Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1997-07-14
1999-10-05
Epps, Georgia
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359187, 385 2, 385 3, G02F 1035, G02F 103
Patent
active
059633573
ABSTRACT:
An optical modulator for modulating light emitted from a signal light source has a substrate having electrooptic effect, an optical waveguide of a Mach-Zehnder type formed on the substrate, an electrode formed on the substrate to control light propagated in the optical waveguide, an interference light generating means for making radiation light radiated from the optical waveguide and signal light leaking from the optical waveguide interfere with each other to generate interference light, and emitting the interference light from an end surface of the substrate, a photo-detector for monitoring the interference light of the radiation light and the signal light, and a signal controlling circuit for controlling an operating point of the optical modulator according to a change of the interference light monitored by the photo-detector It is thereby possible to prevent degradation of a distinction ratio due to a shift of the operating point of the optical modulator so as to allow stable optical modulation, while facilitating a design of the mechanism of the optical modulator.
Itoh Tomoyuki
Kubota Yoshinobu
Omori Yasuhiro
Otani Toshihiro
Burke Margaret
Epps Georgia
Fujitsu Limited
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