All-optical 3R regeneration based on the XPM effect of semiconductor optical amplifier

We propose a 40 Gb/s all optical 3R regeneration system. A high Finesse Fabry-Perot (F-P) filter (FSR = 40 GHz, finesse = 1012) and a gain-saturated SOA are used to extract 40 GHz clock. Before the clock extraction, 40 Gb/s RZ optical signals are converted into a stable wavelength after noninverted wavelength conversion based on the XPM of a single SOA. In the all optical decision, dual SOAs in series were used to lengthen active region of SOA. The 40 Gb/s degraded RZ signals are regenerated based of the XPM of dual SOAs in series, when a 0.26-nm OBPF is blue shifted with respect to the wavelength of extracted clock. The experimental results show better eye opening, the decreased timing jitter front 5 to 1.4 ps and the 15 dB improved optical signal to noise ratio (OSNR). (c) 2008 Wiley Periodicals, Inc.