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19 November 2007All-optical clock recovery from NRZ signal through preprocessing by single narrow-band filter
We demonstrate a simple configuration for clock recovery from nonreturn-to-zero (NRZ) signal, which is preprocessed
by a narrow-band filter. Clock component is enhanced evidently after the filter. Compared with previous preprocessing
schemes, the single filter is simple and suitable for different bit-rates. The output performances related to the bandwidth
and the detuning of the filter are analyzed. By cascading a clock recovery unit with semiconductor optical amplifier
based fiber ring laser, clock signal can be extracted from the preprocessed signal with extinction ratio over 10 dB and
root mean square timing jitter of 900 fs, at 10 to 40 Gb/s. By simply using a filter with larger bandwidth, much higher
bit-rate operation can be achieved easily.
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Yu Yu, Xinliang Zhang, Jing Hu, Dexiu Huang, "All-optical clock recovery from NRZ signal through preprocessing by single narrow-band filter," Proc. SPIE 6783, Optical Transmission, Switching, and Subsystems V, 67832H (19 November 2007); https://doi.org/10.1117/12.746093