## Abstract

A simple thermal tuning wavelength filter is experimentally demonstrated by using a high polarization extinction ratio polymer waveguide and a polarization-maintaining fiber. This filter can be tuned with its free spectral range, on/off ratio, and filtered wavelength. The large temperature dependence wavelength shift of $0.65\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{nm}/\xb0\mathrm{C}$ also makes it a suitable candidate of thermal sensors.

© 2012 Optical Society of America

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### Equations (1)

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(1)
$$I={\mathrm{cos}}^{2}{\theta}_{1}\text{\hspace{0.17em}}{\mathrm{cos}}^{2}\text{\hspace{0.17em}}{\text{\hspace{0.17em}}\theta}_{2}+{\mathrm{sin}}^{2}\text{\hspace{0.17em}}{\theta}_{1}\text{\hspace{0.17em}}{\mathrm{sin}}^{2}\text{\hspace{0.17em}}{\theta}_{2}+\frac{1}{2}\mathrm{sin}\text{\hspace{0.17em}}2{\theta}_{1}\text{\hspace{0.17em}}\mathrm{sin}\text{\hspace{0.17em}}2{\theta}_{2}\text{\hspace{0.17em}}\mathrm{cos}\left(\frac{2\pi L\mathrm{\Delta}n}{\lambda}\right),$$