Optimization of 1.5 μm-Band LiNbO_3 Quasiphase Matched Wavelength Converters for Optical Communication Systems(Special Issue on Advanced Optical Devices for Next Generation Photonic Networks)

概要

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1.5 μm-band LiNbO_3 quasiphase matched(QPM) wavelength converters consisting of a periodical domain inverted structure and a proton exchanged waveguide, have been studied in detail both theoretically and experimentally. Optimum device fabrication conditions are investigated with respected to waveguide propagation loss, coupling loss to a single-mode fiber and wavelength conversion efficiency. A normalized conversion efficiency as high as 200 %/W(by a SHG measurement)and a fiber-to-fiber insertion loss of less than 3.5 dB(@1.55μm)is obtained for a wavelength converter module with a device length of 40 nm. It is shown that a highly uniform periodical domain inverted structure and a uniform proton exchange waveguide are key to obtaining efficient wavelength conversion. The tolerance of the waveguide width fluctuation is found to be very critical and is less than 20 nm for a 40 nm-long device. Future optimization of LiNbO_3 QPM wavelength converters and the possible device applications in future optical communication systems are also presented.
社団法人電子情報通信学会の論文
2000-06-25