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Sensors 2015, 15(7), 16153-16161; doi:10.3390/s150716153

A Time Difference Method for Measurement of Phase Shift between Distributed Feedback Laser Diode (DFB-LD) Output Wavelength and Intensity

School of Information Science and Engineering, Shandong University, Jinan 250100, China
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Academic Editor: Vittorio M.N. Passaro
Received: 21 April 2015 / Revised: 25 June 2015 / Accepted: 29 June 2015 / Published: 6 July 2015
(This article belongs to the Special Issue Optical Sensors for Chemical, Biological and Industrial Applications)
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Abstract

A time difference method to conveniently measure the phase shift between output wavelength and intensity of distributed feedback laser diodes (DFB-LDs) was proposed. This approach takes advantage of asymmetric absorption positions at the same wavelength during wavelength increase and decrease tuning processes in the intensity-time curve by current modulation. For its practical implementation, a measurement example of phase shift was demonstrated by measuring a time difference between the first time and the second time attendances of the same gas absorption line in the intensity-time curve during one sine or triangle modulation circle. The phase shifts at modulation frequencies ranging from 50 Hz to 50 kHz were measured with a resolution of 0.001π. As the modulation frequency increased the shift value increased with a slowed growth rate. View Full-Text
Keywords: phase shift; DFB-LD; infrared spectroscopy; fiber optics sensors phase shift; DFB-LD; infrared spectroscopy; fiber optics sensors
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Liu, Y.; Chang, J.; Lian, J.; Liu, Z.; Wang, Q.; Zhu, C. A Time Difference Method for Measurement of Phase Shift between Distributed Feedback Laser Diode (DFB-LD) Output Wavelength and Intensity. Sensors 2015, 15, 16153-16161.

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