摘要We investigate the phase-preserving amplitude regenerative characteristics of the return-to-zero (RZ) differential-phase-shift-keying (DPSK) wavelength conversion based on four-wave mixing (FWM) in a semiconductor optical amplifier (SOA). The Q-factor and the optical signal-to-noise ratio (OSNR) before and after conversion are experimentally obtained and analysed in different input noise power levels. In both the continuous-wave and synchronous clock pumping cases, we find that there is amplitude clamping in the FWM conversion due to the gain saturation of SOA, which can suppress the amplitude fluctuation of the converted DPSK signal before and after demodulation. We have achieved 2-dB Q penalty improvement in our experiment demonstration of 10Gbit/s RZ-DPSK signal with OSNR lower than 19dB.
Abstract：We investigate the phase-preserving amplitude regenerative characteristics of the return-to-zero (RZ) differential-phase-shift-keying (DPSK) wavelength conversion based on four-wave mixing (FWM) in a semiconductor optical amplifier (SOA). The Q-factor and the optical signal-to-noise ratio (OSNR) before and after conversion are experimentally obtained and analysed in different input noise power levels. In both the continuous-wave and synchronous clock pumping cases, we find that there is amplitude clamping in the FWM conversion due to the gain saturation of SOA, which can suppress the amplitude fluctuation of the converted DPSK signal before and after demodulation. We have achieved 2-dB Q penalty improvement in our experiment demonstration of 10Gbit/s RZ-DPSK signal with OSNR lower than 19dB.
[1]Olsson N A 1992 IEEE Proc. 80 375 [2] Chen G X et al 2005 Chin. Phys. Lett. 22 110 [3] Chi N et al 2001 IEEE Photon. Technol. Lett. 13 499 [4] Zhang J Y et al 2005 LEOS paper ME2 [5] Dong Y et al 2003 LEOS 1 403 [6] Wolfson D OFC/NFOEC 1999 paper PD36 [7] Simos H et al 2004 J. Lightwave Technol. 22595 [8] Gnauck A H et al. 2003 IEEE Photon. Technol. Lett. 15 467 [9] Dong Y et al 2004 OFC/NFOEC 54 [10] Croussore K and Li G F 2007 Electron. Lett. 43 177 [11] Grigoryan V S et al 2005 Electron. Lett. 411021 [12] Kang I et al 2005 ECOC paper Th 4.3.3 [13] Matsumoto M. 2005 J. Lightwave Technol. 232696 [14] Croussore K et al 2004 Opt. Lett. 29 2357 [15] Gordon J P and Mollenauer L F 1990 Opt. Lett. 15 1990 [16] Wen H et al 2007 OFC paper JThA35
2008, Vol. 25 
