Pump-linewidth-tolerant optical wavelength conversion for high-order QAM signals using coherent pumps

Guo Wei Lu, André Albuquerque, Benjamin J. Puttnam, Takahide Sakamoto, Miguel Drummond, Rogério Nogueira, Atsushi Kanno, Satoshi Shinada, Naoya Wada, Tetsuya Kawanishi

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

Optical wavelength conversion (OWC) is expected to be a desirable function in future optical transparent networks. Since high-order quadrature amplitude modulation (QAM) is more sensitive to the phase noise, in the OWC of high-order QAM signals, it is crucial to suppress the extra noise introduced in the OWC subsystem, especially for the scenario with multiple cascaded OWCs. Here, we propose and experimentally demonstrate a pump-linewidth-tolerant OWC scheme suitable for highorder QAM signals using coherent two-tone pumps. Using 3.5-MHzlinewidth distributed feedback (DFB) lasers as pump sources, our scheme enables wavelength conversion of both 16QAM and 64QAM signals with negligible power penalty, in a periodically-poled Lithium Niobate (PPLN) waveguide based OWC. We also demonstrate the performance of pump phase noise cancellation, showing that such coherent two-tone pump schemes can eliminate the need for ultra-narrow linewidth pump lasers and enable practical implementation of low-cost OWC in future dynamic optical networks.

Original languageEnglish
Pages (from-to)5067-5075
Number of pages9
JournalOptics Express
Volume22
Issue number5
DOIs
Publication statusPublished - 2014 Mar 10
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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