Broadband Phase-Noise Suppression in a Yb-Fiber Frequency Comb

Details Broadband Phase-Noise Suppression in a Yb-Fiber Frequency Comb Broadband Phase-Noise Suppression in a Yb-Fiber Frequency Comb

2011-01-29

arxiv.org/abs/1101.5727v1

Optics Letters, Vol. 36, Issue 5, pp. 743-745 (2011)

Physics

Optics

4 pages, 3 figures

Scientific paper

10.1364/OL.36.000743

We report a simple technique to suppress high frequency phase noise of a Yb-based fiber optical frequency comb using an active intensity noise servo. Out-of-loop measurements of the phase noise using an optical heterodyne beat with a continuous wave (cw) laser show suppression of phase noise by \geq7 dB out to Fourier frequencies of 100 kHz with a unity-gain crossing of -700 kHz. These results are enabled by the strong correlation between the intensity and phase noise of the laser. Detailed measurements of intensity and phase noise spectra, as well as transfer functions, reveal that the dominant phase and intensity noise contribution above -100 kHz is due to amplified spontaneous emission (ASE) or other quantum noise sources.

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