Broadband Direct RF Digitization Receivers

Jamin, Olivier

doi:10.1007/978-3-319-01150-9

Cited by 9 publications

(2 citation statements)

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“…We use a polarimetric detection system where the polarization fluctuation of the probe laser beam is detected in a balanced photodetector [9]. The power spectrum of the polarization fluctuation (second order correlation function -g (2) ) gives the information about the spectral properties of the atomic spin ensemble. In a typical experimental conditions we apply a uniform magnetic field perpendicular to the propagation direction of the probe beam.…”

Section: A Spectroscopy Techniquementioning

confidence: 99%

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A real time digital receiver for correlation measurements in atomic systems

Mugundhan,

Swar,

Bhar

et al. 2021

Preprint

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We present the development and characterization of a generic, reconfigurable, low-cost (< 350 USD) software-defined digital receiver system (DRS) for temporal correlation measurements in atomic spin ensembles. We demonstrate the use of the DRS as a component of a high resolution magnetometer. Digital receiver based fast Fourier transform spectrometers (FFTS) are generally superior in performance in terms of signal-to-noise ratio (SNR) compared to traditional swept-frequency spectrum analyzers (SFSA). In applications where the signals being analyzed are very narrow band in frequency domain, recording them at high speeds over a reduced bandwidth provides flexibility to study them for longer periods. We have built the DRS on the STEMLab 125-14 FPGA platform and it has two different modes of operation: FFT Spectrometer and real time raw voltage recording mode. We evaluate its performance by using it in atomic spin noise spectroscopy (SNS). We demonstrate that the SNR is improved by more than one order of magnitude with the FFTS as compared to that of the commercial SFSA. We also highlight that with this DRS operating in the triggered data acquisition mode one can achieve spin noise (SN) signal with high SNR in a recording time window as low as 100 msec. We make use of this feature to perform time resolved high-resolution magnetometry. While the receiver was initially developed for SNS experiments, it can be easily used for other atomic, molecular and optical (AMO) physics experiments as well.

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Section: A Spectroscopy Techniquementioning

confidence: 99%

“…However, digital systems have quantization noise, sampling rate and phase noise which can be minimized by choosing high bit-width ADCs and low drift clock sources. These characteristics make digital receivers an attractive option in applications where precision measurements are required [1], [2]. AMO experiments are one such example.…”

Section: Introductionmentioning

confidence: 99%