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Speckle reduction in near-field image of multimode fiber with a piezoelectric transducer

Speckle reduction in near-field image of multimode fiber with a piezoelectric transducer
Speckle reduction in near-field image of multimode fiber with a piezoelectric transducer
We propose and experimentally demonstrate an effective method to reduce near-field speckle noise at the output of a 50 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.
1226-4776
126-130
Ha, Woo-Sung
44e39a91-3fe0-42c4-a0ef-d4744295749e
Lee, Se-Jin
4e7a3c1b-3d19-4beb-8af5-fcd8e7d77614
Oh, Kyung-Hwan
94ce1bc0-e0a8-46e8-85c7-97db55789304
Jung, Yongmin
6685e51e-be47-4c96-8c4b-65aee3b5126d
Kim, Jun-Ki
fa33ac72-9648-4eec-99f3-364326a7af68
Ha, Woo-Sung
44e39a91-3fe0-42c4-a0ef-d4744295749e
Lee, Se-Jin
4e7a3c1b-3d19-4beb-8af5-fcd8e7d77614
Oh, Kyung-Hwan
94ce1bc0-e0a8-46e8-85c7-97db55789304
Jung, Yongmin
6685e51e-be47-4c96-8c4b-65aee3b5126d
Kim, Jun-Ki
fa33ac72-9648-4eec-99f3-364326a7af68

Ha, Woo-Sung, Lee, Se-Jin, Oh, Kyung-Hwan, Jung, Yongmin and Kim, Jun-Ki (2008) Speckle reduction in near-field image of multimode fiber with a piezoelectric transducer. Journal of the Optical Society of Korea, 12 (3), 126-130. (doi:10.3807/JOSK.2008.12.3.126).

Record type: Article

Abstract

We propose and experimentally demonstrate an effective method to reduce near-field speckle noise at the output of a 50 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.

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Published date: 2008
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 357262
URI: http://eprints.soton.ac.uk/id/eprint/357262
ISSN: 1226-4776
PURE UUID: c2fafa0b-867a-47a8-a9d9-5fcb30fd2400
ORCID for Yongmin Jung: ORCID iD orcid.org/0000-0002-9054-4372

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Date deposited: 27 Sep 2013 15:38
Last modified: 28 Apr 2022 02:00

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Contributors

Author: Woo-Sung Ha
Author: Se-Jin Lee
Author: Kyung-Hwan Oh
Author: Yongmin Jung ORCID iD
Author: Jun-Ki Kim

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