Since we want a reasonably large coherent control error signal. We exchange 'Demod CC' amplification channel with 'EOM SHG+IRMC' channel.

Reason: SHG EOM channel has an amplification factor of 20dB but we are using a 12dB attenuator to reduce sideband amplitude. This means 8dB of amplification is enough.

               While CC DEMOD channel had amplification of 14dB. Actually, the more the better. So we decide to exchange it with SHG EOM channel.

After the exchange, we put 6dB attenuator for SHG EOM.

In practice, we could use the AOM channel which has a 37dB amplification. However, I tested it and the AOM channel seems broken.

In the end, the coherent control error signal becomes around 60mV peak to peak.