Differential quadrature phase-shift modulator and method for setting driving voltage thereof
US7720392B2 · kind B2 · utility
13Cited by
2References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 16, 2005 |
| Grant date | May 18, 2010 |
| Priority date | — |
| Expiry date | Apr 24, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/212
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The present invention is directed toward a method for setting a driving voltage of a differential quadrature phase-shift modulator, this method making signal quality superior in response to an individual difference in extinction ratio due to variations in manufacture of a device. To this end, signal quality of differential quadrature phase-shift modulated light output from a differential quadrature phase-shift modulator is acquired. An average amplitude of a first or second driving voltage signal is adjusted according to the signal quality of the thus-acquired differential quadrature phase-shift modulated light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.