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Optics Express

Phase regeneration of phase encoded signals by hybrid optical phase squeezer

Takayuki Kurosu, Mingyi Gao, Karen Solis-Trapala, Shu Namiki

Published May 13, 2014• 19 citations
Publisher

Abstract

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.

DOI
10.1364/oe.22.012177

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Signal phase regeneration through multiple wave coherent addition enabled by hybrid optical phase squeezer

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A newly proposed concept, which is called hybrid optical phase squeezer (HOPS), achieves multi-level optical phase quantization through coherent addition of two (dual-wave scheme) or three (triple-wave scheme) optical waves exploiting optical parametric processes and electro-optic modulation. The triple-wave scheme enables signal phase regeneration free from phase-to-amplitude noise transfer, which is inevitable in the dual-wave scheme. By using HOPS in the dual-wave scheme, 3-fold phase-noise reduction was achieved for 24-Gb/s QPSK signals with a slight increase of amplitude noise. On the other hand, HOPS in the triple-wave scheme allowed phase regeneration of 12-Gb/s BPSK signal with a suppression of phase-to-amplitude noise transfer.

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All-Optical Multi-Level Phase Quantization Based on Phase-Sensitive Amplification With Low-Order Harmonics

Hongxiang Wang, Limeng Pan, Feifei Lu +3 more

A novel scheme is proposed for all-optical multilevel phase quantization by mixing two lower-order harmonics, rather than mixing the signal with its conjugate (M - 1)th harmonic, which is difficult to be generated but necessary for the traditional quantization method. The low-order harmonics used in the proposed scheme are determined as the conjugate (M/2 - 1)th and the (M/2 + 1)th harmonics for M = 4n, or the conjugate (M/2 - 2)th and the (M/2 + 2)th harmonics for M = 4n + 2, or the conjugate [(M - 1)/2]th and the [(M + 1)/2]th harmonics for M = 2n + 1, n = 1, 2, 3 . . .. The simulations show the effectiveness of the scheme for the eightand nine-level all-optical phase quantization. Furthermore, the application of the scheme to the all-optical phase regeneration is validated. An improved method with two cascading stages is also proposed and validated to achieve a monotonic step-like phase- phase transfer characteristic for the optimized all-optical phase quantization. This proposed scheme provides a new way for multilevel phase quantization and multi-level phase shift keying regeneration to meet the ever increasing demand for the bandwidth in fiber-optic communication.

Journal of Lightwave Technology•Nov 7, 2018•8 citations
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.
A newly proposed concept, which is called hybrid optical phase squeezer (HOPS), achieves multi-level optical phase quantization through coherent addition of two (dual-wave scheme) or three (triple-wave scheme) optical waves exploiting optical parametric processes and electro-optic modulation. The triple-wave scheme enables signal phase regeneration free from phase-to-amplitude noise transfer, which is inevitable in the dual-wave scheme. By using HOPS in the dual-wave scheme, 3-fold phase-noise reduction was achieved for 24-Gb/s QPSK signals with a slight increase of amplitude noise. On the other hand, HOPS in the triple-wave scheme allowed phase regeneration of 12-Gb/s BPSK signal with a suppression of phase-to-amplitude noise transfer.
A novel scheme is proposed for all-optical multilevel phase quantization by mixing two lower-order harmonics, rather than mixing the signal with its conjugate (M - 1)th harmonic, which is difficult to be generated but necessary for the traditional quantization method. The low-order harmonics used in the proposed scheme are determined as the conjugate (M/2 - 1)th and the (M/2 + 1)th harmonics for M = 4n, or the conjugate (M/2 - 2)th and the (M/2 + 2)th harmonics for M = 4n + 2, or the conjugate [(M - 1)/2]th and the [(M + 1)/2]th harmonics for M = 2n + 1, n = 1, 2, 3 . . .. The simulations show the effectiveness of the scheme for the eightand nine-level all-optical phase quantization. Furthermore, the application of the scheme to the all-optical phase regeneration is validated. An improved method with two cascading stages is also proposed and validated to achieve a monotonic step-like phase- phase transfer characteristic for the optimized all-optical phase quantization. This proposed scheme provides a new way for multilevel phase quantization and multi-level phase shift keying regeneration to meet the ever increasing demand for the bandwidth in fiber-optic communication.