Abstract
We demonstrate that balanced optical-microwave phase detectors (BOMPD) are capable of optical-RF synchronization with sub-femtosecond residual timing jitter for large-scale timing distribution systems. RF-to-optical synchronization is achieved with a long-term stability of < 1 fs RMS and < 7 fs pk-pk drift for over 10 hours and short-term stability of < 2 fs RMS jitter integrated from 1 Hz to 200 kHz as well as optical-to-RF synchronization with 0.5 fs RMS jitter integrated from 1 Hz to 20 kHz. Moreover, we achieve a -161 dBc/Hz noise floor that integrates well into the sub-fs regime and measure a nominal 50-dB AM-PM suppression ratio with potential improvement via DC offset adjustment.
Highlights
Sub-femtosecond synchronization between optical and radio-frequency (RF) sources is desirable for realizing a new regime of light and electron bunch control in next-generation light sources [1]
We demonstrate that balanced optical-microwave phase detectors (BOMPD) are capable of optical-RF synchronization with sub-femtosecond residual timing jitter for large-scale timing distribution systems
RF-tooptical synchronization is achieved with a long-term stability of < 1 fs RMS and < 7 fs pk-pk drift for over 10 hours and short-term stability of < 2 fs RMS jitter integrated from 1 Hz to 200 kHz as well as optical-to-RF synchronization with 0.5 fs RMS jitter integrated from 1 Hz to 20 kHz
Summary
Sub-femtosecond (sub-fs) synchronization between optical and radio-frequency (RF) sources is desirable for realizing a new regime of light and electron bunch control in next-generation light sources [1]. Few groups have modified the basic BOMPD scheme with nonreciprocal biasing and balanced detection to improve the BOMPD noise floor down to −154 dBc/Hz and perform optical-RF extraction with sub-fs absolute timing jitter [19] as well as verify up to 60 dB of AM-PM suppression [20] This modified scheme requires additional components that break the inherent symmetry of the Sagnac loop, degrading its long-term stability. We demonstrate that our improved BOMPDs can perform optical-to-RF (and RF-to-optical) synchronization with long-term-stable residual timing jitter in the sub-fs regime as well as achieve an AM-PM suppression ratio greater than 50 dB This confirms the feasibility of BOMPDs for sub-fs synchronization in large-scale timing distribution systems in next-generation light sources
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