Laser module
AssigneeSumitomo Electric Industries, Ltd.
InventorHirotaka Oomori
Life of this patent
Estimating the term…
Abstract
A laser module has two semiconductor laser devices and a laser driving circuit. These laser devices are placed adjacent to each other. The laser driving circuit has normal and reverse phase data output terminals. One semiconductor laser device is connected to the normal phase data output terminal, and the other semiconductor laser device is connected to the reverse phase data output terminal. When a series of identical bits is output, the temperature changes of the two laser devices are complementary. Accordingly, the temperature variation of each laser device is moderated. Thus, the variation in the amount of chirp can be reduced.
Claims16
A laser module for emitting laser signal light, comprising:
- first and second semiconductor laser devices placed adjacent to each other;
- a laser driving circuit having a first output terminal for a normal phase data and a second output terminal for a reverse phase data;
- and
- an optical system for guiding laser light generated in said first semiconductor laser device to an outside of said laser module,
- wherein said first semiconductor laser device is connected to one of the first and second output terminals, and
- wherein said second semiconductor laser device is connected to the other of the first and second output terminals.
A laser module for emitting laser signal light, comprising:
- a semiconductor laser device;
- a laser driving circuit having a first output terminal for a normal phase data and a second output terminal for a reverse phase data;
- and
- an optical system for guiding laser light generated in said semiconductor laser device to an outside of said laser module,
- wherein said laser device comprises:
- first and second active layers extending in parallel to each other;
- a first electrode connected to one of said first and second output terminals of the laser driving circuit, said first electrode providing a current from said laser driving circuit into said first active layer;
- and
- a second electrode connected to the other of said first and second output terminals, said second electrode providing a current from said laser driving circuit into said second active layer, and
- wherein said optical system guides laser light generated in said first active layer to an outside of said laser module.
Dependencies are inferred from the claim text.