Naoki, Camilla

We continued the ZM4 PSAMS scan with hot OM2 in 78636. We changed ZM4 PSAMS strain voltage from 7.5V to 5.5V and saw the squeezing and range improvement as shown in the first attachment. The second attachment shows the squeezing imrovement. The squeezing level is 5.2dB around 2 kHz.

We also tried 4.5V ZM4 PSAMS, but it is worse than 5.5V. So we set the ZM4 PSAMS at 5.5V. The ZM5 PSAMS strain voltage is -0.78V.

Everytime we changed ZM4 PSAMS, we compensated the ZM4 pitch alignment with slider and ran SCAN_ALIGNMENT_FDS and SCAN_SQZANG.