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Optica Publishing Group
  • Journal of the Optical Society of Korea
  • Vol. 8,
  • Issue 1,
  • pp. 17-20
  • (2004)

In-line Variable Attenuator Based on the Evanescent Wave Coupling Between a Side-polished Single-mode Fiber and an Index Matched Dielectric Plate

Open Access Open Access

Abstract

An in-line variable attenuator has been proposed and demonstrated exploiting a side-polished single-mode (SM) fiber evanescently coupled with an index matched dielectric plate. The attenuation can be controlled by fine mechanical sliding of the index matched dielectric plate. We have achieved 49 ㏈ dynamic range and very low excess loss of 0.2 ㏈ at 1550 nm wavelength. The measured polarization dependent losses (PDL) were 0.1, 0.2, and 0.4 ㏈ at 10, 20, and 30 ㏈ attenuation, respectively. Wavelength sensitivity was measured to be -0.017/nm ㏈ at 20 ㏈ attenuation.

© 2004 Optical Society of Korea

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