OPTICAL REPEATER

PROBLEM TO BE SOLVED: To enlarge the dynamic range of an input signal and to reduce a level difference between wavelengths in an optical repeater output. SOLUTION: An output detection circuit 30 detects the output level of an optical amplifier 11 and an output detection circuit 50 detects the output...

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Bibliographic Details
Main Authors MIYAO HIROSHI, IWASHITA KATSU, TAKACHIO NOBORU
Format Patent
LanguageEnglish
Published 06.03.1998
Edition6
Subjects
BASIC ELECTRONIC CIRCUITRY
CONTROL OF AMPLIFICATION
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
MULTIPLEX COMMUNICATION
TRANSMISSION
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Summary:PROBLEM TO BE SOLVED: To enlarge the dynamic range of an input signal and to reduce a level difference between wavelengths in an optical repeater output. SOLUTION: An output detection circuit 30 detects the output level of an optical amplifier 11 and an output detection circuit 50 detects the output level of an optical amplifier 13. A level constant control circuit 40 controls the optical amplifier 11 so that the output level of the optical amplifier, which is detected in the output detection circuit 30, becomes constant in accordance with a wavelength multiplexing number. A level constant control circuit 60 controls the optical amplifier 13 so that the output level of the optical amplifier 13, which is detected in the output detection circuit 50, becomes constant in accordance with the wavelength multiplexing number. A variable optical attenuator control circuit 20 detects the input level of an optical repeater and adjusts the attenuation quantity of the variable optical attenuator 12 so that the wavelength dependency of the gains of the optical amplifier 11 and the optical amplifier 13 becomes inverse characteristics in accordance with the input level and the wavelength multiplexing number.
Bibliography:Application Number: JP19960214866