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Proceedings Article

Performance evaluation of 6-level PSK signal using differential demodulation with partial symbol delay

[+] Author Affiliations
H. Y. Choi, I. Morita

KDDI R&D Labs., Inc. (Japan)

Proc. SPIE 8309, Optical Transmission Systems, Subsystems, and Technologies IX, 83091Z (December 14, 2011); doi:10.1117/12.905540
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From Conference Volume 8309

  • Optical Transmission Systems, Subsystems, and Technologies IX
  • Xiang Liu
  • Shanghai, China | November 13, 2011

abstract

We demonstrate an optical transmission system based on a 6-level PSK modulation format and differential detection with a partial symbol delay. The 6-level PSK signal is simply generated by using a chirp-free Mach-Zehnder modulator followed by a phase modulator. In order to convert the phase information of the 6-level PSK signal into the intensity, we utilize a pair of two Mach-Zehnder delay-line interferometers with having a differential delay less than the symbol duration of the signal unlike a conventional differential detection scheme. We evaluate the performances of the differential 6-level PSK signal and compare them with that of a conventional DQPSK signal. In addition, the transmission performance of the 21.4-Gb/s 6-level PSK signal is experimentally verified in a 240-km long dispersionmanaged fiber link. Furthermore, additional simulation results show that the tolerance to optical filtering and chromatic dispersion of the 107-Gb/s differential 6-level PSK signal is improved significantly by adopting the partial demodulation scheme.

© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

H. Y. Choi and I. Morita
"Performance evaluation of 6-level PSK signal using differential demodulation with partial symbol delay", Proc. SPIE 8309, Optical Transmission Systems, Subsystems, and Technologies IX, 83091Z (December 14, 2011); doi:10.1117/12.905540; http://dx.doi.org/10.1117/12.905540


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