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首页> 外文期刊>Optical engineering >Analytical evaluation of the combined influence of polarization mode dispersion and group velocity dispersion on the bit error rate performance of optical homodyne quadrature phase-shift keying systems
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Analytical evaluation of the combined influence of polarization mode dispersion and group velocity dispersion on the bit error rate performance of optical homodyne quadrature phase-shift keying systems

机译：偏振模色散和群速度色散对光学零差正交相移键控系统误码率性能综合影响的分析评估

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摘要

A theoretical approach is presented to evaluate the bit error rate (BER) performance of an optical fiber transmission system with quadrature phase-shift keying (QPSK) modulation under the combined influence of polarization mode dispersion (PMD) and group velocity dispersion (GVD) in a single-mode fiber (SMF). The analysis is carried out without and with polarization division multiplexed (PDM) transmission considering a coherent homodyne receiver. The probability density function (pdf) of the random phase fluctuations due to PMD and GVD at the output of the receiver is determined analytically, considering the pdf of differential group delay (DGD) to be Maxwellian distribution and that of GVD to be Gaussian approximation. The exact pdf of the phase fluctuation due to PMD and GVD is also evaluated from its moments using a Monte Carlo simulation technique. Average BER is evaluated by averaging the conditional BER over the pdf of the random phase fluctuation. The BER performance results are evaluated for different system parameters. It is found that PDM-QPSK coherent homodyne system suffers more power penalty than the homodyne QPSK system without PDM. A PDM-QPSK system suffers a penalty of 4.3 dB whereas power penalty of QPSK system is 3.0 dB at a BER of 10~(-9) for DGD of 0.8 T_b and GVD of 1700 psm. Analytical results are compared with the experimental results reported earlier and found to have good conformity.
机译：提出了一种理论方法来评估偏振模色散（PMD）和组速度色散（GVD）组合影响下具有正交相移键控（QPSK）调制的光纤传输系统的误码率（BER）性能。单模光纤（SMF）。考虑相干零差接收器，可以在不使用偏振分复用（PDM）传输和不使用偏振分复用（PDM）传输的情况下进行分析。通过解析确定接收器输出端由PMD和GVD引起的随机相位波动的概率密度函数（pdf），考虑差分群时延（DGD）的pdf为麦克斯韦分布，而GVD的pdf为高斯近似。还使用蒙特卡罗模拟技术从力矩中评估了由于PMD和GVD而引起的相位波动的精确pdf。平均BER通过对随机相位波动pdf上的条件BER进行平均来评估。针对不同的系统参数评估了BER性能结果。发现与没有PDM的零差QPSK系统相比，PDM-QPSK相干零差系统遭受更多的功率损失。对于DGD为0.8 T_b和GVD为1700 ps / nm的PDM-QPSK系统，其功耗为4.3 dB，而BER为10〜（-9）时，QPSK系统的功耗为3.0 dB。将分析结果与之前报道的实验结果进行比较，发现它们具有良好的一致性。

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