We synchronize an 8.06 GHz microwave signal from a voltage-controlled oscillator with an optical pulse train from a 77.5 MHz mode-locked Er-fiber laser using a fiber-based optical-microwave phase detector. The residual phase noise between the optical pulse train and the synchronized microwave signal is () at 1 Hz (5 kHz) offset frequency, which results in 838 as integrated rms timing jitter [1 Hz–1 MHz]. The long-term residual phase drift is 847 as (rms) measured over 2 h, which reaches fractional frequency instability at 1800 s averaging time. This method has a potential to provide both subfemtosecond-level short-term phase noise and long-term phase stability in microwave extraction from mode-locked fiber lasers.
© 2012 Optical Society of AmericaFull Article | PDF Article
Inuk Kang, Christophe Dorrer, and Francesco Quochi
Opt. Lett. 28(22) 2264-2266 (2003)
J. Kim, F. X. Kärtner, and M. H. Perrott
Opt. Lett. 29(17) 2076-2078 (2004)
J. Kim, F. X. Kärtner, and F. Ludwig
Opt. Lett. 31(24) 3659-3661 (2006)