Wavelength conversion of optical 64QAM through FWM in HNLF and its performance optimization by constellation monitoring

Guo Wei Lu, Takahide Sakamoto, Tetsuya Kawanishi

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

All-optical wavelength conversion (AOWC) plays an important role in the future transparent optical networks, in order to enhance the reconfigurability and non-blocking capacity. On the other hand, high-order quadrature amplitude modulations (QAMs) have been extensively studied for achieving the high-speed and high-spectral-efficiency optical transmission. Since high-order QAMs are more sensitive to phase and amplitude noise, to implement an AOWC sub-system suitable for highorder QAM signals with minimized power penalty, it is important to optimize the operation conditions in order to avoid extra nonlinear distortions co-existed in the AOWC process. Our experimental results show that, constellation monitoring provides a more intuitive and accurate approach to monitor the converted high-order QAM signals, especially in presence of nonlinear phase noise such as self-phase modulation (SPM). We experimentally demonstrate an AOWC of 64QAM signal through fourwave mixing (FWM) in highly-nonlinear (HNLF). The performance of the AOWC is optimized through the constellation monitoring of the converted signal, achieving a negligible power penalty (<0.3dB at BER of 10-3) for 60-Gbps 64QAM after conversion.

Original languageEnglish
Pages (from-to)15-22
Number of pages8
JournalOptics Express
Volume22
Issue number1
DOIs
Publication statusPublished - 2014 Jan 13
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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