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Electrical and electronic engineering
The application of a nematic liquid crystal infiltrated solid core Photonic Crystal Fiber as a novel all-fiber in-line electronically controlled broadband fiber optic attenuator in the wavelength range from 1500 nm – 1600 nm is demonstrated. The device based on photonic bandgap transmission, is electronically controlled and due to its compact configuration, can be easily incorporated into an optical network. A low insertion loss at zero attenuation state and a high extinction ratio of ~ 40 dB is obtained between the high and low transmission states of the attenuator. The device works on the application of a varying voltage applied perpendicular to the fiber axis. The attenuation varies linearly with an increase in voltage, with a ~ 3.5 V increment required for 1 dB attenuation. The device is shown to have a flat spectral response for all attenuation states in the wavelength range. The device can be used as the core of a highly efficient in-line electronically controlled variable fibre optic attenuator.
Mathews, S., Farrell, G. &Semenova, Y. (2011) Experimental Demonstration of an All-Fiber Variable Optical Attenuator Based on Liquid Crystal Infiltrated Photonic Crystal Fiber. Microwave and Optical Technology Letters,Vol.53, no. 3, pp. 539–543. doi:10.1002/mop.25789