公开(公告)号：US12126312B1

公开(公告)日：2024-10-22

申请号：US18359564

申请日：2023-07-26

Applicant: II-VI Delaware, Inc.

Inventor： Dinup Sukumaran ,  Richard D. Davis

IPC: H03G3/30 ,  G01J1/44 ,  H03F3/45

CPC classification number: H03G3/30 ,  G01J1/44 ,  H03F3/45475 ,  G01J2001/446 ,  H03G2201/103

Abstract: An optical device for optical signals comprises: a photodiode configured to receive the optical signals; and a linear transimpedance amplifier (TIA) having an input stage, an output stage, and at least one variable gain amplifier (VGA) provided between the input stage and the output stage. The optical device also comprises: an automatic gain control loop configured to rectify an output of the at least one VGA and compare the rectified output with a threshold gain setting to generate an automatic gain control voltage; and a detection circuitry being configured to detect a rate of change in the automatic gain control voltage and being configured to determine a first state indicative of an absence of the optical signals at the photodiode. At least in response to the determined first state, the detection circuitry is configured to disable the output stage of the linear TIA.