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10 June 1994 High-resolution spectra of cross phase modulation for an A/D converter
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The spectral sub-structures of XPM were measured using a high resolution optical spectral analysis system. The observation is in good agreement with the theoretical prediction. The oscillatory behavior of the XPM spectrum is suggested to be used for a high-bit all-optical XPM A/D converter. With the advent of ultrashort laser sources, it has been established that a light pulse can be used to control the properties of its own or another light pulse by using optical nonlinear processes in a material. This important property can be utilized for the future generation of high-speed optical computations and communications. Over the past several years, the operation of ultrafast optical logic gated using picosecond Sagnac Kerr Interferometer switch and phase conjugation gates have been successfully demonstrated. The third order nonlinear process cross-phase-modulation (XPM), in which the phase of a weak signal pulse is modulated by the index change induced by a strong pump pulse to produce the spectral broadening, provides a novel method to modulated the frequency of optical pulses at THz speed. We propose the ultrafast all optical A/D converter using XPM and report on measurements on the fine spectral structures of the XPM spectra of picosecond laser pulses using high resolution grating spectral analysis system. The observed substructure of the oscillatory XPM spectrum is suggested to be used for increasing the accuracy of all optical XPM A/D converters.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Peng Pei Ho, Quan-Zhen Wang, Q. D. Liu, Daniel Liu, and Robert R. Alfano "High-resolution spectra of cross phase modulation for an A/D converter", Proc. SPIE 2155, Optoelectronic Signal Processing for Phased-Array Antennas IV, (10 June 1994);

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