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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 37, Iss. 14 — Jul. 15, 2012
  • pp: 2958–2960

Subfemtosecond synchronization of microwave oscillators with mode-locked Er-fiber lasers

Kwangyun Jung and Jungwon Kim  »View Author Affiliations

Optics Letters, Vol. 37, Issue 14, pp. 2958-2960 (2012)

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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 133dBc/Hz (154dBc/Hz) 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 4×1019 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 America

OCIS Codes
(120.3940) Instrumentation, measurement, and metrology : Metrology
(320.7090) Ultrafast optics : Ultrafast lasers
(320.7160) Ultrafast optics : Ultrafast technology
(350.4010) Other areas of optics : Microwaves
(060.5625) Fiber optics and optical communications : Radio frequency photonics

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: February 24, 2012
Revised Manuscript: June 1, 2012
Manuscript Accepted: June 5, 2012
Published: July 13, 2012

Kwangyun Jung and Jungwon Kim, "Subfemtosecond synchronization of microwave oscillators with mode-locked Er-fiber lasers," Opt. Lett. 37, 2958-2960 (2012)

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