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Published on: February 6, 2014

Modified constant modulus algorithm for polarization-switched QPSK.

Pontus Johannisson1, Martin Sjödin, Magnus Karlsson

  • 1Photonics Laboratory, Department of Microtechnology and Nanoscience, Chalmers University of Technology, SE-412 96 Göteborg, Sweden.

Optics Express
|April 20, 2011
PubMed
Summary
This summary is machine-generated.

A modified constant modulus algorithm (CMA) enables polarization demultiplexing and equalization for polarization-switched QPSK. This new algorithm shows performance comparable to the conventional CMA for polarization-multiplexed QPSK.

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Area of Science:

  • Optical communications
  • Signal processing

Background:

  • Polarization-switched quadrature phase-shift keying (QPSK) presents challenges in signal demultiplexing and equalization.
  • Existing constant modulus algorithms (CMAs) are effective for polarization-multiplexed QPSK but not directly applicable to polarization-switched QPSK.

Purpose of the Study:

  • To develop a modified constant modulus algorithm (CMA) capable of handling polarization-switched QPSK.
  • To implement a system allowing seamless switching between conventional and modified CMA.

Main Methods:

  • A generalized cost function was utilized to derive the modified CMA.
  • Numerical simulations were performed to evaluate the algorithm's performance.

Main Results:

  • The modified CMA successfully achieves polarization demultiplexing and equalization for polarization-switched QPSK.
  • The algorithm demonstrates performance similar to the conventional CMA in polarization-multiplexed QPSK scenarios.

Conclusions:

  • The proposed modified CMA is an effective solution for polarization-switched QPSK systems.
  • The developed implementation offers practical advantages for system flexibility and performance optimization.