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All-optical phase-preserving amplitude regeneration is an effective method to reduce nonlinear phase noise in long-haul transmission of phase-modulated signals. Here we review the latest results on a proposed differential phase shift keying (DPSK) regeneration scheme exploiting a compact architecture based on a saturated semiconductor optical amplifier. The scheme allows for amplitude-only signal...
The static and dynamic characteristics of four-wave mixing in quantum dot semiconductor optical amplifiers are investigated. A high chip conversion efficiency of -2 dB at 0.6 nm detuning, a low (<; 5 dB) asymmetry of up-and down-conversion and a spectral range of 15 nm in which an optical signal-to-noise ratio above 20 dB is achieved. Relaxation times different for electrons and holes, 210 fs and...
All-optical wavelength conversion of an 80 Gb/s RZ-DQPSK signal is demonstrated for the first time based on four-wave mixing in a semiconductor optical amplifier. Error-free operation is successfully obtained.
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