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4 March 2019 Ultra-flattened chromatic dispersion in all-solid hybrid micro-structured optical fibers for mid-infrared lightwave generation
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Abstract
Chromatic dispersion controlling is crucial in designing practical optical communication systems, and nonlinear systems. Ultra-flattened chromatic dispersion has been numerically performed in silica photonic crystal fibers (PCFs) whose chromatic dispersion variation can be as small as ±0.5 ps/km/nm. However, keeping arrays of air holes at precise sizes and shapes is highly required to realize the targeted dispersion. Consequently, this requires much effort in controlling air pressure during fiber fabrication and is considered as a disadvantage of PCFs. In this report, we propose a novel fiber structure for flexible controlling of chromatic dispersion. The fiber structure is obtained by adding six solid rods around the core of a step-index fiber. Ultra-flattened and close-to-zero chromatic dispersion can be realized by using this fiber structure. The variation of chromatic dispersion from 2.5 to 3.7 μm is as small as 0 ± 0.2 ps/km/nm. Using a laser pumping at 2 μm into a 5-cm-long fiber, highly coherent supercontinuum (1.2 – 3.3 μm at -20 dB level) is experimentally generated.
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Hoa Phuoc Trung Nguyen, Tuan Hoang Tong, Than Singh Saini, Xing Luo, Takenobu Suzuki, and Yasutake Ohishi "Ultra-flattened chromatic dispersion in all-solid hybrid micro-structured optical fibers for mid-infrared lightwave generation", Proc. SPIE 10902, Nonlinear Frequency Generation and Conversion: Materials and Devices XVIII, 109021Q (4 March 2019); https://doi.org/10.1117/12.2509006
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