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|Title:||Advanced noise reduction techniques for ultra-low phase noise optical-to-microwave division with femtosecond fiber combs|
|Citation:||IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2011; 58(5):900-908|
|Wei Zhang, Zhenyu Xu, Michel Lours, Rodolphe Boudot, Yann Kersalé, Andre N. Luiten, Yann Le Coq and Giorgio Santarelli|
|Abstract:||We report what we believe to be the lowest phase noise optical-to-microwave frequency division using fiber-based femtosecond optical frequency combs: a residual phase noise of −120dBc/Hz at 1Hz offset from an 11.55 GHz carrier frequency. Furthermore, we report a detailed investigation into the fundamental noise sources which affect the division process itself. Two frequency combs with quasi-identical configurations are referenced to a common ultrastable cavity laser source. To identify each of the limiting effects, we implement an ultra-low noise carrier-suppression measurement system, which avoids the detection and amplification noise of more conventional techniques. This technique suppresses these unwanted sources of noise to very low levels. In the Fourier frequency range of ~200 Hz to 100 kHz, a feed-forward technique based on a voltage-controlled phase shifter delivers a further noise reduction of 10dB. For lower Fourier frequencies, optical power stabilization is implemented to reduce the relative intensity noise which causes unwanted phase noise through power-to-phase conversion in the detector. We implement and compare two possible control schemes based on an acousto-optical modulator and comb pump current. We also present wideband measurements of the relative intensity noise of the fiber comb.|
|Rights:||© 2011 IEEE|
|Appears in Collections:||Chemistry and Physics publications|
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