Coherent optical receiving device and optical signal demodulation device

Abstract

The embodiment of the invention provides a coherent optical receiving device and an optical signal demodulation device, which are used for eliminating the special requirement of the coherent optical receiving device on the fixed polarization state of input local oscillation light and improving the general adaptability of a coherent optical transmission technology. According to the method, a polarization light splitting unit, an optical frequency mixing unit and a synthesis unit are included, the polarization light splitting unit is connected with the input end of the optical frequency mixing unit, and the synthesis unit is connected with the output end of the optical frequency mixing unit; the polarization light splitting unit is used for receiving local oscillation light in any polarization state and carrying out polarization state decomposition on the received local oscillation light to obtain first polarized light with orthogonal polarization states; the optical frequency mixing unit is used for mixing the first polarized light and second polarized light and outputting the mixed light to the light synthesis unit, and the second polarized light is polarized light which is obtained by decomposing signal light and has an orthogonal polarization state; and the synthesis unit is used for synthesizing every two paths of light output by the optical frequency mixing unit into one path of light to be output.

Description

technical field [0001] The present application relates to the technical field of coherent optical communication, in particular to a coherent optical receiving device and an optical signal demodulation device. Background technique [0002] Coherent optical transmission technology has the advantages of large transmission capacity and long distance, and is widely used. At the receiving end of the coherent optical communication system, the local oscillator light and the signal light are simultaneously input into the mixing device for mixing, and the output light after mixing is converted into an electrical signal, which can be obtained by sampling, analog-to-digital conversion and digital signal processing. The amplitude and phase information of the signal light, so as to realize the decoding function. [0003] At present, the frequency mixing devices used in the industry (such as conventional coherent optical mixing units and mixers) need to input local oscillator light with a...

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Problems solved by technology

[0003] At present, the frequency mixing devices used in the industry (such as conventional coherent optical mixing units and frequency mixers) need to input local oscillator light with a fixed polarization state, because such networks cannot satisfy such requirements in data center networks (DCN) and other networks. The special requirements

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