Perturbation theory of a doubly clad optical fiber with a low-index inner cladding

Effect of Distortions on an Annular Optical Fiber Waveguide

“…The various profiles of refractive index are used to control the propagation characteristic of light in optical waveguides. These profiles are doubly clad profiles [1], W-type profiles [2], M-type profiles [3], etc. The transmission of light through M-type dielectric-profile optical fiber has attracted attention during the past few years in several applications [4][5][6].…”

“…The transmission of light through M-type dielectric-profile optical fiber has attracted attention during the past few years in several applications [4][5][6]. The annular core fibers (ACF), which are also known as ring-core fibers, are a special case of the Mtype dielectric-profile optical fiber having the same refractive indices of the inner and outer cladding [1]. The fabrications of ACF waveguides are simple, and they can also be fabricated with a femtosecondpulse laser-writing technique [7].…”

Effect of cladding layers on the mode of circular optical waveguides

“…A properly designed W-fiber supports a fundamental mode with a finite cut-off wavelength [12][13][14]. At discrete wavelengths longer than cut-off, the fundamental mode experiences large amounts of loss.…”

“…However, the double-clad optical fiber waveguide is a novel type of optical waveguides having number of advantages on the single-clad fiber [12,14]. This waveguide differs from the standard circular step-index fibers in respect of bounded condition of ligthwave.…”

Modal Analysis and Cutoff Condition of a Circular Doubly Clad Optical Waveguide with Plasma in Inner Cladding Region

“…Moreover, the doubly clad optical waveguides is a novel type of optical waveguides having various advantages on the single clad fiber [15,16]. This waveguides differ from the standard circular step-index fibers in respect of bounded condition of lightwave.…”