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A staggered differential phase-shift keying modulation format for 100Gbit/s applications.

Yufeng Shao1, Shuangchun Wen, Lin Chen

  • 1Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education, School of Computer and Communication, Hunan University, Changsha 410082, China.

Optics Express
|August 20, 2008
PubMed
Summary

We introduce staggered differential phase-shift keying (SDPSK), a new modulation format for 100 Gbit/s optical communications. SDPSK demonstrates superior nonlinear tolerance and strong transmission performance, making it ideal for high-speed networks.

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Area of Science:

  • Optical Communications
  • Digital Signal Processing

Background:

  • High-speed optical communication systems require advanced modulation formats.
  • Differential phase-shift keying (DPSK) and differential quadrature phase-shift keying (DQPSK) are established formats.
  • Limitations exist in nonlinear tolerance for current modulation schemes.

Purpose of the Study:

  • To propose and numerically demonstrate a novel phase modulation format, staggered differential phase-shift keying (SDPSK).
  • To evaluate the transmission performance of SDPSK for 100 Gbit/s applications.
  • To compare SDPSK with existing modulation formats like DPSK and DQPSK.

Main Methods:

  • Generation of Non-Return-to-Zero (NRZ) SDPSK signals using two phase modulators.
  • Generation of Return-to-Zero (RZ) SDPSK signals with 50% duty cycle via a dual-arm Mach-Zehnder modulator.

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  • Demodulation of 2 bit/symbol at a 1 bit rate using a Mach-Zehnder delay interferometer and balanced receiver.

    • Main Results:

    • SDPSK exhibits similar chromatic dispersion and polarization-mode-dispersion tolerance to conventional DPSK.
    • SDPSK demonstrates enhanced nonlinear tolerance compared to DPSK and DQPSK.
    • Optimal transmission performance for SDPSK was observed over 106km of SMF+DCF fiber, followed by a third-order Gaussian optical bandpass filter with >125GHz bandwidth.

    Conclusions:

    • SDPSK is a promising modulation format for 100 Gbit/s optical communication systems.
    • The enhanced nonlinear tolerance of SDPSK offers significant advantages for high-capacity networks.
    • SDPSK provides a robust and efficient solution for future optical transmission.