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Entry   amplifier, posted by Huan Wang at Optical room about lasers and optics 1st_stage_amplifier_monitoring_photodiode_signal.jpg
    Reply   amplifier, posted by Huan Wang at Optical room about lasers and optics 
Message ID: 58     Entry time: Wed Jun 19 18:54:00 2019     Reply to this: 59
 Author: Huan Wang 
 Status: Fixed 
 Type: info 
 Category: lasers and optics 
 Location: Optical room 
 Title: amplifier 

Onefive output power is 24mW now, and 2.41mW(after EOM) injected into fiber,

a injection power monitor added, 99% (2.06mW)  injected into amplifier, 1% (16.1uW) monitored with photodiode DET36A/M, which gives ~500mV DC signal on oscilloscope with 1Mohm impedanc;

 

First stage amplifier works good, monitoring phtodiode gives more than 200mV DC signal with 50ohm impedance on oscilloscope (as attached photo);

 

Second stage, the old monitoring photodiode is broken, a new monitoring photodiode is connected, which we don't have reference data for it,

on the optical output port of the monitoring signal, it's written 150mW, but at where we measured 40mW.

Attachment 1: 1st_stage_amplifier_monitoring_photodiode_signal.jpg  177 kB  | Show | Show all
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