Abstract
We present a detailed procedure of precise chromatic dispersion and mode-field characterization of unknown photonic crystal fibers for their further utilization in nonlinear applications. To verify our methods an Endlessly single-mode photonic crystal fiber (ESM-PCF) was used. A finite- element method simulation software was utilized for mode-field distribution and chromatic dispersion simulation based on the particular fiber structure. Subsequently, a measurement setup for dispersion characterization was proposed, based on the Mach-Zehnder interferometer. Experiment results include as well the influence of various optical elements in the configuration on the measured fiber parameters. Second experimental setup was realized with the possibility of parallel mode-field diameter measurement and visualization of the fiber core structure. Effective area and dispersion measurements results were compared to the simulation outputs. We achieved up to 5 nm accuracy of zero-dispersion wavelength for a 28 cm long ESM- PCF and maximum mismatch of 2 pm2 with effective mode-field area determination. Our procedures and characterization outputs could be applied to specialty optical fiber design and characterization mainly for nonlinear applications such as supercontinuum generation.
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