Ultralow phase noise microwave generation with an Er:fiber-based optical frequency divider |
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Authors: | Quinlan Franklyn Fortier Tara M Kirchner Matthew S Taylor Jennifer A Thorpe Michael J Lemke Nathan Ludlow Andrew D Jiang Yanyi Diddams Scott A |
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Affiliation: | National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA. fquinlan@boulder.nist.gov |
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Abstract: | We present an optical frequency divider based on a 200 MHz repetition rate Er:fiber mode-locked laser that, when locked to a stable optical frequency reference, generates microwave signals with absolute phase noise that is equal to or better than cryogenic microwave oscillators. At 1 Hz offset from a 10 GHz carrier, the phase noise is below -100 dBc/Hz, limited by the optical reference. For offset frequencies >10 kHz, the phase noise is shot noise limited at -145 dBc/Hz. An analysis of the contribution of the residual noise from the Er:fiber optical frequency divider is also presented. |
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