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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 34,
  • Issue 15,
  • pp. 3503-3509
  • (2016)

Tunable Broadband Spectrum Under the Influence of Temperature in IR Region Using CS $_2$ Core Photonic Crystal Fiber

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Abstract

We theoretically demonstrate a bandwidth tunable broadband light spectrum in IR region, using a CS $_2$ core photonic crystal fiber (CSPCF) by varying its temperature. The broadband spectrum is generated via modulation instability (MI) induced supercontinuum (SC) generation process by considering the thermooptic coefficient of CS $_2$ liquid. The temperature-dependent fiber parameters are utilized to solve the nonlinear Schr $\ddot{\mathrm {o}}$ dinger equation, which is modified with the effect of saturable nonlinearity of CS $_2$ . By using numerical simulation, generation of new photons through the process of MI and subsequent evolution of SC spectrum are analyzed under the influence of temperature. The generated SC spectrum shows a variation of a several hundred nanometers in its bandwidth with a change of mere 20 $^\circ$ C in the temperature of CSPCF. It is found that the bandwidth of SC spectrum can be tuned from 688 nm to 1022 nm by varying temperature, saturable parameter, and pump power. The proposed tunable SC spectrum finds application in IR spectroscopy, optical coherence tomography, etc.

© 2016 IEEE

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