The PDs to monitor the fiber output at end Y were cabled incorrectly, now the signals from both of them make it into beckhoff.  The total transition PD needs to be in input 2 on the photodiode amplifier box while the rejected PD is on input 3.  

Using the fiber laser to calibrate these, with 13 mW out of the fiber, there are 0.79mW sent toward the total trans PD, and the DC voltage on that PD is 0.568 with a gain of 0dB.  

with 3.47 mW sent towards the rejected polarization PD, and gain 0dB, the PD reads 2.39V.  

This means the responsivity of the total trans power PD is 0.359 A/W, the rejected polarization PD is 0.344A/W, and the beamsplitter reflectivity for the pick off to the total trans PD is 6.1%.  I have added these to the initialization POU, we need to double check that the calibration comes out OK when we are using the low power beam.  

Yesterday while Max and I were trying to figure out how to use the polarization adjustment box, the total transmitted power dropped from 37 uW to 15 uW, which could be due to a combination of unplugging and plugging the fibers and adjustments to the polarization box.