Abstract

In this paper, we have analyzed Rectangular Trench-Assisted Fiber [RTAF] for Mode Field Diameter [MFD] and low macro-bending loss. The modified profile of trench-assisted fibbers consists of central core and outer claddings. In between the cladding introducing deep trench filled by low RI materials. We analyze the effect of core, cladding and trench parameters on bending loss and MFD. We have theoretically studied the effect of different trench parameters on effective mode field diameter, and macro-bending loss of optical fiber by finite element method with a trench-assisted optical fiber model. The results show that all the properties are affected obviously by the trench. The analysis shows that the relative refractive index difference in trench affects the properties of mode field diameter and bending loss in optical fibbers for FTTH applications. Bend insensitive single-mode fibers are attractive for fiber-to-the-home (FTTH) applications because they can lower the installation costs and improve system performance [1]. They can increasing refractive index difference between core and cladding glass while reducing the mode field diameter (MFD), adding a low index trench (Fluorine doped glass ring) [2], There have been many reports on bend-insensitive optical fibers that employ such techniques as reducing the mode field diameter (MFD) [3]. When talking about trench-assisted optical fiber (TA-F), bend-insensitive optical fiber can be used in FTTH applications. The trench can reduce both macro-bending loss [4, 5] and micro-bending loss [6]. It performs perfectly in following the ITU-T G.652 standard to achieve very low bending loss.

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