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Intermodulation distortion in high dynamic range microwave fiber-optic links with linearized modulators

Schaffner, James H. and Bridges, William B. (1993) Intermodulation distortion in high dynamic range microwave fiber-optic links with linearized modulators. Journal of Lightwave Technology, 11 (1). pp. 3-6. ISSN 0733-8724.

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Linearization of integrated optic intensity modulators significantly reduces the two-tone intermodulation distortion. The resulting intermodulation distortion produced by these modulators then varies as the input power to the fifth-order link system, the overall intermodulation product is a combination of third-order and higher-order terms. The authors determine the dynamic range of a cascaded microwave network consisting of a preamplifier, a high-dynamic-range fiber-optic link with a highly linear modulator, and a postamplifier. An expression is found that relates the intermodulation power at the output to the relative suppression from the signal level. As an example, a hypothetical 10-GHz low-distortion fiber-optic link that has a dynamic range of 125 dB in a bandwidth of 1 Hz is cascaded with various preamplifiers, and it is shown that the dynamic range of the system is reduced by as much as 20 dB, depending on the third-order intercept of the amplifier.

Item Type:Article
Additional Information:© Copyright 1993 IEEE. Reprinted with permission. Manuscript received September 17, 1991; revised April 20, 1992. The authors would like to thank Dr. G.L. Tangonan for the many helpful technical discussions.
Subject Keywords:intermodulation; optical links; optical modulation
Record Number:CaltechAUTHORS:SCHAjlt93
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10064
Deposited By: Archive Administrator
Deposited On:08 Apr 2008
Last Modified:26 Dec 2012 09:56

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