Optical amplifying apparatus and linear relay optical amplifier

Details Optical amplifying apparatus and linear relay optical amplifier Optical amplifying apparatus and linear relay optical amplifier

1997-04-04

2000-04-25

Moskowitz, Nelson

Optical: systems and elements

Optical amplifier

Correction of deleterious effects

359124, 359160, 359341, H01S 316, H04B 1012

Patent

active

060550937

ABSTRACT:
A wavelength multiplexing optical transmitting apparatus includes a plurality of optical transmitters for transmitting optical signals having mutually different wavelengths, a wavelength multiplexing circuit for wavelength multiplexing optical signals, an optical amplifier for directly amplifying the wavelength multiplexed optical signal and for producing an amplified multiplexed optical signal, an optical signal counting detector for branching the amplified multiplexed optical signal into signals of the respective wavelengths and for detecting the number of optical signals presently being transmitted, and an optical amplifier control circuit for controlling an output from the optical amplifier according to the number of optical signals; the optical amplifier includes a fiber made of a material to which a rare earth element is added and an excitation light to the fiber; the optical amplifier control circuit includes an excitation light control circuit for controlling an intensity of the excitation light according to the number of light signals; wherein to obtain an intensity of amplified optical signal predetermined according to the number of light signals, the excitation light control circuit sets an injection current to the excitation light source.

REFERENCES:
patent: 5510926 (1996-04-01), Bayart et al.
patent: 5561552 (1996-10-01), Shibuya
patent: 5764404 (1998-06-01), Yamane et al.

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