Abstract
Drawing of the hollow all-polymer Bragg fibers based on PMMA/PS and PVDF/PC materials combinations are demonstrated. Hole collapse during drawing effects the uniformity of a photonic crystal reflector in the resultant fiber. We first investigate how the core collapse effects fiber transmission properties. We then present modelling of fluid dynamics of hollow multilayer polymer fiber drawing. Particularly, hole collapse during drawing and layer thickness non-uniformity are investigated as a function of draw temperature, draw ratio, feeding speed, core pressurization and mismatch of material properties in a multilayer. Both the newtonian and non-newtonian cases are considered assuming slender geometries.
Highlights
Hole collapse is identified as a key parameter effecting transmission properties of the resultant hollow Bragg fiber
The hole collapse caused by surface tension is characterized as well as the closely related layer thickness non-uniformity
While hole pressurization provides a very effective way of compensating for the hole collapse, it is found that the final fiber dimensions are very sensitive to the value of an overpressure
Summary
Hollow core multilayer and microstructured optical fibers (MOF) for radiation guiding in the near and mid-infrared (IR) [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17] have recently received close attention as they promise considerable advantage over their solid core counterparts in applications related to power guidance at almost any IR wavelength for military, industry and medical applications, IR imaging and sensing, and even THz transmission. To understand the effect of a hole collapse on the transmission properties of the resultant fibers, in Fig. 2(a) we first present a set of theoretical curves showing radiation losses of the T E 01 core modes for the high index-contrast air filled fibers drawn with different values of C r, while featuring the same outside diameter f o. In this example, Cr corresponds to a target hollow core fiber nc = 1 with a strictly periodic 15 layer quarter-wave reflector having material refractive indices nh. In what follows we quantify hole collapse and layer non-uniformity as a function of the standard control parameters during drawing
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