Optical communication system with a fiber optic amplifier

Details Optical communication system with a fiber optic amplifier Optical communication system with a fiber optic amplifier

1991-11-14

1994-02-08

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359114, 359173, H04B 1012

Patent

active

052853063

ABSTRACT:
In an optical communication system with a fiber-optic amplifier which includes a wavelength-selective fiber-optic coupler for coupling pump light into the amplifying length of fiber, an additional optical signal, e.g., a service-channel signal, is transmitted from the location of the fiber-optic amplifier in one direction or the other by being used to modulate the pump light. Since the pump light is not completely absorbed in the amplifying length of fiber, a sufficient portion is transferred from the length of fiber into the optical waveguide of the optical communication system and passes down the optical waveguide to the end point of the communication system. There, it is coupled out and passed to an optical receiver from whose output the transmitted additional signal is recovered by demodulation. To prevent the modulation of the pump light from modulating the amplification brought about by the amplifying length of fiber, the additional signal is modulated onto a carrier wave of sufficiently high frequency, and the resulting signal is used to modulate the pump light.

REFERENCES:
patent: 5035481 (1991-06-01), Mollenauer
patent: 5121241 (1992-06-01), Veith
patent: 5140656 (1992-08-01), Hasegawa
patent: 5153762 (1992-10-01), Huber
"5 Gbit/s Transmission over 146 Km Using Erbium-Doped Fibre Amplifier", B. Wedding et al, Proceedings of the 15th European Conference on Optical Communication (ECOC 89), Gothenburg, Sweden, Sep. 10-14, 1989, vol. 1, pp. 86-89.
Patent Abstracts of Japan, vol. 10, No. 247 (P-490)(2303) Aug. 26, 1986 & JP-A-61075 326 (NEC) Apr. 17, 1986.

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