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Entry  Sat May 18 22:25:30 2019, Anjali, Update, 2micronLasers, Characterization of new detector setup.pngbeat_note.pdfNoise_floor.pdf
    Reply  Thu May 23 02:53:19 2019, Anjali, Update, 2micronLasers, Characterization of new detector 
Message ID: 2350     Entry time: Thu May 23 02:53:19 2019     In reply to: 2346
Author: Anjali 
Type: Update 
Category: 2micronLasers 
Subject: Characterization of new detector 

FC/UPC to FC/APC patch cord has arrived. I repeated the DC characterisation of the photodetector with this patchcord. The couping is improving by about 2 dB (Table below shws the result)

Laser diode current (mA) Input power (mW) Output voltage (mv)
50 0.5 11
70 0.9 20.7
90 1.3 30.3
Quote:

In this case, the input power was measured after the isolator.The power to voltage conversion is linear. The voltage levels are very low because this is a non-amplified detector. Also, the detector is coupled to a FC/UPC patch cord and we have all FC/APC fiber connectors. So, there could be some coupling loss from FC/APC to FC/UPC. FC/APC to FC/UPC conversion patch cord is ordered. We can check the performance again after it is arrived.
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