Specklegram in a multiple-mode fiber and its dependence on longitudinal modes of the laser source
Applied Optics, Vol. 46, Issue 17, pp. 3572-3578 (2007)
http://dx.doi.org/10.1364/AO.46.003572
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Abstract
A specklegram in a multimode fiber (MMF) has successfully been used as a sensor for detecting external disturbance. Our experiments showed that the sensitivity in the sensor with a multiple longitudinal-mode laser as its source was much higher than that with a single longitudinal-mode laser. In addition, the near-field pattern observations indicated that the coupling between different transverse modes in the MMF is quite weak. Based on the experimental results, a theoretical model for the speckle formation is proposed, taking a bend-caused phase factor into consideration. It is shown in the theoretical analysis that the interferences between different longitudinal modes make a larger contribution to the specklegram signals.
© 2007 Optical Society of America
OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(060.2380) Fiber optics and optical communications : Fiber optics sources and detectors
(140.3510) Lasers and laser optics : Lasers, fiber
ToC Category:
Fiber Optics and Optical Communications
History
Original Manuscript: September 14, 2006
Revised Manuscript: December 27, 2006
Manuscript Accepted: February 1, 2007
Published: May 18, 2007
Citation
Jun Li, Haiwen Cai, Jianxin Geng, Ronghui Qu, and Zujie Fang, "Specklegram in a multiple-mode fiber and its dependence on longitudinal modes of the laser source," Appl. Opt. 46, 3572-3578 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-17-3572
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