

[0016] Preferably, the front end of the metal sleeve 403 is provided with a second groove 4032; a spring 4033 is provided in the second groove 4032, and the two ends of the spring 4033 abut against the bottom of the first groove 4020 and the bottom of the second groove 4032, respectively.

[0017] A connecting sleeve 4034 is provided at the coupling ends of the first encapsulation core 404 and the second encapsulation core 405. The connecting sleeve 4034 is wrapped around the outside of the first encapsulation core 404 and the second encapsulation core 405, and the connecting sleeve 4034 is located inside the hollow part of the middle of the spring 4033.

[0018] The bottom of the first groove 4020 is provided with a first circular groove 4024, and the distance between the bottom of the first circular groove 4024 and the bottom of the second groove 4032 matches the length of the connecting sleeve 4034.

[0019] Preferably, the outer frame 401 has skylights 4010 on both sides; the inner frame 402 has a second locking protrusion 4025 on its outer side wall, the second locking protrusion 4025 being located on two opposite outer sides of the inner frame 402 and inside the skylights 4010; the outer frame 401 has a third locking protrusion 4011 on its inner side wall, corresponding to the second locking protrusion 4025, the third locking protrusion 4011 being symmetrically arranged on two opposite inner sides of the outer frame 401.

[0020] The outer side of the inner frame sleeve 402 is provided with a stop protrusion 4026, which is located in front of the second locking protrusion 4025.

[0021] The outer frame 401 and the inner frame 402 are movable relative to each other. When the outer frame 401 moves to the first limit position, the second locking protrusion 4025 abuts against the third locking protrusion 4011. When the outer frame 401 moves to the second limit position, the crossbeam on one side of the sunroof 4010 abuts against the stop protrusion 4026.

[0022] Preferably, the fiber optic ferrule 4 further includes a tail sleeve 406, which is snapped into the tail of the metal straight sleeve 403. The grating fiber core 400 is located at the central axis of the tail sleeve 406, and the grating fiber core 400 is coupled to the first encapsulation ferrule 404.

[0023] The tail of the metal sleeve 403 is provided with an annular groove 4035, and the front end of the tail sleeve 406 is provided with a fourth locking protrusion 4060, which is engaged and fixed with the annular groove 4035.

[0024] In a second aspect, the present invention provides an optical module with a single-fiber bidirectional device that reflects a specific wavelength band, including the single-fiber bidirectional device with a specific wavelength band as described in the first aspect.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: By setting a grating fiber core 400 inside the pigtail pin 4, the present invention enables light of a specific wavelength to be reflected at the grating fiber core 400 after the transmitting TO-CAN1 sends an optical signal to the pigtail pin 4, and reflected back into the receiving TO-CAN2. This overcomes the problem that single-fiber bidirectional devices in the prior art do not have the function of reflecting specific wavelengths and cannot selectively reflect or transmit according to the wavelength of the optical signal. Furthermore, by integrating the grating function into the pigtail pin 4, the reflected light loss is small, the integration is high, and the size is smaller. It is compatible with existing traditional single-fiber bidirectional device production platforms and the process is simple. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments of the present invention will be briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0027] Figure 1 This is a schematic diagram of the overall structure of a single-fiber bidirectional device with specific wavelength band reflection provided in an embodiment of the present invention;

[0028] Figure 2 This invention provides a single-fiber bidirectional device with specific wavelength band reflection. Figure 1 A sectional view;

[0029] Figure 3 This is a cross-sectional view of a pigtail ferrule of a single-fiber bidirectional device with specific wavelength reflection provided in an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of a teardrop cap for a single-fiber bidirectional device with specific wavelength reflection provided in an embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram showing the structural details of a pigtail ferrule for a single-fiber bidirectional device with specific wavelength reflection provided in an embodiment of the present invention.

[0032] Figure 6 This is a schematic diagram of the inner frame of a single-fiber bidirectional device with specific wavelength band reflection provided in an embodiment of the present invention;

[0033] Figure 7 This is a schematic diagram of a metal sleeve for a single-fiber bidirectional device with specific wavelength band reflection provided in an embodiment of the present invention;

[0034] Figure 8 This is a schematic diagram of the first circular groove of a single-fiber bidirectional device with specific band reflection provided in an embodiment of the present invention;

[0035] Figure 9 This is a schematic diagram of a skylight of a single-fiber bidirectional device with specific wavelength band reflection provided in an embodiment of the present invention;

[0036] Figure 10 This invention provides a single-fiber bidirectional device with specific wavelength band reflection. Figure 9 A sectional view;

[0037] Figure 11 This is a schematic diagram of the second locking protrusion of a single-fiber bidirectional device with specific band reflection provided in an embodiment of the present invention;

[0038] Figure 12 This is a schematic diagram of the skylight and stop protrusion abutting against each other in a single-fiber bidirectional device with specific band reflection provided in an embodiment of the present invention;

[0039] Figure 13 This is a schematic diagram of the tail sleeve of a single-fiber bidirectional device with specific band reflection provided in an embodiment of the present invention;

[0040] Figure 14 This is a schematic diagram of the TO package structure of a single-fiber bidirectional device with specific band reflection provided in an embodiment of the present invention.

[0041] The accompanying diagram is described as follows:

[0042] 1-Transmit TO-CAN, 2-Receive TO-CAN, 3-Integrated tube, 300-Beam splitter, 301-Filter, 302-Metal sleeve, 303-Through slot, 4-Pigtail pin, 400-Raster fiber core, 401-Outer frame, 4010-Skylight, 4011-Third locking protrusion, 4012-Second bevel, 4013-Notch area, 402-Inner frame, 4020-First groove, 4021-First locking slot, 4022-First locking protrusion, 402 3-First inclined surface, 4024-First circular groove, 4025-Second locking protrusion, 4026-Stop protrusion, 403-Metal straight sleeve, 4030-First lock head, 4031-First locking notch, 4032-Second groove, 4033-Spring, 4034-Connecting sleeve, 4035-Annular groove, 404-First encapsulation core, 405-Second encapsulation core, 406-Tail sleeve, 4060-Fourth locking protrusion, 407-Fiber optic tail, 5-Teardrop cap, 50-Spherical lens. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0044] Unless the context otherwise requires, throughout the specification and claims, the term "comprising" is interpreted as openly inclusive, meaning "including, but not limited to." In the description of the specification, terms such as "one embodiment," "some embodiments," "exemplary embodiment," "example," "specific example," or "some examples" are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this disclosure. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics mentioned may be included in any suitable manner in any one or more embodiments or examples; that is, although they may be incorporated into embodiments or examples using the above terms for reasons such as order and position, it does not limit them to be incorporated in combination by a single embodiment or example.

[0045] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0046] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this disclosure, unless otherwise stated, "a plurality of" means two or more. Furthermore, for example, the description may use the prefix "A" or "B" to describe the same type of nouns as two independent entities. In this case, the corresponding features defined with "A" and "B" are used only to distinguish between similar entities and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0047] In describing some embodiments, the terms "coupled," "coupled," and "connected," and their derivative expressions, may be used. For example, the term "connected" may be used in describing some embodiments to indicate that two or more components have direct physical or electrical contact with each other. Similarly, the term "coupled" may be used in describing some embodiments to indicate that two or more components have direct physical or electrical contact. However, the terms "connected" or "coupled" may also refer to two or more components that do not have direct contact with each other but still cooperate or interact with each other, such as "optical coupling," "wireless connection," etc. The embodiments disclosed herein are not necessarily limited to the scope of this invention.

[0048] In the description of this invention, the expression “A and / or B” (where A and B are used to formally represent specific features) will be used. The corresponding expression includes the following three combinations: only A, only B, and a combination of A and B.

[0049] As used in this invention, “about,” “approximately,” or “approximately” includes the stated value and the average value within an acceptable range of deviation from a particular value, wherein the acceptable range of deviation is determined by a person skilled in the art taking into account the measurement under discussion and the error associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

[0050] Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0051] Example 1:

[0052] Embodiment 1 of the present invention provides a single-fiber bidirectional device with reflection in a specific wavelength band, such as... Figure 1As shown, the device includes: a transmitting TO-CAN1, a receiving TO-CAN2, an integrated tube 3, and a pigtail pin 4. The transmitting TO-CAN1 is coupled to one end of the integrated tube 3, the receiving TO-CAN2 is coupled to the side of the integrated tube 3, and the pigtail 407 end of the pigtail pin 4 is coupled to the other end of the integrated tube 3. The transmitting TO-CAN1 is the component responsible for generating optical signals, typically containing a light source (such as a laser) and related driving circuitry, capable of converting electrical signals into optical signals and transmitting them through an optical fiber to the pigtail pin 4. The receiving TO-CAN2 is responsible for receiving optical signals of a specific wavelength reflected from the pigtail pin 4 and converting them into electrical signals for subsequent processing. To ensure the reliability of the optical device during operation, the integrated tube 3 is made of corrosion-resistant, high-temperature-resistant, and highly conductive materials to ensure normal operation in various harsh environments.

[0053] like Figure 2 As shown, a beam splitter 300 and a filter 301 are provided at the central axis of the integrated tube 3. The beam splitter 300 is used to reflect the light returned from the pigtail pin 4 into the receiver TO-CAN2; the filter 301 is provided at the light inlet of the receiver TO-CAN2. Among them, the beam splitter 300 can be a 45° beam splitter (45° means that the beam splitter is placed at 45° relative to the horizontal plane). The 45° beam splitter can reflect light of a specific wavelength from the optical signal returned from the pigtail 4 into the receiver TO-CAN2, while the light of other wavelengths is transmitted, thereby realizing the separation of optical signals; the filter 301 can be a 0° filter (0° means that the filter is placed at 0° relative to the horizontal plane). The 0° filter is used to filter out unwanted optical signals and improve the signal-to-noise ratio of the system. In a single-fiber bidirectional device, since the transmitted and received optical signals are transmitted through the same optical fiber, interference is easily generated. The 0° filter can effectively filter out interference signals and ensure that the receiver TO-CAN2 only receives the required optical signal.

[0054] like Figure 3As shown, a grating fiber core 400 is disposed within the pigtail pin 4. The grating fiber core 400 is located at the end of the pigtail pin 4. The grating fiber core 400 is used to reflect light of a specific wavelength in the optical signal transmitted by the transmitting TO-CAN1 into the receiving TO-CAN2. In this embodiment, the process involves etching a grating onto the surface of the fiber core at the end of the pigtail pin 4, so that the optical signal transmitted by the transmitting TO-CAN1 can be reflected first at the grating fiber core 400, reflecting the light of the specific wavelength back to the receiving TO-CAN2 along the original path. For example, in an application scenario, the specific wavelength of light to be reflected back is 1270nm. Ignoring other optical devices, when a mixed-band optical signal is emitted, the 1270nm light in the optical signal is first reflected at the grating fiber core 400, and then transmitted through the pigtail 407 to the 45° beam splitter. The 45° beam splitter can reflect the 1270nm light onto the 0° filter. The 0° filter only allows the 1270nm light to pass through, and finally the 1270nm light enters the receiver TO-CAN2.

[0055] This invention overcomes the problem in the prior art that single-fiber bidirectional devices do not have the function of reflecting specific wavelengths of light and cannot selectively reflect or transmit light according to the wavelength of the light signal after the transmitting TO-CAN1 sends an optical signal to the pigtail 4. Furthermore, by integrating the grating function into the pigtail 4, the reflected light has low light loss, high integration, and smaller size. It is compatible with existing traditional single-fiber bidirectional device production platforms and has a simple process.

[0056] Based on the above-described structure, in order to fully illustrate the technical solution provided by the present invention, the details and reverse engineering of the above structure will be further described below.

[0057] See Figure 1 and Figure 2As shown, a metal sleeve 302 is provided at one end of the integrated tube 3 that is coupled to the fiber optic pin 4. The metal sleeve 302 is fixedly connected to the integrated tube 3. The fiber optic pin 407 of the fiber optic pin 4 is inserted into the metal sleeve 302. The central axis of the metal sleeve 302 is collinear with the central axis of the integrated tube 3. Since the central axis of the metal sleeve 302 is collinear with the central axis of the integrated tube 3, the core of the pigtail 407 is also collinear with the central axis of the integrated tube 3. A through groove 303 is machined at the central axis of the integrated tube 3, and the beam splitter 300 and the filter 301 are disposed in the through groove 303. The center of the beam splitter 300 and the filter 301 coincides with the central axis of the TO cap of the receiving TO-CAN2. The beam splitter 300 is set at a certain angle, and the core of the pigtail 407 is collinear with the center of the beam splitter 300, so that the light returning from the pigtail pin 4 is reflected by the beam splitter 300 into the receiving TO-CAN2.

[0058] In order to minimize optical signal loss during transmission, such as Figure 4 As shown, the TO caps of the transmitting TO-CAN1 and the receiving TO-CAN2 are teardrop caps 5, and a spherical lens 50 is provided at the front end of the teardrop cap 5. The spherical lens 50 is used to focus the optical signal.

[0059] For the fiber optic connector 4, such as Figure 5 As shown, the fiber optic connector 4 includes an outer frame 401, an inner frame 402, and a metal straight sleeve 403. The inner frame 402 and the metal straight sleeve 403 are located inside the outer frame 401, and the inner frame 402 and the metal straight sleeve 403 are coupled and snap-fitted together. A first encapsulation core 404 is provided inside the fiber optic connector 4, and the first encapsulation core 404 is located inside the metal straight sleeve 403. The inner frame 402 is used to allow a second encapsulation core 405 of the external interface to pass through, and the second encapsulation core 405 is coupled to the first encapsulation core 404.

[0060] The inner frame sleeve 402 and the metal straight sleeve 403 are coupled and snap-fitted together, specifically including, for example... Figure 5 and Figure 6 As shown, the coupling end of the inner frame sleeve 402 and the metal straight sleeve 403 is provided with a first groove 4020. The metal straight sleeve 403 is inserted into the first groove 4020 and coupled with the first groove 4020. The two pairs of sidewalls of the first groove 4020 are provided with first locking slots 4021. (See reference...) Figure 5 and Figure 7As shown, the outer wall of the metal sleeve 403 is machined with a first lock head 4030 corresponding to the first lock opening 4021. When the metal sleeve 403 is inserted into the first groove 4020, the first lock head 4030 and the first lock opening 4021 are locked together. In addition, the outer wall of the metal sleeve 403 is machined with a first locking notch 4031, located behind the first lock head 4030. The inner wall of the first groove 4020 is machined with a first locking protrusion 4022, which has a first inclined surface 4023. When the first lock head 4030 and the first lock opening 4021 are locked together, the first locking protrusion 4022 engages with the first locking notch 4031. The first inclined surface 4023 is used to enable the first locking protrusion 4022 to pass over the first lock head 4030 and engage with the first locking notch 4031 during the process of the first locking protrusion 4022 being inserted into the inner frame sleeve 402 and the metal straight sleeve 403.

[0061] Continue reading Figure 5 , Figure 6 and Figure 7 As shown, the front end of the metal sleeve 403 is provided with a second groove 4032, and the first encapsulation core 404 extends from the bottom of the second groove 4032; a spring 4033 is provided in the second groove 4032, and when the metal sleeve 403 is inserted into the first groove 4020, the two ends of the spring 4033 abut against the bottom of the first groove 4020 and the bottom of the second groove 4032, respectively. Specifically, the spring 4033 provides a positive force to the first encapsulated ferrule 404, ensuring better contact between the first encapsulated ferrule 404 and the corresponding second encapsulated ferrule 405 during insertion or connection, thus achieving a stable connection. Secondly, the upward force of the spring 4033 helps maintain the contact interface inside the connector, i.e., the contact surfaces of the first encapsulated ferrule 404 and the second encapsulated ferrule 405, ensuring a tight and stable connection between them during long-term use. This helps reduce signal attenuation or power transmission loss, improving connection reliability and performance. In practical applications, due to factors such as temperature and vibration, the connector interface or the first encapsulated ferrule 404 may experience slight deformation. The elasticity of the spring 4033 can adapt to these deformations to a certain extent, ensuring the connector maintains a good connection state under various environments.

[0062] To further ensure stable contact between the first package ferrule 404 and the second package ferrule 405, please refer to... Figure 5As shown, a connecting sleeve 4034 is provided at the coupling ends of the first encapsulation core 404 and the second encapsulation core 405. The connecting sleeve 4034 wraps around the outside of the first encapsulation core 404 and the second encapsulation core 405, and is located within the hollow center of the spring 4033. The connecting sleeve 4034 is made of metal. Figure 5 , Figure 7 and Figure 8 As shown, a first circular groove 4024 is machined at the bottom of the first groove 4020. When the metal straight sleeve 403 is coupled with the inner frame sleeve 402, the distance between the bottom of the first circular groove 4024 and the bottom of the second groove 4032 matches the length of the connecting sleeve 4034.

[0063] Regarding the fixing between the inner frame sleeve 402 and the outer frame sleeve 401, such as Figure 6 and Figure 9 As shown, skylights 4010 are respectively provided on both sides of the outer frame 401; a second locking protrusion 4025 is machined on the outer side wall of the inner frame 402. The second locking protrusion 4025 is located on two opposite outer sides of the inner frame 402. When the inner frame 402 and the outer frame 401 are coupled and fixed, the second locking protrusion 4025 is located inside the skylight 4010; Figure 10 and Figure 11 As shown, the inner wall of the outer frame 401 is provided with a third locking protrusion 4011 corresponding to the second locking protrusion 4025. The third locking protrusions 4011 are symmetrically arranged on two opposite inner surfaces of the outer frame 401. When the second locking protrusion 4025 is located inside the skylight 4010, the highest point of the second locking protrusion 4025 is higher than the lowest point of the third locking protrusion 4011. The third locking protrusion 4011 is provided with a second inclined surface 4012. When the inner frame 402 and the outer frame 401 are locked, the second locking protrusion 4025 applies an external force to the second inclined surface 4012, causing the second inclined surface 4012 to deform. This increases the distance between the two second inclined surfaces 4012, allowing the third locking protrusion 4011 to pass over the second locking protrusion 4025, so that the vertical surface of the third locking protrusion 4011 abuts against the vertical surface of the second locking protrusion 4025. Specifically, the skylight 4010 has a notch area 4013 to accommodate the shape of the second locking protrusion 4025.

[0064] For easier inspection and maintenance of the 407 pigtail ferrule after installation, please refer to... Figure 6 and Figure 11As shown, a stop protrusion 4026 is machined on the outer side of the inner frame sleeve 402. The stop protrusion 4026 is located in front of the second locking protrusion 4025, as shown. Figure 12 As shown, the outer frame 401 and the inner frame 402 are movable relative to each other. When the outer frame 401 moves to the first limit position, the second locking protrusion 4025 abuts against the third locking protrusion 4011; when the outer frame 401 moves to the second limit position, the crossbeam on one side of the skylight 4010 (such as...) Figure 11 The dotted line indicates that the stop protrusion 4026 is in contact with the stop protrusion 4026. The distance L1 between the front end face of the stop protrusion 4026 and the rear end face of the second locking protrusion 4025 is less than the length L2 of the sunroof 4010, so that the outer frame 401 can move relative to the inner frame 402. The distance that can be moved relative to each other is the difference between the length L2 and L1 of the sunroof 4010.

[0065] In addition to the above structure, for the installation of the grating fiber core 400, such as Figure 13 As shown, the fiber optic ferrule 4 also includes a tail sleeve 406, which engages with the tail of the metal straight sleeve 403. The grating fiber core 400 is located at the central axis of the tail sleeve 406 and is coupled to the first encapsulation ferrule 404. Due to the extremely small diameter of the grating fiber core 400, the tail sleeve 406 provides support and protection for its installation, ensuring that even if the fiber optic ferrule 407 bends during use, the grating fiber core 400 will not break or detach from the first encapsulation ferrule 404 after coupling with the first encapsulation ferrule 404. Furthermore, see [reference needed]. Figure 7 and Figure 13 As shown, the tail of the metal sleeve 403 is provided with an annular groove 4035, and the front end of the tail sleeve 406 is provided with a fourth locking protrusion 4060, which is engaged and fixed with the annular groove 4035.

[0066] The TO-CAN2 receiver mentioned in this embodiment can be as follows: Figure 14 The structure shown is as follows. An optical chip 6 for receiving optical signals, along with other related components such as a high-voltage capacitor and a transimpedance amplifier, are disposed on the upper surface of its TO socket. Of course, the transmitting TO-CAN1 can also be as follows: Figure 14 A similar structure can be designed based on the corresponding optical and circuit structures of the TO-CAN1 transmitter.

[0067] Example 2:

[0068] This invention provides an optical module with a single-fiber bidirectional device for specific wavelength band reflection, based on Embodiment 1. The optical module includes the single-fiber bidirectional device for specific wavelength band reflection described in Embodiment 1. Therefore, it also possesses all the advantages of the aforementioned optical devices, enabling the optical module with the single-fiber bidirectional device for specific wavelength band reflection to selectively reflect or transmit light signals according to their wavelength.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A single-fiber bidirectional device with reflection in a specific wavelength band, characterized in that, include: Transmitting TO-CAN (1), receiving TO-CAN (2), integrated tube (3) and pigtail pin (4); the transmitting TO-CAN (1) is coupled to one end of the integrated tube (3), the receiving TO-CAN (2) is coupled to the side of the integrated tube (3), and the end of the pigtail (407) of the pigtail pin (4) is coupled to the other end of the integrated tube (3); A beam splitter (300) and a filter (301) are provided at the central axis of the integrated tube (3). The beam splitter (300) is used to reflect the light returned from the pigtail pin (4) into the receiving TO-CAN (2). The filter (301) is provided at the light inlet of the receiving TO-CAN (2). The pigtail pin (4) is provided with a grating fiber core (400), which is located at the end of the pigtail pin (4). The transmitting TO-CAN (1) transmits a mixed-band optical signal, and the grating fiber core (400) is used to reflect light of a specific wavelength in the optical signal transmitted by the transmitting TO-CAN (1) into the receiving TO-CAN (2).

2. The single-fiber bidirectional device with specific band reflection according to claim 1, characterized in that, A metal sleeve (302) is provided at one end of the integrated tube (3) coupled to the fiber optic pin (4). The metal sleeve (302) is fixedly connected to the integrated tube (3). The fiber optic pin (407) of the fiber optic pin (4) is inserted into the metal sleeve (302). The central axis of the metal sleeve (302) is collinear with the central axis of the integrated tube (3).

3. The single-fiber bidirectional device with specific wavelength band reflection according to claim 2, characterized in that, A through groove (303) is machined at the central axis of the integrated tube (3), and the beam splitter (300) and the filter (301) are disposed in the through groove (303). The center of the beam splitter (300) and the filter (301) coincides with the central axis of the TO cap of the receiving TO-CAN (2). The beam splitter (300) is set at a certain angle. The fiber core of the pigtail (407) is collinear with the center of the beam splitter (300) so that the light returned from the pigtail pin (4) is reflected by the beam splitter (300) into the receiving TO-CAN (2).

4. The single-fiber bidirectional device with specific wavelength band reflection according to claim 3, characterized in that, The TO caps of the transmitting TO-CAN (1) and the receiving TO-CAN (2) are teardrop caps (5), and a spherical lens (50) is provided at the front end of the teardrop cap (5). The spherical lens (50) is used to converge the optical signal.

5. The single-fiber bidirectional device with specific band reflection according to claim 1, characterized in that, The pigtail pin (4) includes an outer frame sleeve (401), an inner frame sleeve (402), and a metal straight sleeve (403). The inner frame sleeve (402) and the metal straight sleeve (403) are located inside the outer frame sleeve (401). The inner frame sleeve (402) and the metal straight sleeve (403) are coupled and snapped together. The fiber optic pin (4) is provided with a first encapsulation core (404) inside, which is located inside the metal sleeve (403); the inner frame sleeve (402) is used to allow the second encapsulation core (405) of the external interface to pass through, and the second encapsulation core (405) is coupled to the first encapsulation core (404).

6. The single-fiber bidirectional device with specific band reflection according to claim 5, characterized in that, The inner frame sleeve (402) and the metal straight sleeve (403) are coupled at the coupling end with a first groove (4020). The metal straight sleeve (403) is inserted into the first groove (4020) and coupled with the first groove (4020). The two pairs of side walls of the first groove (4020) are provided with first locking holes (4021). The outer side wall of the metal straight sleeve (403) is machined with a first lock head (4030) corresponding to the first locking hole (4021). When the metal straight sleeve (403) is inserted into the first groove (4020), the first lock head (4030) and the first locking hole (4021) are locked. The outer wall of the metal sleeve (403) is provided with a first locking notch (4031), which is located on the rear side of the first lock head (4030). The inner wall of the first groove (4020) is provided with a first locking protrusion (4022), which is provided with a first inclined surface (4023). When the first lock head (4030) and the first lock mouth (4021) are locked, the first locking protrusion (4022) is engaged in the first locking notch (4031).

7. The single-fiber bidirectional device with specific band reflection according to claim 6, characterized in that, The front end of the metal sleeve (403) is provided with a second groove (4032); a spring (4033) is provided in the second groove (4032), and the two ends of the spring (4033) abut against the bottom of the first groove (4020) and the bottom of the second groove (4032) respectively; A connecting sleeve (4034) is provided at the coupling end of the first encapsulation core (404) and the second encapsulation core (405). The connecting sleeve (4034) is wrapped around the outside of the first encapsulation core (404) and the second encapsulation core (405). The connecting sleeve (4034) is located inside the hollow part of the spring (4033). The bottom of the first groove (4020) is provided with a first circular groove (4024), and the distance between the bottom of the first circular groove (4024) and the bottom of the second groove (4032) matches the length of the connecting sleeve (4034).

8. The single-fiber bidirectional device with specific wavelength band reflection according to claim 5, characterized in that, The outer frame (401) has skylights (4010) on both sides; the outer side wall of the inner frame (402) is provided with a second locking protrusion (4025), which is located on two opposite outer sides of the inner frame (402) and is located inside the skylight (4010); the inner side wall of the outer frame (401) is provided with a third locking protrusion (4011) corresponding to the second locking protrusion (4025), which is symmetrically arranged on two opposite inner sides of the outer frame (401). The outer side of the inner frame sleeve (402) is provided with a stop protrusion (4026), which is located in front of the second locking protrusion (4025); The outer frame sleeve (401) and the inner frame sleeve (402) are movable relative to each other. When the outer frame sleeve (401) moves to the first limit position, the second locking protrusion (4025) abuts against the third locking protrusion (4011); when the outer frame sleeve (401) moves to the second limit position, the crossbeam on one side of the skylight (4010) abuts against the stop protrusion (4026).

9. The single-fiber bidirectional device with specific wavelength band reflection according to claim 5, characterized in that, The fiber optic ferrule (4) also includes a tail sleeve (406), which is snapped into the tail of the metal straight sleeve (403). The grating fiber core (400) is located at the central axis of the tail sleeve (406), and the grating fiber core (400) is coupled to the first encapsulation ferrule (404). The tail of the metal sleeve (403) is provided with an annular groove (4035), and the front end of the tail sleeve (406) is provided with a fourth locking protrusion (4060). The fourth locking protrusion (4060) is engaged and fixed with the annular groove (4035).

10. An optical module with a single-fiber bidirectional device that reflects a specific wavelength band, characterized in that, Includes the single-fiber bidirectional device with specific band reflection as described in any one of claims 1-9.

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