Widely tunable optical bandpass filter by use of polymer long-period waveguide gratings |
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Authors: | Chu Yiu Man Chiang Kin Seng Liu Qing |
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Affiliation: | Optoelectronics Research Centre, Department of Electronic Engineering, City University of Hong Kong, Hong Kong SAR, China. |
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Abstract: | We report the design and fabrication of a widely tunable optical bandpass filter based on using two identical long-period gratings formed along a polymer channel waveguide with a section of the waveguide core removed. The peak transmission of the passband of the fabricated filter is approximately 60% and the bandwidth of the passband is approximately 6 nm. The filter is thermally tunable over the C + L band (1520-1610 nm) for both TE and TM polarizations with a temperature control of approximately 30 degrees C. |
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