Fiber optic network system with low crosstalk using code-divisio

Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via code word channels

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

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.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Fiber optic network system with low crosstalk using code-divisio does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Fiber optic network system with low crosstalk using code-divisio, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fiber optic network system with low crosstalk using code-divisio will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1755750

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.