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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 1 — Jan. 13, 2014
  • pp: 15–22

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

Guo-Wei Lu, Takahide Sakamoto, and Tetsuya Kawanishi  »View Author Affiliations


Optics Express, Vol. 22, Issue 1, pp. 15-22 (2014)
http://dx.doi.org/10.1364/OE.22.000015


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Abstract

All-optical wavelength conversion (AOWC) plays an important role in the future transparent optical networks, in order to enhance the re-configurability 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 high-order 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 four-wave 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.

© 2013 Optical Society of America

OCIS Codes
(060.1660) Fiber optics and optical communications : Coherent communications
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.4370) Fiber optics and optical communications : Nonlinear optics, fibers
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing

ToC Category:
Fibers, Fiber Devices, and Amplifiers

History
Original Manuscript: October 7, 2013
Revised Manuscript: December 2, 2013
Manuscript Accepted: December 2, 2013
Published: December 20, 2013

Virtual Issues
European Conference and Exhibition on Optical Communication (2013) Optics Express

Citation
Guo-Wei Lu, Takahide Sakamoto, and Tetsuya Kawanishi, "Wavelength conversion of optical 64QAM through FWM in HNLF and its performance optimization by constellation monitoring," Opt. Express 22, 15-22 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-1-15


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References

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