Abstract
In this paper, the strain insensitive single mode optical fiber with low nonlinear effects and ultra low bending loss (BL), appropriate for small curvature radius installation, is presented. The suggested design method is based on the reverse engineering which evaluates the refractive index profile considering proper mode field diameter (MFD) value. Then, so as to attain the desired bending loss and strain response for the optical fiber, the optimization tool of the evolutionary genetic algorithm (GA) is employed to determine the optical and geometrical parameters of the structure. In the first designed fiber, the calculations for BL, MFD, effective area (Aeff), and effective refractive index (neff) sensitivity to strain in the well-known wavelength of 1.55 µm are 0.0018 dB per each turn of 5 mm curvature radius, 8.53 µm, 58 µm2, and 4.5 × 10-8 µɛ-1, respectively. Furthermore, the effect of placing raised outer cladding in the fiber structure is investigated which exhibits the MFD of 8.63 µm, 0.0093 dB BL for single turn of 5 mm radius, and 87 µm2 Aeff at 1.55 µm. In this case the strain sensitivity of 6.7 × 10-8 µɛ-1 is calculated for the neff. The mentioned effective area is magnificently large in the domain of bend insensitive fibers. In the meantime, the designed structures are insensitive to strain which is a crucial feature in applications with small curvature radius.
Highlights
Current strong demands on computer communication services like internet access services require economical solutions to provide broadband capability to access networks
The first challenge is to reduce the bending loss to meet the requirements of harsh end copper cable-like handling conditions
The transmission characteristics of the designed bend insensitive optical fiber must be resistant to the refractive index profile variations made by the external applied strain [4, 5]
Summary
Current strong demands on computer communication services like internet access services require economical solutions to provide broadband capability to access networks. The challenge is compatibility with the standard singlemode fibers (SMFs) installed in the telecommunication industry This compatibility could be achieved by reducing splicing loss during splicing of bend insensitive fiber structures with the conventional SMF [6]. Considering the three mentioned challenges, it is endeavored to introduce a design procedure so as to overcome these problems and present an optical fiber, holding superior characteristics in case of BL and nonlinear effects, without any reduction in MFD. Note that this structure is capable of use in small curvature applications, since the fiber response to any induced external strain is perfectly optimized.
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