Abstract
We report on an easy-to-evaluate expression for the prediction of the bend-loss for a large mode area photonic crystal fiber (PCF) with a triangular air-hole lattice. The expression is based on a recently proposed formulation of the V-parameter for a PCF and contains no free parameters. The validity of the expression is verified experimentally for varying fiber parameters as well as bend radius. The typical deviation between the position of the measured and the predicted bend loss edge is within measurement uncertainty.
Highlights
In solid-core photonic crystal fibers (PCF) the air-silica microstructured cladding gives rise to a variety of novel phenomena [1] including large-mode area (LMA) endlesslysingle mode operation [2]
The PCF is operated close to cut-off where VP∗CF = π [11] so that the argument may be written as LMA-20 LMA-25 LMA-35
It is emphasized that the predictions are based on the empirical relations for Aeff and VPCF provided in Refs. [12] and [13] respectively and do not require any numerical calculations
Summary
In solid-core photonic crystal fibers (PCF) the air-silica microstructured cladding (see Fig. 1) gives rise to a variety of novel phenomena [1] including large-mode area (LMA) endlesslysingle mode operation [2]. Though PCFs typically have optical properties very different from that of standard fibers they share some of the overall properties such as the susceptibility of the attenuation to macro-bending. Macrobending-induced attenuation in PCFs has been addressed both experimentally as well as theoretically/numerically in a number of papers [2, 3, 4, 5, 6]. Predicting bendingloss is no simple task and typically involves a full numerical solution of Maxwell’s equations as well as use of a phenomenological free parameter, e.g. an effective core radius. In this paper we revisit the problem and show how macro-bending loss measurements on high-quality PCFs can be predicted with high accuracy using easy-to-evaluate empirical relations
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