Fiber Dispersion Monitoring Device

Abstract

An optical fiber dispersion monitoring device includes an optical delay interferometer, a signal processing module, and a control module. The optical delay interferometer is controlled by a delay control signal so that the position of one of a plurality of orthogonal points of an amplitude response waveform corresponds to a center wavelength of an optical feedback signal of an optical communication system, and according to The delayed control signal and the optical feedback signal generate first and second delayed interference signals having a phase difference of 180 degrees with each other, the signal processing module generates at least one error signal according to the first and second delayed interference signals, and the control module The delay control signal is generated to the optical delay interferometer, and a control signal is generated and outputted to the optical communication system according to the at least one error signal to adjust the dispersion of the optical communication system.

Description

technical field [0001] The invention relates to a monitoring device, in particular to an optical fiber dispersion monitoring device. Background technique [0002] In optical fiber communication systems, chromatic dispersion or optical dispersion is a phenomenon in which light waves are dispersed into spectral components of different wavelengths due to the dependence of the wave speed on its wavelength. When an optical signal or pulse is projected into, for example, a fiber optic channel, its envelope propagates along the fiber optic channel at group velocity. Since the pulse contains a series of spectral components, each of which travels at a different group velocity, resulting in group velocity dispersion (GVD), intramodal dispersion, or simply fiber dispersion. This dispersion phenomenon is also often referred to as pulse broadening. As the pulse travels down the fiber, the spectral components continue to spread out in space and time until the pulse becomes too broad for...

AI Technical Summary

Problems solved by technology

[0004] However, when the traditional optical fiber dispersion monitoring device is used to monitor high-speed optical signals, it can only monitor a relatively short optical transmission distance (that is, the monitoring range is relatively limited) and the monitoring accuracy is poor, which makes it inconvenient. use

Therefore, there is still room for improvement in traditional optical fiber dispersion monitoring devices

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