Interferometer for demodulating differential M-phase shift keying signal
US7860408B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jan 10, 2007 |
| Grant date | Dec 28, 2010 |
| Priority date | — |
| Expiry date | May 3, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/21
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An interferometer for demodulating a differential M-phase shift keying signal includes a PLC type interferometer main body, a heating portion that heats the PLC type interferometer main body, and an intermediate member having a higher stiffness than that of the PLC type interferometer main body, for bonding the PLC type interferometer main body and the heating portion with each other while being sandwiched therebetween. A linear expansion coefficient difference between the PLC type interferometer main body and the intermediate member is equal to or smaller than 4.5×10−6/° C., and a thermal conductivity difference between the PLC type interferometer main body and the intermediate member is equal to or larger than 10 W/mK. A phase of an optical signal flowing through the interferometer is adjusted by using the heating portion and a second heating portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.