an optical module

Abstract

The embodiment of the invention provides an optical module, and relates to the field of optical communications. The optical module provided by the embodiment of the invention changes a polarization direction of received information light by use of an optical rotator; the information light from the optical rotor is divided into the first beam of light and the second beam of light by use of a polarization beam splitter; the first beam of light and the second beam of light have different polarization directions; the intensity information of the first beam of light is detected by use of a first optical detector, and the intensity information of the second beam of light is detected by use of a second detector; the intensity information of the first beam of light and the intensity information of the second beam of light are received by use of a processor so as to drive the optical rotor to change the polarization direction of the received information light. By use of the optical module provided by the embodiment of the invention, the loss of the light power is lowered, and the error information is avoided from being resolved.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to an optical module. Background technique [0002] In order to increase the transmission rate of the single-wavelength light of the optical module, a polarization mode multiplexing technology is used in the prior art to combine multiple beams of light of the same wavelength with different polarization directions into one beam of light. Before merging, each beam of light carries information at a certain transmission rate, and the information transmission rate of a beam of light obtained after merging is the sum of the information transmission rates of multiple beams of light before merging. The purpose of improving the information transmission rate. [0003] Specifically, a polarization mode multiplexing optical module provided in the prior art is as figure 1 shown. The optical module adopts polarization mode multiplexing technology, and its transmitting end includes a laser,...

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Problems solved by technology

[0005] However, in actual use, the detector of the above-mentioned optical module not only receives weak optical power, but also analyzes the wrong information

[0006] In view of the above problems, the inventors of the present application found that: due to the high cost of polarization-maintaining optical fibers, non-polarization-maintaining optical fibers are generally used for optical transmission at present

Using non-polarization-maintaining fiber to transmit polarized light, the polarization direction of polarized light will rotate during the transmission process, and the optical module at the receiving end cannot predict the polarization direction of the light that finally reaches the detection end of the optical module, making multi-directional polarized light and polarization The beam splitter does not match, resulting in the process of using a polarization beam splitter to separate unidirectionally polarized light from multi-directionally polarized light. Not only will there be a large loss of optical power, but also light components will be generated in other polarization directions. The light component in the polarization direction is a kind of crosstalk signal, which will affect the resolution of the light information by the detector, so that the resolved information is wrong

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