QPSK Signal Regeneration Based on Vector Phase Sensitive Amplification With Low Pump Powers

Abstract

In this paper, an all-optical quadrature phase shift keying (QPSK) phase regeneration scheme using vector phase sensitive amplification (PSA) is proposed, analyzed, and simulated. Compared with the conventional scalar PSA scheme, the vector superposition of harmonics makes it easy to obtain high gain extinction ratio (GER) with low pump powers. A subsequent phase-preserving amplitude regenerating device is also introduced to achieve full-quadrature regeneration of signal without phase conjugation and frequency conversion. In addition to the theoretical analysis of the implementation principle, a series of simulation results' analysis, including comparison with traditional scheme and regeneration performance assessment, is also included. The results show that undesired harmonics are greatly reduced by nearly 40 dB, and high GERs are available independent of input power. What is more, various levels of phase and amplitude noise can be effectively compressed for 10-Gbd QPSK signal. The regeneration system also reduces the signal bit error rate and gets 2-dB receiver optical signal noise ratio (OSNR) improvements at 13-dB OSNR input, which has potential applications in enhancing transmission distance in the future optical communication network.INDEX TERMS All-optical signal regeneration, optical fiber communication, optical signal processing, optical polarization, phase sensitive amplification, quadrature phase shift keying.

Analytical Models for the Computation of Error Probability of Multi-Level Phase Shift Keying Modulation Scheme

“…On the contrary, in the Multi-level Phase Shift Keying (MPSK ) modulation scheme, instead of two-phase variations, multiple phase variations are used to represent the digital data. Specifically, in BPSK only one bit (n =1) is represented, however in MPSK there is M number of different signal phases that are used to represent n bits of digital data, where n =( ) [12,13,14,15,16,17].…”

All-optical simultaneous amplitude and phase regeneration for MPSK signal with ASE noise based on two-wave PSA

“…PSA-based regeneration technology has been widely employed for BPSK [12], QPSK [13][14][15][16][17][18][19][20], 8PSK formats [21] and even for 8QAM [22,23]. Nevertheless, it has an inherent drawback that it converts phase noise to amplitude noise, and the latter may be converted back into phase noise by the nonlinear effect in transmission, which will seriously affect the transmission reach.…”

All-Optical Multilevel Amplitude Regeneration Based on Polarization-Orthogonal Continuous-Wave-Light-Assisted Nonlinear-Optical Loop Mirror (PC-NOLM) Subsystem

“…The associate editor coordinating the review of this manuscript and approving it for publication was Chao Zuo . regeneration could been reduced in a vector PSA process [7]. On the other hand, the nonlinear-optical loop mirror (NOLM) is a promising technology to perform all-optical amplitude regeneration through its well-known power oscillatory behavior [8].…”