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All-Optical Clock Recovery From NRZ-DPSK Signal

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3 Author(s)
Yu Yu ; Wuhan Nat. Lab. for Optoelectronics & the Inst. of Optoelectronics Sci. & Eng., Huazhong Univ. of Sci. & Technol., Wuhan ; Xinliang Zhang ; Dexiu Huang

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 (PRZ) signal, with the enhancement of the clock component. Followed SOA fiber-laser is used to achieve CR from the PRZ signal. Fixed bit pattern and 231-1 pseudorandom binary sequence NRZ-DPSK signals are used to test the performance of the proposed system. It is shown that the recovered clock signal with the extinction ratio over 10 dB and the root-mean-square timing jitter of 800 fs can be achieved

Published in:

IEEE Photonics Technology Letters  (Volume:18 ,  Issue: 22 )