Optical fiber dispersion measuring method and measuring device

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...

AI Technical Summary

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 dispersion is not accurate enough

The time delay method is the most convenient method for measuring fiber dispersion, but it is easily affected by other factors and the measurement accuracy is not high

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