Communications: directive radio wave systems and devices (e.g. – With particular circuit
Patent
1988-09-14
1989-12-05
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
With particular circuit
342368, G01S 1300, H01Q 334
Patent
active
048855898
ABSTRACT:
The invention relates to the distribution of radio frequency signals using optical fibers between a centrally located radar transmitter/receiver and remotely located transmit/receive modules associated with the elements of an active phased array. The invention avoids the need for remotely located lasers, by using the optical carrier generated at the central location for both transmission, when it is modulated by the transmitter and supplied to each T/R module over an optical path; and for reception, when it is supplied to each T/R module unmodulated. An optical switch and an optical modulator in the T/R module permit the antenna return to be converted to an optical format for supply over a second optical path to the central receiver. The arrangement may be further simplified by selecting a simple optical device to perform both the optical switching and optical modulation function in each T/R module.
REFERENCES:
patent: 4258363 (1981-03-01), Bodmer et al.
Crystal Technology, Inc., "OGW Traveling-Wave 2.times.2 Switch With and Without Fiber Optic Pigtails", pp. 2-4;
Crystal Technology, Inc., "OGW 2.times.2 Switch With and Without Fiber Optic Pigtails for High-Speec Switching of Light".
Journal of Electrical and Electronics Engineering, Australia--IE Aust. & IREE Aust., vol. 6, No. 4, "Integrated Electro-Optic Modulators and Switches", Dec. '86, P. S. Chung, pp. 308-320.
Journal of Lightwave Technology, vol. LT-5, No. 3, Mar. 1987, "System Characteristics of Direct Modulated and Externally Modulated RF Fiber-Optic Links", W. E. Stephens, T. R. Joseph, pp. 380-387.
GEC Journal of Research, vol. 2, No. 2, 1984, "Integrated Optical Components for Phased Arrays", N. J. Parsons, pp. 76-81.
SPIE vol. 477 Optical Technology for Microwave Applications (1984), "Transmitter and Receiver Design for Microwave Fiber Optic Links", H. Blauvelt and H. Yen, pp. 44-51.
Edward Brian J.
Wanuga Stephen
Barron Jr. Gilberto
Cahill Robert A.
General Electric Company
Jacob Fred
Lang Richard V.
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