• Frontiers of Optoelectronics
  • Vol. 9, Issue 1, 112 (2016)
Jing DAI1、2, Minming ZHANG1、2、*, Feiya ZHOU1、2, and Deming LIU1、2
Author Affiliations
  • 1School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
  • 2Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
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    A highly efficient tunable optical filter of liquid crystal (LC) optical micro-ring resonator (MRR) was proposed. The 4-μm-radius ring consists of a silicon-oninsulator (SOI) asymmetric bent slot waveguide with a LC cladding. The geometry of the slot waveguide resulted in the strong electro-optic effect of the LC, and therefore induced an increase in effective refractive index by 0.0720 for the quasi-TE mode light in the slot-waveguide. The ultra-wide tuning range (56.0 nm) and large free spectral range (FSR) (~28.0 nm) of the optical filters enabled wavelength reconfigurable multiplexing devices with a drive voltage of only 5 V. The influences of parameters, such as the slot width, total width of Si rails and slot shift on the device’s performance, were analyzed and the optimal design was given. Moreover, the influence of fabrication tolerances and the loss of device were both investigated. Compared with state-of-the-art tunable MRRs, the proposed electrically tunable micro-ring resonator owns the excellent features of wider tuning ranges, larger FSRs and ultralow voltages.
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    Jing DAI, Minming ZHANG, Feiya ZHOU, Deming LIU. Highly efficient tunable optical filter based on liquid crystal micro-ring resonator with large free spectral range[J]. Frontiers of Optoelectronics, 2016, 9(1): 112
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    Received: Sep. 15, 2014
    Accepted: Jan. 21, 2015
    Posted: Jan. 1, 2016
    Published Online: Oct. 21, 2016
    The Author Email: ZHANG Minming (mmz@hust.edu.cn)