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Mohajerin-Ariaei A, Ziyadi M, Chitgarha MR, et al. Phase noise mitigation of QPSK signal utilizing phase-locked multiplexing of signal harmonics and amplitude saturation. Opt Lett. 2015;40(14):3328-31doi: 10.1364/OL.40.003328.
Mohajerin-Ariaei, A., Ziyadi, M., Chitgarha, M. R., Almaiman, A., Cao, Y., Shamee, B., Yang, J. Y., Akasaka, Y., Sekiya, M., Takasaka, S., Sugizaki, R., Touch, J. D., Tur, M., Langrock, C., Fejer, M. M., & Willner, A. E. (2015). Phase noise mitigation of QPSK signal utilizing phase-locked multiplexing of signal harmonics and amplitude saturation. Optics letters, 40(14), 3328-31. https://doi.org/10.1364/OL.40.003328
Mohajerin-Ariaei, Amirhossein, et al. "Phase noise mitigation of QPSK signal utilizing phase-locked multiplexing of signal harmonics and amplitude saturation." Optics letters vol. 40,14 (2015): 3328-31. doi: https://doi.org/10.1364/OL.40.003328
Mohajerin-Ariaei A, Ziyadi M, Chitgarha MR, Almaiman A, Cao Y, Shamee B, Yang JY, Akasaka Y, Sekiya M, Takasaka S, Sugizaki R, Touch JD, Tur M, Langrock C, Fejer MM, Willner AE. Phase noise mitigation of QPSK signal utilizing phase-locked multiplexing of signal harmonics and amplitude saturation. Opt Lett. 2015 Jul 15;40(14):3328-31. doi: 10.1364/OL.40.003328. PMID: 26176461.
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Opt Lett. 2015 Jul 15;40(14):3328-31. doi: 10.1364/OL.40.003328.

Phase noise mitigation of QPSK signal utilizing phase-locked multiplexing of signal harmonics and amplitude saturation.

Optics letters

Amirhossein Mohajerin-Ariaei, Morteza Ziyadi, Mohammad Reza Chitgarha, Ahmed Almaiman, Yinwen Cao, Bishara Shamee, Jeng-Yuan Yang, Youichi Akasaka, Motoyoshi Sekiya, Shigehiro Takasaka, Ryuichi Sugizaki, Joseph D Touch, Moshe Tur, Carsten Langrock, Martin M Fejer, Alan E Willner

PMID: 26176461 DOI: 10.1364/OL.40.003328

Abstract

We demonstrate an all-optical phase noise mitigation scheme based on the generation, delay, and coherent summation of higher order signal harmonics. The signal, its third-order harmonic, and their corresponding delayed variant conjugates create a staircase phase-transfer function that quantizes the phase of quadrature-phase-shift-keying (QPSK) signal to mitigate phase noise. The signal and the harmonics are automatically phase-locked multiplexed, avoiding the need for phase-based feedback loop and injection locking to maintain coherency. The residual phase noise converts to amplitude noise in the quantizer stage, which is suppressed by parametric amplification in the saturation regime. Phase noise reduction of ∼40% and OSNR-gain of ∼3  dB at BER 10(-3) are experimentally demonstrated for 20- and 30-Gbaud QPSK input signals.

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