Papers by Keyword: Wavelength Conversion

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Authors: Li Li Wang, Xiang Yan Qiu, Qiu Ming Ma
Abstract: All-optical wavelength conversion using cross-phase modulation (XPM) in a HNLF is demonstrated in this paper. The broadened spectrum caused by XPM which is induced by the input Gaussian pulses is given. The output BER of wavelength conversion is investigated.
Authors: Hai Dong Wu, Jin Song Guo, Yun Wen Wu, Zhao Xia Wang
Abstract: Bandwidth enhancement and response flattening of wavelength conversion based on single-pass and double-pass cascaded second harmonic generation and difference frequency generation in step-segmented quasi-phase matched (QPM) gratings are investigated. For the same waveguide length, high conversion efficiency, flat response and broad signal bandwidth can be obtained simultaneously by optimizing the poling period of the step-segmented QPM structure. The conversion bandwidths in a 3-cm-long five-step-segmented waveguide are 134 nm for single-pass scheme and 132 nm for the double-pass one, respectively, which are both over the whole conventional band and long-wavelength band. The ripple on the matching response can keeps less than 0.2 dB as well.
Authors: Jin Song Guo, Zhao Xia Wang, Hai Dong Wu, Yun Wen Wu
Abstract: Step-chirped gratings is utilized to broaden the bandwidth of wavelength conversion based on single-pass/ double-pass cascaded second harmonic generation and difference frequency generation. By adding the step-chirped gratings number and optimizing the poling period, broad conversion bandwidth and flat response can be obtained simultaneously. The bandwidth of 4-cm-long waveguide with 6-section chirped gratings are 169 nm for single-pass scheme and 164 nm for the double-pass one, which are 98 nm and 101 nm larger than those of uniform gratings, respectively. Furthermore, comparison between step-chirped gratings and equal-segmented gratings is carried out.
Authors: Jin Song Guo, Hai Dong Wu, Yun Wen Wu, Zhao Xia Wang
Abstract: We report difference frequency generation-based wavelength conversion in step-segmented quasi-phase matched (QPM) gratings. It is shown that both the pump bandwidth and the signal bandwidth are efficiently widened by adding the segment number of QPM grating and optimizing the poling period of the first segment and the period shifts between adjacent sections. Especially, flattop conversion efficiency response with peak-to-peak ripples less than 0.2 dB, which is very helpful to multichannel conversion in WDM systems, can be achieved simultaneously. For 3-cm-long waveguide, the signal conversion bandwidth and the pump bandwidth reach 166 nm and 0.88nm, respectively, meanwhile the maximum efficiency is-0.55dB.
Authors: Ning Zhang
Abstract: In this paper, we analyze the optical network with wavelength conversion, and discuss the architecture of network with wavelength converter in its node. The optical cross connects technology for wavelength division multiplexing (WDM) is rapidly developing. Wavelength conversion is one of the key techniques for switch WDM optical networks. The wavelength conversion technology can achieve wavelength reuse, decrease wavelength competition, enhance network flexibility and scalability, and simplify network structure and management. The results show that If these cross-connectors feature integrated with wavelength conversion, network will be better able to play the full potential of WDM optical networks.
Authors: Li Li Wang, Xiang Yan Qiu
Abstract: A new theoretical model for wavelength conversion based on XGM in fiber grating external cavity lasers is presented. The expression of mutual coupling parameter βm which indicates the efficiency of the wavelength conversion.was introduced in the model and and confirmed by numerical simulation. The theoretical analysis showed that the mutual coupling parameter βm is decided by intensity and frequency interval of CW light and the IM light, and the simulation results showed that the larger βm was, the better wavelength conversion was.
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