Light emitting element driving circuit, communication device...

Details Light emitting element driving circuit, communication device... Light emitting element driving circuit, communication device...

2006-12-26

2006-12-26

Philogene, Haissa (Department: 2821)

Coherent light generators

Particular beam control device

Modulation

C372S034000, C372S029011, C372S038070, C372S038020, C315S291000, C315S224000, C315S169300

Reexamination Certificate

active

07154921

ABSTRACT:
A light emitting element driving circuit drives a surface-emitting element, and the light emitting element driving circuit is equipped with a bias current driving circuit that supplies a generally constant bias current to the surface-emitting element, a modulation current driving circuit that supplies to the surface-emitting element a modulation current superimposed on the bias current, and a temperature detection circuit that detects the temperature of the surface-emitting element, wherein the modulation current driving circuit decreases the current amount of the modulation current, when the temperature detected rises. The bias current driving circuit may preferably supply the bias current to the surface-emitting element through a coil, and the modulation current driving circuit may preferably supply the modulation current to the surface-emitting element through a capacitor.

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“3.0V to 5.5V, 2-5Gbps VCSEL and Laser Driver,” Maxim Integrated Products, Searched on May 11, 2004, Internet <URL: http://pdfserv.maxim.ic.com/en/ds/MAX3996.pdf,> pp. 1-16.

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