Jan Dorosz

Development of optical fiber technology in Poland

The paper is a digest of works presented during the XVIth National Symposium on Optical Fibres and Their Applications. The Symposium is organized since 1976. OFTA 2015 was organized by Optical Fibre Laboratory of the Faculty of Chemistry at University of Maria Curie Skłodowska, and Institute of Electronics and Information Technology of Lublin University of Technology, in Nałęczów on 22-25 September 2015. The meeting has gathered around 120 participants who presented 85 research and technical papers. The Symposium organized every 18 months is a good portrait of optical fibre technology development in Poland at university laboratories, governmental institutes, company R&D laboratories, etc. Topical tracks of the Symposium were: optical and photonic materials, technology of classical, tailored and structural photonic optical fibres, light propagation physics in optical fibres, passive and active optical fibre components, optical fibre sensors, passive and active optical fibre networks, optical fibre amplifiers and lasers, optical fibre network issues: modulation, architectures, economy, etc.

Influence of BaF2 and activator concentration on broadband near-infrared luminescence of Pr3+ ions in gallo-germanate glasses.

Thermal stability and broadband NIR luminescence of Pr(3+) doped gallo-germanate glasses with BaF2 have been studied. The thermal factors are larger for glass samples with low BaF2 content exhibiting good thermal stability against devitrification. Luminescence due to (1)D2 → (1)G4 transition of Pr(3+) was measured under 450 nm excitation. The (1)D2 measured lifetimes depend critically on activator concentration, but remain nearly unchanged with BaF2 content. The emission linewidth, the emission cross-section, the figure of merit (FOM) and the σem x FWHM product are relatively large, suggesting that Pr(3+)-doped gallo-germanate glasses with presence of BaF2 are promising as gain media for broadband near-infrared amplifiers.

Spectroscopic Properties of Yb^{3+}/Tb^{3+} Doped Germanate Glasses

In the article the cooperative energy transfer in GeO2 GaO BaO glass system doped with Yb/Tb under 980 nm laser diode excitation was investigated. The in uence of Tb concentration on the luminescent properties was determined. Measured strong luminescence at 489, 543, 586, 621 corresponds to D4 → FJ (J = 6, 4, 3) transitions and luminescence at 381, 415, 435 nm results from D3, G6 → FJ (J = 6, 5, 4) transitions. Mechanism and energy diagram involved in observed emission were discussed. The highest upconversion emission intensity was obtained in the germanate glass doped with 0.7 Yb2O3/0.7 Tb2O3.

Technology of soft-glass optical fiber capillaries

The paper describes preform based technology of soft-glass optical fibers. The most important parameters of soft-glass optical capillary are: hole dimension, proportion between air and glass in the cross-section and optical energy focusing near the air-glass boundary. The paper shows how, using technological methods, one can obtain required values of these parameters. Soft-glass optical capillaries of high mechanical, optical and geometrical quality are used as photonic components of sensors, functional devices and MOEMS.

Current developments of multicrucible technology of tailored optical fibers

The work presents recent developments of chosen aspects of optical fiber technology at the Research Production Department of Fiber Optics at Biaglass Co. The modified multicrucible technology of optical fibers, referred shortly to, throughout this work, as the MMC process was used to obtain several kinds of usable optical fibers for sensors and functional components of fiber microoptics. The MMC optical fibers were measured and their parameters were presented.

Measurement techniques of tailored optical fibers

Tailored optical fibers (TOF) may have non-standard geometrical shapes and dimensions as well as very complex internal refraction and physical structure. Practice shows, that in numerable cases, the standard measurement methods have to be specially adapted to particular case of a fiber. In some cases, a class of novel methods has to be worked out. In this work we present a number of modified measuring methods that suit the needs of characterization of a few basic kinds of tailored optical fibers such like: nonstandard dimension fibers, noncircular core fibers, complex shape fibers, complex refraction fibers, multicore optical fibers, nonlinear and active fibers. The modified measuring methods of tailored optical fibers include, among others: refractometry, polarimetry reflectometry, scatterometry, nefelometry, measurements of dimensions and shapes. Modifications of classical measuring equipment require usage of optimized light coupling techniques. The characterization and measuring methods of such fibers have to be standardized to enable the designers of the photonic functional systems (such as telemetric, sensory and optical signal processing) to apply them in a reliable and repeatable way.

Multicore Optical Fiber Components

The paper deals with Multicore Optical Fibres /MOFs/. Such fibres have two or more single mode or multimode or simultaneously both kinds of cores distributed in the cladding. The individual cores could be naturally coupled or not. We have made a few families of microoptical components of these fibres. These components have been used for construction of the following devices, circuits and equipment: hybrid integrated active optoelectronic devices, fiber optic network nodes, microoptics for links with multifactor flow, buses, signal processing - local and distributed, and various kinds of simple links. In the paper we outline the fibering techniques for multicore filaments, some of their theory and define basic kinds of operations. Then we present kinds of multicore optical fibre microcomponents and some results of our own laboratory experiments. The work concludes with a digest of existing as well as potential and ultimate applications of MOF microoptics and MOFs themselves. In other words, the paper deals with new possibilities of optical signal transmission, distribution and more complex processing like optical direct multiplexing, demultiplexing, mixing, interfacing, interfering, coupling in MOF microdevices for IO and COFOCS.

Helical core optical fibre made of Nd3+/Yb3+-doped oxyfluoride silicate glass

The properties of helical-core optical fibre made by authors from Nd3+/Yb3+-doped oxyfluoride silicate glass are presented. The construction and forming conditions of the helical-core optical fibre enabled to obtain the helix pitch from several mm and the off-set ranging from 10 μm to 200 μm. The paper also presents optimisation of Nd3+/Yb3+ ratio to enhance the emission bandwidth at 1 μm. In consequence of matching the values of the emission cross-section σem(Nd)and the absorption cross-section σabs(Yb) in the glass doped with 0.15Nd3+:0.45Yb3+ a broad (Δλ = 100nm) luminescence band in the vicinity of 1μm was obtained, which was the result of overlapping emission transitions: 2F5/2→2F7/2 in ytterbium and 4F3/2→4I11/2 in neodymium.

Recent developments of optical fiber technology at the Fiber Optic Department of Biaglass Co.

The work presents recent developments of optical fiber technology at the Research Production Department of Fiber Optics. The work on optical fibers was started, on the promontory of Bialystok Glass Works (BGW) (now Biaglass Co.), in 1978. A separate, Fiberoptic Department was created there, a few years later. This fact was reflecting, at that time, the dynamically developing research and manufacturing of soft-glass optical fibers, fiber components, sub- assemblies, devices, cables, bundles, illuminators, imageguides, sensors, and complete fiberoptic systems for research, biomedical, environmental industrial and military applications. Today, the research on and manufacturing of optical fibers, components and photonic systems at BGW and Biaglass Co., observes 20th anniversary. This round anniversary deserves to start this conference invited paper by a historical introduction, in which we summarize very concisely the contribution of BGW and Biaglass fiberoptic team to the national research, development and manufacturing scene of photonics.

The xanthene dyes doped PMMA microspheres for optical sensor applications

The numerous applications of luminescent glass and polymeric microspheres are well known. The polymeric structures are popular as they assure good processability (solid and porous structures) and high doping level. The article presents the suspension polymerization process of polymeric (PMMA) microspheres doped by xanthene dyes: Fluorescein (Fl) and Rhodamine B (RhB). The bright luminescence at wavelengths 510nm 595nm respectively was recorded. The shape and dimension distributions of fabricated microspheres were optically determined. The article presents also potential applications of fabricated luminescent microspheres.