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We investigated the effect of residual chromatic dispersion on phase-sensitive amplification of 20Gbaud 16QAM signals experimentally. We observed negligible impacts on amplification although the constellation is degraded in proportion to the amount of CD.
The coherent signal processing of nonlinear wave mixing often creates interferometers that require feedback stabilization. A digital electronic optical phase stabilizer is described that avoids injecting pilot control signals and supports long-duration BER measurements.
We demonstrate a data pattern correlator for OOK and BPSK signals that can simultaneously search for multiple patterns using optical sampling via wavelength conversion. We show reconfiguration times as low as 100 ps for the search pattern update in the correlator.
A first practical 4-stage compensator with ∼1-ms response time is demonstrated for mitigating first- and second-order PMD on 40-Gbit/s RZ-D(Q)PSK. BER and DOP degradations are significantly improved and a power penalty of <0.5-dB is achieved at 10−9 BER under 25-ps DGD and 400-ps2 SOPMD.
We experimentally demonstrate a chromatic dispersion monitoring technique utilizing a delay-line interferometer and a <;10-GHz photodetector for 40-Gb/s OOK/DPSK. Spectral shift of RF dip changing with up to 560-ps/nm-CD is measured insensitive to 23-ps-DGD and <;15-dB-OSNR.
We propose and experimentally demonstrate an all-optical chromatic dispersion (CD) monitoring technique for phase-modulated signals utilizing the cross-phase-modulation effect between the input signal and the inserted continuous-wave probe. The probe's optical spectrum changes with the accumulated CD on the input signal, indicating that the optical power variations can be measured for monitoring....
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