Optical Encoding and Decoding of Femtosecond Pulses in the Spectral Domain Using Optical Coupler with Fiber Gratings(Special Issue on Ultrafast Optical Signal Processing and Its Application)

概要

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We have developed optical encoding devices for processing femtosecond pulses. These devices are based on spectral separation devices and light modolators with fiber gratings. Experiments were made to encode a light poise-in the spectral domain. These experiments utilize the characteristics that a femtosecond light pulse has a very broad spectrum. An input femtosecond light pulse is decomposed into a series of wavelength components. Each wavelength component with narrow spectra<1nm width is successfully extracted into a single mode fiber. Light modulators corresponding to wavelength components are assigned to the 1st bit, the 2nd bit, the 3rd bit, ・・・, the nth bit, respectively. All of the encoded wavelength components are again recombined into a single time-varying signal and transmitted through an optical fiber. Decoding at receiving site is made by the reverse operation. Encoding and decoding for 2-bit and 4-bit signals were demonstrated for 200fs input light pulse with about 40nm spectral width.
社団法人電子情報通信学会の論文
2002-01-01