Optical fiber dispersion measuring method and measuring device

A technology of optical fiber dispersion and measurement method, which is applied in the direction of measuring devices, optical instrument testing, and testing optical performance, etc., and can solve the problems of inaccurate dispersion accuracy and low measurement accuracy.

Pending Publication Date: 2021-05-18
SUZHOU 614 INFORMATION TECH CO LTD +2
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Problems solved by technology

Interferometry has many advantages in measuring dispersion, such as low measurement cost and high resolution of measured dispersion, but it also has disadvantages: the accuracy of measured dispe

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  • Optical fiber dispersion measuring method and measuring device
  • Optical fiber dispersion measuring method and measuring device
  • Optical fiber dispersion measuring method and measuring device

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Embodiment Construction

[0036] Aiming at the deficiencies of the existing technology, the solution of the present invention is based on the basic principle of the phase-shift method, using the optical single sideband detection signal to overcome the dispersion-induced power attenuation phenomenon in the traditional optical link, so as to realize the optical fiber dispersion Low cost and high performance for measurement; in addition, because the present invention uses an optical tunable filter, it can not only suppress the power attenuation effect caused by dispersion, but also effectively filter out other noises.

[0037] Specifically, the method for measuring optical fiber dispersion of the present invention is as follows:

[0038] The optical signal filtered out from the broadband optical signal by an optical band-pass filter is used as an optical carrier, the optical carrier is intensity-modulated with a reference microwave signal, and the first-order sideband on one side of the generated intensity...

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Abstract

The invention discloses an optical fiber dispersion measurement method. The method comprises the following steps of: taking optical signals filtered from broadband optical signals by an optical band-pass filter as optical carriers, performing intensity modulation on the optical carriers by using reference microwave signals, and filtering out first-order sidebands on one sides of the generated intensity-modulated optical signals to obtain probe light; converting the probe light into electric signals after enabling the probe light to pass through a to-be-measured optical fiber, measuring the phase difference between the electric signals and the reference microwave signals, calculating the group delay of the to-be-measured optical fibers corresponding to the current optical carrier wavelength according to the phase difference, and further calculating the dispersion coefficient of the to-be-measured optical fiber corresponding to the current optical carrier wavelength. The invention further discloses an optical fiber dispersion measuring device. Compared with the prior art, the method and device of the invention have the advantages of low noise, high power and small external interference.

Description

technical field [0001] The invention relates to the technical field of optical device measurement, in particular to a method for measuring optical fiber dispersion. Background technique [0002] With the advantages of large transmission capacity and good confidentiality, optical fiber communication has become one of the most important wired communication methods in the world. Its main principle is to use optical fiber, that is, optical fiber, for signal transmission to realize a communication method for information transmission. For the whole process of optical fiber communication, the dispersion of optical fiber is an inherent property of optical fiber communication system, which is inevitable in itself. With the gradual increase of system capacity, especially in order to adapt to the development trend of the next generation of high-speed optical fiber communication system , the dispersion will be non-negligible. Measuring the value of fiber dispersion is more important to...

Claims

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Application Information

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IPC IPC(8): G01M11/00G01M11/02G01M11/08
CPCG01M11/336G01M11/02G01M11/088
Inventor 刘世锋杨丽潘时龙傅剑斌
Owner SUZHOU 614 INFORMATION TECH CO LTD
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