Design and Simulation of a Narrow Passband Electro-Optical Tunable Filter with Band-pass and Band-rejection Output
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Design and Simulation of a Narrow Passband Electro-Optical Tunable Filter with Band-pass and Band-rejection Output Qianshu Zhang & Yongzhi Liu & Jinkun Liao & Rongguo Lu & Lin Huang & Xionggui Tang & Heping Li & Yong Liu
Received: 23 February 2009 / Accepted: 20 May 2009 / Published online: 2 June 2009 # Springer Science + Business Media, LLC 2009
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. Keywords Integrated optics device . Electro-optical tunable filter . Polymer waveguides . Long-period waveguide gratings
1 Introduction Optical networking and sensing system require high-performance optical tunable filters. In the WDM optical networking system, optical tunable filters are widely used in the areas of Q. Zhang : Y. Liu : J. Liao : R. Lu : L. Huang : X. Tang : H. Li : Y. Liu 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 Q. Zhang (*) Department of Physics & Electronic Information, China West Normal University, Nanchong 637002, China e-mail: [email protected]
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J Infrared Milli Terahz Waves (2009) 30:959–968
wavelength channel monitoring, optical add/drop multiplexer, and reconfigurable optical networks. Optical tunable filters also act as demodulators in fiber optic sensor systems. It is desirable for the filters to have fast tuning speed (nanosecond region), large wavelength tuning range and narrow bandwidth. Some optical tunable filters have been developed, Examples are fiber-based Fabry-Perot (F-P) tunable optical filter (TOF), the micro- electro- mechanical systems (MEMS) F-P TOF, fiber Bragg gratings TOF[1] and the acousto-optic tunable filter[2]. These filters can have about 100 nm tuning range, but the tuning speed can only reach microsecond order because of the slow tuning mechanism, which is limited by the slow response time of piezoelectric effect, electrostatic actuatio
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