Nishino

In my calculation, the best PCC round-trip phase is 1) when the transmittance light from ETM gets maximum AND 2) monitoring the transmittance light from the PCM, the relative angle between the signal and main beam becomes pi/4. 

Adjusting the PCC angle to meet 1) and the signal beam angle to meet 2) condition by hand, I obtained the result shown in Fig. 2). Red is the speed state and blue is the position state. Somehow it behaves weird at high-frequencies but taking their ratio (green) it could be fitted well with a model. I guess the photo-detetor calibration went wrong for some reason.