Photonic time stretch and its application to analog-to-digitalconversion
Coppinger, F.
Bhushan, A.S.
Jalali, B.
Dept. of Electr. Eng., California Univ., Los Angeles, CA;
This paper appears in: Microwave Theory and Techniques, IEEE Transactions on
Publication Date: Jul 1999
Volume: 47,
Issue: 7, Part 2
On page(s): 1309-1314
ISSN: 0018-9480
References Cited: 15
CODEN: IETMAB
INSPEC Accession Number: 6327861
Digital Object Identifier: 10.1109/22.775471
Current Version Published: 2002-08-06
Abstract
We demonstrate a new concept for analog-to-digital (A/D)
conversion based on photonic time stretch. The analog electrical signal
is intensity modulated on a chirp optical waveform generated by
dispersing an ultrashort pulse. The modulated chirped waveform is
dispersed in an optical fiber, leading to the stretching of its
envelope. We have derived analytical expressions for the stretch factor
and the resolution of the system. An analog-to-digital converter (ADC)
consisting of the photonic time-stretch preprocessor and a 1-Gsample/s
electronic ADC is demonstrated. This technique is promising for A/D
conversion of ultrafast signals and, hence, for realization of the
digital receiver
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