Optical transmitter utilizing a bistable distributed feedback semiconductor laser
US4947458A · kind A · utility
2Cited by
9References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 30, 1985 |
| Grant date | Aug 7, 1990 |
| Priority date | — |
| Expiry date | Jul 30, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/2275
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A bistable distributed feedback laser device is employed for transmitting optical signals. A bias current which is less than the threshold lasing turnoff current is supplied to the laser. A drive circuit provides a pulse current which, when added to the bias current, exceeds the threshold lasing turnon current. In this manner, the device is modulated so as to traverse the hysteresis region, hereby preventing undesirable expansion of the spectrum line width.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.