Phase control apparatus and optical DQPSK receiver
US7684713B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 7, 2006 |
| Grant date | Mar 23, 2010 |
| Priority date | — |
| Expiry date | Aug 17, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/66
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A calculation processing unit controls temperature of a Peltier device based on a slope of a waveform obtained by subtracting a waveform of a B-arm monitoring signal from a waveform of an A-arm monitoring signal and a value obtained by subtracting a value B of the B-arm monitoring signal from a value A of the A-arm monitoring signal. Similarly, the calculation processing unit controls a phase of the A-arm and a phase of the B-arm. An A-arm side micro-controller controls temperature of an A-arm side heater 22 based on the value of the A-arm monitoring signal, and controls the phase of the A-arm. A B-arm side micro-controller controls temperature of a B-arm side heater based on the value B of the B-arm monitoring signal, and controls the phase of the B-arm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.