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Proceedings Paper

Low-loss L-band microwave fiber optic link for control of a T/R module
Author(s): Stephen Wanuga; Edward I. Ackerman; Dumrong Kasemset; David W. Hogue; Stephen R. Chinn
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Paper Abstract

An experimental directly modulated fiber-optic link assembled and optimized for L-band operation with near-zero RF insertion loss is presented. This was achieved by optimizing the critical coupling of light from the laser diode to a single-mode fiber and by applying reactive matching circuits to the laser and detector in order to minimize RF reflection losses. Microwave performance measurements are made on the fiber-optic-fed T/R module, in terms of noise figure, intermodulation distortion, and dynamic range, and compared with the module performance without the fiber-optic link. It is shown that careful attention to optical coupling and to the reactive matching of the optical laser and detector transducers can lead to a link gain of -1.8 dB at 1.3 GHz and a 150 MHz bandwidth. The 66.5 dB/MHz exp 2/3 spurious-free dynamic range exhibited by the present link in conjunction with a T/R module demonstrated the feasibility of employing fiber optics in many antenna-remoting optically-controlled phase arrays and optical microwave interconnect applications.

Paper Details

Date Published: 1 February 1991
PDF: 10 pages
Proc. SPIE 1374, Integrated Optics and Optoelectronics II, (1 February 1991); doi: 10.1117/12.24960
Show Author Affiliations
Stephen Wanuga, General Electric Co. (United States)
Edward I. Ackerman, General Electric Co. (United States)
Dumrong Kasemset, General Electric Co. (United States)
David W. Hogue, General Electric Co. (United States)
Stephen R. Chinn, General Electric Co. (United States)

Published in SPIE Proceedings Vol. 1374:
Integrated Optics and Optoelectronics II
Ka Kha Wong, Editor(s)

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