Tapered photonic crystal fibers (PCFs), similar to tapered conventional fibers, can be either adiabatic of nonadiabatic. Here, we examine the adiabaticity of the PCF taper and obtain three-dimensional plots showing the evolution of power flow inside the tapered PCF. Also, we analyze different taper shapes, such as the linear taper, raised-cosine taper, and the modified exponential taper. Other factors, such as the taper length and the number of air hole rings are also investigated.
We present exact analytical solutions to the ideal one-dimensional planar photonic crystal waveguides (1-D PPCWs) that consist of a central core and infinite number of cladding layers symmetrically placed around the core. We show that these exact solutions allow one to distinguish clearly between light guidance due to total internal reflection and light guidance due to the photonic crystal effect. We also compare structures with finite and infinite cladding layers and provide results for the propagation characteristics and the modal field distributions.
In this paper, we introduce a novel optical fiber, referred to as Fresnel fiber. This fiber has equal area rings and is fabricated using two materials only. Transmission properties of Fresnel fibers, including axial propagation constant, effective area, and dispersion, are investigated. Design of these fibers for large or small effective area and prescribed dispersion characteristics, required for sensing or communication applications, are also addressed.
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