Widely tunable long-period gratings fabricated in polymer-clad ion-exchanged glass waveguides

  title={Widely tunable long-period gratings fabricated in polymer-clad ion-exchanged glass waveguides},
  author={K. S. Chiang and K. P. Lor and C K Chow and H. P. Chan and Vipul Rastogi and Y. M. Chu},
  journal={IEEE Photonics Technology Letters},
Long-period-grating filters were fabricated in polymer-clad ion-exchanged BK7 glass waveguides. The transmission spectra of the filters exhibited strong polarization dependence. A contrast as high as 25 dB at the resonance wavelength was obtained. The temperature sensitivity of the filters was measured to be /spl sim/9.0 nm//spl deg/C, which allows potential wavelength tuning over the entire S+C+L band of /spl sim/180 nm with a temperature control over a range of /spl sim/20/spl deg/C. 
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