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30 August 2006 Microwave electrooptic coefficient and modulation applications using ferroelectric single-crystal fibers
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Besides the well-known LiNbO3, ferroelectric strontium barium niobate (SBN) crystals are attractive for electrooptic modulation applications because of their high electrooptic coefficients and low half wave voltage. Their EO properties, typically obtained under low frequency electric field driving conditions, contain both primary and secondary contributions arising from electromechanical coupling. Single crystal fibers (Sr,Ba)Nb2O6 and LiNbO3 grown by laser heated pedestal growth method are investigated to explore the frequency dependence of electrooptic property both for mechanically stress-free crystals (low frequency) and at microwave driving frequency of 10GHz. An optical pulse can be up-tuned/down-tuned, squeezed/ expended in the range of GHz using a single piece of SBN crystal fiber under a moderate microwave field, controlled by the relative position of optical pulse traversing the crystal fiber to the microwave field. The effective microwave-photonic interactions demonstrated in ferroelectric SBN crystals provide a potential solution for the bandwidth definitions and wavelength tuning applications. The experimental configuration and the analysis are also of general significance in electrooptic property studies at microwave frequencies.
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Chuanyong Huang, Jonathan Taylor, Hongbo Liu, Amar Bhalla, and Ruyan Guo "Microwave electrooptic coefficient and modulation applications using ferroelectric single-crystal fibers", Proc. SPIE 6314, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications XII, 63140X (30 August 2006);

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