公开(公告)号：US10103513B1

公开(公告)日：2018-10-16

申请号：US15631594

申请日：2017-06-23

Applicant: Google Inc.

Inventor： Tao Zhang ,  Liang Du ,  Xiangjun Zhao ,  Changhong Joy Jiang ,  Cedric Fung Lam ,  Shuang Yin ,  Adam Edwin Taylor Barratt

IPC: H01S5/042 ,  H01S5/068 ,  H01S5/125 ,  H01S5/30

Abstract: A method for biasing a tunable laser during burst-on and burst-off states through a common-cathode laser driving circuit includes delivering a bias current to an anode of a gain-section diode having a shared substrate with the laser, and receiving a burst mode signal indicative of a burst-on state or a burst-off state. When the burst mode signal is indicative of the burst-off state, the method includes sinking a sink current away from the anode of the gain-section diode. The sink current is less than the bias current delivered to the anode of the gain-section diode. When the burst mode signal transitions to be indicative of the burst-on state from the burst-off state, the method includes ceasing the sinking of the sink current away from the anode of the gain-section diode, and delivering an overshoot current to the anode of the gain-section diode to accelerate heating of the gain-section diode.