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Journal of the Optical Society of Korea

Journal of the Optical Society of Korea


  • Vol. 12, Iss. 3 — Sep. 25, 2008
  • pp: 126–130

Speckle Reduction in Near-field Image of Multimode Fiber with a Piezoelectric Transducer

Woo-Sung Ha, Se-Jin Lee, Kyung-Hwan Oh, Yong-Min Jung, and Jun-Ki Kim  »View Author Affiliations

Journal of the Optical Society of Korea, Vol. 12, Issue 3, pp. 126-130 (2008)

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We propose and experimentally demonstrate an effective method to reduce near-field speckle noise at the output of a 50 <TEX>${\mu}m$</TEX> graded index multimode fiber using a short cylindrical piezoelectric transducer(PZT) vibrating in the radial direction. The fiber was coiled as tightly as possible around the mandrel of the PZT and a periodic stretching effect was caused by the radial oscillations of the actuator. The output of the optical fiber using the He-Ne laser source was intensively observed by a CCD camera. By counting all the pixels corresponding to relative intensity graded into 256 levels in the selected area and by calculating standard deviation and mean value of the intensity, we could measure the speckle contrast and vibration effect quantitatively with reduction ratio of pixels and line profile of the illuminated region. It was clearly observed that the characteristics of the speckle pattern in the vibration-on state were significantly improved over that of the vibration-off state due to time-averaged smoothing.

© 2008 Optical Society of Korea

OCIS Codes
(060.2310) Fiber optics and optical communications : Fiber optics
(100.1160) Image processing : Analog optical image processing
(110.1650) Imaging systems : Coherence imaging
(110.2350) Imaging systems : Fiber optics imaging
(110.6150) Imaging systems : Speckle imaging

Original Manuscript: August 1, 2008
Revised Manuscript: September 10, 2008
Manuscript Accepted: September 12, 2008
Published: September 25, 2008

Woo-Sung Ha, Se-Jin Lee, Kyung-Hwan Oh, Yong-Min Jung, and Jun-Ki Kim, "Speckle Reduction in Near-field Image of Multimode Fiber with a Piezoelectric Transducer," J. Opt. Soc. Korea 12, 126-130 (2008)

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