Patent ID: 9627848
Date: 2017-04-18
CPC Classifications: H01S

Claim:
1. A laser diode circuit comprising: a laser diode having an anode and a cathode; a laser diode driver including a first biasing current source, a second biasing current source, a first modulation current source, and a second modulation current source, the first biasing current source and the first modulation current source being connected to the anode of the laser diode at a first node and the second modulation current source being connected to the cathode of the laser diode at a second node; a first laser diode biasing inductor with one end connected to the anode of the laser diode at the first node and another end connected to a voltage supply; a second laser diode biasing inductor with one end connected to the cathode of the laser diode at the second node and another end connected the second biasing current source of the laser diode driver; a modulator configured to control the modulating current of the laser diode by switching between a first modulation current drawn by the first modulation current source and a second modulation current drawn by the second modulation current source to modulate a light emitted by the laser diode, the first modulation current flowing through the first node and bypassing the laser diode, the second modulation current flowing through the laser diode and the second node; and a biasing current controller configured to control the biasing current of the laser diode by switching between a first biasing current drawn by the first biasing current source during a power-up or power-down operation of the laser diode and a second biasing current drawn by the second biasing current source during the modulation of light emitted by the laser diode, the first biasing current flowing through the first node and bypassing the laser diode, and the second biasing current flowing through the laser diode and the second node.