Abstract
In this Letter we report on an all-optical-fiber approach to the generation of ultra-low-noise microwave signals. We make use of two erbium fiber mode-locked lasers phase locked to a common ultrastable laser source to generate an signal with an unprecedented relative phase noise of at from the carrier. The residual frequency instability of the microwave signals derived from the two optical frequency combs is below at and about at (in bandwidth, three days of continuous operation).
© 2009 Optical Society of America
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