Light splitting assembly for optical device, optical device shell and coaxial narrow-band single-fiber four-way optical device

Abstract

The utility model belongs to the technical field of optical communication, and particularly provides a light splitting assembly for an optical device, an optical device shell and a coaxial narrow-band single-fiber four-way optical device. The light splitting assembly for the optical device comprises a first reflecting prism, a second reflecting prism and a rhombic prism, the first surface of the rhombic prism is provided with a first filter and a second filter; a third filter is arranged on the second surface of the rhombic prism; the third filter is located on a reflection light path of the first filter; the second filter is located on a reflection light path of the third filter; the first reflecting prism is located on a transmission light path of the second filter; and the second reflecting prism is positioned on a transmission light path of the third filter. A parallel light input and output design is adopted, wavelength division of a transmitting end and a receiving end is facilitated, narrow-band light splitting of a light path of the receiving end is realized, and energy loss is reduced. The shell based on the light splitting assembly and the optical path structure of the optical device are highly integrated, and the requirements for miniaturization packaging of the optical device and coexistence of a 25G PON mode and an existing PON mode are met.

Description

Technical Field

[0001] This utility model belongs to the field of optical communication technology, specifically relating to a beam splitter for optical devices, an optical device housing, and a coaxial narrowband single-fiber four-way optical device. Background Technology

[0002] As the next-generation PON technology, 25G PON has made significant progress in standardization, technology research and development, and commercial deployment. In the future, with technological advancements and cost reductions, 25G PON will play a crucial role in 5G, enterprise leased lines, and other fields, driving the development of global bandwidth networks. To ensure compatibility with existing PON networks and a smooth transition to 25G PON, an optical device needs to be designed to allow existing PON (10G PON or 1G PON) and 25G PON to coexist, achieving narrowband wavelength division multiplexing of 25G PON uplink transmission wavelengths (1284~1288nm) and 10G PON uplink transmission wavelengths (1260~1280nm) (1G PON uplink transmission wavelengths (1290~1330nm)). Utility Model Content

[0003] The purpose of this invention is to achieve coexistence of 25G PON and existing PON modes on coaxial optical devices, while meeting the requirements for narrowband wavelength division and isolation.

[0004] To address this, the present invention provides a beam splitting assembly for optical devices, comprising a first reflecting prism, a second reflecting prism, and an orthographic prism; a first filter and a second filter are disposed on a first surface of the orthographic prism; a third filter is disposed on a second surface of the orthographic prism; the third filter is located in the reflected light path of the first filter; the second filter is located in the reflected light path of the third filter; the first reflecting prism is located in the transmitted light path of the second filter; and the second reflecting prism is located in the transmitted light path of the third filter.

[0005] This utility model also provides an optical device housing, including a housing body with a mirror cavity and a beam splitter assembly for the aforementioned optical device; the beam splitter assembly is installed inside the mirror cavity; the housing body is provided with an optical port, a first optical receiving port, a second optical receiving port, a first optical emitting port, and a second optical emitting port; a beam combining unit is installed inside the mirror cavity; the beam combining unit is used to combine the light entering through the first optical emitting port and the second optical emitting port into an outgoing beam combining light; the first filter of the beam splitter assembly is located on the optical path of the outgoing beam combining light; the optical port is located on the transmission optical path of the first filter; the first optical receiving port is located on the reflection optical path of the first reflecting prism; the second optical receiving port is located on the reflection optical path of the second reflecting prism.

[0006] Specifically, a converging lens is provided between the aforementioned beam splitter and the optical port; the converging lens is located on the transmission light path of the first filter.

[0007] Specifically, the aforementioned beam combining unit includes a fourth filter; one side of the fourth filter facing the beam splitter is used to reflect the incident light, and the other side of the fourth filter is used to transmit the incident light.

[0008] Specifically, the aforementioned mirror cavity is provided with a sloping groove for placing the fourth filter.

[0009] Specifically, an optical isolator is provided on the optical path between the aforementioned beam combining unit and the beam splitting component.

[0010] Specifically, a collimating lens is provided in the optical path between the optical isolator and the beam splitter.

[0011] Specifically, the aforementioned beam splitting component is fixed on the base plate, which is installed inside the mirror cavity of the housing body.

[0012] This utility model also provides a coaxial narrowband single-fiber four-way optical device, including a first emitting laser, a second emitting laser, a first receiving detector, a second receiving detector, and a housing of the optical device; the first emitting laser and the second emitting laser are respectively mounted on the housing body through a first optical emitting port and a second optical emitting port; the first receiving detector and the second receiving detector are respectively mounted on the housing body through a first optical receiving port and a second optical receiving port.

[0013] Specifically, a first receiving 0° filter is provided between the first receiving detector and the first reflecting prism; a second receiving 0° filter is provided between the second receiving detector and the second reflecting prism.

[0014] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0015] The optical device beam splitter provided by this utility model adopts a parallel light input / output design, which facilitates wavelength division between the transmitting and receiving ends, effectively achieving narrowband beam splitting in the receiving optical path, reducing energy loss, and simplifying the fabrication of the beam splitter. Based on the highly integrated housing and coaxial narrowband single-fiber four-way optical path structure of this beam splitter, a small-volume design was achieved through optical simulation, ensuring that the optical path is not obstructed, the ports are unaffected, and the structure is reliable. This meets the technical requirements of miniaturized packaging design for optical devices and coexistence of 25G PON and existing PON dual-mode.

[0016] The present invention will be further described in detail below with reference to the accompanying drawings. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the beam splitter structure for optical devices provided by this utility model;

[0018] Figure 2 This is a schematic diagram of the internal optical path of the optical device housing provided by this utility model;

[0019] Figure 3 This is a structural diagram of the cover plate of the optical device housing provided by this utility model;

[0020] Figure 4 This is an external axonometric view of the optical device provided by this utility model;

[0021] Figure 5 This is a diagram of the internal structure of the optical device provided by this utility model;

[0022] Figure 6 This is a schematic diagram of the optical path of the first emitting laser provided by this utility model;

[0023] Figure 7 This is a schematic diagram of the optical path of the second emitting laser provided by this utility model;

[0024] Figure 8 This is a schematic diagram of the optical path of the first receiving detector provided by this utility model;

[0025] Figure 9 This is a schematic diagram of the optical path of the second receiving detector provided by this utility model;

[0026] Explanation of reference numerals in the attached drawings: 1. Shell body; 2. First emitting laser; 3. First emitting laser adjustment ring; 4. Second emitting laser; 5. Second emitting laser adjustment ring; 6. 45° filter; 7. Optical isolator; 8. Collimating lens; 9. Beam splitter assembly; 901. First filter; 902. Second filter; 903. Third filter; 904. Orthographic prism; 905. First reflecting prism; 906. Second reflecting prism; 907. Silicon lens; 908. Base plate; 10. Lens support; 11. Converging lens; 12. Optical port adjustment ring; 13. Fiber optic interface assembly; 14. First receiving 0° filter; 15. Second receiving 0° filter; 16. First receiving detector; 17. Second receiving detector; 18. Cover plate. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0028] In the description of this utility model, 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 utility model 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 utility model.

[0029] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0030] Reference Figure 1 This invention provides a beam splitter assembly 9 for optical devices, including a first reflecting prism 905, a second reflecting prism 906, and an orthorhombic prism 904. A first filter 901 and a second filter 902 are disposed on the first surface of the orthorhombic prism 904, and a third filter 903 is disposed on the second surface of the orthorhombic prism 904. At least one face of the filter is in contact with a corresponding surface of the orthorhombic prism 904. The second surface is preferably parallel to the first surface. The third filter 903 is located in the reflected light path of the first filter 901; the second filter 902 is located in the reflected light path of the third filter 903; the first reflecting prism 905 is located in the transmitted light path of the second filter 902; and the second reflecting prism 906 is located in the transmitted light path of the third filter 903. The beam splitter assembly 9 adopts a parallel light input / output design, which facilitates wavelength division between the transmitting and receiving ends, effectively achieving narrowband beam splitting in the receiving end optical path, reducing energy loss, and simplifying the fabrication of the beam splitter assembly 9. A silicon lens 907 can also be installed on the reflected light path of the second reflecting prism 906. The adaptive wavelength of each filter in the beam splitter 9 is designed according to the actual incident wavelength requirements to ensure that each incident wave can be emitted from the corresponding filter to the corresponding receiver.

[0031] Reference Figure 2This utility model also provides an optical device housing, including a housing body 1 with a mirror cavity and a beam splitter 9 for the aforementioned optical device; the beam splitter 9 is installed inside the mirror cavity; the housing body 1 is provided with an optical port, a first optical receiving port, a second optical receiving port, a first optical emitting port, and a second optical emitting port; a beam combining unit is installed inside the mirror cavity; the beam combining unit is used to combine the light entering through the first optical emitting port and the second optical emitting port into an outgoing beam; the first filter 901 of the beam splitter 9 is located on the optical path of the outgoing beam; the optical port is located on the transmission optical path of the first filter 901; the first optical receiving port is located on the reflection optical path of the first reflecting prism 905; the second optical receiving port is located on the reflection optical path of the second reflecting prism 906. Preferably, the beam splitter 9 is fixed on a base plate 908, which is installed inside the mirror cavity of the housing body 1, reducing the difficulty of processing and assembly and ensuring product performance. The housing body 1 serves as the assembly carrier for each optical component, ensuring the integration of two-mode 25G PON optical devices.

[0032] Furthermore, a converging lens 11 is provided between the beam splitter 9 and the optical port; the converging lens 11 is located in the transmission optical path of the first filter 901. The beam combining unit combines the light entering from the first and second optical emission ports, transmits it through the beam splitter 9 to the converging lens 11, and the converging lens 11 converges the outgoing combined light before transmitting it to the optical port for output. Alternatively, the converging lens 11 converts the diverging light of multiple wavelengths emitted from the optical port into parallel light and transmits it to the beam splitter 9. The first filter 901, the second filter 902, and the third filter 903 of the beam splitter 9 reflect / transmit the parallel light of the corresponding wavelengths to the corresponding first reflecting prism 905 or second reflecting prism 906, and the reflecting prism reflects the received parallel light to the corresponding optical receiving port.

[0033] In a refined embodiment, the lens converts the first diverging light of 1270nm wavelength emitted from the optical port into first parallel light and transmits it to the beam splitter 9. After secondary reflection by the first filter 901 and the third filter 903 of the beam splitter 9, it is transmitted through the second filter 902 to the first reflecting prism 905. The first reflecting prism 905 reflects the first parallel light to the first optical receiving port. The lens converts the second diverging light of 1286nm wavelength emitted from the optical port into second parallel light and transmits it to the beam splitter 9. After reflection by the first filter 901 and the third filter 903 of the beam splitter 9, it is transmitted to the second reflecting prism 906. The second reflecting prism 906 reflects the second parallel light to the second optical receiving port.

[0034] Preferably, the converging lens 11 is fixed on the lens bracket 10, and the lens bracket 10 is installed inside the lens cavity of the housing body 1, which facilitates the assembly of the converging lens 11 and reduces the difficulty of the process.

[0035] Specifically, the beam combining unit includes a fourth filter; one side of the fourth filter facing the beam splitter 9 reflects the incident light, while the other side transmits the incident light. The fourth filter is preferably a 45° filter 6, tilted away from the optical port end, used to transmit light entering through the first optical emission port in the first wavelength range to the beam splitter 9 and to reflect light entering through the second optical emission port in the second wavelength range to the beam splitter 9, thus achieving beam combining.

[0036] Furthermore, the mirror cavity is provided with a sloping groove for placing the fourth filter. The fourth filter is bonded in the sloping groove to prevent light entering from the first optical emission port from being directly reflected from inside the housing to the second optical emission port, causing crosstalk and affecting the signal transmission of the second laser.

[0037] In an optimized implementation, an optical isolator 7 is provided on the optical path between the multiplexing unit and the beam splitting component 9. The optical isolator 7 is used for unidirectional transmission of light entering the first and second optical emission ports, preventing light from being reflected back to the laser, interfering with its stability, and ensuring the transmission quality of the optical signal.

[0038] Furthermore, a collimating lens 8 is provided in the optical path between the optical isolator 7 and the beam splitter 9. The collimating lens 8 is used to convert the light beams entering the first and second light emission ports into parallel light outputs, which facilitates optical path transmission and reduces energy loss.

[0039] Preferably, the optical parameters of the collimating lens 8 and the converging lens 11 are designed to be matched, which can effectively improve the coupling efficiency between the transmitter and receiver.

[0040] like Figure 1 and Figure 3 As shown, the side wall of the housing body 1 is provided with a cover plate port for making way for the installation of the beam splitter 9. A cover plate 18 is fixed at the cover plate port to seal the cover plate port, preventing external impurities from entering the housing and affecting the optical path of the device, thus ensuring the stability of the optical device.

[0041] Reference Figure 4-5This utility model also provides a coaxial narrowband single-fiber four-way optical device, including a first emitting laser 2, a second emitting laser 4, a first receiving detector 16, a second receiving detector 17, and a housing of the aforementioned optical device; the first emitting laser 2 and the second emitting laser 4 are respectively mounted on the housing body 1 through a first optical emission port and a second optical emission port; the first receiving detector 16 and the second receiving detector 17 are respectively mounted on the housing body 1 through a first optical receiving port and a second optical receiving port. A beam combiner transmits the first light emitted by the first emitting laser 2 to a beam splitter 9 and reflects the second light emitted by the second emitting laser 4 to the beam splitter 9; the beam splitter 9 transmits the first and second light to a converging lens 11; the converging lens 11 converges the first and second light and transmits it to the output of the optical port, or converts multiple wavelengths of light emitted from the optical port into parallel light and transmits it to the beam splitter 9, which then splits the two narrowband wavelength beams at the receiving end to the first receiving detector 16 and the second receiving detector 17.

[0042] In a detailed embodiment, the first emitting laser 2 is used to emit parallel light with a first wavelength (1358nm), and the second emitting laser 4 is used to emit parallel light with a second wavelength (1577nm) and a third wavelength (1490nm). The first wavelength is located within the first wavelength range and is transmitted to the beam splitter 9 through the beam combining unit. The second and third wavelengths are located within the second wavelength range and are reflected to the beam splitter 9 through the beam combining unit.

[0043] Preferably, the first emitting laser 2, the second emitting laser 4, the first receiving detector 16, and the second receiving detector 17 are all coaxial TO packages, which have good hermeticity and ensure that external moisture and other gases cannot enter the TO package and affect the chip performance, thus guaranteeing the long-term reliability of the product. This effectively focuses the laser light output, reducing energy loss in the output power.

[0044] Furthermore, a first laser emitter adjustment ring 3 is connected between the first laser emitter 2 and the housing body 1, and a second laser emitter adjustment ring 5 is connected between the second laser emitter 4 and the housing body 1. An optical port adjustment ring 12 is provided at the optical port end of the housing body 1. These adjustment rings are used to couple and fix the corresponding laser emitter and fiber optic interface assembly 13 to the housing, adjust the optical path matching of the structure, and ensure the stability of the optical devices.

[0045] Specifically, a first receiving 0° filter 14 is provided between the first receiving detector 16 and the first reflecting prism 905; a second receiving 0° filter 15 is provided between the second receiving detector 17 and the second reflecting prism 906. The receiving 0° filters are used by the first receiving detector 16 and the second receiving detector 17 to receive light of the corresponding wavelengths and to cut off light of other wavelengths, ensuring optical isolation at the receiving end and preventing light from the transmitting end from entering the detector and causing optical crosstalk. Example 1

[0046] Reference Figure 1 This embodiment provides a beam splitter assembly 9 for optical devices, including a base plate 908 and a first reflecting prism 905, a second reflecting prism 906, an orthographic prism 904, and a silicon lens 907 mounted on the base plate 908. A first filter 901 and a second filter 902 are disposed on the first surface of the orthographic prism 904; a third filter 903 is disposed on the second surface of the orthographic prism 904; the second surface is parallel to the first surface; the third filter 903 is located in the reflected light path of the first filter 901; the second filter 902 is located in the reflected light path of the third filter 903; the first reflecting prism 905 is located in the transmitted light path of the second filter 902; the second reflecting prism 906 is located in the transmitted light path of the third filter 903; and the silicon lens 907 is disposed in the reflected light path of the second reflecting prism 906.

[0047] This embodiment also provides an optical device housing, including a housing body 1 with a mirror cavity; the housing body 1 is an assembly integrating six ports, which is provided with an optical port, a first optical receiving port, a second optical receiving port, a first optical emitting port, a second optical emitting port and a cover plate port; a beam combiner unit, an optical isolator 7, a collimating lens 8, a beam splitter 9 and a converging lens 11 are installed sequentially along the optical path inside the mirror cavity.

[0048] The beam combiner unit is a 45° filter 6, which is tilted away from the optical port end. The mirror cavity has a sloping groove at the bottom of the bonding point of the 45° filter 6. The 45° filter 6 is bonded in the sloping groove and is located at the intersection of the optical paths of the light entering through the first optical emission port and the second optical emission port. The beam combines the light entering through the first optical emission port and the second optical emission port into the outgoing beam.

[0049] The beam splitter 9 is the beam splitter 9 used in the aforementioned optical device, and is installed in the mirror cavity of the housing body 1 via the base plate 908; the optical isolator 7, the collimating lens 8, and the first filter 901 of the beam splitter 9 are sequentially arranged in the optical path of the outgoing combined light emitted by the 45° filter 6; the converging lens 11 is fixed on the lens bracket 10, which is installed in the mirror cavity of the housing body 1, and the converging lens 11 is located in the transmission optical path of the first filter 901 of the beam splitter 9.

[0050] The optical port is located on the transmission optical path of the first filter 901; the first optical receiving port is located on the reflection optical path of the first reflecting prism 905; and the second optical receiving port is located on the reflection optical path of the second reflecting prism 906.

[0051] A cover plate 18 is fixed at the cover plate port to seal the cover plate port.

[0052] This embodiment also provides a coaxial narrowband single-fiber four-way optical device, including a first emitting laser 2, a second emitting laser 4, a first receiving detector 16, a second receiving detector 17, and a housing of the aforementioned optical device. The first emitting laser 2, the second emitting laser 4, the first receiving detector 16, and the second receiving detector 17 are all coaxial TO packages. The first emitting laser 2 and the second emitting laser 4 are respectively coupled to a first optical emitting port and a second optical emitting port via a first emitting laser adjustment ring 3 and a second emitting laser adjustment ring 5, respectively. The first receiving detector 16 and the second receiving detector 17 are respectively mounted on the housing body 1 via a first optical receiving port and a second optical receiving port, and a first receiving 0° filter 14 is provided between the first receiving detector 16 and the first reflecting prism 905; a second receiving 0° filter 15 is provided between the second receiving detector 17 and the second reflecting prism 906; an optical port adjustment ring 12 is provided at the optical port end of the housing body 1.

[0053] The above-mentioned coaxial narrowband single-fiber four-way optical device is assembled using the following steps:

[0054] Step 1: Install the 45° filter 6, optical isolator 7, collimating lens 8, beam splitter 9, lens bracket 10, converging lens 11, first receiving 0° filter 14, and second receiving 0° filter 15 sequentially into the mirror cavity of the housing body 1, and seal the cover plate 18 to assemble it into the first component.

[0055] Step 2: The fiber optic interface assembly 13 and the optical port adjustment ring 12 are coupled and fixed to the optical port end of the first assembly, and assembled into the second assembly.

[0056] Step 3: The first emitting laser 2 and the first emitting laser adjustment ring 3 are coupled and fixed on the second component, and assembled into the third component.

[0057] Step 4: The second laser emitter 4 and the second laser emitter adjustment ring 5 are coupled and fixed to the third component, and assembled into the fourth component.

[0058] Step 5: The first receiving detector 16 is installed on the fourth component and assembled into the fifth component.

[0059] Step 6: The second receiving detector 17 is installed on the fifth component.

[0060] The beam splitter 9, lens bracket 10, converging lens 11, collimating lens 8, optical isolator 7, 45° filter 6, first receiver 0° filter 14, second receiver 0° filter 15, first receiver detector 16, and second receiver detector 17 are bonded using high-reliability epoxy resin adhesive, with shear strength and reliability meeting industry requirements. The cover plate 18 is welded to the housing body 1 using a sealing welding process to ensure product stability. The fiber optic interface assembly 13 is fixed to the optical port adjustment ring 12, the first emitting laser 2 to the first emitting laser adjustment ring 3, and the second emitting laser 4 to the second emitting laser adjustment ring 5 using laser welding, resulting in high structural strength and ensuring the reliability of the optical devices.

[0061] like Figure 6 As shown, the first emitting laser 2 emits a 1358nm focused light that passes through a 45° filter 6 and an optical isolator 7 to a collimating lens 8, which converts the focused light into parallel light for output. After passing through a beam splitter 9, the parallel light is converted into focused light by a converging lens 11 and then output at the optical port.

[0062] like Figure 7 As shown, the second emitting laser 4 emits a 1577nm focused light which is reflected by the 45° filter 6, then to the optical isolator 7, and then to the collimating lens 8, which converts the focused light into parallel light for output. After passing through the beam splitter 9, the parallel light is converted into focused light by the converging lens 11 and enters the optical port for output.

[0063] like Figure 8 As shown, light emitting at 1270nm is converted into first parallel light by the converging lens 11 and transmitted to the beam splitter 9. After being reflected twice by the first filter 901 and the third filter 903 of the beam splitter 9, it is transmitted to the first reflecting prism 905 by the second filter 902. The first reflecting prism 905 reflects the first parallel light to the first receiving 0° filter 14 and then transmits it into the first receiving detector 16.

[0064] like Figure 9 As shown, light emitting at 1286nm is converted into second parallel light by the converging lens 11 and transmitted to the beam splitter 9. The light is then reflected by the first filter 901 of the beam splitter 9 to the third filter 903 and then transmitted to the second reflecting prism 906. The second reflecting prism 906 reflects the second parallel light to the silicon lens 907 and then transmits it through the first receiving 0° filter 14 into the second receiving detector 17.

[0065] The second laser can also emit 1490nm light output, and the second receiver detector 17 can receive 1310nm light input, realizing the coexistence of 25G PON & 10G PON and 25G PON & 1G PON dual modes.

[0066] The above examples are merely illustrative of this utility model and do not constitute a limitation on the scope of protection of this utility model. All designs that are the same as or similar to this utility model are within the scope of protection of this utility model.

Claims

1. An optical device light splitting assembly, characterized by: The first reflective prism (905), the second reflective prism (906) and the rhomboid prism (904) are included; the first filter (901) and the second filter (902) are arranged on the first surface of the rhomboid prism (904); the third filter (903) is arranged on the second surface of the rhomboid prism (904); the third filter (903) is located on the reflection light path of the first filter (901); the second filter (902) is located on the reflection light path of the third filter (903); the first reflective prism (905) is located on the transmission light path of the second filter (902); and the second reflective prism (906) is located on the transmission light path of the third filter (903).

2. An optical device housing, characterized by: The shell body (1) with a mirror cavity and the light device split optical assembly (9) of claim 1 are included; the split optical assembly (9) is installed in the mirror cavity; the shell body (1) is provided with a light port end, a first light receiving port, a second light receiving port, a first light emitting port and a second light emitting port; a combining unit is installed in the mirror cavity; the combining unit is used for combining the light entering through the first light emitting port and the second light emitting port into outgoing combined wave light; the first filter (901) of the split optical assembly (9) is located on the light path of the outgoing combined wave light; the light port end is arranged on the transmission light path of the first filter (901); the first light receiving port is located on the reflection light path of the first reflective prism (905); and the second light receiving port is located on the reflection light path of the second reflective prism (906).

3. The optical device housing of claim 2, wherein: The converging lens (11) is arranged between the split optical assembly (9) and the light port end; and the converging lens (11) is located on the transmission light path of the first filter (901).

4. The optical device housing of claim 2, wherein: The combining unit includes a fourth filter; one filter surface of the fourth filter faces the split optical assembly (9) and is used for reflecting the incident light; and the other filter surface of the fourth filter is used for transmitting the incident light.

5. The optical device housing of claim 4, wherein: The mirror cavity is provided with an inclined groove for placing the fourth filter.

6. The optical device housing of claim 2, wherein: The optical isolator (7) is arranged on the light path between the combining unit and the split optical assembly (9).

7. The optical device housing of claim 6, wherein: The collimating lens (8) is arranged on the light path between the optical isolator (7) and the split optical assembly (9).

8. The optical device housing of claim 2, wherein: The split optical assembly (9) is fixed on a bottom plate, and the bottom plate is installed in the mirror cavity of the shell body (1).

9. A coaxial narrow-band single-fiber four-way optical device, characterized by: The first emitting laser (2), the second emitting laser (4), the first receiving detector (16), the second receiving detector (17) and the optical device shell of any one of claims 2-8 are included; the first emitting laser (2) and the second emitting laser (4) are respectively installed on the shell body (1) through the first light emitting port and the second light emitting port; and the first receiving detector (16) and the second receiving detector (17) are respectively installed on the shell body (1) through the first light receiving port and the second light receiving port.

10. The coaxial narrow-band single-fiber four-way optical device according to claim 9, characterized in that: The first receiving detector (16) is provided with a first receiving 0° filter (14) between the first receiving detector (16) and the first reflecting prism (905); the second receiving detector (17) is provided with a second receiving 0° filter (15) between the second receiving detector (17) and the second reflecting prism (906).

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