Multi-pump phase-sensitive amplifier based on highly nonlinear optical fiber and its generation method

Abstract

The invention provides a multi-pumping phase sensitive amplifier based on a highly nonlinear fiber and a generating method thereof, used for solving the problems that a four-order stepped phase response is not easy to generate in the PSA in the prior art, and the phase regeneration of a QPSK signal can not be realized. The generating method of the multi-pumping phase sensitive amplifier based on the highly nonlinear fiber comprises the following steps: N light waves interact in a four wave mixing process, and N coupled difference equations are obtained; the specific number of wavelengths thatparticipate in the four wave mixing process is confirmed; all the wavelengths that participate in the four wave mixing process are substituted into the N coupled difference equations in the step one to calculate the complex amplitude and phase of an output wave, so as to obtain the phase sensitive amplifier; and configuration parameters of the phase sensitive amplifier is optimized with a multi-wave model, so as to obtain three multi-pumping PSA based on the HNLF, used for QPSK signal regeneration. The invention designs a high energy efficiency PSA through optimizing the initial power of the pumping light and the signal light, and the four-order stepped phase response is obtained with low nonlinear phase shift to carried out the phase regeneration on the QPSK signal.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to a multi-pump phase-sensitive amplifier based on highly nonlinear optical fibers and a generating method. Background technique [0002] In optical communication, phase sensitive amplifier (PSA) has been widely used in the fields of low noise amplification and phase noise cancellation. In high-speed optical communication systems, in order to adapt to the rapidly increasing network traffic, advanced modulation formats with high spectral efficiency have become a research hotspot. At present, the 100Gb / s transmission system utilizing the QPSK modulation format has been put into commercial communication networks. In order to expand the scale of high-speed QPSK optical network, it is of great significance to study the regenerator used to eliminate the accumulated noise in the transmission of network nodes. [0003] A phase sensitive amplifier (PSA) can amplify the in-pha...

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Problems solved by technology

[0005] Aiming at the technical problem that the fourth-order step phase response is not easy to be generated in the existing PSA, and the phase regeneration of the QPSK signal cannot be realized, the present invention proposes a multi-pump phase-sensitive amplifier based on a highly nonlinear optical fiber and a generation method, and proposes three methods based on Phase-sensitive amplifiers for highly nonlinear optical fibers, and by optimizing their configuration parameters to have a fourth-order step phase response in the case of a small nonlinear phase shift (nonlinear phase shift, NPS) as much as possible, to realize the regeneration of QPSK signals function of

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