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Nonlinearity-assisted all-optical clock recovery for phase modulated lightwave systems
Published in Institute of Electrical and Electronics Engineers Inc.

We report all-optical clock recovery from 10 GBaud NRZ shaped lightwave signals in QPSK and 16QAM formats through injection mode-locking of an Erbium-doped fiber laser. Since these optical NRZ phase modulated coherent signals lack in the strength of the clock tones, a pre-processing stage for the enhancement of these clock tones based on a nonlinear semiconductor optical amplifier (SOA) is employed. Optical clock recovery is demonstrated experimentally for both modulation formats, along with wavelength tunability of the scheme over the entire C-band. Resilience of the clock recovery process to input OSNR conditions is also demonstrated. The RMS timing jitter of the recovered clock is measured to be ≥2 ps. We also report the performance analysis of the scheme for coherent modulation formats with respect to the dispersion-induced degradation in practical links through simulations and experiments. IEEE

About the journal
JournalData powered by TypesetIEEE Journal of Selected Topics in Quantum Electronics
PublisherData powered by TypesetInstitute of Electrical and Electronics Engineers Inc.