Subhasis Chaudhuri

Exploring the Effect of the Core Boundary Curvature in Hollow Antiresonant Fibers

Through numerical simulations, we systematically study the leakage loss properties of a simplified novel hollow antiresonant fiber in which the core is surrounded by semi-elliptical elements. These studies lead to new insight into the effect of the curvature of the core boundary in antiresonant fibers. We observe in particular that in our design, there exists an optimum curvature of the elements—which we quantify simply through the aspect ratio of the ellipses—for which the fiber’s leakage loss is minimized. Furthermore, it is shown that elliptical elements can lead to orders of magnitude loss reduction as compared with similar fibers with circular ones.

Low loss transmission in negative curvature optical fibers with elliptical capillary tubes

Regular and nested negative curvature optical fibers with elliptical capillary tubes have been proposed in this paper for ultralow loss guidance at the telecommunication wavelength. Finite element modeling shows that these fibers can have lower loss compared to their counterparts with circular tubes. These hollow core fibers with low loss and large bandwidth can have huge potential applications in data transmission, sensing, high power delivery, and serve as an ideal platform for the study of a wide variety of nonlinear optical effects.

Single crystal small core semiconductor optical fibers for all-fiber optoelectronics

Recent development of fabricating small core single-crystal silicon and germanium optical fibers using a visible laser crystallization technique is reviewed. These fibers have potential applications in fiber-based nonlinear optical devices and optoelectronic applications.

Small core SiGe alloy optical fibers by templated deposition

Small core Si-Ge alloy optical fibers have been fabricated by templated deposition inside silica capillaries using high-pressure chemical vapor deposition. These fibers can have a wide variety of applications in optics and optoelectronics.

Templated growth of II-VI semiconductor optical fiber devices and steps towards infrared fiber lasers

ZnSe and other zinc chalcogenide semiconductor materials can be doped with divalent transition metal ions to create a mid-IR laser gain medium with active function in the wavelength range 2 - 5 microns and potentially beyond using frequency conversion. As a step towards fiberized laser devices, we have manufactured ZnSe semiconductor fiber waveguides with low (less than 1dB/cm at 1550nm) optical losses, as well as more complex ternary alloys with ZnSxSe(1-x) stoichiometry to potentially allow for annular heterostructures with effective and low order mode corecladding waveguiding.

Hydrogenated Amorphous Germanium Optical Fiber

Hydrogenated amorphous germanium step index optical fibers have been fabricated by high pressure chemical vapor deposition ensuring high hydrogen content thereby passivizing dangling bonds. These fibers can be used for various infrared applications.