Patent ID: 9448426
Filing Date: 2016-09-20
CPC Classification: G02F

Claim Text:
1. A Mach-Zehnder modulator comprising: a conductive semiconductor region disposed on a principal surface of a substrate, the conductive semiconductor region extending in a direction of a first axis, the conductive semiconductor region having a first conductivity type; a first waveguide arm disposed on the conductive semiconductor region, the first waveguide arm extending in the direction of the first axis; a second waveguide arm disposed on the conductive semiconductor region, the second waveguide arm extending in the direction of the first axis; a first electrode disposed on the first waveguide arm, the first electrode receiving a first drive signal which is applied to the first waveguide arm; a second electrode disposed on the second waveguide arm, the second electrode receiving a second drive signal which is applied to the second waveguide arm; a first ground electrode disposed on the conductive semiconductor region, the first ground electrode being electrically connected to a reference potential; and a second ground electrode disposed on the conductive semiconductor region, wherein the first and second drive signals constitute a differential signal, and the second ground electrode is electrically connected to the first ground electrode via the conductive semiconductor region.