scholarly journals Estimation of the Laser Frequency Noise Spectrum by Continuous Dynamical Decoupling

2021 ◽  
Vol 15 (1) ◽  
Author(s):  
Manchao Zhang ◽  
Yi Xie ◽  
Jie Zhang ◽  
Weichen Wang ◽  
Chunwang Wu ◽  
...  
Keyword(s):  
Noise Spectrum ◽  
Laser Frequency ◽  
Frequency Noise ◽  
Dynamical Decoupling

scholarly journals Dynamical decoupling of laser phase noise in compound atomic clocks

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Sören Dörscher ◽  
Ali Al-Masoudi ◽  
Marcin Bober ◽  
Roman Schwarz ◽  
Richard Hobson ◽  
...  
Keyword(s):  
Phase Noise ◽  
Phase Measurement ◽  
Local Oscillator ◽  
Frequency Instability ◽  
Laser Frequency ◽  
High Signal ◽  
Frequency Noise ◽  
Atomic Clocks ◽  
Dynamical Decoupling ◽  
Measurement Protocol

Abstract The frequency stability of many optical atomic clocks is limited by the coherence of their local oscillator. Here, we present a measurement protocol that overcomes the laser coherence limit. It relies on engineered dynamical decoupling of laser phase noise and near-synchronous interrogation of two clocks. One clock coarsely tracks the laser phase using dynamical decoupling; the other refines this estimate using a high-resolution phase measurement. While the former needs to have a high signal-to-noise ratio, the latter clock may operate with any number of particles. The protocol effectively enables minute-long Ramsey interrogation for coherence times of few seconds as provided by the current best ultrastable laser systems. We demonstrate implementation of the protocol in a realistic proof-of-principle experiment, where we interrogate for 0.5 s at a laser coherence time of 77 ms. Here, a single lattice clock is used to emulate synchronous interrogation of two separate clocks in the presence of artificial laser frequency noise. We discuss the frequency instability of a single-ion clock that would result from using the protocol for stabilisation, under these conditions and for minute-long interrogation, and find expected instabilities of σy(τ) = 8 × 10−16(τ/s)−1/2 and σy(τ) = 5 × 10−17(τ/s)−1/2, respectively.

scholarly journals Dynamic frequency-noise spectrum measurement for a frequency-swept DFB laser with short-delayed self-heterodyne method

2015 ◽  
Vol 23 (22) ◽  
pp. 29245 ◽  
Author(s):  
Qian Zhou ◽  
Jie Qin ◽  
Weilin Xie ◽  
Zhangweiyi Liu ◽  
Yitian Tong ◽  
...  
Keyword(s):  
Noise Spectrum ◽  
Frequency Noise ◽  
Heterodyne Method ◽  
Spectrum Measurement ◽  
Dfb Laser ◽  
Dynamic Frequency

scholarly journals Impact of laser frequency noise on high-extinction optical modulation

2020 ◽  
Vol 28 (26) ◽  
pp. 39606
Author(s):  
Gavin N. West ◽  
William Loh ◽  
Dave Kharas ◽  
Rajeev J. Ram
Keyword(s):  
Laser Frequency ◽  
Optical Modulation ◽  
Frequency Noise

Laser frequency noise immunity in multiplexed displacement sensing

2011 ◽  
Vol 36 (5) ◽  
pp. 672 ◽  
Author(s):  
Danielle M. R. Wuchenich ◽  
Timothy T.-Y. Lam ◽  
Jong H. Chow ◽  
David E. McClelland ◽  
Daniel A. Shaddock
Keyword(s):  
Noise Immunity ◽  
Laser Frequency ◽  
Frequency Noise

scholarly journals Numerical and experimental analyses of intake silencer and its effects on turbocharger compressor performance

2019 ◽  
Vol 11 (3) ◽  
pp. 168781401982667 ◽  
Author(s):  
Chen Liu ◽  
Yipeng Cao ◽  
Yang Liu ◽  
Wenping Zhang ◽  
Pingjian Ming ◽  
...  
Keyword(s):  
Noise Reduction ◽  
Transmission Loss ◽  
Pressure Ratio ◽  
Pressure Fluctuations ◽  
Noise Spectrum ◽  
Acoustic Mode ◽  
Frequency Noise ◽  
Reduced Pressure ◽  
Compressor Rotor ◽  
Compressor Performance

Numerical studies of a marine diesel engine intake silencer are conducted to evaluate its performance, and effects of the silencer on the turbocharger compressor performance are also discussed. The results show that the duct acoustic mode method can be used in the silencer transmission loss prediction, and the predicted noise reduction and main frequency range agree with the measurements fairly well. However, it is found that the silencer compromises the compressor performance by shortening its operating range. It is found that the static pressure on the compressor blade surface is decreased, thus the compressor total-to-total pressure ratio and isentropic efficiency are reduced. Pressure fluctuations at compressor rotor and stator inlets enhanced when a silencer is installed, which means the trend of pressure spectrum in the rotor and stator passage is changed. Compared with the results of a compressor in natural aspiration, it is found that the silencer can significantly reduce high-frequency noise. In particular, it is quite effective in tonal noise reduction. In addition, the compressor inlet noise spectrum indicates that noise radiation characteristics are different with a silencer installed.

Carrier Recovery Techniques for Semiconductor Laser Frequency Noise for 28 Gbd DP-16QAM

2015 ◽  
Author(s):  
Miguel Iglesias Olmedo ◽  
Xiaodan Pang ◽  
Molly Piels ◽  
Richard Schatz ◽  
Gunnar Jacobsen ◽  
...  
Keyword(s):  
Semiconductor Laser ◽  
Laser Frequency ◽  
Frequency Noise ◽  
Carrier Recovery ◽  
Recovery Techniques
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