• Title : All-optical analog-to-digital conversion using split-and-delay technique
• Author : Yuji Miyoshi, Kensuke Ikeda, Hideaki Tobioka, Takashi Inoue, Shu Namiki, and Ken-ichi Kitayama
• Journal : IEEE/OSA J. Lightwave Technology, Vol. 25, No. 6, pp.1339 - 1347, 2007.
• Abstract : We propose a simplified configuration of all-optical analog-to-digital(A/D) conversion using nonlinear optical loop mirrors (NOLMs). While the converntional scheme of such a all-optical A/D conversion requires N encoders and N thresholders, for N-bit resolution only using a single encoder and thresholder, based on a aplit-and delay technique, in which the encoder and the thresholder operate more than N times as fast as the sampling speed. After discussing detailed design issues of the NOLM based encoder with a particular emphasis on the so-called counterpropagating effects, all-optical 3-bit A/D conversion at 10G samples/s is experimentally demonstrated using the proposed configulation.
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