Nonsingular Constant Modulus Equalizer for PDM-QPSK Coherent Optical Receivers

作者：Vgenis Athanasios^*; Petrou Constantinos S; Papadias Constantinos B; Roudas Ioannis; Raptis Lambros

来源：IEEE Photonics Technology Letters, 2010, 22(1): 45-47.

DOI：10.1109/LPT.2009.2035820

• Coherent detection
• constant modulus algorithm (CMA)
• polarization-division multiplexing (PDM)

Adaptive electronic equalizers using the constant modulus algorithm (CMA) algorithm often converge to a singular coefficient matrix that produces the same signal at multiple outputs. We address this issue in the context of optical communications systems with polarization-division multiplexing and coherent receivers. We study, by computer simulation, the performance of multiuser CMA equalizer, an enhanced CMA equalizer initially proposed for use in wireless multiuser and later multiple-input/multiple-output communications systems. We show that the proposed adaptive electronic equalizer does not exhibit singularities and, therefore, is superior to the commonly used CMA equalizer.

• 出版日期2010-1-1