United States Patent  [ii] Patent Number: 4,595,839
Braun et al.  Date of Patent: Jun. 17, 1986
 BIDIRECTIONAL OPTICAL ELECTRONIC CONVERTING CONNECTOR WITH INTEGRAL PREAMPLIFICATION
 Inventors: Steven W. Braun, Encinitas; Henri Hodara, Altadena, both of Calif.
 Assignee: Tetra-Tech, Inc., Pasadena, Calif.
 Appl. No.: 734,805
 Filed: May IS, 1985
Related U.S. Application Data
 Continuation of Ser. No. 431,574, Sep. 30, 1982.
 Int. CI/ G02B 6/42
 U.S. CI 250/551; 250/227;
455/612; 350/96.20; 350/96.23
 Field of Search 250/551, 227, 239;
350/96.15, 96.17, 96.18, 96.20, 96.23; 455/610,
 References Cited
U.S. PATENT DOCUMENTS
3,792,284 2/1974 Kaelin 250/551
3,878,397 4/1975 Robb et al 250/551
3,883,681 5/1975 Campbell 350/96.20 X
4,144,530 3/1979 Redfern 350/96.23 X
4,360,729 11/1982 Harvey et al 250/227
4,408,307 10/1983 Harris 455/601
FOREIGN PATENT DOCUMENTS
2479618 10/1981 France 455/613
Primary Examiner—Edward P. Westin
Attorney, Agent, or Firm—Peter I. Lippman
A pair of connectors that convert electrical signals into optical signals for transmission along an optic fiber, and that also convert optical signals received from an optic fiber into electrical signals, is combined with a twooptic-fiber cable to provide an interconnecting cable assembly that receives electrical signals from a sending apparatus at either end of the cable, and presents electrical signals to a receiving apparatus at the other end of the cable, although the intervening transmission is optical. One optic fiber optically links the electrical-to-optical converter (l'ght emitter) in one connector to the optical-to-electrical converter (light detector) in the second connector, while the other optic fiber optically links the emitter in the second connector to the detector in the first connector; thus the cable assembly is bidirectional and may be laid down and connected in either orientation with equivalent performance. Preamplification and buffering is provided within each connector, for the optical-to-electrical conversion. Simple, easy to use, but very accurate alignment devices for juxtaposing the optical fibers to the sources and detectors permit rapid but reliable replacement of the cable. Such cable assemblies are advantageous in collecting data for seismic geomapping for petroleum, particularly when electrical wires too are in the cable assembly.
13 Claims, 12 Drawing Figures