The Study Of All-optical Wavelength Converter Based On XGM, XPM In A Semiconductor Optical Amplifier

All-optical wavelength converter(WC) is the importent technology to realyse wavelength-route in high speed and big capacity optical fiber system, it can overcome the electric bottleneck of“electic-optic-electric”wavelength conventer, improve switching node contention problems caused by network congestion to achieve wavelength reuse. In the meantime, all-optical wavelength converter is the key research in the wavelength-decision multiplexing of all-optic 3R regeneration. Semiconductor optical amplifier (SOA) has very strong nonlinear characteristic, so it become a hot optical component in all-optical wavelength converter. Using SOA to realize all-optical wavelength converter has high conversion efficiency and low power consumption, etc. In all-optical wavelength converter basing SOA, there are cross-gain modulation (XGM), cross-phase modulation (XPM) and four-wave mixing (FWM). Our reaearch bases on the three aspects.The novel’s main contents are as follows:(1)Theory analysis. Firstly, we analysis the basic theoretical characteristics of SOA and nonlinear characteristic. Secondly, we analysis the relationship of signal to noise ratio (SNR), extinction ratio and extinction ratio (BER) of XGM, we do the theoretical modeling. Thirdly, we analysis the theory of XPM and introduce the structure of TOAD. Finally, we analysis the theory of FWM and bring through the relationship with SOA current, the Differences of wavelength between two optics, optical power and polarization state.(2)Simulation analysis. In this chapter, we has done much simulation Study using Optisystem. First, we simulate the transfer process of Gaussian pulse and pulse sequence in SOA, and analysis BERT effect. Secondly, we simulate the converting process of XGM, we change the experimential condition to observe the result. For the converting process of FWM, we change the experimential condition of SOA current, the Differences of wavelength between two optics, optical power and polarization state observe the result.(3)Experimental study. For XGM wavelength converter, we carry out the experiments of 40Gbit/s: Firstly, we respectively do the wavelength converter of wideband filter and narrow filter, get the theorical result that narrow filter can restrant BERT effect; Secondly, we change the power of control pulse, the power of continue wave and SOA current to observe the result of experiment. For TOAD based XPM, we change the asymmetric offset△x, the polarization of two wave, the power of continue wave and SOA current to observe the result of experiment.