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Photonic Generation of Low-Phase-Noise Microwave Signals | | T. M. Fortier
; M. S. Kirchner
; F. Quinlan
; J. Taylor
; J. C. Bergquist
; T. Rosenband
; N. Lemke
; A. Ludlow
; Y. Jiang
; C. W. Oates
; S. A. Diddams
; | | Date: |
19 Jan 2011 | | Abstract: | Microwave oscillators with low phase- or timing-noise enable important
scientific and technological advances. In radar and imaging systems, low phase
noise and associated timing jitter provide better resolution and rejection of
unwanted background. Communications and digital sampling systems rely on
low-noise oscillators to achieve higher bandwidths and resolution.
Additionally, stable microwave oscillators are important for large baseline
interferometry, precision spectroscopy and realization of atomic time. Here we
show a photonic microwave oscillator based on a frequency-stabilized continuous
wave (CW) laser and a femtosecond laser frequency comb that provides a 10 GHz
electrical signal with fractional frequency instability leq 8e-16 at 1 s of
averaging. The corresponding phase noise is L(f) = -104 dBc/Hz at 1 Hz offset
from the carrier, decreasing to near the photon shot-noise limited floor of
-157 dBc/Hz at an offset of 1 MHz. The integrated timing jitter over this
bandwidth is 760 attoseconds. This absolute timing noise is verified by
operation and comparison of two independent photonic oscillators, and it
characterizes one of the lowest phase noise microwave signals generated by any
source. | | Source: | arXiv, 1101.3616 | | Services: | Forum | Review | PDF | Favorites | |
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