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Proceedings Paper

Optical distance measuring method using fast frequency noise characteristics of a laser diode
Author(s): Daiki Kawakami; Masamichi Suzuki; Ryotaro Kimura; Takashi Sato; Takahiro Saito; Masashi Ohkawa; Yasuo Ohdaira; Shuichi Sakamoto
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Paper Abstract

While standard laser range finders use modulation signals, such as sharp pulses, the method we devised employs laser diode's frequency noise, and a frequency discriminator, to produce the intensity noise signal, which we use to generate fast physical random numbers. Observed through a frequency discriminator, beams traveling along two different paths share intensity noise patterns, i.e., the same fast physical random numbers, but with a time lag. We compared the two, and calculated their cross-correlation. By sweeping their time lags, we confirmed the length of the two optical paths, up to 50m.

Paper Details

Date Published: 23 February 2018
PDF: 8 pages
Proc. SPIE 10526, Physics and Simulation of Optoelectronic Devices XXVI, 105260W (23 February 2018);
Show Author Affiliations
Daiki Kawakami, Niigata Univ. (Japan)
Masamichi Suzuki, Niigata Univ. (Japan)
Ryotaro Kimura, Niigata Univ. (Japan)
Takashi Sato, Niigata Univ. (Japan)
Takahiro Saito, Niigata Univ. (Japan)
Masashi Ohkawa, Niigata Univ. (Japan)
Yasuo Ohdaira, Niigata Univ. (Japan)
Shuichi Sakamoto, Niigata Univ. (Japan)

Published in SPIE Proceedings Vol. 10526:
Physics and Simulation of Optoelectronic Devices XXVI
Bernd Witzigmann; Marek Osiński; Yasuhiko Arakawa, Editor(s)

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