LOW COST OPTICAL FIBER RF SIGNAL DISTRIBUTION SYSTEM
 Inventors: Harold A. Zarem, Sherman Oaks;
Xian L. Yeh, Diamond Bar; Henry A.
Blauvelt, San Marino; Israel Ury, Los
Angeles, all of Calif.
 Assignee: Ortel Corporation, Alhambra, Calif.
 Appl. No.: 184,967
 Filed: Jan. 21,1994
 Int. CI.6 H04B 10/20; H04B 10/00
 U.S. CI 359/121; 359/145; 359/167;
359/173; 359/178; 379/56
 Field of Search 359/120-121,
359/145-146, 125, 157, 164, 173, 167, 178; 379/56, 59; 385/53, 39, 77
 References Cited
U.S. PATENT DOCUMENTS
5,251,053 10/1993 Heidemann 359/145
FOREIGN PATENT DOCUMENTS
0476569 3/1992 European Pat. Off. 359/167
2586305 2/1987 France .
61-134712 6/1986 Japan .
2184289 6/1987 United Kingdom.
Chu et al., "Fiber Optic Microcellular Radio" IEEE Transactions on Vehicular Technology, vol. 40, No. 3, Aug. 1991, pp. 599-606.
Illil [EEIIIEI HI Hill Hill HUE lllll lllll lllll IIEI1 Illli llllll III 11111 III!
US005457557A [ii] Patent Number: 5,457,557  Date of Patent: Oct. 10,1995
B. Hillerich, "Trade-Off Between Beam Truncation and Defocussing With Taper Lenses on Single-Mode Fibers," Optics Communications, vol. 28, No. 3, Oct. 1, 1988.
M. Shibutani et al., "Reflection Induced Degradations in Optical Fiber Feeder for Microcellular Mobile Radio Systems," IEICE Transactions on Electronics, vol. E76-C, No. 2, Feb. 1993.
Primary Examiner—Leo H. Boudreau
Assistant Examiner—Kinfe-Michael Negash
Attorney, Agent, or Firm—Christie, Parker & Hale
A fiber optic RF signal distribution system has a plurality of antenna stations, each station including an RF antenna. A central RF signal distribution hub receives and transmits signals external to the system. A pair of optical fibers connects each antenna station directly to the distribution hub with the connections being in a star configuration. A connectorized laser module permits direct coupling of a distributed feedback semiconductor laser to the end of each optical fiber without an intervening connector. The module accepts an APC connector with the angled end of its optical fiber in an aperture plane in a connector housing. A distributed feedback laser is mounted in the connector housing with a lens for illuminating the aperture plane and hence, the end of the fiber at an acute angle to the axis of the fiber. Furthermore, the illumination is defocused at the aperture plane for loose optical coupling to the fiber and minimized reflection to the DFB laser.