Abstract
We present a method by which the degree of longitudinal variation in photonic crystal fibre (PCF) may be characterised through seeded four-wave mixing (FWM). Using an iterative numerical reconstruction, we created a theoretical model of the PCF that displays FWM phasematching properties that are similar to experiment across all measured length scales. Our results demonstrate that the structure of our PCF varies by less than ±1 % and that the characteristic length of the variations is approximately 15 cm.
Highlights
This year marks the 20th anniversary of the first demonstration of light guidance in photonic crystal fibre (PCF) formed by an array of air holes in a solid silica glass matrix [1]
We present a method by which the degree of longitudinal variation in photonic crystal fibre (PCF) may be characterised through seeded four-wave mixing (FWM)
The success of PCF is primarily due to its capacity for engineering group-velocity dispersion (GVD) through changing the diameter, d, and pitch, Λ, of the air holes that form the cladding [5]
Summary
This year marks the 20th anniversary of the first demonstration of light guidance in photonic crystal fibre (PCF) formed by an array of air holes in a solid silica glass matrix [1]. The success of PCF is primarily due to its capacity for engineering group-velocity dispersion (GVD) through changing the diameter, d, and pitch, Λ, of the air holes that form the cladding [5] This enables the transition between normal and anomalous GVD, known as the zero-dispersion wavelength (ZDW), to be tuned over a much wider range than in conventional fibre, yielding control over both linear propagation and nonlinear processes. When compared to methods of determining the two-photon probability distribution by photon counting [19, 20, 8], SET-based techniques typically achieve higher resolution and are significantly faster We describe how this enabled us to measure rapidly a large number of PCF segments and determine the length scale of the structural variation
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