Abstract
An electro-optical tunable filter comprised of two paralleled identical long-period waveguide gratings is proposed in this paper. The filter has one input port and two separate output ports, outputting band-pass and band-rejection light respectively. Using poled electro-optical polymer material to fabricate its waveguide cores enable the filter’s tuning speed to approach nanosecond order. With the aid of long-period waveguide gratings, the tuning range of the filter is Λ times larger than the conventional electro-optical filters. We built up a model to design and simulate the proposed tunable optical filter. We investigate the relationship between the parameters of the long-period waveguide grating and the characteristics of the tunable filter, such as tuning range and FWHM. The simulation results show that the tunable optical filter can realize high-speed tuning in the wavelength range of 1530 nm to 1560 nm, and the FWHM width can reach 0.8 nm. Compared with the conventional optical filters, the results show that a high-speed widely tunable optical filter with narrow pass band can be achieved.
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Acknowledgments
The authors are grateful for the support through the National Natural Science Foundation of China( No. 60736038), the National High Technology Research and Development Program of China (No.2007AA01Z269), the NCET Program (No. NCET-06-0805), the NCET Program (No. NCET-07-0152) and Sichuan Scientific Funds for Young Researchers (No. 08ZQ026-012). The authors would like to thank Prof. Kin Seng Chiang for helpful discussions on the coupled-mode theory.
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Zhang, Q., Liu, Y., Liao, J. et al. Design and Simulation of a Narrow Passband Electro-Optical Tunable Filter with Band-pass and Band-rejection Output. J Infrared Milli Terahz Waves 30, 959–968 (2009). https://doi.org/10.1007/s10762-009-9527-1
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DOI: https://doi.org/10.1007/s10762-009-9527-1