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Proceedings Paper

Dual function electroabsorption waveguide modulator/detector for photonic rf signal processing
Author(s): Robert B. Welstand; Stephen A. Pappert; Chen Kuo Sun; Hao Jiang; Guoliang Li; Wei-Xi Chen; J. T. Zhu; Yet Zen Liu; Paul K. L. Yu
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Paper Abstract

A Franz-Keldysh effect InGaAsP electroabsorption waveguide device is utilized as the high-frequency, high-linear dynamic range modulator and photodetector. The dual-function modulator/photodetector can be useful in compact transmit/receive front end antenna architectures. Adjusting the electrical bias to the reverse-biased p-i-n diode, either efficient optical modulation or detection is demonstrated. As an electroabsorption modulator, a fiber optic link with a minus 17.4 dB rf loss and a 124 dB-Hz4/5 sub-octave spurious-free dynamic range is obtained with electrical biases in the 2 to 3 V range. As a waveguide photodetector, a 0.47 A/W fiber coupled responsivity, photocurrents up to 20 mA, and an output second-order intercept of plus 34.5 dBm are achieved at 7 V electrical bias. Supporting measurements on additional test devices show a trend toward larger intercept point with longer device lengths.

Paper Details

Date Published: 1 July 1997
PDF: 7 pages
Proc. SPIE 3075, Photonic Processing Technology and Applications, (1 July 1997); doi: 10.1117/12.277627
Show Author Affiliations
Robert B. Welstand, Univ. of California/San Diego (United States)
Stephen A. Pappert, Naval Command, Control and Ocean Surveillance Ctr. (United States)
Chen Kuo Sun, Naval Command, Control and Ocean Surveillance Ctr. (United States)
Hao Jiang, Univ. of California/San Diego (United States)
Guoliang Li, Univ. of California/San Diego (United States)
Wei-Xi Chen, Univ. of California/San Diego (United States)
J. T. Zhu, Univ. of California/San Diego (United States)
Yet Zen Liu, Fermionics Corp. (United States)
Paul K. L. Yu, Univ. of California/San Diego (United States)


Published in SPIE Proceedings Vol. 3075:
Photonic Processing Technology and Applications
Andrew R. Pirich; Raymond K. Boncek, Editor(s)

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