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Optical Engineering

High-accuracy angle detection for ultra-wide-field-of-view acquisition in wireless optical links
Author(s): Xiaozheng Song; Lu Liu; JunXiong Tang
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Paper Abstract

A novel scheme to deploy a point-to-multipoint optical wireless communication network is proposed. The master node provides hemispherical field-of-view (FOV) acquisition via a fisheye lens to achieve the automatic establishment of optical links with user nodes. We present an effective distortion-correcting algorithm based on two-ary piecewise bicubic spline interpolation to correct the large optical distortions of the fisheye lens. Using this algorithm, the angles of the incident beams are accurately calculated according to the laser spot position on the CCD (charge-coupled device) sensor with the maximum error of 0.027 deg. In addition, the strong background radiation from such an ultrawide FOV also leads to significant degradation of the angle detection accuracy under the condition of weak received optical power. A Voigt anomalous dispersion optical filter with ultra-narrow-pass bandwidth is adopted to resist the background radiation. The numerical simulation results show that the total angle detection error caused by the optical distortion and the background radiation is within 0.06 deg. Considering the extra gimbal pointing error and the angle-of-arrival fluctuations due to atmospheric turbulence, the pointing error of the master node is less than 0.079 deg, which meets the high-accuracy requirement of pointing for the automatic optical link establishment.

Paper Details

Date Published: 1 February 2008
PDF: 8 pages
Opt. Eng. 47(2) 025010 doi: 10.1117/1.2844697
Published in: Optical Engineering Volume 47, Issue 2
Show Author Affiliations
Xiaozheng Song, Peking Univ. (China)
Lu Liu, Peking Univ. (China)
JunXiong Tang, Peking Univ. (China)

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