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IEEE photonics journal

All-Optical Phase Quantization with High Accuracy Based on a Multiwave Interference Phase Sensitive Amplifier

Hongxiang Wang, Chaojie He, Gen Li, Yuefeng Ji

Published May 15, 2017• 7 citations
Publisher

Abstract

A scheme of all-optical multilevel phase quantization with high accuracy based on multiwave interference is proposed. The influences of the amplitude ratios of the conjugate (N - 1)th and (N + 1)th harmonics to the signal on phase quantization accuracy are researched. The characteristics of the phase quantization output with the amplitude ratios variation are discovered. By using the proposed scheme, the output phase is more concentrated than that of the traditional method for multilevel phase quantization. The simulations show the effectiveness of the scheme for the three levels quantization and the application of four levels quantization to the quadrature phase shift keying signal regeneration.

DOI
10.1109/jphot.2017.2703812

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A scheme of all-optical multilevel phase quantization with high accuracy based on multiwave interference is proposed. The influences of the amplitude ratios of the conjugate (N - 1)th and (N + 1)th harmonics to the signal on phase quantization accuracy are researched. The characteristics of the phase quantization output with the amplitude ratios variation are discovered. By using the proposed scheme, the output phase is more concentrated than that of the traditional method for multilevel phase quantization. The simulations show the effectiveness of the scheme for the three levels quantization and the application of four levels quantization to the quadrature phase shift keying signal regeneration.
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A detailed derivation is presented for the analytical solution of the optimal amplitude ratio m between the signal and its harmonic for M-level optical phase quantization of a signal with uniform phase distribution based on the phase sensitive amplification. A new method is proposed to evaluate the performance of phase quantization by calculating the first-order absolute central moment of the phase of the quantized signals. The constellations and phase distribution histograms with different amplitude ratios are simulated, and the first-order absolute central movement is calculated to validate the analytical solution of the optimal amplitude ratio. We also obtain the optimal amplitude ratio m for phase regeneration of signals with Gaussian phase noise based on the dual-wave interference, as well as the amplitude ratios (m, n) of three-level optical phase quantization based on the triple-wave interference, and we prove the accuracy improvement of phase quantization based on the triple-wave interference through calculation. The constellations, as well as the phase distribution histograms of the triple-wave interference are simulated, and the first-order absolute central moment is calculated to prove the accuracy improvement.
We present a new method to perform phase regeneration of phase encoded signals. In our concept called "hybrid optical phase squeezer (HOPS)," a multilevel phase-quantized signal is synthesized through the coherent addition of a phase-conjugate copy of the signal and a phase harmonic of the signal with a frequency shifter. Unlike the conventional method by phase sensitive amplification, HOPS does not use any optical parametric gain such that only optical elements with low optical nonlinearity are necessary for optical phase quantization. In the proof-of-concept experiment, it is confirmed that a 2-level HOPS can perform quadrature squeezing with an extinction ratio of 40 dB. Simultaneous phase regeneration of two coherent wavelength-division-multiplexed 10.75-Gb/s binary phase-shift keyed signals is successfully demonstrated using a 2-level HOPS based on a semiconductor optical amplifier.
In this paper, we propose and demonstrate simultaneous phase regeneration of four different channels of QPSK signal based on phase sensitive amplification. The configuration can be divided into two parts. The first one uses four wave mixing in high nonlinear fiber (HNLF) to generate the corresponding three harmonic conjugates precisely at the frequency of the original signals. The other one uses optical combiner to realize coherent addition which is aimed at completely removing the interaction in phase regeneration stage. The simulation results suggest that this scheme can optimize signal constellation to a large extend especially in high noise environment. Besides, optical signal to noise ratio (OSNR) can improve more than 3 dB while the bit-error-rate (BER) reaches 10 –3 with a constant white noise and 15° phase noise.