Optical modulation device
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsIsao Watanabe, Satoshi Komurasaki
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Abstract
The disclosed device comprises two duty ratio detectors for detecting respective duty ratios of an input modulation signal modulating an incoming light beam and a modulated intensity-of-light signal proportional to an intensity of an outgoing light beam, a differential amplifier for producing a difference between both duty ratios, and a bias control for supplying this difference to an optical modulator through a bias amplifier.
Claims3
An optical modulation device comprising an optical modulator for modulating an incoming light beam in accordance with an input modulation signal, an optical detector for producing from a modulated optical output from said optical modulator an intensity-of-light signal proportional to an intensity of said modulated optical output, a first and a second duty ratio detector for detecting duty ratios of said input modulation signal and said intensity-of-light signal from said optical detector respectively, a differential amplifier for producing a difference signal between outputs from said first and second duty ratio detectors, and a bias amplifier for applying said difference signal from said differential amplifier to said optical modulator.
Dependencies are inferred from the claim text.