Precise Identification of Wideband Multiple Microwave Frequency Based on Self-Heterodyne Low-Coherence Interferometry
Sign Up to like & getrecommendations! Published in 2021 at "Journal of Lightwave Technology"
DOI: 10.1109/jlt.2021.3064866
Abstract: Frequency estimation of microwave signals is a crucial functionality for applications ranging from biomedical engineering to electronic warfare systems. Photonics-based frequency measurement systems offer advantages of flexible reconfigurability and wide bandwidth compard to electronic methods.… read more here.
Keywords: coherence interferometry; low coherence; frequency; identification ... See more keywords
New Approach to Laser Characterization Using Delayed Self-Heterodyne Interferometry
Sign Up to like & getrecommendations! Published in 2021 at "Journal of Lightwave Technology"
DOI: 10.1109/jlt.2021.3082263
Abstract: A new technique to measure phase noise properties of highly coherent lasers based on delayed self-heterodyne interferometer (DSHI) is suggested where the Allan variance of the beat note frequency is obtained via digital signal processing… read more here.
Keywords: phase noise; new approach; laser; noise ... See more keywords
Performance enhancement for a self-heterodyne detection Brillouin optical time-domain reflectometer
Sign Up to like & getrecommendations! Published in 2020 at "Optical Engineering"
DOI: 10.1117/1.oe.59.3.034103
Abstract: Abstract. Aiming at improving signal-to-noise ratio (SNR) and system performance for a Brillouin optical time-domain reflectometer (BOTDR) based on self-heterodyne detection of Rayleigh and Brillouin scattering lights, an approach assisted by modulating probe light and… read more here.
Keywords: time; brillouin optical; heterodyne detection; performance ... See more keywords
Narrow laser-linewidth measurement using short delay self-heterodyne interferometry.
Sign Up to like & getrecommendations! Published in 2022 at "Optics express"
DOI: 10.1364/oe.455028
Abstract: Delayed self-heterodyne interferometry is a commonly used technique for the measurement of laser linewidth. It typically requires the use of a very long delay fiber when measuring narrow linewidth (especially linewidths in the kHz-range) lasers.… read more here.
Keywords: laser linewidth; heterodyne interferometry; delay; self heterodyne ... See more keywords
Sensitive mid-infrared photothermal gas detection enhanced by self-heterodyne harmonic amplification of a mode-locked fiber laser probe.
Sign Up to like & getrecommendations! Published in 2022 at "Optics express"
DOI: 10.1364/oe.465323
Abstract: In this work, a method of photothermal spectroscopic signal extraction is presented. The refractive index modulation readout is realized in a purely frequency detection-based approach, by demodulating the beatnotes of a mode-locked fiber laser operating… read more here.
Keywords: laser; fiber laser; mode locked; locked fiber ... See more keywords
Accurate evaluation of self-heterodyne laser linewidth measurements using Wiener filters.
Sign Up to like & getrecommendations! Published in 2023 at "Optics express"
DOI: 10.1364/oe.485866
Abstract: Self-heterodyne beat note measurements are widely used for the experimental characterization of the frequency noise power spectral density (FN-PSD) and the spectral linewidth of lasers. The measured data, however, must be corrected for the transfer… read more here.
Keywords: laser linewidth; noise; laser; self heterodyne ... See more keywords
The Influence of Noise Floor on the Measurement of Laser Linewidth Using Short-Delay-Length Self-Heterodyne/Homodyne Techniques
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DOI: 10.3390/mi13081311
Abstract: Delayed self-heterodyne/homodyne measurements based on an unbalanced interferometer are the most used methods for measuring the linewidth of narrow-linewidth lasers. They typically require the service of a delay of six times (or greater) than the… read more here.
Keywords: laser; linewidth; heterodyne homodyne; self heterodyne ... See more keywords
Imaging process and signal-to-noise ratio improvement of enhanced self-heterodyne synthetic aperture imaging ladar
Sign Up to like & getrecommendations! Published in 2017 at "Chinese Optics Letters"
DOI: 10.3788/col201715.102801
Abstract: This Letter gives the general construction of an enhanced self-heterodyne synthetic aperture imaging ladar (SAIL) system, and proposes the principle of image processing. A point target is reconstructed in the enhanced self-heterodyne SAIL as well… read more here.
Keywords: enhanced self; aperture imaging; sail; self heterodyne ... See more keywords