Abstract
A tunable wavelength filters with Bragg grating are fabricated on a flexible substrate by using a post lift-off process along with an absorbing layer in order to provide highly uniformity of Bragg grating patterns. When the Bragg grating is fabricated on a flexible substrate, the highly elastic property of polymer is favorable to obtain much wider tuning range than the silica fiber. The flexible Bragg reflector shows narrow bandwidth, which is convincing the uniform grating structure fabricated on plastic film. By stretching the flexible polymer device, the Bragg reflection wavelength is tuned continuously up to 45 nm for the maximum strain of 31,690 μe which is determined by the elastic expansion limit of waveguide polymer. From the linear wavelength shift proportional to the strain, the photoelastic coefficient of the ZPU polymer is found.
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