Wavelength-shift-free regenerator for 10 Gb/s RZ system on satellite by two-stage offset filter using HNLF and SOA

Aiming at the characteristics of dynamic routing and limitation on power in satellite optical network, a wavelength-shift-free regenerative scheme based on two-stage offset filter is put forward. Making use of the property that the signs of chirp induced by self-phase modulation are opposite in semiconductor optical amplifier (SOA) and high nonlinear fiber (HNLF), the scheme imposes a red-shifted filter and a blue-shifted filter respectively on the signals after SOA and HNLF, which not only realizes a two-stage regeneration for signals, but also compensates the frequency offset and keeps the wavelength unchanging before and after the regenerator. The results show that the Q factor of signals can be improved 6 dB, and the timing jitter caused by one-stage offset filter can be suppressed effectively.