scholarly journals Laser frequency counting and frequency modulation width measurement from a fft signal

2012 ◽  
Vol 19 (3) ◽  
pp. 565-572
Author(s):  
Petr Křen
Keyword(s):  
Frequency Modulation ◽  
High Frequency ◽  
Frequency Synthesizer ◽  
Signal To Noise Ratio ◽  
Frequency Measurement ◽  
Laser Frequency ◽  
Optical Frequency ◽  
Frequency Stabilized Laser ◽  
Frequency Counting ◽  
Fft Analysis

Abstract A new method of optical frequency beat counting based on fast Fourier transform (FFT) analysis is described. Signals with a worse signal-to-noise ratio can be counted correctly comparing to the conventional counting method of detecting each period separately. The systematic error of FFT counting below 10 Hz is demonstrated and can be decreased. Additionally the modulation width of a frequency-stabilized laser with high frequency modulation index can be simultaneously measured during a carrier frequency measurement against an optical frequency synthesizer or other laser.

scholarly journals Accurate laser frequency locking to optical frequency combs under low-signal-to-noise-ratio conditions

2020 ◽  
Vol 91 (3) ◽  
pp. 033202
Author(s):  
C. Guo ◽  
M. Favier ◽  
N. Galland ◽  
V. Cambier ◽  
H. Álvarez-Martínez ◽  
...  
Keyword(s):  
Signal To Noise Ratio ◽  
Laser Frequency ◽  
Optical Frequency ◽  
Signal To Noise ◽  
Frequency Locking ◽  
Optical Frequency Combs ◽  
Frequency Combs ◽  
Noise Ratio

Study of High Precision Frequency Measurement Method of Power System Based on DSP

2011 ◽  
Vol 403-408 ◽  
pp. 3030-3034
Author(s):  
Cui Yun Gao ◽  
Ming Liu ◽  
Wen Jing Li ◽  
Ru Han
Keyword(s):  
Power Systems ◽  
High Precision ◽  
High Frequency ◽  
Detection Method ◽  
Signal To Noise Ratio ◽  
Frequency Measurement ◽  
Frequency Noise ◽  
Zero Crossing ◽  
Signal Simulation ◽  
Precision Frequency

In the power systems, frequency is an important parameter for harmonic analysis. This paper proposes a modified high precision zero-crossing detection method. The high frequency noise will affect the power system’s frequency measurement, FIR processing is used for the power signal. Simulation shows that after effective De-noising or when the signal-to-noise ratio (SNR) is higher, the method can reach the precision of 0.01Hz and meet the requirements of frequency measurement precision.

scholarly journals Optical frequency measurement across a 104-THz gap with a femtosecond laser frequency comb

2000 ◽  
Vol 25 (3) ◽  
pp. 186 ◽  
Author(s):  
Scott A. Diddams ◽  
David J. Jones ◽  
Long-Sheng Ma ◽  
Steven T. Cundiff ◽  
John L. Hall
Keyword(s):  
Femtosecond Laser ◽  
Frequency Comb ◽  
Frequency Measurement ◽  
Laser Frequency ◽  
Optical Frequency

scholarly journals A broadband chip-scale optical frequency synthesizer at 2.7 × 10−16 relative uncertainty

2016 ◽  
Vol 2 (4) ◽  
pp. e1501489 ◽  
Author(s):  
Shu-Wei Huang ◽  
Jinghui Yang ◽  
Mingbin Yu ◽  
Bart H. McGuyer ◽  
Dim-Lee Kwong ◽  
...  
Keyword(s):  
Solid State ◽  
Degrees Of Freedom ◽  
Frequency Synthesizer ◽  
Frequency Comb ◽  
Laser Frequency ◽  
Optical Frequency ◽  
Light Sources ◽  
Precision Spectroscopy ◽  
Optical Frequency Combs ◽  
Frequency Combs

Optical frequency combs—coherent light sources that connect optical frequencies with microwave oscillations—have become the enabling tool for precision spectroscopy, optical clockwork, and attosecond physics over the past decades. Current benchmark systems are self-referenced femtosecond mode-locked lasers, but Kerr nonlinear dynamics in high-Q solid-state microresonators has recently demonstrated promising features as alternative platforms. The advance not only fosters studies of chip-scale frequency metrology but also extends the realm of optical frequency combs. We report the full stabilization of chip-scale optical frequency combs. The microcomb’s two degrees of freedom, one of the comb lines and the native 18-GHz comb spacing, are simultaneously phase-locked to known optical and microwave references. Active comb spacing stabilization improves long-term stability by six orders of magnitude, reaching a record instrument-limited residual instability of 3.6mHz/τ. Comparing 46 nitride frequency comb lines with a fiber laser frequency comb, we demonstrate the unprecedented microcomb tooth-to-tooth relative frequency uncertainty down to 50 mHz and 2.7 × 10−16, heralding novel solid-state applications in precision spectroscopy, coherent communications, and astronomical spectrography.

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