US 12,113,576 B2
Transmitter circuit, optical module, and communications device
Zhiwei Li, Wuhan (CN); Zhongzhi Shang, Shenzhen (CN); and Wenjun Shi, Wuhan (CN)
Assigned to Huawei Technologies Co., Ltd., Shenzhen (CN)
Filed by Huawei Technologies Co., Ltd., Shenzhen (CN)
Filed on Nov. 28, 2022, as Appl. No. 18/070,126.
Application 18/070,126 is a continuation of application No. PCT/CN2021/093448, filed on May 12, 2021.
Claims priority of application No. 202010477470.2 (CN), filed on May 29, 2020.
Prior Publication US 2023/0113709 A1, Apr. 13, 2023
Int. Cl. H04B 10/50 (2013.01); H01S 5/042 (2006.01); H04B 10/40 (2013.01)
CPC H04B 10/504 (2013.01) [H01S 5/042 (2013.01); H04B 10/40 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A transmitter circuit, comprising a driver and a directly modulated laser (DML), wherein
a positive electrode of the driver is connected to a positive electrode of the DML, a negative electrode of the DML is connected to a voltage terminal, and the negative electrode of the DML is connected to a ground terminal through a capacitor;
the driver is configured to generate a drive current based on an input signal, and output the drive current to the DML through the positive electrode of the driver; and
the DML is configured to output a first part of current of the drive current to the ground terminal through the capacitor, and output a second part of current of the drive current to the voltage terminal.