A three-fiber-spacing pigtail

Abstract

The present invention discloses a three-fiber-spacing pigtail. The three-fiber-spacing pigtail provided by the present invention includes: three optical fibers, a filler, and a capillary tube; the optical fibers are arranged inside the capillary tube, and the filler is filled between the optical fibers and the capillary tube as well as between the optical fibers to fix the positions of the optical fibers inside the capillary tube; wherein, among the three optical fibers, there is one signal input optical fiber, one target wavelength signal output optical fiber, and one non-target wavelength signal output optical fiber; the signal input optical fiber and the non-target wavelength signal output optical fiber are two optical fibers selected from the three optical fibers that satisfy both the first set condition and the second set condition. By arranging three optical fibers in one pigtail in the present invention, there are different spacings between every two optical fibers, and one pigtail provides three different spacings. Each spacing can obtain an incident angle α, so that each spacing realizes a wavelength offset amount, and thus three different filter wavelength offset amounts are obtained from one optical fiber pigtail.

Description

Technical Field

[0001] The invention relates to the field of optical fiber communication, in particular to a three-optical fiber spacing pigtail. Background Art

[0002] The International Telecommunication Union has stipulated that the wavelength of 100G DWDM must meet the regulations of the International Telecommunication Union (ITU). Since the center wavelength of the 100G thin film filter in the production process cannot fully meet the ITU wavelength requirements, the center wavelength of the 100G thin film filter differs from the wavelength required by the ITU by a wavelength offset of Δλ. The existing technology adjusts the wavelength offset by using a dual-fiber spacing pigtail. The incident angles of dual-fiber spacing pigtails with different spacings are different, resulting in different filter wavelength offsets. Conventional dual-fiber spacing pigtails are to insert two optical fibers into two capillaries respectively, and the two capillaries have a certain interval. The spacing of the dual-fiber pigtail is determined by the center spacing of the two optical fibers. Not only is the structure single, but a dual-fiber spacing pigtail can only provide one spacing to complete the adjustment of one filter wavelength offset. Summary of the invention

[0003] The object of the present invention is to provide a three-fiber spacing pigtail capable of obtaining three different filter wavelength offsets.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] A three-fiber spacing pigtail comprises: three optical fibers, a filler and a capillary; the optical fibers are arranged in the capillary, and the filler is filled between the optical fibers and the capillary and between the optical fibers to fix the positions of the optical fibers in the capillary;

[0006] The three optical fibers include a signal input optical fiber, a target wavelength signal output optical fiber, and a non-target wavelength signal output optical fiber; the signal input optical fiber and the non-target wavelength signal output optical fiber are two optical fibers selected from the three optical fibers that satisfy both a first setting condition and a second setting condition, the first setting condition being that the input end of the non-target wavelength signal output optical fiber is located on a first reflection optical path, the first reflection optical path being an optical path obtained after the light emitted by the signal input optical fiber is reflected by a filter; the second setting condition being that the light emitted by the signal input optical fiber can be incident on the filter at an incident angle α, the incident angle α being an incident angle for allowing the target wavelength signal in the signal input optical fiber to pass through the filter;

[0007] The target wavelength signal output optical fiber is the optical fiber among the three optical fibers other than the signal input optical fiber and the non-target wavelength signal output optical fiber; the input end of the target wavelength signal output optical fiber is located on the second reflection optical path, and the second reflection optical path is the optical path obtained by reflecting the target wavelength signal passing through the filter by the high reflection film.

[0008] Optionally, the filler is an epoxy resin-based glue.

[0009] Optionally, the optical fiber is a bare optical fiber.

[0010] Optionally, the capillary includes a glass tube.

[0011] Optionally, the capillary further includes a ceramic tube.

[0012] Optionally, the cross-sectional shape of the hollow part of the capillary includes a quadrilateral, and the side length of the quadrilateral is 2-3 times the diameter of the bare optical fiber.

[0013] Optionally, the cross-sectional shape of the hollow part of the capillary includes an L shape.

[0014] Optionally, the cross-sectional shape of the hollow part of the capillary includes a T shape.

[0015] Optionally, the optical signal transmitted by the optical fiber is called a reflected optical signal after being reflected back to the optical fiber, and the wavelength of the reflected optical signal has a wavelength shift, and the wavelength shift makes the wavelength of the reflected optical signal comply with ITU regulations.

[0016] According to the specific embodiments provided by the present invention, the following technical effects are disclosed: The three-fiber-spacing pigtail provided by the present invention includes: three optical fibers, a filler, and a capillary; the optical fibers are disposed within the capillary, and the filler is filled between the optical fibers and the capillary and between the optical fibers to fix the positions of the optical fibers within the capillary; wherein, among the three optical fibers, there is a signal input optical fiber, a target wavelength signal output optical fiber, and a non-target wavelength signal output optical fiber; the signal input optical fiber and the non-target wavelength signal output optical fiber are two optical fibers selected from the three optical fibers that satisfy both the first set condition and the second set condition. The first set condition is that the input end of the non-target wavelength signal output optical fiber is located on the first reflection optical path, and the first reflection optical path is the optical path obtained after the light emitted by the signal input optical fiber is reflected by the filter. The second set condition is that the light emitted by the signal input optical fiber can be incident on the filter at an incident angle α, and the incident angle α is the incident angle that enables the target wavelength signal in the signal input optical fiber to pass through the filter. The target wavelength signal output optical fiber is the optical fiber among the three optical fibers other than the signal input optical fiber and the non-target wavelength signal output optical fiber; the input end of the target wavelength signal output optical fiber is located on the second reflection optical path, and the second reflection optical path is the optical path obtained after the target wavelength signal passing through the filter is reflected by the high-reflection film. By providing three optical fibers in one pigtail and having different spacings between every two optical fibers, the present invention enables one pigtail to provide three different spacings, and each spacing can obtain an incident angle α, so that each spacing realizes a wavelength shift amount, and thus one optical fiber pigtail obtains three different filter wavelength shift amounts. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 Schematic diagram of the working principle of the three-fiber pigtail;

[0019] Figure 2 Front view of the three-fiber-spacing pigtail with a quadrilateral cross-sectional shape of the hollow part of the capillary;

[0020] Figure 3 Side view of the three-fiber-spacing pigtail with a quadrilateral cross-sectional shape of the hollow part of the capillary;

[0021] Figure 4 Front view of the three-fiber-spacing pigtail with an L-shaped cross-sectional shape of the hollow part of the capillary;

[0022] Figure 5Side view of a three-fiber-spacing pigtail with an L-shaped cross-sectional shape of the hollow part of the capillary

[0023] Figure 6 Front view of a three-fiber-spacing pigtail with a T-shaped cross-sectional shape of the hollow part of the capillary

[0024] Figure 7 Side view of a three-fiber-spacing pigtail with a T-shaped cross-sectional shape of the hollow part of the capillary

[0025] Symbol description:

[0026] Optical fiber - 1, capillary - 2, filler - 3, lens - 4, filter - 5, high-reflection film - 6, signal input optical fiber - 7, target wavelength signal output optical fiber - 8, non-target wavelength signal output optical fiber - 9 Specific implementation manner

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention

[0028] The purpose of the present invention is to provide a three-fiber-spacing pigtail that can obtain three different wavelength offsets

[0029] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners

[0030] The three-fiber-spacing pigtail of the present invention includes: three optical fibers, a filler 3, and a capillary 2; the optical fiber 1 is arranged in the capillary 2, and the filler 3 is filled between the optical fiber 1 and the capillary 2 and between the optical fibers 1 to fix the position of the optical fiber 1 in the capillary 2

[0031] Specifically, the filler 3 is an epoxy resin-based glue; the optical fiber 1 is a bare optical fiber; the capillary 2 includes both a glass tube and a ceramic tube

[0032] Among them, the three optical fibers include a signal input optical fiber 7, a target wavelength signal output optical fiber 8, and a non-target wavelength signal output optical fiber 9; the signal input optical fiber 7 and the non-target wavelength signal output optical fiber 9 are two optical fibers selected from the three optical fibers that satisfy both the first set condition and the second set condition. The first set condition is that the input end of the non-target wavelength signal output optical fiber 9 is located on the first reflection optical path, and the first reflection optical path is the optical path obtained by reflecting the light emitted from the signal input optical fiber 7 by the filter. The second set condition is that the light emitted from the signal input optical fiber 7 can be incident on the filter at an incident angle α, and the incident angle α is the incident angle that enables the target wavelength signal in the signal input optical fiber 7 to pass through the filter 5.

[0033] The target wavelength signal output optical fiber 8 is the optical fiber among the three optical fibers other than the signal input optical fiber 7 and the non-target wavelength signal output optical fiber; the input end of the target wavelength signal output optical fiber 8 is located on the second reflection optical path, and the second reflection optical path is the optical path obtained by reflecting the target wavelength signal passing through the filter 5 by the high reflection film 6.

[0034] Specifically, since the International Telecommunication Union has specified that the wavelengths of 100G DWDM need to meet the ITU regulations, when the optical signal that meets the ITU regulations is perpendicularly incident on the 100G thin film filter 5, due to the fact that the center wavelength of the 100G thin film filter 5 in the production process cannot fully meet the ITU wavelength requirements, the optical signal perpendicularly incident on the 100G thin film filter 5 cannot pass through the 100G thin film filter 5. Different 100G thin film filters 5 require the optical signal to be incident on the 100G optical thin film filter 5 at different incident angles, so that the optical signal that meets the ITU regulations can pass through the filter 5, which is equivalent to indirectly adjusting the center wavelength of the 100G thin film filter 5.

[0035] Further, as Figure 1 shown, there are multiple 100G ITU wavelength λ1……λ k optical signals in the signal input optical fiber 7, where the target wavelength is λ n , and the optical signals with wavelengths λ1……λ k emerge from the signal input optical fiber 7 and are converged into parallel light by the collimating lens 4. The target wavelength optical signal with wavelength λ n that meets the ITU wavelength requirements can pass through the corresponding filter 5. Then, the center wavelength λ0 of the corresponding filter 5 needs to shift towards the short wavelength direction by a wavelength shift amount Δλ. The wavelength shift amount is related to the incident angle of the optical signal incident on the filter 5. When the wavelength shift amount is Δλ, the optical signal with target wavelength λ n needs to be incident on the corresponding 100G optical thin film filter 5 at an incident angle α through the collimating lens 4, so that the target wavelength optical signal with wavelength λ n that meets the ITU wavelength requirements can pass through.The optical signal can pass through the filter 5, and the non-target wavelength light signals with wavelengths λ1...λ k (except for λ n ) are reflected by the 100G optical thin film filter 5 to the non-target wavelength signal output optical fiber 9. Due to the different incident angles generated by the spacing between the different signal input optical fiber 7 and the non-target wavelength signal output optical fiber 9, the spacing between the signal input optical fiber 7 and the non-target wavelength signal output optical fiber 9 determines the incident angle α, and thus the spacing between the signal input optical fiber 7 and the non-target wavelength signal output optical fiber 9 determines the wavelength offset.

[0036] The relationship between the ITU wavelength and the center wavelength of the corresponding filter 5 is as follows:

[0037] λ n = λ0 - Δλ;

[0038] λ n is the target wavelength, λ0 is the center wavelength of the optical thin film filter 5 corresponding to λ n , and Δλ is the wavelength offset.

[0039] Furthermore, the optical signal in the signal input optical fiber 7 includes the optical signal of the target wavelength and the optical signal of the non-target wavelength. The optical signal of the target wavelength needs to be incident on the filter 5 at the incident angle α to pass through the filter 5. Then, according to the incident angle α, the spacing between the signal input optical fiber 7 and the non-target wavelength signal output optical fiber 9 is determined, so as to determine which two of the three optical fibers in the three-fiber-spacing pigtail of the present invention are the signal input optical fiber 7 and the non-target wavelength signal output optical fiber 9, and the other one is the target wavelength signal output optical fiber 8.

[0040] The optical signal in the signal input optical fiber 7 passes through the collimating lens 4 and is incident on the filter 5 at the incident angle β. Among them, the optical signal of the target wavelength passes through the filter 5 and reaches the high reflection film 6. After being reflected by the high reflection film 6, it passes through the filter 5 and the lens 4 and is incident on the target wavelength signal output optical fiber 8, while the optical signal of the non-target wavelength does not pass through the filter 5 and is reflected by the filter 5 and passes through the lens 4 and is incident on the non-target wavelength signal output optical fiber 9.

[0041] The three-fiber-spacing pigtail of the present invention has three kinds of spacings, which can realize three different incident angles, and thus can realize three different wavelength offsets of the filter 5.

[0042] The cross-sectional shape of the hollow part of the capillary 2 includes a quadrilateral, and the side length of the quadrilateral is 2 - 3 times the diameter of the bare optical fiber.

[0043] Specifically, as Figure 2 and Figure 3 shown, the cross-sectional shape of the hollow part of the capillary 2 of the three-fiber-spacing pigtail is a quadrilateral. Further, the cross-sectional shape of the hollow part of the capillary 2 is a square.

[0044] In a three-fiber-spacing pigtail with a capillary 2 having a quadrilateral cross-sectional shape of the hollow part, two optical fibers are fixed near one side of the quadrilateral, and the other optical fiber can be freely fixed at the remaining positions of the quadrilateral; according to the positions of the three optical fibers, there is a spacing between any two optical fibers, and three spacings are generated by the three optical fibers, realizing that a capillary 2 with a quadrilateral structure can provide three spacings to obtain three different wavelength offsets to adjust the central wavelength of the 100G thin film filter 5.

[0045] Furthermore, as Figure 4 and Figure 5 shown, in order to reduce the amount of glue filled between the optical fiber and the capillary 2, the cross-sectional shape of the hollow part of the capillary 2 includes an L-shaped structure (or a seven-shaped structure); that is, the cross-sectional shape of the hollow part of the capillary 2 is L-shaped; the side length of the longer side of the vertical side of the L-shaped structure of the L-shaped structure and the side length of the longer side of the horizontal side of the L-shaped structure are both 2 to 3 times the diameter of the bare optical fiber.

[0046] In a three-fiber-spacing pigtail with a capillary 2 having an L-shaped cross-sectional shape of the hollow part, two optical fibers are respectively fixed on one side of the vertical side and one side of the horizontal side of the L-shaped structure of the L-shaped structure, and the other optical fiber can be freely fixed between the two fixed optical fibers; according to the different positions of the three optical fibers, there is a spacing between any two optical fibers, and three spacings are generated by the three optical fibers, realizing that a capillary 2 with an L-shaped structure can provide three spacings to obtain three different wavelength offsets to adjust the central wavelength of the 100G thin film filter 5.

[0047] Even further, as Figure 6 and Figure 7 shown, the cross-sectional shape of the hollow part of the capillary 2 includes a T-shaped structure. That is, the cross-sectional shape of the hollow part of the capillary 2 is T-shaped; the side length of the upper horizontal part of the T-shaped structure of the T-shaped structure is 2 to 3 times the diameter of the bare optical fiber.

[0048] In a three-fiber-spacing pigtail with a capillary 2 having a T-shaped cross-sectional shape of the hollow part, two optical fibers are respectively located at the left and right ends of the upper horizontal part of the T-shaped structure of the T-shaped structure, and the other optical fiber can be freely fixed at the position of the lower vertical part of the T-shaped structure; according to the different positions of the three optical fibers, there is a spacing between any two optical fibers, and three spacings are generated by the three optical fibers, realizing that a capillary 2 with a T-shaped structure can provide three spacings to obtain three different wavelength offsets to adjust the central wavelength of the 100G thin film filter 5.

[0049] As an embodiment of the present invention, the present invention provides three optical fibers in a single pigtail, and different spacings are provided between every two optical fibers, so that a single pigtail can provide three different spacings, and each spacing can obtain an incident angle α, thereby achieving a wavelength shift amount for each spacing, and thus three different filter wavelength shift amounts are obtained from a single optical fiber pigtail.

[0050] The various embodiments in this specification are described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other.

[0051] Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A three-fiber-spacing pigtail, characterized in that, The three-fiber-spacing pigtail includes: three optical fibers, a filler, and a capillary tube; the optical fibers are arranged inside the capillary tube, and the filler is filled between the optical fibers and the capillary tube and between the optical fibers to fix the positions of the optical fibers inside the capillary tube; Among them, the three optical fibers include one signal input optical fiber, one target wavelength signal output optical fiber, and one non-target wavelength signal output optical fiber; the signal input optical fiber and the non-target wavelength signal output optical fiber are two optical fibers selected from the three optical fibers that satisfy both the first set condition and the second set condition. The first set condition is that the input end of the non-target wavelength signal output optical fiber is located on the first reflection optical path, and the first reflection optical path is the optical path obtained after the light emitted by the signal input optical fiber is reflected by the filter; the second set condition is that the light emitted by the signal input optical fiber can be incident on the filter at an incident angle α, and the incident angle α is the incident angle that allows the target wavelength signal in the signal input optical fiber to pass through the filter; The target wavelength signal output optical fiber is the optical fiber among the three optical fibers other than the signal input optical fiber and the non-target wavelength signal output optical fiber; the input end of the target wavelength signal output optical fiber is located on the second reflection optical path, and the second reflection optical path is the optical path obtained after the target wavelength signal passing through the filter is reflected by the high-reflection film; The cross-sectional shape of the hollow part of the capillary tube includes a quadrilateral, and the side length of the quadrilateral is 2-3 times the diameter of the bare optical fiber; two optical fibers are fixed near one side of the quadrilateral, and the other optical fiber can be freely fixed at other positions of the quadrilateral; or the cross-sectional shape of the hollow part of the capillary tube includes an L shape or a T shape; The spacing between every two of the three optical fibers is different, and different spacings form different incident angles; each spacing realizes a wavelength offset.

2. The three-fiber-spacing pigtail according to claim 1, characterized in that, The filler is an epoxy resin-based glue.

3. The three-fiber-spacing pigtail according to claim 1, characterized in that, The optical fiber is a bare optical fiber.

4. The three-fiber-spacing pigtail according to claim 1, characterized in that, The capillary tube includes a glass tube.

5. The three-fiber-spacing pigtail according to claim 1, characterized in that, The capillary tube includes a ceramic tube.

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