u/lowqualitydrip

I’m using an eospace phase modulator EOM at 1012 nm to modulate the input light at 2Ghz. Vpi modulation is 10 dbm higher than the specs at 2Ghz. At low frequencies, 400Mhz, vpi is 5dbm higher than the specs suggest. I have verified that the input polarization is linear and stable. The internal resistance of the EOM is 45 ohms - roughly as expected (50 ohm is spec). I’ve tried this experiment with another EOM across the lab, with same instruments, and it worked. That eom is rated at 960nm and I ran it at 1012.

Any ideas?