Optical depolarizer

Abstract

The invention provides an optical depolarizer which comprises a polarization beam splitter, a first polarization-maintaining coupler, a second polarization-maintaining coupler, a first circulating polarization-maintaining optical fiber, a second polarization-maintaining optical fiber, a first output polarization-maintaining optical fiber, a second output polarization-maintaining optical fiber and a polarization beam combiner, wherein the first circulating polarization-maintaining optical fiber receives light emitted from the first polarization-maintaining coupler and light emitted to the second polarization-maintaining coupler; the second circulating polarization-maintaining optical fiber receives light emitted from the second polarization-maintaining coupler and light emitted to the first polarization-maintaining coupler; the length of the second circulating polarization-maintaining optical fiber is equal to the length of the first circulating polarization-maintaining optical fiber and more than the distance generated by the coherence time of light transmission; the first output polarization-maintaining optical fiber receives the light emitted from the first polarization-maintaining coupler; the second output polarization-maintaining optical fiber receives the light emitted from the second polarization-maintaining coupler; the length difference between the first output polarization-maintaining optical fiber and the second output polarization-maintaining optical fiber is more than the length of the first circulating polarization-maintaining optical fiber. The depolarizer with an all-optical fiber structure, which is provided by the invention, is simple in structure and convenient to use.

Description

technical field [0001] The invention relates to an optical device, in particular to an optical depolarizer for changing polarized light into non-polarized light. Background technique [0002] With the development of network communication, the data transmission speed of the optical fiber network is getting faster and faster, and the requirement for the capacity of the optical fiber network is also getting higher and higher. Most of the existing optical fiber networks transmit linearly polarized light, and the resulting polarization-dependent loss, polarization-dependent gain and other interferences sensitive to polarized light affect the quality of optical fiber network transmission signals. Therefore, some existing optical fiber networks use optical depolarizers to depolarize polarized light, so as to change polarized light into unpolarized light. [0003] The commonly used optical depolarizer is the Lyot depolarizer, which forms a time delay through the time difference bet...

AI Technical Summary

Problems solved by technology

[0007] However, the above-mentioned depolarizer needs to use a polarization analyzer to detect the depolarization characteristics of the output light, and adjust the relative angle of the mold plate through the depolarization characteristics. The relative angle needs to be adjusted for different lights, and the operation process is relatively complicated. The user needs to precisely adjust the mold plate to get better depolarization light when using it, which makes the depolarizer not suitable for some complex and harsh environments, which brings inconvenience to the user when performing maintenance and installation outdoors and affects their work efficiency.

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