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Proceedings Paper

Reference-comb generation technique for multichannel down-conversion
Author(s): Todd R. Bader
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Paper Abstract

Various forms of coherent optical signal processors require an input reference signal that is composed of a comb of frequencies equally spaced over a wide operating bandwidth. The principle function of this waveform is to provide an array of local oscillators to simultaneously downconvert an array of contiguous subbands over a wide bandwidth to a common IF or baseband. An additional requirement of this reference signal for optical processors is that the power be uniformly distributed in time to maximize dynamic range. A periodic chirp is an example of an efficient reference waveform. This paper presents an analog RF feedback technique that requires only two CW inputs to generate a uniform comb of reference frequencies such that the time waveform is a periodic chirp. An analysis is presented that defines the relationship between the generator design and output signal parameters, and discusses factors that impact signal quality and stability. A simulation is used to illustrate the behavior of the generator. An acousto-optic implementation is also discussed, and an example of an architecture that incorporates the signal generator within a coherent optical Fourier analyzer is described. The results of an experimental demonstration of a feedback chirp generator are reported.

Paper Details

Date Published: 2 December 1992
PDF: 12 pages
Proc. SPIE 1703, Optical Technology for Microwave Applications VI and Optoelectronic Signal Processing for Phased-Array Antennas III, (2 December 1992); doi: 10.1117/12.138371
Show Author Affiliations
Todd R. Bader, ESL, Inc. (United States)


Published in SPIE Proceedings Vol. 1703:
Optical Technology for Microwave Applications VI and Optoelectronic Signal Processing for Phased-Array Antennas III
Shi-Kay Yao; Brian M. Hendrickson, Editor(s)

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