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Cross polarization interference cancellation for coherent fiber optics.

机译：相干光纤的交叉极化干扰消除。

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摘要

Coherent optical communication systems offer advantages over IM-DD systems such as higher receiver sensitivity and more efficient use of the optical channel bandwidth. One disadvantage of coherent systems is the need to address the polarization sensitivity of the coherent optical receiver. This receiver can only detect the component of the signal with the same polarization as the optical local oscillator, and the orthogonal component is lost. On the other hand, this property can be used to increase the system capacity by allowing the transmission of independent signals with orthogonal polarization. A receiver can reconstruct both signals as long as they remain orthogonally polarized by tracking the polarization of each. Since orthogonality is lost to some extent during propagation through optical fiber, a polarization tracking system would incur a signal crosstalk penalty. A new and practical method using cross polarization interference cancellation is proposed to correct for the loss of orthogonality incurred during propagation between two optical signals transmitted with orthogonal polarization states. The system optimally reconstructs both signals at the receiver and eliminates the need for polarization tracking.; A new result for the bit error rate of DPSK using delay demodulation is also derived. Previous work on the BER performance of DPSK has shown that delay demodulators with narrowband IF bandpass filters and sampling detectors have superior performance than those with wideband IF bandpass filters and integrating detectors in the presence of AWGN alone. This has not been shown to be true when phase noise effects are included. Phase noise is an important consideration in coherent optical communication systems and the most widely accepted model is a Wiener phase noise process. A closed form BER expression along with detailed monte-carlo simulation results are presented for the DPSK delay demodulator with wideband IF bandpass filtering and integration detection filtering including phase noise effects using the Wiener process model. It is found that this receiver has noise performance comparable to receivers with narrowband IF bandpass filtering and sampling detectors for SNR and phase noise in the range of practical interest but with potentially less degradation due to ISI.
机译：相干光通信系统具有优于IM-DD系统的优势，例如更高的接收器灵敏度和对光信道带宽的更有效利用。相干系统的一个缺点是需要解决相干光接收机的偏振灵敏度。该接收器只能检测与光本地振荡器具有相同偏振度的信号分量，并且正交分量会丢失。另一方面，通过允许传输正交极化的独立信号，可以使用此属性来增加系统容量。接收器可以通过跟踪两个信号的极化来重构两个信号，只要它们保持正交极化即可。由于在通过光纤传播期间正交性在某种程度上会丢失，因此偏振跟踪系统会产生信号串扰损失。提出了一种使用交叉偏振干扰消除的实用新方法，以校正在以正交偏振态传输的两个光信号之间传播期间所引起的正交性损失。该系统可以在接收器上最佳地重建两个信号，并且不需要极化跟踪。还得出了使用延迟解调的DPSK误码率的新结果。先前关于DPSK的BER性能的研究表明，仅在AWGN的情况下，具有窄带IF带通滤波器和采样检测器的延迟解调器的性能要优于具有宽带IF带通滤波器和集成检测器的延迟解调器。当包括相位噪声效应时，这还没有被证明是正确的。相位噪声是相干光通信系统中的重要考虑因素，最广泛接受的模型是维纳相位噪声过程。针对带有宽带IF带通滤波和积分检测滤波的DPSK延迟解调器，使用维纳过程模型，给出了闭式BER表达式以及详细的蒙特卡洛仿真结果。发现该接收机的噪声性能可与具有窄带IF带通滤波和采样检测器的SNR和相位噪声的接收机相比，具有实用意义，但由于ISI而引起的劣化可能较小。

著录项

  • 作者

    Core, Mark T.;

  • 作者单位

    University of California, Irvine.;

  • 授予单位 University of California, Irvine.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 1999
  • 页码 90 p.
  • 总页数 90
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

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