Rostislav R Khrapko

Space Division Multiplexing in Short Reach Optical Interconnects

Many technical capabilities of space division multiplexed systems like low loss and crosstalk have been established in numerous long-haul system experiments. Recently more attention has been given to applications of space division multiplexing for short reach systems, including data center transmission and sensing applications. Short reach systems may be the first high volume application, as space division multiplexing for short reach systems has fewer remaining technical challenges. In addition to higher bandwidth density, space division multiplexed systems offer potential advantages in lower power consumption and cost. In this paper we present penalty-free bit error ratio results down to

Accumulated self-focusing of ultraviolet light in silica glass

10^{-12}

Performance Comparison of a New Low-Attenuation Fibre with G.652 Fibre in Unrepeatered Single-Span Systems

from system tests on 200 meters of 8-core multicore fiber with fan-outs and up to 2 km in dual-core multicore fiber with connectors and fan-outs.

Fused silica having low OH, OD levels and method of making

Exposure to UV light induces structural changes in silica glass. This leads to a change in density, refractive index, optical absorption, and stress. Prolonged exposure causes catastrophic damage in the form of microchannels (extended microscopic voids), not satisfactorily explained so far. We demonstrate how microchannels are created by a plasma spark in the cores of compaction-induced waveguides. The waveguides form as a result of an accumulated self-focusing effect, directly observed by in-situ microscopy. We describe the formation of a complex, permanent 3D refractive index structure in the glass, and explain how the characteristic scales of that structure evolve during the UV exposure. While single pulse dynamic self-focusing has been extensively studied, we report a multi-pulse accumulated effect.

Chalcogenide doping of oxide glasses

Results are presented for single-span WDM transmission experiments with a new low-attenuation fibre (~0.17 dB/km). We compare this fibre and G.652 fibre in multiple system configurations, showing consistent reach advantages with the low-attenuation fibre.