gain modulation
1.Improved schemes are present for wavelength conversion based on cross phase modulation (XPM) and cross gain modulation (XGM) in SOA.
3.All Optical Wavelength Conversion at 2.5 Gbit/s, NRZ optical pulse based on Cross-gain Modulation in SOA
4.All-optical wavelength conversion (AOWC) is mainly implemented by using four nonlinear effects: cross gain modulation (XGM), cross phase modulation (XPM), four wave mixing (FWM), and difference frequency generation (DFG).
5.Thus the light in the loop is modulated due to the cross gain modulation (XGM) and the cross phase modulation (XPM). At the same time, the light in the loop also modulates the gain of SOA. To our knowledge, there are no reports about the theory of simulation for IMLL based on SOA at present.
6.The wavelength conversion experiment of non return to zero (NRZ) optical pulse of the 2 5GHz repetitive frequency and the 1.55μm center wavelength based on cross gain modulation of semiconductor optical amplifier is reported. The separation between the converted laser and the signal laser is 2.7nm.
7.The dynamic characteristics of a wavelength converter based on cross?gain modulation in semiconductor optical amplifiers is analyzed theoretically. For first time, the dynamic carrier recovery time is used to equivalent the high frequency saturation filtering effect of the signal channel during the calculation and it is proved by comparing the outputting waveform gotten through this way and the experiment results reported in other papers. Ways to reduce the influence of the chirping on the converted signal and ISI of the converted signal are discussed.
9.Simulation results showed that the adaptive OFDM scheme exhibited more than 7.5 dB SNR gain for a target BER of 10~-4 relative to non-adaptive Turbo coded modulation for the same throughput.
10.Eigen-beamforming(EBF)technique and trellis coded modulation(TCM)concatenated with space time block code(STBC)are used to achieve code gain and diversity gain.
