Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1996-02-12
1997-02-18
Moskowitz, Nelson
Optical: systems and elements
Optical amplifier
Optical fiber
359124, 359337, 359349, H01S 300, H04B 1000
Patent
active
056046278
ABSTRACT:
The optical amplifier device for an optical transmission system with bidirectional wavelength multiplex to a light transmission wave guide includes a first optical amplifier (OV1) for amplifying signals of a first wavelength (.lambda..sub.1) in a first direction; a second optical amplifier (OV2) for amplifying signals of a second wavelength (.lambda..sub.2) in a second direction; a first wavelength selective coupler (WDM1) connecting the input of the first optical amplifier (OV1) and the output of the second optical amplifier (OV2) with a light transmission wave guide (U) and a second wavelength selective coupler (WDM2) connecting the input of the second optical amplifier (OV2) and the output of the first optical amplifier (OV1) with the light transmission wave guide (U). Because of reflections noise amplification due to resonance would be considerable but according to the invention the noise resonances are prevented since the wavelength selective couplers (WDM1, WDM2) have a signal attenuation of 3 dB at different wavelengths.
REFERENCES:
patent: 4606632 (1986-08-01), Hillerich
patent: 5361157 (1994-11-01), Ishikawa et al.
patent: 5500763 (1996-03-01), Ota
patent: 5539566 (1996-07-01), Terahara et al.
Trutschel et al, ECIO '95 Proc. 7th Europ. Conf. on Integ. Opt., p. 5 vol. 1, (603) pp. 173-176, Apr. 3, 1995; abst. only. herewith.
Pezeshki et al, IEEE Photonics Tech. Lett., vol. 6, #10, pp 1225-1227, Oct. 1994. abst. only herewith.
Moskowitz Nelson
Robert & Bosch GmbH
Striker Michael J.
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