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Conferences > CLEO > 1996 > CThK > CThK55
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1996),
  • paper CThK55

Optical absolute distance measurement using a trapezoidally modulated laser diode

Ci-Ling Pan, Yung-Hui Chuang, and Pie-Yau Chien

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Abstract

We demonstrate a new type of two-wavelength interferometer for absolute distance measurement without phase ambiguity. For signal processing, we combine the advantages of triangular- and squaremodulation techniques. The experimental arrangement is shown in Fig. 1. A single-mode laser diode (HLP1400, λ = 821.6 nm) operating at 75 mA and 20 ± 0.01 °C was employed. It was modulated with a trapezoidal current waveform.

© 1996 Optical Society of America

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