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All -optical regeneration for phase-shift keyed optical communication systems.

机译：相移键控光通信系统的全光再生。

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摘要

All-optical signal processing techniques for phase-shift keyed (PSK) systems were developed theoretically and demonstrated experimentally. Nonlinear optical effects in fibers, in particular four-wave mixing (FWM) that occurs via the ultra-fast Kerr nonlinearity, offer a flexible framework within which numerous signal processing functions can be accomplished. This research has focused on the regenerative capabilities of various FWM configurations in the context of processing PSK signals. Phase-preserving amplitude regeneration, phase regeneration, and phase-regenerative wavelength conversion are analyzed and demonstrated experimentally.;The single-pump phase-conjugation process was used to regenerate RZ-DPSK pulse amplitudes with different input noise distributions, and the impact on output phase characteristics was studied. Experiments revealed a limited range over which amplitude noise could effectively be suppressed without introduction of phase noise, particularly for signals with intensity pattern effects.;Phase regeneration requires use of phase-sensitive amplification (PSA), which occurs in nonlinear interferometers when the pump and signal frequencies are degenerate (NI-PSA), or in fiber directly through single-stage (degenerate) or cascaded (non-degenerate) FWM processes. A PSA based on a Sagnac interferometer provided the first experimental demonstration of DPSK phase and amplitude regeneration. The phase-regenerative capabilities of the NI-PSA are limited in practice by intrinsic noise conversion (amplitude to phase noise) and to a lesser extent by the requirement to modulate the pump wave to suppress stimulated Brillouin scattering (SBS). These limitations are relaxed in novel materials with higher SBS thresholds and nonlinearities. Degenerate FWM provides PSA in a traveling-wave configuration that intrinsically suppresses the noise conversion affecting the NI-PSA, while providing stronger phase-matched gain. Experiments confirmed superior phase-regenerative behavior to the NI-PSA with simultaneous reduction of amplitude noise for NRZ-DPSK signals.;Phase-regenerative wavelength conversion (PR-WC) provides the regenerative properties of PSA at a new wavelength, and was proposed and demonstrated for the first time in this research. The parallel implementation of two FWM processes, phase-conjugation and frequency conversion, provides two idlers which exhibit interesting and useful regenerative properties. These were investigated theoretically and experimentally. Ideal phase-regenerative behavior is predicted when the contributing FWM processes are equally phase-matched, which can be maintained over any interaction length or wavelength shift provided the pump powers are properly adjusted. Depleted-pump regime PR-WC provides simultaneous phase and amplitude regeneration. Experiments confirmed regenerative behavior for wavelength shifts of the idlers up to 5 nm.;Two techniques for phase regeneration of 4-level PSK signals were developed and evaluated. The first is based on parallel operation of PSAs suitable for processing 2-level PSK signals, where phase projection and regeneration are combined to recover the input data. Analysis of this scheme outlined the conditions required for effective phase regeneration and for practical implementation using known PSAs. A novel process based on FWM (parallel phase-conjugation followed by PSA) was developed and analyzed, and demonstrated using numerical simulations. These studies provide a basis for further work in this area.
机译：理论上开发了用于相移键控（PSK）系统的全光信号处理技术，并进行了实验验证。光纤中的非线性光学效应，特别是通过超快Kerr非线性而发生的四波混频（FWM），提供了一个灵活的框架，可以在其中完成许多信号处理功能。这项研究集中于在处理PSK信号的情况下各种FWM配置的再生能力。分析并通过实验验证了保相幅度再生，相位再生和相位再生波长转换。；采用单泵相位共轭过程再生具有不同输入噪声分布的RZ-DPSK脉冲幅度，以及对输出的影响研究了相特征。实验揭示了在不引入相位噪声的情况下可以有效抑制幅度噪声的有限范围，特别是对于具有强度模式效应的信号;相位再生需要使用相敏放大（PSA），这在非线性干涉仪中发生信号频率可以是简并（NI-PSA），也可以直接在光纤中通过单级（简并）或级联（非简并）FWM过程获得。基于Sagnac干涉仪的PSA提供了DPSK相位和幅度再生的第一个实验演示。实际上，NI-PSA的相位再生能力受到固有噪声转换（幅度到相位噪声）的限制，并且在较小程度上受到调制泵浦波以抑制受激布里渊散射（SBS）的要求的限制。在具有更高SBS阈值和非线性的新型材料中，这些限制得到了缓解。简并FWM在行波配置中提供了PSA，其本质上抑制了影响NI-PSA的噪声转换，同时提供了更强的相位匹配增益。实验证实了相变特性优于NI-PSA，同时降低了NRZ-DPSK信号的幅度噪声。相再生波长转换（PR-WC）提供了PSA在新波长下的再生特性，并提出并在本研究中首次展示。两个FWM过程（相位共轭和频率转换）的并行执行提供了两个惰轮，它们表现出有趣且有用的再生特性。这些在理论上和实验上进行了研究。当贡献的FWM过程相等匹配时，可以预测理想的相再生行为，只要适当调整泵浦功率，就可以在任何相互作用长度或波长偏移下保持理想的相再生行为。贫泵状态PR-WC可同时进行相位和幅度再生。实验证实了对于惰轮的波长偏移直至5 nm的再生行为。;开发并评估了两种用于4级PSK信号相位再生的技术。首先是基于PSA的并行操作，该PSA适合于处理2级PSK信号，其中相投影和再生相结合以恢复输入数据。该方案的分析概述了有效相再生和使用已知PSA的实际实施所需的条件。开发并分析了一种基于FWM（平行相位共轭，后接PSA）的新颖工艺，并使用数值模拟进行了演示。这些研究为该领域的进一步工作提供了基础。

著录项

  • 作者

    Croussore, Kevin.;

  • 作者单位

    University of Central Florida.;

  • 授予单位 University of Central Florida.;
  • 学科 Optics.
  • 学位 Ph.D.
  • 年度 2007
  • 页码 197 p.
  • 总页数 197
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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