Invention Grant
- Patent Title: Common cathode laser driving circuit
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Application No.: US16148526Application Date: 2018-10-01
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Publication No.: US10461498B2Publication Date: 2019-10-29
- Inventor: Tao Zhang , Liang Du , Xiangjun Zhao , Changhong Joy Jiang , Cedric Fung Lam , Shuang Yin , Adam Edwin Taylor Barratt
- Applicant: Google LLC
- Applicant Address: US CA Mountain View
- Assignee: Google LLC
- Current Assignee: Google LLC
- Current Assignee Address: US CA Mountain View
- Agency: Honigman LLP
- Agent Brett A. Krueger
- Main IPC: H01S5/042
- IPC: H01S5/042 ; H01S5/068 ; H01S5/0625 ; H04J14/02 ; H04B10/40 ; H04B10/25 ; 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.
Public/Granted literature
- US20190036302A1 Common Cathode Laser Driving Circuit Public/Granted day:2019-01-31
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