Optical modulator
US7263244B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 30, 2005 |
| Grant date | Aug 28, 2007 |
| Priority date | — |
| Expiry date | Dec 30, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/0327
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical modulator of the invention includes a substrate having an optical waveguide and an electric waveguide formed therein, a driving circuit that generates a modulation electric signal, a relay circuit that gives the modulation electric signal to the electric waveguide via an electric filter circuit made of a capacitor and a resistor, and a terminal resistor that terminates the modulation electric signal that has propagated through the electric waveguide. The sum of the impedance of the electric filter circuit and the resistance of the terminal resistor is set to be substantially equal to the impedance of the driving circuit. Also, the resistance of the terminal resistor is set to be substantially equal to the characteristic impedance of the electric waveguide. Then, deterioration of the electric reflection characteristic in a low-frequency region can be restrained even if the frequency characteristic of the optical response is flattened and leveled by application of the electric filter circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.