Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1994-01-25
1995-08-08
Hellner, Mark
Optical: systems and elements
Optical amplifier
Optical fiber
H01S 330
Patent
active
054404207
ABSTRACT:
Herein disclosed is an optical amplifier which permits sufficient reduction of light-transmission loss when it is incorporated into an optical communication system as a part thereof. The optical amplifier comprises an optical fiber 8 for amplification having a length sufficient for stimulated emission through excitation by an excitation laser beam and sufficient for amplifying a transmitted laser beam; an optical fiber 17 for transmission; and an optical wavelength division multiplexer 6 formed by partially fusing, under drawing conditions, the optical fibers 8 and 17 at a portion in the proximity to the light-incident end of the fiber 8 for amplification. The optical amplifier comprises the optical wavelength division multiplexer 6 formed from a part of the optical fiber 8 for amplification and, therefore, permits substantial reduction in the number of fused portions required for the connection thereof to an optical communication system upon incorporation thereof into the system. For this reason, the connection loss of light can substantially be reduced and accordingly the overall efficiency for amplification is substantially increased.
REFERENCES:
patent: 4442122 (1991-02-01), Ragit
patent: 4801185 (1989-01-01), Bricheno
patent: 4923268 (1990-05-01), Xu
patent: 5171345 (1992-12-01), Takemura
patent: 5280383 (1994-01-01), Federici et al.
patent: 5309536 (1994-05-01), Saganuma et al.
Koya Kazuo
Mori Tsuneo
Hellner Mark
Shin-Etsu Chemical Co. , Ltd.
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