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Study on the PMD impairment of optical multilevel DPSK systems and its mitigation methods

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3 Author(s)
Hosung Yoon ; Sch. of Electr. Eng. & Comput. Sci., Seoul Nat. Univ., South Korea ; Na Young Kim ; Namkyoo Park

We examine the polarization-mode dispersion (PMD) impairment of optical multilevel differential phase-shift keying systems, and also its mitigation method by comparing the electrical equalization technique and the receiver bandwidth optimization. Analysis has been carried out with 40-Gb/s systems experiencing 0∼60 ps of instantaneous differential group delay, corresponding up to 240%/80% of bit/symbol transmission rate. Results show considerable improvement in the PMD tolerance for return-to-zero format for the optimized receiver bandwidth either with or without the electrical equalization. For nonreturn-to-zero, the bandwidth optimization alone does not significantly improve the system's PMD tolerances.

Published in:

Photonics Technology Letters, IEEE  (Volume:17 ,  Issue: 12 )