cqvip:The stability of the drive current is very important for a laser driver,while it is difficult to maintain the current stable at a high value for the laser driver.On the other hand,the range of the drive current is expected to be as wide as possible to be applied to different kinds of lasers.In this paper,a high current laser driver for the superluminescent light emitting diode(SLED) is presented,which is used in the optic fiber gyro embedded by a 0.35 m bipolar complementary metal-oxide-semiconductor transistor(BiCMOS) process.The laser driver provides automatic power control and certain value of current determined by the external resister.The system is based on the optic-electric feedback theory and uses the closed-loop control technique to maintain the drive current stable.The system is capable of producing stable current ranges from 4 mA to 200 mA when the value of external resister changes.
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