Wide-band electrooptic intensity modulator frequency response measurement using an optical heterodyne down-conversion technique

TitleWide-band electrooptic intensity modulator frequency response measurement using an optical heterodyne down-conversion technique
Publication TypeJournal Article
Year of Publication2006
AuthorsLam, A. K. M., M. Fairburn, and N. A. F. Jaeger
JournalIEEE Transactions on Microwave Theory and Techniques
Volume54
Pagination240-246
Date PublishedJAN
Type of ArticleArticle
ISSN0018-9480
Keywordselectrooptic modulators, frequency response, harmonic rejection, optical communications, optical down-conversion, optical heterodyning
Abstract

This paper describes a novel system for measuring the frequency response of electrooptic intensity modulators at millimeter-wave frequencies. The system measures vertical bar S(21)vertical bar in decibels electrical. In it, the electrical input signal to the modulator is generated, by heterodyning two tunable lasers. The output of the modulator is then down-converted to a microwave frequency at which the output is easily measured. Measurements have been made up to 78 GHz using a 55-GHz photodiode as the mixer for the two lasers. In addition, our system tracks any frequency variations in the outputs of the lasers. Our system can also measure the linear response of the modulator if it is operated in nonlinear regions since it can reject higher order harmonies, due to nonlinearities, generated in the modulator.

URLhttp://dx.doi.org/10.1109/TMTT.2005.860303%7D
DOI10.1109/TMTT.2005.860303

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