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High-sensitivity detection of narrowband light in a more intense broadband background using coherence interferogram phase

Coutinho, RC; Selviah, DR; Griffiths, HD; (2006) High-sensitivity detection of narrowband light in a more intense broadband background using coherence interferogram phase. J LIGHTWAVE TECHNOL , 24 (10) 3654 - 3662. 10.1109/JLT.2006.881851. Green open access

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Abstract

This paper describes an optical interferometric detection technique,. known as the interferogram phase step shift, which detects narrowband, coherent, and partially coherent light in more intense broadband incoherent background light using changes in the phase gradient with the optical path difference of the coherence interferograin to distinguish the bandwidth or coherence of the signal from that of the background. The detection sensitivity is assessed experimentally by measuring the smallest signal-to-background ratio or signal-to-clutter ratio (SCR), which causes a detectable change in the self-coherence interferograin phase. This minimum detectable SCR (MDSCR) is measured for the multimode He-Ne laser, resonant-cavity light-emitting diode (LED), narrowband-filtered white light, and LED signal sources in a more intense tungsten-halogen-lamp white-light background. The highest MDSCRs to date, to the authors' knowledge, are -46.42 dB for coherent light and -31.96 dB for partially coherent light, which exceed those of existing automatic single-domain techniques by 18.97 and 4.51 dB with system input dynamic ranges of 19.24 and 11.39 dB, respectively. The sensitivity dependence on the signal-to-system bandwidth ratio and on the relative offset of their central wavelengths is also assessed, and optimum values are identified.

Type: Article
Title: High-sensitivity detection of narrowband light in a more intense broadband background using coherence interferogram phase
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/JLT.2006.881851
Keywords: correlators, envelope detection, gas detectors, homodyne detection, missile detection and tracking, object detection, optical signal detection, phase detection, photodetectors, SENSOR
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/2621
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