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Proceedings Paper

Module to determine the optimum bias of a semiconductor EA modulator
Author(s): Jessica G. Huntington; William S. C. Chang; Paul K. L. Yu; Stephen A. Pappert; Chen Kuo Sun
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Paper Abstract

The best RF link gain and the multi-octave SFDR are obtained when the semiconductor EA modulator is biased at the point where the photocurrent has maximum slope efficiency. Since the maximum slope efficiency corresponds directly to the maximum slope of the photocurrent, the photocurrent output is monitored as the applied bias voltage is swept1. The voltage at which the modulator photocurrent changes fastest (highest slope) corresponds to the optimum bias point for maximum link gain. During the sweep, the photocurrent output from the modulator is amplified and sent to a microcontroller. The microcontroller records the photocurrent during the sweep and determines the optimum bias. This is preferable to the common way of determining maximum RF gain by tapping off a portion of the optical power because it does not induce optical loss or require additional optical components. This paper will present the design and testing of a module that will stand alone and apply the optimum dc bias for a modulator automatically.

Paper Details

Date Published: 7 September 2000
PDF: 5 pages
Proc. SPIE 4112, Radio Frequency Photonic Devices and Systems, (7 September 2000); doi: 10.1117/12.399390
Show Author Affiliations
Jessica G. Huntington, Univ. of California/San Diego (United States)
William S. C. Chang, Univ. of California/San Diego (United States)
Paul K. L. Yu, Univ. of California/San Diego (United States)
Stephen A. Pappert, Space and Naval Warfare Systems Ctr., San Diego (United States)
Chen Kuo Sun, Space and Naval Warfare Systems Ctr., San Diego (United States)


Published in SPIE Proceedings Vol. 4112:
Radio Frequency Photonic Devices and Systems
Andrew R. Pirich; Anastasios P. Goutzoulis; Paul L. Repak, Editor(s)

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