Abstract

All-optical clock recovery for the return-to-zero modulation format is demonstrated experimentally at 40Gbits/s by using an amplified feedback laser. A 40GHz optical clock with a root-mean-square (rms) timing jitter of 130fs and a carrier-to-noise ratio of 42dB is obtained. Also, a 40GHz optical clock with timing jitter of 137fs 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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