Optical amplifier and optical transmission system

Details Optical amplifier and optical transmission system Optical amplifier and optical transmission system

1996-12-19

1999-01-12

Ngo, Hung N.

Optical waveguides

With optical coupler

Plural

372 6, G02B 628

Patent

active

058599380

ABSTRACT:
An optical amplifier with redundant excitation light sources for exciting a rare earth doped optical fiber such as an EDF (Erbium Dope Fiber) minimizes the loss of the excitation light so as to introduce the excitation light to the EDF effectively, though an optical coupler, which plural optical fibers for transmitting the excitation lights from plural excitation light sources are welded, is used. And, the optical amplifier keeps the total of the excitation light introduced to the EDF at a predetermined value and changes one excitation light source to the other unless the output total from the respective excitation light sources becomes zero.

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