Near Infrared Supercontinuum Generation in Silica Based Photonic Crystal Fiber

Abstract

This research explores a silica based highly nonlinear photonic crystal fiber of near infrared window; solid silica core photonic crystal fiber is suitable for propagating light towards the near-infrared wavelength region. Full vector finite difference method is used for numerical simulation, by solving the generalized nonlinear Schrödinger equation with the split-step Fourier method to show that the design exhibits high nonlinear coefficient, near zero ultra-flattened dispersion, low dispersion slope and very low confinement losses. It is demonstrated that it is possible to generate high power wide supercontinuum spectrum using 2.5 ps input pulses at 1.06 µm, 1.30 µm and 1.55 µm center wavelengths. It is observed that supercontinuum spectrum is broadened from 960 nm to 1890 nm by considering center wavelengths of 1.06 µm, 1.31 µm, and 1.55 µm into silica based index guiding highly nonlinear photonic crystal fiber. Furthermore, immensely short fiber length of 1 m at center wavelengths of 1.06 µm, 1.31 µm and 1.55 µm is possible using the proposed highly nonlinear photonic crystal fiber. The generated high power wide supercontinuum spectrum is applicable as a laser light source in near infrared band.

Modelling and simulation of novel liquid‐infiltrated PCF biosensor in Terahertz frequencies

“…Light guidance in PCFs is achieved by either photonic bandgap effect or total internal reflection mechanisms. PCFs are capable of offering excellent light guidance properties such as extremely low confinement loss [5], near‐zero ultra‐flattened chromatic dispersion [6], high sensitivity [7], large non‐linearity [8] and effective mode area [9]. Furthermore, optical properties of PCFs can be adapted to various applications by fine‐tuning the shape, size and position of the air hole discontinuities.…”

Proposal for a Quad-Elliptical Photonic Crystal Fiber for Terahertz Wave Guidance and Sensing Chemical Warfare Liquids

“…Confinement loss determines how well light is bounded within the core region. Confinement loss is generally directly related to the optical density of the core and expressed by [40] (cm ) = 8.686 2 × 10…”

“…The effective mode area Aeff is a quantification of the total area covered by the XP and YP modes in the transverse direction, and it is calculated using the following [40]: Figure 7 illustrates that the EML is higher in the XP and YP modes of the TE and QE designs than in those of the PE design. This result is due to the presence of bulk material in the core center of the TE and QE designs.…”

“…The effective mode area A eff is a quantification of the total area covered by the XP and YP modes in the transverse direction, and it is calculated using the following [40]:…”

“…Therefore, based on the demonstrated birefringence, power fraction, and total loss, subsequent simulations were based on the QE design. The effective mode area Aeff is a quantification of the total area covered by the XP and YP modes in the transverse direction, and it is calculated using the following [40]: Both integrations were computed over the whole fiber cross section, where I(r) = |E t | is the transverse electric field distribution.…”