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.
Claims7
A laser module for emitting laser signal light, comprising:
- first and second semiconductor laser devices placed adjacent to each other, said first laser device having a light-transmitting front surface and a light-receiving rear surface;
- a laser driving circuit having a first output terminal for a normal phase data and a second output terminal for a reverse phase data;
- a photodetector disposed to receive laser light leaking from the rear surface of said first laser device;
- and
- an optimal 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 conected to the other of the first and second output terminals.
Dependencies are inferred from the claim text.