Optical distance measuring method using fast frequency noise characteristics of a laser diode

Daiki Kawakami; Masamichi Suzuki; Ryotaro Kimura; Takashi Sato; Takahiro Saito; Masashi Ohkawa; Yasuo Ohdaira; Shuichi Sakamoto

doi:10.1117/12.2288086

23 February 2018 Optical distance measuring method using fast frequency noise characteristics of a laser diode

Daiki Kawakami, Masamichi Suzuki, Ryotaro Kimura, Takashi Sato, Takahiro Saito, Masashi Ohkawa, Yasuo Ohdaira, Shuichi Sakamoto

Author Affiliations +

Proceedings Volume 10526, Physics and Simulation of Optoelectronic Devices XXVI; 105260W (2018) https://doi.org/10.1117/12.2288086
Event: SPIE OPTO, 2018, San Francisco, California, United States

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.

Citation Download Citation

Daiki Kawakami, Masamichi Suzuki, Ryotaro Kimura, Takashi Sato, Takahiro Saito, Masashi Ohkawa, Yasuo Ohdaira, and Shuichi Sakamoto "Optical distance measuring method using fast frequency noise characteristics of a laser diode", Proc. SPIE 10526, Physics and Simulation of Optoelectronic Devices XXVI, 105260W (23 February 2018); https://doi.org/10.1117/12.2288086

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