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首页> 外文会议>Conference on Optical Transmission, Switching, and Subsystems >Chromatic Dispersion Induced PM-AM Conversion and Its Application in the All-Optical Clock Recovery of NRZ-DPSK Signals
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Chromatic Dispersion Induced PM-AM Conversion and Its Application in the All-Optical Clock Recovery of NRZ-DPSK Signals

机译：色散诱导PM-AM转换及其在NRZ-DPSK信号的全光学时钟恢复中的应用

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摘要

We investigated the property of conversion between phase modulation (PM) and amplitude modulation (AM) in optical fiber transmission link due to chromatic dispersion (CD) for the purpose of clock information generation. As a result, a novel all-optical clock recovery (CR) scheme from 10 Gbps non-return-to-zero differential phase-shift-keying (NRZ-DPSK) signal has been demonstrated experimentally. We introduce a chromatic dispersion induced clock tone from the NRZ-DPSK signal and feed it into a free-running semiconductor optical amplifier (SOA) based fiber ring laser to achieve an injection mode-locking. The generated mode-locked pulse is the corresponding regenerated clock of the original signal. Since no special component is required for NRZ-DPSK demodulation, our proposed method is very promising because of its simple configuration and higher stability. In experiments, 20km standard single mode fiber is employed to accumulate CD and generate PM-AM conversion hence regenerate clock tone of the NRZ-DPSK signal. The recovered clock signal with the extinction ratio over 15 dB and the root-mean-square timing jitter of 720 fs is achieved under 2~(31)-1 pseudorandom binary sequence NRZ-DPSK signals measurement. We also demonstrated a similar CR system by using a chirped fiber Bragg grating (CFBG) as the dispersion device. With the same operation principle, it is quite convenient and promising to extend our configuration to implement all-optical CR for NRZ-DPSK signal with data rate up to 40Gbps.
机译：我们调查了由于色散（CD）的光纤传输链路中的相位调制（PM）和幅度调制（AM）之间的转换属性，以用于时钟信息生成。结果，已经通过实验说明了来自10 Gbps非返回零差分相移键控（NRZ-DPSK）信号的新型全光学时钟恢复（CR）方案。我们从NRZ-DPSK信号引入了色散诱导的时钟音，并将其送入自由运行的半导体光放大器（SOA）光纤环激光器，以实现注射模式锁定。产生的模式锁定脉冲是原始信号的相应再生时钟。由于NRZ-DPSK解调所需的特殊组件，因此我们提出的方法非常有前途，因为其配置简单和更高的稳定性。在实验中，采用20km标准单模光纤累积CD并产生PM-AM转换，因此NRZ-DPSK信号的再生时钟色调。在2〜（31）-1伪随机二进制NRZ-DPSK信号测量下，实现了具有超过15dB的消光比的回收的时钟信号和720 fs的根平均方形时序抖动。我们还通过使用啁啾光纤布拉格光栅（CFBG）作为分散装置来展示了类似的CR系统。采用相同的操作原理，它非常方便，很有希望扩展我们的配置，为NRZ-DPSK信号实现全光学CR，数据速率高达40Gbps。

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