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

Abstract

The invention provides a free-space single-fiber multi-core multi-channel 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 multi-channel optical passive wavelength division multiplexing assembly has the advantages of being small in size, low in loss, low in cost, high in integration and the like, coupling integration is achieved through Gaussian beam coupling by using the single-fiber four-core optical fiber, the conventional small-angle incidence film optical filter and the 45-degree right-angle prism, the optical structure is simplified, and the optical efficiency is improved. The optical fiber coupling device is simple in structure, low in insertion loss and low in cost, 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 coupling device has great economic value and use value.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fiber communication design, and in particular to a free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing component and a working method thereof. Background Art

[0002] Optical passive devices are an important part of optical fiber communication equipment and are also indispensable components in other optical fiber application fields. They are widely used in long-distance communication, regional networks, fiber-to-the-home, video transmission, optical fiber sensing, etc. Conventional 4-channel optical passive devices are cascaded by four 3-port devices (such as Figure 1 As shown), working principle: the signal is emitted from the COM end, for example, the wavelength 1271 / 1291 / 1311 / 1331 passes through the 1271 wavelength division multiplexer to separate the wavelength 1271, and the reflected wavelength 1291 / 1311 / 1331 passes through the second 1291 device to separate the wavelength 1291, and then passes through the third 1311 device to separate the wavelength 1311, and finally passes through the 1331 device to separate the wavelength of the 1331 channel. The second is a conventional free space structure, which uses the principle of free space and thin film interference to achieve a 4-channel output passive device. (As shown Figure 2 Working principle: The signal is emitted from the COM end, for example, 1271 / 1291 / 1311 / 1331 wavelengths, and after being collimated by the collimator 7, it is transmitted to the filter 1, and the thin film interference separates the 1271 wavelength and couples it to the collimator 8, and the 1291 / 1311 / 1331 wavelengths are reflected to the filter 2, and after the wavelength 1291 is separated, it is coupled to the collimator 5, and similarly, the 1311 wavelength is separated by the thin film interference of the filter 3 and transmitted to the collimator 6, and the 1331 wavelength is transmitted to the collimator 9. There are often certain deficiencies in the optical passive devices of the prior art, such as the high cost caused by the use of large-angle filters, which limits the use to a certain extent, and therefore, further improvements are needed. Summary of the invention

[0003] In view of the above-mentioned deficiencies of the prior art, the present invention provides a spatial single-fiber multi-core multi-channel optical passive wavelength division multiplexing component and a working method which is small in size, low in loss, low in cost and highly integrated.

[0004] The technical solution adopted by the present invention to solve the above problems is:

[0005] The present invention provides a free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing component, comprising an outer tube body, wherein a first collimator component, a second collimator component and a third collimator component are built in the outer tube body.

[0006] Further, the outer tube body comprises 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 arranged at the same end or different ends of the outer tube body.

[0009] Furthermore, the first collimator assembly is installed in the first installation hole.

[0010] A multi-porous tube body is disposed in the second installation hole, and the second collimator assembly and the third collimator assembly are installed in the multi-porous tube body.

[0011] Furthermore, a plurality of collimator installation positions are provided in the porous tube body for installing the second collimator assembly and the third collimator assembly.

[0012] Furthermore, the first collimator assembly includes a collimator unit and a first tube body installed at an end of the collimator unit.

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

[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 body installed at an end of the collimator unit, and the end of the second tube body is an inclined surface.

[0016] A third filter is provided at the end of the second tube.

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

[0018] Further, the third collimator assembly includes a collimator unit and a third tube body installed at the end of the collimator unit.

[0019] The end of the third tube body is provided with a fourth filter.

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

[0021] Furthermore, the collimator monomer comprises a collimator tube body and a single-fiber pigtail, a single-mode optical fiber and a spherical lens installed in the collimator tube body, and the single-fiber pigtail, the single-mode optical fiber and the spherical lens are connected at one time.

[0022] A free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing component working method comprises the following steps:

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

[0024] S2: The transmission signal passes through the second filter to separate the reflection signal and the transmission signal. The reflection signal is transmitted through the first filter and the collimator monomer, coupled to the single-fiber multi-core c mode field diameter, and then transmitted to the optical signal in the optical fiber c through the splitter monitoring;

[0025] S3: The transmission signal is separated into the transmission signal and the reflection signal after passing through the third filter. The transmission signal is collimated by the second collimator component and then transmitted.

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

[0027] The beneficial effects of the present invention are:

[0028] A free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing component provided by the present invention has the advantages of small size, low loss, low cost, high integration, etc. The present invention realizes 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 streamlined, the insertion loss is low, and the cost is low. The coupling process can be achieved with the help of a single-fiber 3-core splitter and an asymmetric glass tube. The present application not only improves the optical fiber transmission efficiency but also saves costs more effectively. Therefore, the present application has great economic value and use value. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a principle structure diagram of a passive wavelength division multiplexer in the prior art;

[0030] Figure 2 It is another principle structure diagram of a passive wavelength division multiplexer in the prior art;

[0031] Figure 3 It is a structural diagram of a free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing component of the present invention;

[0032] Figure 4 It is a cross-sectional view of a free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing component of the present invention;

[0033] Figure 5 It is a partial cross-sectional view of a free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing component of the present invention;

[0034] Figure 6 This is a multi-hole tube structure diagram of a free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing component of the present invention;

[0035] Figure 7 It 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 of the present invention;

[0036] Figure 8 It is a structural diagram of a collimator monomer of a free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing component of the present invention;

[0037] Fig. 9 It is a prism structure diagram of a free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing component of the present invention;

[0038] Fig.10 The present invention is a working flow chart of a free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing component. DETAILED DESCRIPTION

[0039] The following specifically describes the embodiments of the present invention in conjunction with the accompanying drawings, which are only for reference and illustration and do not constitute a limitation on the scope of patent protection of the present invention.

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

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

[0042] The outer tube body 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 disposed at the same end or different ends of the outer tube body 1 . In this embodiment, the first mounting hole 101 and the second mounting hole 102 are respectively disposed at two ends of the outer tube body 1 .

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

[0045] A multi-porous tube body 103 is disposed in the second installation hole 102 , and the second collimator assembly 3 and the third collimator assembly 4 are installed in the multi-porous tube body 103 .

[0046] In this embodiment, a plurality of collimator installation positions 104 are provided in the porous tube body 103 for installing the second collimator assembly 3 and the third 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 201 has a first filter 202 and a second filter 203 at the end thereof.

[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 sleeved on the outer side 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. The end of the second tube 301 is an inclined surface.

[0051] A third filter 302 is disposed at the end of the second tube 301.

[0052] The third filter 302 is arranged on the inclined surface of the first tube 201. In this embodiment, a second protective sleeve 200 is also sleeved on the outer side 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 end of the third tube body 6 is provided with a fourth filter 7.

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

[0056] like Fig. 9 As shown, in this embodiment, the collimator monomer 5 includes a collimator tube body 501 and a single-fiber pigtail 502, a single-mode optical fiber 503 and a spherical lens 504 installed in the collimator tube body 501, and the single-fiber pigtail 502, the single-mode optical fiber 503 and the spherical lens 504 are connected at one time.

[0057] like Fig.10 As shown, in this embodiment, a free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing component working method includes the following steps:

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

[0059] S2: The transmission signal 1291 / 1311 / 1331 passes through the second filter to separate the reflection signal 1291 and the transmission signal 1311 / 1331. The reflection signal 1291 is transmitted through the first filter and the collimator monomer, coupled to the single-fiber multi-core c mode field diameter, and then transmitted to the optical signal in the optical fiber c through the splitter monitoring;

[0060] S3: The transmission signal 1311 / 1331 is separated into the transmission signal 1311 and the reflection signal 1331 after passing through the third filter. The transmission signal is collimated by the second collimator component and then transmitted.

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

[0062] A free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing component provided by the present invention has the advantages of small size, low loss, low cost, high integration, etc. The present invention realizes 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 streamlined, the insertion loss is low, and the cost is low. The coupling process can be achieved with the help of a single-fiber 3-core splitter and an asymmetric glass tube. The present application not only improves the optical fiber transmission efficiency but also saves costs more effectively. Therefore, the present application has great economic value and use value.

[0063] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing component, characterized in that: It comprises an outer tube body, wherein a first collimator assembly, a second collimator assembly and a third collimator assembly are built in the outer tube body.

2. A free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing component according to claim 1, characterized in that: 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 arranged at the same end or different ends of the outer tube body.

3. A free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing component according to claim 1 or 2, characterized in that: The first collimator assembly is installed in the first installation hole. A multi-porous tube body is disposed in the second installation hole, and the second collimator assembly and the third collimator assembly are installed in the multi-porous tube body.

4. A free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing component according to claim 3, characterized in that: The porous tube body is provided with a plurality of collimator installation positions for installing the second collimator assembly and the third collimator assembly.

5. A free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing component according to claim 1, characterized in that: The first collimator assembly includes a collimator unit and a first tube body installed at the end of the collimator unit. The first tube end is provided with a first filter and a second filter. The first filter and the second filter are perpendicular to the cross section of the first tube.

6. A free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing component according to claim 1, characterized in that: The second collimator assembly includes a collimator unit and a second tube installed at the end of the collimator unit, and the end of the second tube is a bevel. A third filter is provided at the end of the second tube. The third filter is arranged on the inclined surface of the first tube body.

7. A free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing component according to claim 1, characterized in that: The third collimator assembly includes a collimator unit and a third tube body installed at the end of the collimator unit. The end of the third tube body is provided with a fourth filter. A prism is provided on one side of the fourth filter.

8. A free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing component according to any one of claims 5-6, characterized in that: The collimator monomer comprises a collimator tube body and a single-fiber pigtail, a single-mode optical fiber and a spherical lens installed in the collimator tube body, and the single-fiber pigtail, the single-mode optical fiber and the spherical lens are connected at one time.

9. A free-space single-fiber multi-core multi-channel optical passive wavelength division multiplexing component operating method, characterized in that: The steps include: S1: The optical signal emitted from the common port is separated into a transmission signal and a reflection signal after passing through the first collimator component. The reflection signal is coupled into the mode field of the single-fiber multi-core optical fiber b, and then the optical signal transmitted to the optical fiber b can be monitored by the splitter; S2: The transmission signal passes through the second filter to separate the reflection signal and the transmission signal. The reflection signal is transmitted through the first filter and the collimator monomer, coupled to the single-fiber multi-core c mode field diameter, and then monitored by the splitter to transmit the optical signal to the optical fiber c; S3: The transmission signal is separated into the transmission signal and the reflection signal after passing through the third filter. The transmission signal is collimated by the second collimator component and then transmitted. S4: The reflected signal changes its transmission direction to horizontal through a right-angle prism, and then is transmitted to the third collimator through the fourth filter for coupled transmission.

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