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Coherent Optical Phase Transfer over a 32-km Fiber with 1 s Instability at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mn>10</mml:mn><mml:mrow><mml:mo>โ</mml:mo><mml:mn>17</mml:mn></mml:mrow></mml:msup></mml:math>
The phase coherence of an ultrastable optical frequency reference is fully maintained over actively stabilized fiber networks of lengths exceeding 30 km. For a 7-km link installed in an urban environment, the transfer instability is 6 x 10{-18} at 1 s. The excess phase noise of 0.15 rad, integrated from โฆ