Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via code word channels
Patent
1993-01-28
1997-01-07
Gregory, Bernarr E.
Multiplex communications
Communication techniques for information carried in plural...
Combining or distributing information via code word channels
359135, 359140, 380 34, 375200, H04J 1302
Patent
active
H00016268
ABSTRACT:
A code-division multiplexed system comprising an optical source, a code generator for developing and applying a pseudo-random bit sequence code to the optical source to cause the optical source to develop a unipolar coded optical signal, a means for dividing the unipolar coded optical signal into N optical paths separated from each other by associated successive integer multiples of a bit period T of delay, N information signal sources responsive to the unipolar coded optical signals for selectively producing N differently-delayed optical information signals, a means for combining the N differently-delayed optical information signals into an output optical signal comprised of an intensity sum of the overlapping N differently-delayed optical unipolar information signals, a photodetector responsive to the output optical signal for developing an input electrical signal corresponding to the sum of N overlapping unipolar optical signals, an adjustable delay circuit responsive to the pseudo-random bit sequence code for producing a desired bipolar reference code corresponding to the delay associated with an associated desired one of the N differently-delayed optical information signals, and a correlation circuit responsive to the input electrical signal and to the desired bipolar reference code for synchronously correlating the desired bipolar reference code with the input electrical signal to extract a desired electrical signal corresponding to the desired one of the N differently-delayed optical information signals and to substantially suppress any other electrical signal that is asynchronously aligned with the desired bipolar reference code.
REFERENCES:
patent: 4964138 (1990-10-01), Nease et al.
patent: 5022047 (1991-06-01), Dixon et al.
patent: 5081643 (1992-01-01), Schilling
patent: 5144640 (1992-09-01), Yamamoto
patent: 5216693 (1993-06-01), Nakamura
Sakai et al., "Multiplexing of Optical Fiber Sensors Using a Frequency-Modulated Source and Gated Output", Journal of Light Wave Tech., vol. LT-5, No. 7, Jul. 1987, pp. 932-940.
Al-Raweshidy et al., "Hybrid Optical Spectral and time division multiplexing for passive interferometric fibre optic sensors network," Optics communication, vol. 95 No. 4-6, pp. 239-245, 15 Jan. 1993.
Holmes et al., "Multiplexing Optical Sensors using a spatial light modulator," Proceedings of the SPIE-vol. 1797, 1993, pp. 210-217.
Prucnal et al., "Spread Spectrum Fiber-Optic Local Area Network Using Optical Processing", Journal of Lightwave Tech., vol. LT-4, No. 5, May 1986, pp. 547-554.
Everard, "Novel Signal Processing Techniques For Enhanced OTDR Sensors" SPIE, vol. 798, FiberOptic Sensors II, 31 Mar.-3 Apr. 1987, pp. 42-46.
Al-Raweshidy et al., "Spread Spectrum Technique For Passive Multiplexing of Interferometric Optical Fibre Sensors", SPIE, vol. 1314, Fibre Optics '90, 24-26 Apr. 1990, pp. 342-347.
Kersey et al., "Phase-Noise Reduction in Coherence-Multiplexed Interferometric Fibre Sensors", Electronics Letters, vol. 22, No. 11, 22 May 1986, pp. 616-618.
Kersey et al., "Multiplexed Mach-Zehnder Ladder Array With Ten Sensor Elements", Electronics Letters, vol. 25, No. 19, 14 Sep. 1989, pp. 1298-1299.
Dandridge Anthony
Kersey Alan D.
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