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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 5 — Mar. 10, 2014
  • pp: 5067–5075

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, and Tetsuya Kawanishi  »View Author Affiliations


Optics Express, Vol. 22, Issue 5, pp. 5067-5075 (2014)
http://dx.doi.org/10.1364/OE.22.005067


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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 high-order QAM signals using coherent two-tone pumps. Using 3.5-MHz-linewidth 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.

© 2014 Optical Society of America

OCIS Codes
(060.1660) Fiber optics and optical communications : Coherent communications
(060.5060) Fiber optics and optical communications : Phase modulation
(060.1155) Fiber optics and optical communications : All-optical networks
(230.7405) Optical devices : Wavelength conversion devices

ToC Category:
Nonlinear Optics

History
Original Manuscript: December 30, 2013
Revised Manuscript: February 14, 2014
Manuscript Accepted: February 16, 2014
Published: February 25, 2014

Citation
Guo-Wei Lu, André Albuquerque, Benjamin J. Puttnam, Takahide Sakamoto, Miguel Drummond, Rogério Nogueira, Atsushi Kanno, Satoshi Shinada, Naoya Wada, and Tetsuya Kawanishi, "Pump-linewidth-tolerant optical wavelength conversion for high-order QAM signals using coherent pumps," Opt. Express 22, 5067-5075 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-5-5067


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