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Accurately Shaping Supercontinuum Spectrum via Cascaded PCF
Jifang Rong1, Hua Yang1,2, Yuzhe Xiao3
1College of Computer Science and Electronic Engineering, Key laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education, Hunan University, Changsha 410082, Hunan Province, China.
Sensors (Basel, Switzerland)
|May 1, 2020
Summary
We demonstrate a fiber cascading method to generate broad and flat supercontinuum (SC) spectra in silica photonic crystal fibers (PCFs). This technique expands the SC range and enhances spectral flatness for near-infrared applications.
Area of Science:
- Optics and Photonics
- Nonlinear Optics
- Materials Science
Background:
- Supercontinuum (SC) generation is crucial for various optical applications.
- Achieving wide and flat SC spectra remains a significant challenge.
- Photonic crystal fibers (PCFs) offer unique dispersion properties for SC generation.
Purpose of the Study:
- To demonstrate a numerical method for shaping supercontinuum spectra.
- To significantly increase the spectral width and flatness of SC using fiber cascading.
- To propose a cost-effective and easily implementable method for broad and flat SC generation.
Main Methods:
- Numerical simulations were employed to model SC generation.
- A fiber cascading method using segmented PCFs with dual zero-dispersion frequencies (ZDFs) was utilized.
- Tuning the spacing between ZDFs and adjusting pump power were key parameters.
Main Results:
- The fiber cascading method significantly broadened and flattened the SC spectrum.
- Tuning ZDF spacing expanded the spectral range of the SC.
- Increased pump power enhanced soliton trapping and improved blue-edge flatness.
- Cascading a second PCF segment ensured red-edge spectral flatness.
Conclusions:
- Fiber cascading in PCFs is an effective method for generating broad and flat SC spectra.
- The proposed method offers a cost-effective alternative for near-infrared SC generation.
- This technique is readily implementable in standard photonics laboratories.
