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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,光电子材料导论信息处理技术和材料全光波长转换优秀课件,*,All-optical wavelength conversion,To “imprint” digital information from one wavelength of to another wavelength without passing the signal through electronics,Critical next step in the evolution of optical networks and photonic packet switching.,光电子材料导论信息处理技术和材料全光波长转换优秀课件,Worlds first widely-tunable all-optical wavelength converter, designed and fabricated at UCSB,光电子材料导论信息处理技术和材料全光波长转换优秀课件,The most important use will be for avoidance of wavelength blocking in optical cross connects in WDM networks.,Increase the flexibility and the capacity of the network for a fixed set of wavelengths,.,光电子材料导论信息处理技术和材料全光波长转换优秀课件,Wavelength conversion is a very useful function in advanced optical systems.,The converters should feature the followings:,Bit-rate transparency (up to at least 10,Gb/s,).,No extinction ratio degradation.,high signal-to-noise ratio at the output (to ensure,cascad,-ability),Moderate input power levels(0,dBm,).,光电子材料导论信息处理技术和材料全光波长转换优秀课件,Large wavelength span for both input and output signals.,Possibility for same input and output wavelengths (no conversion).,Low chirp,Fast setup time of output wavelength,Insensitivity to input signal polarization,Simple implementation,光电子材料导论信息处理技术和材料全光波长转换优秀课件,Wavelength conversion technologies,Electro-optic converter consisting of a detector followed by a laser that retransmits the incoming signal on the new wavelength.,Complexity,Large power consumption,Speed limitation,光电子材料导论信息处理技术和材料全光波长转换优秀课件,All-optical wavelength converters:,Semiconductor optical amplifiers(SOA) in cross gain modulation (XGM),Cross phase modulation (XPM), Four wave mixing (FWM), bistable lasers,Incorporating saturable absorbers, injection locked Y-lasers; FWM in optical fiber.,光电子材料导论信息处理技术和材料全光波长转换优秀课件,XGM in SOA,光电子材料导论信息处理技术和材料全光波长转换优秀课件,Principle,Use SOA gain saturation characteristic,.,A cw signal at the desired output wavelength is modulated by the gain variation, so after the SOA it carries the same information as the intensity modulated input signal.,The XGM SOA wavelength converter is polarization independent,.,光电子材料导论信息处理技术和材料全光波长转换优秀课件,Long SOA has superior dynamic performance,Long SOA only has 30 nm bandwidth, whereas it is 60 nm for short SOA.,Smaller bandwidth gives larger differential gain at the short wavelength side of the gain peak, a larger extinction ratio of the converted signal is expected for the long SOA,光电子材料导论信息处理技术和材料全光波长转换优秀课件,光电子材料导论信息处理技术和材料全光波长转换优秀课件,光电子材料导论信息处理技术和材料全光波长转换优秀课件,Extinction Ratio of XGM-converted Signals,光电子材料导论信息处理技术和材料全光波长转换优秀课件,光电子材料导论信息处理技术和材料全光波长转换优秀课件,XPM SOA Converters,光电子材料导论信息处理技术和材料全光波长转换优秀课件,光电子材料导论信息处理技术和材料全光波长转换优秀课件,XPM,光电子材料导论信息处理技术和材料全光波长转换优秀课件,光电子材料导论信息处理技术和材料全光波长转换优秀课件,Schematic of monolithic integrated asymmetric MZI-SOA wavelength converter,光电子材料导论信息处理技术和材料全光波长转换优秀课件,四波混频全光波长转换,光电子材料导论信息处理技术和材料全光波长转换优秀课件,Energy-level diagram for dual-wavelength-pumped Raman-resonant FWM process. Conversion of the weak primary pump wave P1 to the corresponding first Stokes wave S1(P1) is achieved by strong phonon prepared by the intense secondary pump wave P2 and the corresponding first Stokes wave S1(P2).,Schematic diagram of dual-wavelength-pumped fiber Raman converter.The P1 wave is incident on the converter fiber, and the P2 and S1(P2) waves are also incident on the converter fiber from fiber couplers. Then, FWM occurs in the converter due to Raman polarization and generates a S1(P1) wave while maintaining the original information in the P1 wave. The wavelength of the converted S1(P1) wave is varied by adjusting the S1(P2) wavelength.,光电子材料导论信息处理技术和材料全光波长转换优秀课件,
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