Wide temperature range uncooled transceiver module for uncontrolled environments
US7570679B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 21, 2007 |
| Grant date | Aug 4, 2009 |
| Priority date | — |
| Expiry date | Feb 21, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/02453
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A laser transmitter within an optical transceiver includes a heating element. The heating element is coup led to the laser package and is controlled to allow the laser to be heated to a higher temperature than the ambient temperature when low environmental temperature extremes occur. The transmitter includes a semiconductor laser having an optimal operational temperature range, a laser driver circuit coupled to the laser that provides a modulation current and a bias current to drive the laser, a heating element thermally coupled to the laser and a heating control circuit that monitors the bias current applied to the laser for drops in bias current that are indicative of drops in the surrounding ambient temperature. In response to a drop in bias current, the control circuitry energizes the heating element to provide heat to the laser.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.