Optical coupler for optical direct amplifier

Details Optical coupler for optical direct amplifier Optical coupler for optical direct amplifier

1987-11-02

1989-02-21

Lee, John D.

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Wide area network

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350 9629, 370 1, G02B 628

Patent

active

048059773

ABSTRACT:
A high power pump light source for optical direct amplifier using the stimulated Raman effect is obtained by using a plurality of semiconductor lasers each of which provides low output power. More than two beams of the same wavelength generated by semiconductor lasers are combined (polarization multiplex) by using a polarization prism block, which provides sufficient high power pump light for the stimulated Raman effect amplifier. The output of said polarization prism block is wavelength division multiplexed with signal light to be amplified by using an interference filter block, the output of which is applied to a transmission optical fiber in which amplification of said signal light is effected.

REFERENCES:
patent: 4401364 (1983-08-01), Mochizuki
patent: 4560246 (1985-12-01), Cotter
patent: 4595284 (1986-06-01), Tatekura et al.
patent: 4616898 (1986-10-01), Hicks, Jr.
Ohashi et al., Raman Amplification Characteristics, Etc., No. 1113 of 1985 Gen. Mtg. in the Elec. and Comm. Inst. of Japan Aoki et al., Noise Characteristics of Fiber Raman, Etc., No. 1115 of 1985 Gen. Mtg. in the Elec. and Comm. Inst. of Japan.

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