Temperature control for coarse wavelength division multiplexing systems
US7369587B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Dec 21, 2004 |
| Grant date | May 6, 2008 |
| Priority date | — |
| Expiry date | Mar 20, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/06804
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Optoelectronic devices and methods are used to maintain a CWDM transmitter operating within design parameters over an extended ambient temperature range. In order to avoid excessive wavelength drift with temperature shifts, lasers in the CWDM transmitters are heated or cooled to a selected temperature, for example by using a thermoelectric cooler. By heating and cooling the lasers, any wavelength drift that an ambient temperature variation might inflict on the laser is minimized to the range hotter or colder than the selected temperature. As the temperature range of the laser increases above the selected temperature, the AC swing driving the laser is increased to maintain a sufficient extinction ratio for acceptable transmitter performance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.