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Single mode attenuation spectrum testing method of single-mode fiber

A single-mode optical fiber and testing method technology, which is applied in the field of single-mode attenuation spectrum testing, can solve the problems that the attenuation spectrum cannot be accurately tested and cannot be measured accurately.

Active Publication Date: 2017-04-05
YANGTZE OPTICAL FIBRE & CABLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The truncation method in the fiber attenuation test specified in the standard only filters out the cladding mode of the fiber, and is only applicable to the attenuation spectrum test under the condition that the test wavelength is greater than the cut-off wavelength of the fiber
For the attenuation spectrum test in the wavelength range lower than the single-mode fiber cut-off wavelength, due to the existence of high-order modes, the test attenuation spectrum result is not the real attenuation spectrum of the fiber in the single-mode state, that is, there is an inaccurate state
For fibers with higher cutoff wavelengths, such as G.654 large effective area fibers, the fiber cutoff wavelength is usually around 1530nm, so using the conventional attenuation spectrum test method, its attenuation spectrum below 1530nm is interfered by high-order modes and cannot be accurately tested

Method used

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  • Single mode attenuation spectrum testing method of single-mode fiber
  • Single mode attenuation spectrum testing method of single-mode fiber
  • Single mode attenuation spectrum testing method of single-mode fiber

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0033] Embodiment 1: Take the optical fiber F 1 It is G.652 optical fiber, and its cut-off wavelength is less than 1240nm. L 1 2m, in fiber F 1 Make a circle of Φ28cm*n+Φ6cm*1 on the top, where n means that the remaining length of the 2m optical fiber is wound into multiple D28cm circles and placed;

[0034] In the embodiment of the present invention, D1 The circle with a diameter of 28cm is taken to place the fiber without affecting the fiber signal mode. G.652 fiber is used in the embodiment because G.652 fiber is the most common fiber with a relatively low cut-off wavelength of fiber and is easy to obtain.

[0035] Take the optical fiber F in Example 1 2 , F 3 It is the same type of large effective area high cut-off wavelength fiber (G.654 fiber), and its cable cut-off wavelength is greater than 1600nm. Fiber F 2 length L 2 2.1km; fiber F 3 It is an optical fiber with a large effective area and a high cut-off wavelength to be tested, with a length of 25km. Fiber F...

Embodiment 2

[0040] Example 2: Take Fiber F 1 It is G.652 fiber, and its cable cut-off wavelength is less than 1240nm. L 1 2m at fiber F 1 Make a circle of Φ28cm*n+Φ6cm*1, where n refers to the 2m optical fiber after the circle is wound into multiple circles of Φ28cm;

[0041] Take the optical fiber F in the embodiment 2 2 is 0m, fiber F 3 The fiber to be tested is a large effective area high cut-off wavelength fiber (G.654 fiber) with a length of 25km and a cable cut-off wavelength greater than 1500nm. Fiber F 3 Cut back length L C is 16m.

[0042] The cut-off wavelength of the test cut-back fiber is 1427 nm.

[0043] Fiber F 3 The original attenuation spectrum and the filtered attenuation spectrum of Example 2 are as image 3 As shown, it can be clearly seen that the original attenuation spectrum is lower than 1450nm wavelength, the fiber attenuation is higher, because the attenuation before 1450nm wavelength covers higher-order modes. After mode filtering, the attenuation bet...

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Abstract

The invention discloses a single mode attenuation spectrum testing method of a single-mode fiber; the method comprises the following steps: providing a single-mode fiber F1 with the length L1 and a small cut-off wavelength; looping the fiber F1 according to the formula: [phi] D1cm*X+[phi] D2cm*Y, wherein D1 and D2 respectively refer to looping diameters, and X and Y respectively refer to looping numbers; fusing a measured single-mode fiber F3 with the single-mode fiber F1; cutting off the single-mode fiber F3, and using an intercept method to test the attenuation spectrum of the single-mode fiber F3 with large effective area and high cut-off wavelength. The method can use a normal fiber attenuation detection device and easily obtained testing resources to filter the higher-order mode of the single-mode fiber with high cut-off wavelength, thus obtaining the single mode attenuation spectrum within certain wavelength scope lower than the cut-off wavelength; the single mode attenuation spectrum can be used for testing and calculating performances of various fibers.

Description

technical field [0001] The invention belongs to the technical field of optical fiber and cable testing, and more specifically relates to a testing method for a single-mode attenuation spectrum of a single-mode optical fiber. Background technique [0002] The cut-off wavelength of a single-mode fiber is an inherent optical property, which is determined by the refractive index profile structure of the fiber. The attenuation spectrum of an optical fiber is an important parameter and reference basis for analyzing its optical fiber performance and conducting optical fiber design research, and it is necessary to rely on accurate single-mode state attenuation spectrum for calculation in various performance tests of optical fibers, which is very important for the research and improvement of optical fiber performance. Significance. The truncation method in the fiber attenuation test specified in the standard only filters out the cladding mode of the fiber, and is only applicable to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/00
CPCG01M11/33
Inventor 孙梦珣汪伟光李婧熊壮曹蓓蓓
Owner YANGTZE OPTICAL FIBRE & CABLE CO LTD