公开(公告)号：US10897311B2

公开(公告)日：2021-01-19

申请号：US16452389

申请日：2019-06-25

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Liqiang Yu ,  Liming Fang ,  Sulin Yang ,  Xiaofeng Zhang

IPC: H04B10/04 ,  H04B10/50 ,  G02F1/015 ,  H01S5/00 ,  H04B10/564

Abstract: An optical signal modulation circuit includes a laser (DFB), a modulator (EAM), and an operational amplifier. The laser (DFB) generates a laser to stimulate the modulator (EAM) to generate a photon-generated current (ip), a first port (a) of the modulator (EAM) is connected to a first input voltage (Vbias), a second port (b) of the modulator (EAM) is connected to an inverting input end of the operational amplifier, a non-inverting input end of the operational amplifier is connected to a second input voltage (Vin), and an output end of the operational amplifier is connected to the first port (a) of the modulator. In the modulation circuit, a photon-generated current (ip) of the EAM is fed back to the operational amplifier, to implement a linear relationship between the second input voltage (Vin) and the photon-generated current (ip) of the EAM, and obtain a linear EML transmission curve, namely, a high-linearity EML.