Low-loss L-band microwave fiber optic link for control of a T/R module

Stephen Wanuga; Edward I. Ackerman; Dumrong Kasemset; David W. Hogue; Stephen R. Chinn

doi:10.1117/12.24960

1 February 1991 Low-loss L-band microwave fiber optic link for control of a T/R module

Stephen Wanuga, Edward I. Ackerman, Dumrong Kasemset, David W. Hogue, Stephen R. Chinn

Proceedings Volume 1374, Integrated Optics and Optoelectronics II; (1991) https://doi.org/10.1117/12.24960
Event: SPIE Microelectronic Interconnect and Integrated Processing Symposium, 1990, San Jose, United States

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.

Citation Download Citation

Stephen Wanuga, Edward I. Ackerman, Dumrong Kasemset, David W. Hogue, and Stephen R. Chinn "Low-loss L-band microwave fiber optic link for control of a T/R module", Proc. SPIE 1374, Integrated Optics and Optoelectronics II, (1 February 1991); https://doi.org/10.1117/12.24960

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