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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 25,
  • Issue 2,
  • pp. 539-543
  • (2007)

Wavelength Sensing With Subpicometer Resolution Using Ultrahigh Order Modes

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Abstract

The ultrahigh order modes of a symmetrical metal-cladding optical waveguide, which exhibit strong wavelength dispersion characteristics, are used to track small wavelength changes of the light output of laser diodes. In the case of free-space coupling, the wavelength shift is transformed into an intensity variation of the light reflected on a surface of the waveguide. The sensitivity considering the divergence of the incident light and the thickness of the upper cladding is analyzed. A wavelength resolution of 0.5 pm at a center wavelength of 859.8 nm is demonstrated experimentally.

© 2007 IEEE

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