| US 7,480,091 B2 | ||
| Delay-line demodulator and method of adjusting a phase shift in the demodulator | ||
| Junichi Hasegawa, Tokyo (Japan); and Kazutaka Nara, Tokyo (Japan) | ||
| Assigned to The Furukawa Electric Co., Ltd., Tokyo (Japan) | ||
| Filed on Mar. 05, 2008, as Appl. No. 12/42,768. | ||
| Claims priority of application No. 2007-055888 (JP), filed on Mar. 06, 2007; and application No. 2008-049222 (JP), filed on Feb. 29, 2008. | ||
| Prior Publication US 2008/0239465 A1, Oct. 02, 2008 | ||
| Int. Cl. G02F 2/00 (2006.01) | ||
| U.S. Cl. 359—325 [375/324; 385/1; 398/205] | 11 Claims |
| 1. A delay-line demodulator comprising:
a first 2×2 Mach-Zehnder interferometer and a second 2×2 Mach-Zehnder interferometer connected to two waveguides branched
from an optical input waveguide respectively;
at least one heater formed on each of two waveguides having different waveguide length and forming the first Mach-Zehnder
interferometer; and
at least one heater formed on each of the two waveguides having different waveguide length and forming the second Mach-Zehnder
interferometer.
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