Clock extraction using an optoelectronic oscillator from high-speed NRZ signal and NRZ-to-RZ format transformation

@article{Huo2003ClockEU,
  title={Clock extraction using an optoelectronic oscillator from high-speed NRZ signal and NRZ-to-RZ format transformation},
  author={Li Huo and Yi Dong and Caiyun Lou and Yizhi Gao},
  journal={IEEE Photonics Technology Letters},
  year={2003},
  volume={15},
  pages={981-983}
}
A clock extraction scheme was demonstrated using an optoelectronic oscillator from high-speed nonreturn-to-zero (NRZ) signal. A theoretical model on the locking range of the oscillator was presented. A 10-GHz clock with a timing jitter of 0.4 ps was extracted from 10-Gb/s NRZ signal and a locking range of 800 kHz was achieved. NRZ to return-to-zero (RZ) data format conversion was also performed simultaneously with the NRZ clock extraction. 
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