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