A dispersion engineered PCF for broadband fiber optic parametric amplification

摘要

We report a wide bandwidth high gain parametric sources based on dispersion engineered highly nonlinear multi-material photonic crystal fiber (PCF). The multi-material PCF compositions are made of highly nonlinear As2S3 as the background material and the first air-hole ring replaced with borosilicate rods. The unique composition is targeted for a suitable dispersion (D) profile for high gain with a wider bandwidth. The PCF profile is engineered in such a way that the D characteristics are having near-zero value and having small positive (+ve) value of fourth order dispersion parameter (beta(4)) that favours the condition for very wide fiber optic parametric amplifier (FOPA) bandwidth. We detailed about the dependency of pump power, fiber length and operating wavelength on parametric gain and bandwidth. Based on the numerical studies, we obtained a very wide 3 dB FOPA bandwidth of around 2500 nm in the near IR region. The obtained bandwidth is very wide, and the approach presented in this article is very unique. These results will be extremely useful for devising potential photonic sources in near and mid-IR window.