Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1990-06-22
1995-09-05
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
256 731, 25022714, H01J 516
Patent
active
054480590
ABSTRACT:
Apparatus and a method for increasing the optical measurement range in optical time domain reflectometers in which a fibre laser amplifier is used to amplify the optical time domain reflectometer pulses launched into a waveguide. This apparatus and method have particular usefulness for branched local networks. The signal returning to the optical time domain reflectometer is amplified as well as the outbound signal.
REFERENCES:
patent: 5013907 (1991-05-01), Bateman
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An Optical Time-Domain Reflectometer for Long 1.5-.mu.m Band Optical Fiber Cables, K. Noguchi et al., Review of the Electrical Communications Lab., vol. 35, No. 5 1987 pp. 541-545.
1.5-.mu.m Band Optical Time Domain Reflectometer for Single-Mode Optical Fiber Using a P.sub.2 O.sub.5 -Highly-Doped Fiber Raman Laser, K. Suzuki et al., Journal of Lightwave Technology, vol. 6, No. 1, Jan. 1988. pp. 94-99.
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250 km Nonrepeated transmission experiment at 1.8 Gb/s Using LD pumped Er.sup.3+ -doped Fibre Amplifiers in IM/direct Detection System, K. Hagimoto et al., Electronics Letters, May 11, 1989, vol. 25, No. 10, pp. 662-664.
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Suzuki et al, "Long-Range OTDR For Single-Mode Optical Fiber Using A P.sub.2 O.sub.5 Highly Doped Fibre Raman Laser", Electronics Letters, 20 Nov. 1986, vol. 22, No. 24, pp. 1273-1274.
Noguchi et al, "An Optical Time-Domain Reflectometer for Long 1.5-.mu.m Band Optical Fiber Cables", Review of the Electrical Communications Laboratories, vol. 35, No. 5, 1987, pp. 541-545.
Suzuki et al, "1.5 .mu.m-Band Optical Time Domain Reflectometer for Single-Mode Optical Fiber Using a P.sub.2 O.sub.5 -Highly-Doped Fiber Raman Laser", Journalof Lightwave Technology, vol. 6, No. 1, Jan. 1988, pp. 94-99.
Spirit et al, "Raman-Assisted Long-Distance Optical Time Domain Reflectometry", Elec. Ltrs. vol. 25, No. 25, 7 Dec. 1989, pp. 1687-1688.
Blank et al, "OTDR Performance Enhancement Through Erbium Fibre Amplification", Elec. Ltrs. vol. 25, No. 25, 7 Dec. 1989, pp. 1693-1694.
Tamura et al, "Fiber Raman Amplifier Module with Semiconductor Laser Pump Source", ECOC 87 Technical Digest, vol. 1, pp. 62-65.
Blank Lutz C.
Spirit David M.
British Telecommunications public limited company
Lee John R.
Westin Edward P.
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