Patent ID: 9377665
Filing Date: 2016-06-28
CPC Classification: G02F

Claim Text:
1. An optical modulator having a 2×2 coupler comprising: a substrate that has electrooptical effect and has a Mach-Zehnder modulator that has a 2×2 coupler acting as a splitter, two intermediate waveguides coupled to outputting waveguides of the splitter and another 2×2 coupler acting as a combiner coupled to the two intermediate waveguides; and a suppresser that suppresses a power of an output light from an uncoupled waveguide that is under an open condition by being coupled to no waveguide and an input light into the uncoupled waveguide of at least one of the 2×2 couplers in an extending direction of the Mach-Zehnder modulator.