Marc and Yuhang

For DDS1, we found the signals used for SHG/IRMC/OPO demodulation are smaller than 7dBm. However, the mixers require at least 7dBm signals. Therefore, we decide to install amplifiers for corresponding DDS channels. After the installation, the situation of DDS1 is shown as follows:

DDS1 CH0: DDS output = -8dBm output (for SHG/IRMC modulation)

DDS1 CH1: DDS output+18dB amplifier+power splitter = 7dBm output *2 (for SHG/IRMC demodulation)

DDS1 CH2: DDS output =  -8dBm output (for OPO modulation)

DDS1 CH3: DDS output+18dB amplifier= 10dBm output  (for OPO demodulation)

Since we are using internal amplifiers for SHG/IRMC/OPO demodulation, their old amplifiers will not be used.

We did the test and found that DDS1 board works well and they are outputing good values. Then we optimized all PDH signals, measured TFs and error signals. The results of measurements are attached.