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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 11 — May. 23, 2011
  • pp: 10931–10939

GI-core polymer parallel optical waveguide with high-loss, carbon-black-doped cladding for extra low inter-channel crosstalk

Hisashi Uno and Takaaki Ishigure  »View Author Affiliations

Optics Express, Vol. 19, Issue 11, pp. 10931-10939 (2011)

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Graded-index (GI) polymer parallel optical waveguides with high-absorption, carbon-black-doped cladding are fabricated using the preform method in order to reduce the inter-channel crosstalk. The waveguides exhibit a lower inter-channel crosstalk (<-69.3dB) than optically-transparent-clad waveguides (~-33.7 dB) and maintain low propagation loss (0.029dB/cm). We characterize the waveguides with different concentration of carbon black in order to confirm the required concentration (required absorption loss) for keeping the inter-channel crosstalk low enough. In addition, carbon-black-doped waveguides are fabricated directly on a substrate by means of a soft-lithography method. Crosstalk is sufficiently decreased despite the high scattering loss of the core material, while insertion loss is not increased. Furthermore, we fabricate a waveguide with a high-scattering-loss cladding to confirm the origin of low crosstalk in carbon-black-doped waveguides. We confirm that high scattering loss of cladding is not necessarily as effective for crosstalk reduction as high absorption loss of cladding.

© 2011 OSA

OCIS Codes
(060.2280) Fiber optics and optical communications : Fiber design and fabrication
(200.4650) Optics in computing : Optical interconnects
(230.7370) Optical devices : Waveguides
(250.5460) Optoelectronics : Polymer waveguides

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: February 17, 2011
Revised Manuscript: May 18, 2011
Manuscript Accepted: May 19, 2011
Published: May 20, 2011

Hisashi Uno and Takaaki Ishigure, "GI-core polymer parallel optical waveguide with high-loss, carbon-black-doped cladding for extra low inter-channel crosstalk," Opt. Express 19, 10931-10939 (2011)

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