Abstract
This paper reports the design and the fabrication of an all-solid photonic bandgap fiber with core diameter larger than 100 µm, a record effective mode area of about 3700 µm2 at 1035 nm and robust single-mode behavior on propagation length as short as 90 cm. These properties are obtained by using a pixelated Bragg fiber geometry together with an heterostructuration of the cladding and the appropriated generalized half wave stack condition applied to the first three higher order modes. We detail the numerical study that permitted to select the most efficient cladding geometry and present the experimental results that validate our approach.
Highlights
The large place occupied today by fiber laser systems on the laser marketplace is well explained by the advantages of this technology over other approaches based on bulk systems [1]
This paper reports the design and the fabrication of an all-solid photonic bandgap fiber with core diameter larger than 100 μm, a record effective mode area of about 3700 μm2 at 1035 nm and robust single-mode behavior on propagation length as short as 90 cm
These properties are obtained by using a pixelated Bragg fiber geometry together with an heterostructuration of the cladding and the appropriated generalized half wave stack condition applied to the first three higher order modes
Summary
The large place occupied today by fiber laser systems on the laser marketplace is well explained by the advantages of this technology over other approaches based on bulk systems [1]. Even if hardly comparable (some of these fibers being active, passive, polarizationmaintaining or not), this figure demonstrates that only few solutions can propose MFD larger than 60 μm even in the case of passive fibers that are a priori more easy to realize As mentionned above this figure illustrates the growing performances of SC-PBGFs that today seem in position to compete with other fiber geometries while offering some added value like an all-solid structure that greatly facilitates fabrication and splicing or spectral filtering via photonic bandgap effect, which helps to reject undesired wavelengths (like, for example, the Raman effect [23]). Other aims are to simplify the PiBF manufacturing by reducing the number of high index rings from 3 to 2 and to take fully advantage of the filtering effect of the Photonic Bandgap (PBG) guidance by operating in a high order photonic bandgap window
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