Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1993-03-18
1995-06-06
Moskowitz, Nelson
Optical: systems and elements
Optical amplifier
Optical fiber
359174, 359337, H04B 1000, G02B 626
Patent
active
054227542
ABSTRACT:
An optical transmission line relayed with multistage optical amplifiers wherein the plurality of optical amplifiers inserted in the optical transmission line include at least two types mixed together: first optical amplifiers including broad band optical filters and second optical amplifiers including narrow band optical filters, whereby the amount of amplified spontaneous emission (ASE) from the optical amplifiers is reduced overall without applying any major frequency band limitation to the signal light spectrum.
REFERENCES:
patent: 4720160 (1988-01-01), Hicks
patent: 5115338 (1992-05-01), DiGiovanni et al.
patent: 5117303 (1992-05-01), Desurvire et al.
patent: 5140656 (1992-08-01), Hasegawa et al.
patent: 5260823 (1993-11-01), Payne et al.
Saito et al., "2.5 Gbit/s, 80-100 km Spaced In-Line Amplifier Transmission Experiments over 2.500-4.500 km," 17th European Conference on Optical Communication ECOC '91, 3 Post-Deadline Papers, Sep. 12, 1991, Paris, France, pp. 68-71.
S. Shimada, IEEE Trans. on Parallel and Distributed Systems, May 1, 1990, #2, p. 75.
Murakami et al, IEEE Photonics Tech. Lett, vol. 4, #11, pp. 1269-1272, Nov. 1992. Abst. only provided herewith.
Fujitsu Limited
Moskowitz Nelson
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