All-optical phase noise inhibition method for coherent detection

Abstract

The invention relates to an all-optical phase noise inhibition method for coherent detection. Aiming at the current situation that the local oscillation coherent reception phase noise characteristic is improved through an ultra-low noise performance light source and complex circuit processing technology at present, the all-optical method is provided to inhibit the phase noise and improve the receiving performance. The method comprises the steps that: through a transmitting terminal, one path of a pair of light carrier waves with relevant properties is loaded with information to form signal light, while the other path is used as coherent light and is subjected to wave combination with the signal light to enter optical fibers for transmission; and a receiving terminal performs frequency mixing on the extracted signal light and coherent light, and photovoltaic conversion and signal demodulation are performed in turn. In the method, the phase noise in the coherent detection is inhibited by utilizing the characteristic that homologous generated light carrier waves have relativity without using a local light source and a complex signal processing process, so the structure is simplified and the cost is reduced. In addition, multiple groups of light carrier waves can be acquired by using the technology of combining a wide-spectrum and multi-wavelength light source with spectral partitioning, so the inhibition of the phase noise in a multi-channel coherent light communication system is easy to realize.

Description

technical field [0001] The invention belongs to the field of coherent optical communication, and in particular relates to using an all-optical method to suppress phase noise in a coherent detection process so as to improve coherent receiving performance. Background technique [0002] Coherent detection is one of the key technologies for realizing large-capacity and high-spectrum utilization optical communication. The relative intensity modulation and direct detection methods have the advantages of high receiving sensitivity and are applicable to various modulation formats. The common coherent optical communication uses a local light source at the receiving end to generate coherent light and the received signal light, after mixing, the photodetector performs photoelectric conversion to obtain an electrical signal for demodulation. In practical applications, the bit error rate performance of the receiver is severely limited by the phase noise of the laser, and whether it can b...

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Problems solved by technology

[0003] The present invention proposes an all-optical phase noise suppression method suitable for coherent detection, aiming at the current situation in which ultra-low phase noise lasers are used as signal light sources and local light sources or complex digital circuit processin

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