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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