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Opto-Electronics and Communications Conference (OECC)

Phase regeneration of QPSK signals by hybrid optical phase squeezer

Takayuki Kurosu, Hung Nguyen Tan, Karen Solis-Trapala, Shu Namiki

Published Jun 1, 2015• 3 citations
Publisher

Abstract

We demonstrate phase regeneration of 24-Gb/s QPSK signals using hybrid optical phase squeezer. Heavily phase-noise loaded signals experienced a more than 3-fold phase-noise decrease. A quality factor enhancement by more than 3dB is also demonstrated.
DOI
10.1109/oecc.2015.7340237

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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.