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US 5,963,357 AGranted
Optical modulator
AssigneeFujitsu Limited
InventorsYoshinobu Kubota, Yasuhiro Omori, Toshihiro Otani, Tomoyuki Itoh
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AssigneeFujitsu Limited
InventorsYoshinobu Kubota, Yasuhiro Omori, Toshihiro Otani, Tomoyuki Itoh
Estimating the term…
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.
An optical modulator comprising:
An optical modulator including a substrate having an opposing top and bottom and a plurality of sides extending between the top and bottom, an optical waveguide formed on the top of said substrate, the optical waveguide having two subwaveguides and a combining portion where the subwaveguides meet, the optical waveguide emitting at least one of radiation light and signal leakage light and an electrode formed on the top of said substrate to control light propagated in said optical waveguide, comprising:
A method for forming an optical modulator comprising the steps of:
An optical modulator comprising:
Dependencies are inferred from the claim text.