title: Widely tunable optical bandpass filter by use of polymer long-period waveguide gratings.
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.
authors.affiliation: Optoelectronics Research Centre, Department of Electronic Engineering, City University of Hong Kong, Hong Kong SAR, China.
authors.forename: Yiu Man
authors.initials: YM
authors.lastname: Chu
authors.forename: Kin Seng
authors.initials: KS
authors.lastname: Chiang
authors.forename: Qing
authors.initials: Q
authors.lastname: Liu