Design and Simulation of a Narrow Passband Electro-Optical Tunable Filter with Band-pass and Band-rejection Output |
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Authors: | Qianshu Zhang Yongzhi Liu Jinkun Liao Rongguo Lu Lin Huang Xionggui Tang Heping Li Yong Liu |
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Affiliation: | (1) Key Laboratory of Broadband Optical Fiber Transmission & Communication Networks, Ministry of Education, Opto-Electronic Information School, University of Electronic Science & Technology of China, Chengdu, 610054, China;(2) Department of Physics & Electronic Information, China West Normal University, Nanchong, 637002, China |
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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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Keywords: | Integrated optics device Electro-optical tunable filter Polymer waveguides Long-period waveguide gratings |
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