title: Precise frequency transfer through a fiber network by use of 1.5-microm mode-locked sources.
abstract: We report the precise transfer of radio-frequency signals by use of the pulse repetition frequency of mode-locked laser sources at 1.5 microm transmitting through a fiber network. The passive transfer instability through a 6.9-km fiber is below 3 x 10(-14) at 1 s, which is comparable with the optical carrier-frequency transfer of a narrow-linewidth cw laser. The instability of the measurement system is below 7 x 10(-15) at 1 s. It is noted that the pulsed mode of operation offers almost an order-of-magnitude improvement in stability at 1 s over that with a sinusoidal amplitude modulation on an optical carrier.
authors.affiliation: JILA, National Institute of Standards and Technology and University of Colorado, Boulder, Colorado 80309-0440, USA.
authors.forename: Kevin W
authors.initials: KW
authors.lastname: Holman
authors.forename: David J
authors.initials: DJ
authors.lastname: Jones
authors.forename: Darren D
authors.initials: DD
authors.lastname: Hudson
authors.forename: Jun
authors.initials: J
authors.lastname: Ye