Dispersion compensator

Abstract

The invention provides a dispersion compensator, which comprises a light guide component, two groups of polarization change component arrays and two groups of etalon component arrays. The dispersion compensator further comprises a reflecting mirror and an optical circulator. A polarized beam L is incident from a first port of the optical circulator, transmitted to the light guide component by a third port and incident into a first etalon component by a first polarization change component; light reflected from the first etalon component is changed into a polarized beam L1 vertical to the incident beam L after passing through the first polarization change component; the beam L1 is incident to the light guide component again and guided to a second polarization change component and a second etalon component after being shifted for a certain distance; and the light is regularly reciprocally reflected and propagated according to the light path until being reflected back to the light guide component by the reflecting mirror after passing through the light guide component, transmitted reversely by the light path and output by a second port. The dispersion compensator has a compacter and more miniature structure at the same time of meeting bandwidths in a larger range.

Description

technical field [0001] The invention belongs to the field of optical communication, and in particular relates to a dispersion compensator. Background technique [0002] The light propagating in the optical network usually suffers from chromatic dispersion (chromatic dispersion) or polarization mode dispersion (PMD). These dispersions will cause distortion of the optical signal waveform. coarse), correct data exchange cannot be performed. Since the PMD varies randomly due to the influence of the fiber laying condition and the external environment, the communication quality is degraded. In particular, the higher the speed, the easier it is to be affected by PMD, which is also the main reason for the degradation of the communication quality of the 100Gbps system. [0003] The basic optical element used in the dispersion compensation module is the GT (Gires-Tournois) etalon, which is essentially an all-pass filter, that is, all wavelength signals are fully reflected, and its r...

AI Technical Summary

Problems solved by technology

The disadvantage of this solution is that in order to achieve more broadband requirements, it is necessary to increase the number or length of multiple 1 / 4 wave plates, PBS prisms, and etalons, which increases the volume of the device to a certain extent.

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