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We propose and demonstrate all-optical clock recovery (CR) from both NRZ and NRZ-DPSK signals at different bit-rates, through simply preprocessing with single optical filter. Clock signal can be extracted successfully by cascading a CR unit.
All-optical clock recovery (CR) from 20-Gb/s nonreturn-to-zero differential phase-shift-keying (NRZ-DPSK) signal is demonstrated, with an all-fiber delay interferometer (DI) and a mode-locked semiconductor optical amplifier (SOA) fiber laser. The tunable DI serves as an all-optical DPSK demodulator and the phase-modulated NRZ-DPSK signal is converted into the intensity-modulated pseudoreturn-to-zero...
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