Speckle feedback-injected erbium-doped fiber ring laser for velocity detecting

Daofu Han; Ming Wang; Junping Zhou

doi:10.1117/12.726606

5 March 2007 Speckle feedback-injected erbium-doped fiber ring laser for velocity detecting

Daofu Han, Ming Wang, Junping Zhou

Proceedings Volume 6595, Fundamental Problems of Optoelectronics and Microelectronics III; 659540 (2007) https://doi.org/10.1117/12.726606
Event: Fundamental Problems of Optoelectronics and Microelectronics III, 2006, Harbin, China

Abstract

A new approach for velocity detecting based on laser speckle feedback injected erbium-doped fiber (EDF) ring laser is presented in this paper. 1550nm wavelength light is outgone through an optical fiber and shoots onto a moving object by a lens. Portion of the light scattered from the object produces dynamic speckle, when it is back-coupled into the same fiber and injects the EDF ring laser, random intensity feedback causes changes of both intensity and frequency of the laser. We theoretically analyzed the laser output when speckle feedback injects an EDF ring laser by using model of the injection-seeded EDF ring laser, and experimentally obtained the dynamic speckle-modulated laser output signal by a photodiode (PD). The signal is analyzed by way of FFT analysis, and the mean speckle frequency (MSF), which is defined as the ratio of number of fluctuations in the detected signal to the measurement time, is obtained. We studied the relationship between the velocities and MSFs by changing the velocity of object, thus a linear dependent relationship between them is obtained, which indicates that speckle feedback injected EDF ring laser is an effective approach for velocity detecting, it is promising to develop a new generation of optical fiber active sensor.

Citation Download Citation

Daofu Han, Ming Wang, and Junping Zhou "Speckle feedback-injected erbium-doped fiber ring laser for velocity detecting", Proc. SPIE 6595, Fundamental Problems of Optoelectronics and Microelectronics III, 659540 (5 March 2007); https://doi.org/10.1117/12.726606

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