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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 46, Iss. 17 — Jun. 10, 2007
  • pp: 3572–3578

Specklegram in a multiple-mode fiber and its dependence on longitudinal modes of the laser source

Jun Li, Haiwen Cai, Jianxin Geng, Ronghui Qu, and Zujie Fang  »View Author Affiliations

Applied Optics, Vol. 46, Issue 17, pp. 3572-3578 (2007)

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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

Original Manuscript: September 14, 2006
Revised Manuscript: December 27, 2006
Manuscript Accepted: February 1, 2007
Published: May 18, 2007

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)

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