Free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing assembly

Abstract

The utility model provides a free-space single-fiber multi-core multichannel optical passive wavelength division multiplexing assembly, which comprises an outer tube body, and a first collimator assembly, a second collimator assembly and a third collimator assembly are arranged in the outer tube body. The free-space single-fiber multi-core multichannel optical passive wavelength division multiplexing assembly provided by the utility model has the advantages of small size, low loss, low cost, high integration and the like, and realizes coupling integration through Gaussian beam coupling by using a single-fiber four-core optical fiber, a conventional small-angle incidence film optical filter and a 45-degree right-angle prism. The optical structure is simple, the insertion loss is low, the cost is low, the coupling process can be achieved by means of the single-fiber three-core splitter and the asymmetric glass tube, the optical fiber transmission efficiency is improved, the cost is effectively saved, and therefore the optical fiber has great economic value and use value.

Description

Technical Field

[0001] This utility model relates to the field of optical fiber communication design technology, and in particular to a free-space single-fiber multi-core multi-channel passive wavelength division multiplexing component. Background Technology

[0002] Passive optical devices are an important component of fiber optic communication equipment and an indispensable part of other fiber optic applications. They are widely used in long-distance communication, local area networks, fiber-to-the-home (FTTH), video transmission, fiber optic sensing, and more. A typical 4-channel passive optical device consists of four cascaded 3-port devices (e.g., ...). Figure 1 (As shown), working principle: The signal is emitted from the COM terminal, for example, wavelengths of 1271 / 1291 / 1311 / 1331. After passing through a 1271 wavelength division multiplexer, wavelength 1271 is separated. The reflected wavelengths 1291 / 1311 / 1331 are separated into 1291 wavelengths after passing through a second 1291 device, then through a third 1311 device, and finally through a 1331 device, separating the 1331 channel wavelength. The second type is the conventional free-space structure, which utilizes the principles of free space and thin-film interference to achieve a 4-channel output passive device. (As shown) Figure 2 (As shown) Working principle: A signal with wavelengths of, for example, 1271 / 1291 / 1311 / 1331 is emitted from the COM terminal. After being collimated by collimator 7, the signal is transmitted to filter 1. Thin-film interference separates the 1271 wavelength and couples it to collimator 8. The 1291 / 1311 / 1331 wavelengths are reflected to filter 2, where the 1291 wavelength is separated and coupled to collimator 5. Similarly, the 1311 wavelength is separated by thin-film interference of filter 3 and transmitted to collimator 6. The 1331 wavelength is transmitted to collimator 9. Existing passive optical devices often have certain shortcomings, such as high cost due to the use of large-angle filters, which limits their use to some extent. Therefore, further improvements are needed. Utility Model Content

[0003] This invention addresses the shortcomings of the prior art by providing a small-sized, low-loss, low-cost, and highly integrated passive wavelength division multiplexing (WDM) component consisting of a single-fiber multi-core multi-channel optical module.

[0004] The technical solution adopted by this utility model to solve the above problems is as follows:

[0005] This utility model provides a free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing component, including an outer tube body, wherein the outer tube body has a first collimator component, a second collimator component and a third collimator component built in.

[0006] Furthermore, the outer tube body includes a glass tube;

[0007] The outer tube body is provided with a first mounting hole 101 and a second mounting hole.

[0008] The first mounting hole and the second mounting hole are located at the same end or different ends of the outer tube.

[0009] Furthermore, the first collimator assembly is installed within the first mounting hole.

[0010] The second mounting hole is provided with a multi-hole tube, and the second collimator assembly and the third collimator assembly are installed in the multi-hole tube.

[0011] Furthermore, the multi-hole tube body is provided with multiple collimator mounting positions for mounting the second collimator assembly and the triple collimator assembly.

[0012] Furthermore, the first collimator assembly includes a collimator unit and a first tube mounted on the end of the collimator unit.

[0013] The first tube body is provided with a first filter and a second filter at its end.

[0014] The first filter and the second filter are perpendicular to the cross-section of the first tube.

[0015] Furthermore, the second collimator assembly includes a collimator unit and a second tube mounted on the end of the collimator unit, the end of the second tube being beveled.

[0016] The second tube is equipped with a third filter at its end.

[0017] The third filter is disposed on the inclined surface of the first tube.

[0018] Furthermore, the third collimator assembly includes a collimator unit and a third tube mounted on the end of the collimator unit.

[0019] The third tube is provided with a fourth filter at its end.

[0020] A prism is provided on one side of the fourth filter.

[0021] Furthermore, the collimator unit includes a collimator tube and a single-fiber pigtail, a single-mode fiber, and a spherical lens installed inside the collimator tube, wherein the single-fiber pigtail, the single-mode fiber, and the spherical lens are connected in one step.

[0022] A method for operating a free-space single-fiber multi-core multi-channel passive wavelength division multiplexing (WDM) component includes the following steps:

[0023] S1: The optical signal emitted from the common port is separated into a transmitted signal and a reflected signal after passing through the first collimator assembly. The reflected signal is coupled into the single-fiber multi-core mode field b, and then the optical signal is transmitted to the optical fiber b through the splitter monitoring.

[0024] S2: The transmitted signal passes through the second filter to separate the reflected signal and the transmitted signal. The reflected signal is transmitted through the first filter and collimator unit, and then coupled into the single-fiber multi-core c-mode field diameter. It is then monitored and transmitted to the optical signal in the fiber c by the splitter.

[0025] S3: After passing through the third filter, the transmitted signal is separated into transmitted and reflected signals. The transmitted signal is then collimated by the second collimator assembly before transmission.

[0026] S4: The reflected signal changes its transmission direction to horizontal through the right-angle prism, and then is transmitted through the fourth filter to the third collimator for coupling transmission.

[0027] The beneficial effects of this utility model are as follows:

[0028] This invention provides a free-space single-fiber multi-core multi-channel passive wavelength division multiplexing (WDM) component with advantages such as small size, low loss, low cost, and high integration. This invention achieves coupling integration by using a single-fiber 4-core optical fiber, a conventional small-angle incident thin-film filter, and a 45-degree right-angle prism through Gaussian beam coupling. The optical structure is simplified, with low insertion loss and low cost. The coupling process can be achieved using a single-fiber 3-core splitter and an asymmetric glass tube. This application not only improves fiber optic transmission efficiency but also effectively saves costs; therefore, this application has significant economic and practical value. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the principle structure of a passive wavelength division multiplexer in the existing technology;

[0030] Figure 2 This is a schematic diagram of another passive wavelength division multiplexer in the existing technology;

[0031] Figure 3 This is a structural diagram of a free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing component according to this utility model;

[0032] Figure 4 This is a cross-sectional view of a free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing component according to this utility model;

[0033] Figure 5 This is a partial cross-sectional view of a free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing component according to this utility model;

[0034] Figure 6This is a diagram of the porous tube structure of a free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing component according to this utility model.

[0035] Figure 7 This is a cross-sectional view of a porous tube body of a free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing component according to this utility model;

[0036] Figure 8 This is a structural diagram of a collimator unit of a free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing component according to this utility model;

[0037] Figure 9 This is a prism structure diagram of a free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing component of this utility model;

[0038] Figure 10 This is a flowchart illustrating the operation of a free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing (WDM) component according to this utility model. Detailed Implementation

[0039] The embodiments of this utility model are described in detail below with reference to the accompanying drawings. The drawings are for reference and illustration only and do not constitute a limitation on the scope of patent protection of this utility model.

[0040] like Figure 1-8 As shown, this utility model provides a free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing component, including an outer tube 1, wherein the outer tube 1 has a first collimator component 2, a second collimator component 3 and a third collimator component 4 built in it.

[0041] In this embodiment, the outer tube 1 is a glass tube;

[0042] The outer tube 1 is provided with a first mounting hole 101 and a second mounting hole 102.

[0043] The first mounting hole 101 and the second mounting hole 102 are located at the same end or different ends of the outer tube 1. In this embodiment, the first mounting hole 101 and the second mounting hole 102 are respectively located at both ends of the outer tube 1.

[0044] In this embodiment, the first collimator assembly 2 is installed in the first mounting hole 101.

[0045] The second mounting hole 102 is provided with a multi-hole tube 103, and the second collimator assembly 3 and the third collimator assembly 4 are installed in the multi-hole tube 103.

[0046] In this embodiment, the multi-hole tube body 103 is provided with multiple collimator mounting positions 104 for mounting the second collimator assembly 3 and the triple collimator assembly 4.

[0047] In this embodiment, the first collimator assembly 2 includes a collimator unit 5 and a first tube 201 installed at the end of the collimator unit 5.

[0048] The first tube body 201 is provided with a first filter 202 and a second filter 203 at its end.

[0049] The first filter 202 and the second filter 203 are perpendicular to the cross-section of the first tube 201. In this embodiment, a first protective sleeve 200 is also fitted over the outside of the first collimator assembly 3.

[0050] In this embodiment, the second collimator assembly 3 includes a collimator unit 5 and a second tube 301 installed at the end of the collimator unit 5, wherein the end of the second tube 301 is a bevel.

[0051] The second tube 301 is provided with a third filter 302 at its end.

[0052] The third filter 302 is disposed on the inclined surface of the first tube 201. In this embodiment, a second protective sleeve 200 is also sleeved on the outside of the second collimator assembly 3.

[0053] In this embodiment, the third collimator assembly 4 includes a collimator unit 5 and a third tube 6 installed at the end of the collimator unit 5.

[0054] The third tube 6 is provided with a fourth filter 7 at its end.

[0055] A prism body 8 is provided on one side of the fourth filter 7. In this embodiment, a third protective sleeve 300 is also sleeved on the outside of the third collimator assembly 3. In this embodiment, anti-reflection films 803 are respectively provided on the first prism surface 801 and the second prism surface 802 of the prism body 8.

[0056] like Figure 9 As shown, in this embodiment, the collimator unit 5 includes a collimator tube 501 and a single-fiber pigtail 502, a single-mode fiber 503 and a spherical lens 504 installed in the collimator tube 501. The single-fiber pigtail 502, the single-mode fiber 503 and the spherical lens 504 are connected in one step.

[0057] like Figure 10 As shown in this embodiment, a method for operating a free-space single-fiber multi-core multi-channel passive wavelength division multiplexing (WDM) component includes the following steps:

[0058] S1: Optical signals 1271, 1291, 1311, and 1331 emitted from the common port (COM:a) are separated into transmitted signals 1291 / 1311 / 1331 and reflected signal 1271 after passing through the first collimator assembly. The reflected signal 1271 is coupled to the single-fiber multi-core mode field b through the first collimator assembly, and then transmitted to the optical signal in the optical fiber b through the splitter monitoring.

[0059] S2: The transmitted signal 1291 / 1311 / 1331 passes through the second filter, separating the reflected signal 1291 and the transmitted signal 1311 / 1331. The reflected signal 1291 is transmitted through the first filter and collimator unit, and then coupled into the single fiber multi-core c mode field diameter. It is then monitored and transmitted to the optical signal in the fiber c by the splitter.

[0060] S3: After passing through the third filter, the transmitted signal 1311 / 1331 is separated into the transmitted signal 1311 and the reflected signal 1331. The transmitted signal is then transmitted after being collimated by the second collimator assembly.

[0061] S4: The reflected signal 1331 changes its transmission direction to horizontal through the right-angle prism, and then is transmitted to the third collimator through the fourth filter for coupling transmission.

[0062] This invention provides a free-space single-fiber multi-core multi-channel passive wavelength division multiplexing (WDM) component with advantages such as small size, low loss, low cost, and high integration. This invention achieves coupling integration by using a single-fiber 4-core optical fiber, a conventional small-angle incident thin-film filter, and a 45-degree right-angle prism through Gaussian beam coupling. The optical structure is simplified, with low insertion loss and low cost. The coupling process can be achieved using a single-fiber 3-core splitter and an asymmetric glass tube. This application not only improves fiber optic transmission efficiency but also effectively saves costs; therefore, this application has significant economic and practical value.

[0063] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing assembly, characterized by: The outer tube body is internally provided with a first collimator assembly, a second collimator assembly and a third collimator assembly, The outer tube body comprises a glass tube, The outer tube body is provided with a first mounting hole and a second mounting hole, The first mounting hole and the second mounting hole are provided at the same end or different ends of the outer tube body.

2. The free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing assembly according to claim 1, wherein: The first mounting hole is provided with the first collimator assembly, The second mounting hole is provided with a multi-hole tube body, and the second collimator assembly and the third collimator assembly are mounted in the multi-hole tube body.

3. The free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing assembly according to claim 2, wherein: The multi-hole tube body is internally provided with a plurality of collimator mounting holes for mounting the second collimator assembly and the third collimator assembly.

4. The free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing assembly according to claim 1, wherein: The first collimator assembly comprises a collimator unit and a first tube body mounted at the end of the collimator unit, The first tube body is provided with a first filter and a second filter at the end thereof, The first filter and the second filter are perpendicular to the cross section of the first tube body.

5. The free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing assembly according to claim 4, wherein: The second collimator assembly comprises a collimator unit and a second tube body mounted at the end of the collimator unit, and the end of the second tube body is beveled, The second tube body is provided with a third filter at the end thereof, The third filter is arranged on the bevel of the first tube body.

6. The free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing assembly according to claim 1, wherein: The third collimator assembly comprises a collimator unit and a third tube body mounted at the end of the collimator unit, The third tube body is provided with a fourth filter at the end thereof, One side of the fourth filter is provided with a prism body.

7. A free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing component according to any one of claims 4-5, characterized in that: The collimator unit comprises a collimator tube body, a single-fiber tail fiber, a single-mode optical fiber and a spherical lens mounted in the collimator tube body, and the single-fiber tail fiber, the single-mode optical fiber and the spherical lens are connected in one time.

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