单模光纤偏振模色散对光外差CPFSK传输系统性能限制的影响

M.S. Islam, S. Majumder
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引用次数: 0

摘要

对单模光纤中偏振模色散(PMD)引起的信号相位畸变对光外差CPFSK系统误码率(BER)性能的影响进行了理论分析。考虑差分组延迟(DGD)的麦克斯韦分布,在比特率为10 Gb/s时对平均误码率性能结果进行了评估。结果表明,当误码率为10 -9、工作速度为10gb /s时,光外差CPFSK直接检测系统的平均DGD分别为20ps、30ps、40ps和60ps时,功率损失分别为0.75 dB、1.95 dB、4.00 dB和9.15 dB。此外,当平均DGD值增加时,出现10-9以上的误码率层,不能通过进一步增加信号功率来降低。在10gb /s和调制指数为0.50的情况下,当平均DGD分别为60ps、70ps和80ps时,BER层分别出现在约2倍10-8、10-5和2.5倍10-4。在较高的调制指数下,PMD的影响更为有害
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Performance Limitations of an Optical Heterodyne CPFSK Transmission System Affected by Polarization Mode Dispersion in a Single Mode Fiber
A theoretical analysis is developed to evaluate the bit error rate (BER) performance degradation of an optical heterodyne CPFSK system caused by signal phase distortion due to polarization mode dispersion (PMD) in a single mode fiber. The average BER performance results are evaluated at a bit rate of 10 Gb/s considering Maxwellian distribution for the differential group delay (DGD). The results show that the performance of optical heterodyne CPFSK direct detection system suffers power penalty of 0.75 dB, 1.95 dB, 4.00 dB and 9.15 dB corresponding to mean DGD of 20 ps, 30 ps, 40 ps and 60 ps respectively at a BER of 10 -9 operating at 10 Gb/s. Furthermore, at increased values of the mean DGD there occur BER floors above 10-9, which can not be lowered by further increasing the signal power. It is noticed that BER floors occur at about 2times10-8, 10-5 and 2.5times10-4 corresponding to mean DGD of 60 ps, 70 ps and 80 ps respectively at 10 Gb/s and modulation index of 0.50. The effect of PMD is found to be more detrimental at higher modulation index
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