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Chirp-pulse-compression three-dimensional lidar imager with fiber optics

Pearson, GN, Ridley, KD and Willetts, DV 2005, 'Chirp-pulse-compression three-dimensional lidar imager with fiber optics ' , Applied Optics, 44 (2) , pp. 257-265.

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Abstract

A coherent three-dimensional (angle-angle-range) lidar imager using a master-oscillator-power-amplifier concept and operating at a wavelength of 1.5 μm with chirp-pulse compression is described. A fiber-optic delay line in the local oscillator path enables a single continuous-wave semiconductor laser source with a modulated drive waveform to generate both the constant-frequency local oscillator and the frequency chirp. A portion of this chirp is gated out and amplified by a two-stage fiber amplifier. The digitized return signal was compressed by cross correlating it with a sample of the outgoing pulse. In this way a 350-ns, 10-μJ pulse with a 250-MHz frequency sweep is compressed to a width of approximately 8 ns. With a 25-mm output aperture, the lidar has been used to produce three-dimensional images of hard targets out to a range of approximately 2 km with near-diffraction-limited angular resolution and submeter range resolution.

Item Type: Article
Themes: Subjects / Themes > T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101 Telecommunication (Inc. www, lidar, radio, radar, phone, TV)
Subjects outside of the University Themes
Schools: Colleges and Schools > College of Science & Technology > School of the Built Environment
Journal or Publication Title: Applied Optics
Publisher: Optical Society of America
Refereed: Yes
ISSN: 0003-6935
Depositing User: H Kenna
Date Deposited: 09 Oct 2007 15:32
Last Modified: 20 Aug 2013 16:50
URI: http://usir.salford.ac.uk/id/eprint/760

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