Title :
Study on the PMD impairment of optical multilevel DPSK systems and its mitigation methods
Author :
Yoon, Hosung ; Kim, Na Young ; Park, Namkyoo
Author_Institution :
Sch. of Electr. Eng. & Comput. Sci., Seoul Nat. Univ., South Korea
Abstract :
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.
Keywords :
decision feedback equalisers; differential phase shift keying; optical fibre communication; optical fibre dispersion; optical fibre polarisation; optical receivers; 0 to 60 ps; PMD impairment; PMD tolerance; differential phase-shift keying systems; electrical equalization; instantaneous differential group delay; mitigation methods; nonreturn-to-zero format; optical multilevel DPSK systems; polarization-mode dispersion; receiver bandwidth optimization; return-to-zero format; Bandwidth; Differential quadrature phase shift keying; Equalizers; Optical distortion; Optical feedback; Optical filters; Optical modulation; Optical noise; Optical receivers; Optical transmitters; Adaptive equalizers; differential phase-shift keying (DPSK); optical fiber communication; optical fiber dispersion;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2005.859158
