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Band-rejection filter with widely tunable center wavelength and contrast using metal long-period grating on polymer waveguide

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5 Author(s)
Kin Seng Chiang ; Dept. of Electron. Eng., City Univ. of Hong Kong, China ; Chow, C.K. ; Qing Liu ; Hau Ping Chan
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We demonstrate a widely tunable band-rejection filter using a metal long-period grating deposited directly on the cladding of a polymer waveguide. The contrast of the rejection band can be tuned by 28 dB with ∼45-mW electric power applied to the metal grating and the center wavelength can be tuned over the C+L-band with a temperature control of ∼40°C. The device can find applications as a tunable notch filter, a polarization-dependent loss compensator, or a variable attenuator.

Published in:

Photonics Technology Letters, IEEE  (Volume:18 ,  Issue: 9 )