Optical communication system with monitoring device for avoiding

Details Optical communication system with monitoring device for avoiding Optical communication system with monitoring device for avoiding

1993-05-06

1995-12-12

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359174, 359179, 359110, H04B 1017

Patent

active

054755212

ABSTRACT:
If, in optical communication systems using fiber-optic amplifiers, the optical isolator at the input is omitted on cost grounds and because of the deterioration of the noise characteristics caused by the insertion loss, a giant pulse may be developed when a fiber-optic connector at the input is being separated. To avoid this occurrence, use is made of a monitoring device (7) which, when the power input to the fiber-optic amplifier (4, 5, 3, 6) drops below a given threshold, quickly turns off the current of the pump laser (4) or interrupts the light path of the pump laser (4).

REFERENCES:
patent: 3887876 (1975-06-01), Zeidler
patent: 5054876 (1991-10-01), Grasso
patent: 5260819 (1993-11-01), Hadjifotiou et al.
patent: 5268786 (1993-12-01), Matsushita
patent: 5355250 (1994-10-01), Grasso et al.
"10 Gbit/s to 260000 Subscribers Using Optical Amplifier Distrubution Network" by B. Wedding -ICC/Supercom '92, Optical Communications 300 Level Session, Impact of Optical Amplifiers on Network Hachitecture.
"Laser Diode Modulation and Noise", Kluwer Academic Publishers, Ut K Scientific Publisher, Tokyo 1988 by U. Petermann, pp. 145-147.
Siemens Telcom report 6, Apr. 1983, supplement "Nachrichtenubertragung mit Licht", pp. 205-208 with translation of Abstract.
Patent Abstracts of Japan, vol. 6, No. 47 (E-99) (925) 26. Marz 1982 & JP-A-56 162 554 (Nippon Denshin Denwa Kosha).
Patent Abstracts of Japan, vol. 15, No. 334 (E 1104) 26. Aug. 1991 & JP A 31 27 887 (Mitsubishi Cable Ind).

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