| In recent years,the further improvement of information transmission rate and optical fiber capacity has brought the prosperity of 4G,5G and Internet short video era.However,in the optical switching layer,the "opto-electric-optical" process of traditional optical network has seriously affected the development of optical network.In order to overcome the transmission rate bottleneck caused by "optical-electric-optical" conversion,the switching and transmission of future optical networks should be completely carried out in the optical domain,which makes the all-optical signal processing technology more and more important.All-optical signal processing technology includes all-optical wavelength conversion,all-optical code conversion,all-optical logic,all-optical cache,etc.Due to the great potential of semiconductor optical amplifier(SOA)in all-optical signal processing technology,a series of researches are carried out in this paper.The main contents are as follows:1.An experimental scheme of measuring SOA line-width enhancement factor based on spatial interferometer is proposed,and its measurement principle is deduced.The relationship between different SOA line-width enhancement factors and injected light power and driving current is measured with the experimental system built,and the specific value and variation trend of line-width enhancement factor are given.2.A differential balance signal generation scheme based on TOAD structure and 33 coupler is proposed and verified experimentally,and the effect of laser linewidth on signal generation scheme is studied.3.A cascade SOA structure controlled by differential balance signal is proposed,which can realize all-optical wavelength conversion and OOK-PSK code conversion using SOA-XPM effect.The principle is verified by experiments,and the waveform fluctuation caused by SOA cross gain modulation is eliminated while the all-optical phase modulation is realized,which improves the signal quality. |
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