Reduced loss in SiGe-core optical fibers

Sørgård, Trygve; Mühlberger, Korbinian; Wu, Wei; Xiong, Yang; Hawkins, Thomas; Ballato, John; Laurell, Fredrik; Fokine, Michael; Gibson, Ursula J.

doi:10.1364/cleo_si.2018.sf3i.6

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…While the intensity/mode structure of a polycrystalline fiber varied as the input fiber was displaced across the polished input face of the core, the output spot of the Ge-cap fiber was stable when illuminated off-axis, indicating the lens-like structure was collecting and focusing the transmitted light. The homogeneous fiber was shorter, but the pattern observed is typical of translationally annealed fibers with lengths of several mm [16]. The minimum diode current needed for an image with the Ge cap fiber corresponded to an intensity ∼15x smaller than that required for visualization of the maximum intensity regions through the shorter, cap-removed fiber.…”

Section: Sige Fibers -15% Gementioning

confidence: 88%

Ge-capped SiGe core optical fibers

Balcı

Mühlberger

et al. 2019

Opt. Mater. Express

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CO 2 laser processing offers the possibility to inscribe structures within glass-clad SiGe-core fibers by altering the spatial distribution of the Si and Ge. Spatial segregation of Ge to the end of a fiber is shown via optical transmission measurements used to alter the local bandgap, and the curved end of the fiber focuses the output of a multimode fiber. Scalable fabrication is demonstrated using a commercial CO 2 laser engraver for processing of arrays.

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Section: Sige Fibers -15% Gementioning

confidence: 88%

Ge-capped SiGe core optical fibers

Balcı

Mühlberger

et al. 2019

Opt. Mater. Express

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“…In particular, oven annealing [20], CO 2 laser treatment [7,9,21], and laser-induced tapering [22] have been used to improve the optical transmission for silicon core fiber, and recent results on Ge core material are also promising. Laser treatment of SiGe core fibers has been used to reduce losses [23], to produce single-crystal cores [24], and promote the formation of Janus particles [14]. Thermomigration gathers Ge in the higher temperature region [24,25], and variations in the power and translation velocity of the laser can be used to vary the local composition of the core material, as preferential segregation of the silicon occurs during crystallization.…”

Section: Introductionmentioning

confidence: 99%

CO₂ laser annealed SiGe core optical fibers with radial Ge concentration gradients

Balcı

Song

et al. 2020

Opt. Mater. Express

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CO 2 laser annealing of SiGe core, glass-clad optical fibers is a powerful technique for the production of single-crystal cores with spatially varying Ge concentrations. Laser power, laser scan speed and cooling air flow alter the Ge distribution during annealing. In this work, near-single crystal fibers exhibiting a central axial feature with peak Ge concentration ∼15 at% higher than the exterior of the semiconductor core have been prepared. Preferential transmission of near infrared radiation through the Ge-rich region, and spectral data confirm its role as a waveguide within the semiconductor core. This proof-of-concept step toward crystalline double-clad structures is an important advancement in semiconductor core optical fibers made using the scalable molten core method.

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Semiconductor core fibres: materials science in a bottle

2021

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Novel core fibers have a wide range of applications in optics, as sources, detectors and nonlinear response media. Optoelectronic, and even electronic device applications are now possible, due to the introduction of methods for drawing fibres with a semiconductor core. This review examines progress in the development of glass-clad, crystalline core fibres, with an emphasis on semiconducting cores. The underlying materials science and the importance of post-processing techniques for recrystallization and purification are examined, with achievements and future prospects tied to the phase diagrams of the core materials.

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Reduced loss in SiGe-core optical fibers

Cited by 3 publications

References 5 publications

Ge-capped SiGe core optical fibers

Ge-capped SiGe core optical fibers

CO₂ laser annealed SiGe core optical fibers with radial Ge concentration gradients

Semiconductor core fibres: materials science in a bottle

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Reduced loss in SiGe-core optical fibers

Cited by 3 publications

References 5 publications

Ge-capped SiGe core optical fibers

Ge-capped SiGe core optical fibers

CO2 laser annealed SiGe core optical fibers with radial Ge concentration gradients

Semiconductor core fibres: materials science in a bottle

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CO₂ laser annealed SiGe core optical fibers with radial Ge concentration gradients