Abstract
We demonstrate a balanced optical-microwave phase detector (BOMPD) showing robust long-term optical-RF synchronization characteristics with sub-femtosecond residual timing drift over 24 hours under laboratory conditions without active temperature control of optical and electronic paths. Using this BOMPD, a 10.833 GHz Sapphire-loaded cavity oscillator (SLCO) was successfully disciplined by the pulse train from a 216.66 MHz femtosecond laser oscillator with a relative RMS jitter below one femtosecond integrated from 1 Hz to 1 MHz.
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