40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log  Not logged in ELOG logo
 List  |  Find  |  Login  |  Help 
Entry  Wed Apr 24 14:24:40 2013, Riju, Update, , PD frequency response PD_freq_resp.pdf
    Reply  Wed Apr 24 14:36:06 2013, Jenne, Update, RF System, PD frequency response 
       Reply  Thu Apr 25 00:59:37 2013, Riju, Update, RF System, PD frequency response 
Message ID: 8488     Entry time: Thu Apr 25 00:59:37 2013     In reply to: 8485
Author: Riju 
Type: Update 
Category: RF System 
Subject: PD frequency response 

Quote:

I think you have the splitter that splits the RF signal from the network analyzer in the wrong place. 

Usually you split the signal immediately after the RF Out, so that half of the signal goes to the A-input of the Analyzer, and the other half goes to your controller (here, the laser diode controller).  Then you would take the output of your controller and go straight to the actual laser diode, with no splitting in this path.

 Here our device under test is the photodiode. So for the reference I wanted to retain the response of the laser diode controller. Otherwise I have to consider the transfer function of that LDC too. I may check both the options at the time of experiment.

Thanks

ELOG V3.1.3-