Abstract

All-optical clock recovery for the return-to-zero modulation format is demonstrated experimentally at $40\mathrm{G}\text{bits}/\mathrm{s}$ by using an amplified feedback laser. A $40\mathrm{GHz}$ optical clock with a root-mean-square (rms) timing jitter of $130\mathrm{fs}$ and a carrier-to-noise ratio of $42\mathrm{dB}$ is obtained. Also, a $40\mathrm{GHz}$ optical clock with timing jitter of $137\mathrm{fs}$ is directly recovered from pseudo-non-return-to-zero signals degraded by polarization-mode dispersion (PMD). No preprocessing stage to enhance the clock tone is used. The rms timing jitter of the recovered clock is investigated for different values of input power and for varying amounts of waveform distortion due to PMD.

© 2010 Optical Society of America

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