Michal Murawski

Polish Center of Photonics and Fibers

An optical fiber interferometric microprobe for detection of specific proteins is presented in this paper. The microprobe is an all-fiber device, which is based on Michelson interferometer configuration, which allows for detection of protein antigens in an analyzed solution thanks to antibodies immobilized on the sensor surface. The interferometer...

In presented work, we examined the structures of dual-core fibers paying special attention to the possibility of using them for sensing. In the hole-assisted fiber structure, the character of propagation in the cores was changed fluently, by post-processing the fiber, i.e. tapering with collapsing the holes. Fiber post-processing changed the condit...

We report on a new type of multicore fibres dedicated to a new generation of telecommunication networks. We designed and fabricated seven core fibres for (i) passive signal transmission, (ii) signal amplification and (iii) 1×7 signal division. In each case, the same cores and air-holes arrangement is used. However, a different operation is achieved...

In this paper, we experimentally studied group polarimetric pressure sensitivity of a fabricated elliptical core side-hole fiber (EC-SHF). We investigated the polarimetric behavior of this fiber under three steps of chosen pressure intervals of 100psi to 104psi, 1000psi to 1004psi and 2000psi to 2004psi, respectively. We obtained high group polarim...

We present a multicore fiber dedicated for next generation transmission systems. To overcome the issue of multicore fibers' integration with existing transmission systems, the fiber is designed in such a way that the transmission parameters for each core (i.e., chromatic dispersion, attenuation, bending loss, etc.) are in total accordance with the...

In this Letter we present, for the first time to our knowledge, the results of fiber Bragg grating (FBG) inscription in a novel microstructured multicore fiber characterized by seven single-mode isolated cores. A clear Bragg reflection peak can be observed in all of the 7 cores after one inscription process with a KrF nanosecond laser in a Talbot i...

Multicore optical fibers gained a lot of interest in the different fields of fiber sensing. This is mainly due to the possibility of carrying out simultaneous measurements on each core and simplicity of such fiber fabrication. A disadvantage of multicore fibers is related to the complex introducing and detecting light from the individual cores. In...

We show a new possibility for extension of supercontinuum spectrum generated in photonic crystal fibre towards the UV light. To do so, we use four wave mixing and cross phase modulation nonlinear effects as well as interaction of fundamental mode with higher order modes. It is shown that a few modes operation and proper dispersion profiles of these...

In this work we present a novel highly Ge doped microstructured fiber design dedicated for fiber Bragg grating (FBG) inscription and longitudinal strain sensing. Three series of the reported fiber differentiated by air-hole diameters were drawn and presented. After numerical analysis of the propagation conditions (with effective refractive index, l...

Constantly refined technology of manufacturing increasingly complex photonic crystal fibers (PCF) leads to new optical fiber sensor concepts. The ways of enhancing the influence of external factors (such as hydrostatic pressure, temperature, acceleration) on the fiber propagating conditions are commonly investigated in literature. On the other hand...

Microstructured optical fibers (MOF) sometimes also referred to as photonic crystal fibers (PCF) have been a subject of extensive research for over a decade. This is mainly due to the fact that by changing the microstructure geometry (e.g. distribution and size of the air-holes) fiber properties can be significantly modified to better fit specific...

We investigate a change of dispersion characteristic in a series of nonlinear photonic crystal fibers caused by slight variation of structural parameters, i.e. an air-hole diameter and a lattice constant. Each fiber has been fabricated to have zero dispersion wavelength close to 1064 nm. The generation of supercontinuum is also demonstrated with th...

Fundamental properties of pure silica microstructured fibres (MSFs) can be determined by their geometrical crosssection design. Investigation of nonlinear effects was widely evaluated in diverse types of MSFs with exactly defined dispersive properties. Proper design of Zero Dispersion Wavelength (ZDW) strongly influences generation of nonlinear pro...

Photonic crystal fibers (PCF), sometimes also referred to as microstructured fibers (MSF), have been a subject of extensive research for over a decade. This is mainly due to the fact that by changing the geometry and distribution of the air holes the fiber properties can be significantly modified and tailored to specific applications. In this paper...

In this work we would like to present the results of low loss coupling of a novel soft glass fiber for super continuum generation with standard single mode fiber by a filament splicing method. For our experiment we used an all solid soft glass microstructured fiber (MSF) made from a composition of F2 lead-silicate glass and NC21 borosilicate glass....

Nonlinear phenomena in microstructured fibers (MSFs) is defined by dispersive properties of a fiber. Zero dispersion wavelength (ZDW) and pump source wavelength play an important role in estimating the nonlinear effects and thus are subject of wide investigations. Multiple nonlinear processes like: four wave mixing (FWM), cross phase modulation (XP...

Phase sensitivities of temperature, longitudinal strain or pressure, are very important fiber features in sensing and telecommunication applications. The most common ways to modify such sensitivities are to change the material properties (by adjusting the core doping level) or employ microstructured fibers (which properties strongly depend on the c...

In this Letter, we present the technology of fiber Bragg grating (FBG) inscription in highly birefringent (HB) few-mode microstructured fibers (MSFs) with two different (nanosecond and femtosecond) lasers in a Talbot interferometer setup. The spectral characteristics of FBGs written in the core region of the investigated fiber, with particular mode...

form only given. Single mode microstructured fibers (MSF) are a subject of extensive research for over a decade now, mainly due to the fact that by changing the topology and distribution of the air holes, the fiber guiding (therefore also sensing) properties can be significantly modified and tailored to desired purposes [1]. Furthermore we have rec...

Sensitivity of optical fibers to the temperature, longitudinal strain or pressure, is a very important feature in many applications, such as sensors or telecommunication. The most common way to modify (depending on application - either mitigate or strengthen,) this sensitivity is changing the fiber material properties by appropriate glass doping or...

In this paper we have been experimentally investigated thermo-optic properties of a Co nanofluid filled mictrostructured fiber (MSF). We have prepared samples based on pure chemical compounds: cyklohexane and toluene and both of them were used as solvents for Co nanoparticles. MSF filled by cyklohexane and its mixture with Co nanoparticles worked o...

Fiber Bragg gratings (FBG) are one of the most successful fiber optic technologies with very interesting perspectives for application in fiber optic sensing. It has been already reported that the possibility of its fabrication in novel microstructured fibers (MSF), creating a unique 3D structure, can significantly improve their performance and sens...

Numerical Aperture (NA) is one of the fundamental properties of optical fibres. It determines the ability of efficient light coupling into the fibre and low loss splicing with other fibres. NA is essential when novel fibres are manufactured. Moreover, dispersive behaviour of geometrical guiding mechanisms, existing in microstructured fibres, is com...

form only given. Fibre sensitivity to the temperature, longitudinal strain or pressure, is a very important fibre feature in many applications, such as sensing application or telecommunication. The most common way to modify (either mitigate or strengthen, depending on application) this sensitivity is to change the material properties by doping or t...

We demonstrate an experimental study of the chromatic dispersion properties for a series of microstructured fibers (MSFs) dedicated for a supercontinuum generation. With white-light interferometry application we analyze experimentally how the small variations of structural parameters, i.e. an air-hole diameter and a lattice constant, influence disp...

In this paper we present the results of theoretical characterization of a few-mode birefringent microstructured fiber dedicated for fiber Bragg grating (FBG) inscription. The spectral characteristics of FBGs written (with a nanosecond and femtosecond laser Talbot interferometer setups) in the core region of the investigated fiber are presented and...

In this paper we present the technology and experimental results of the intensity based fiber optic threshold temperature sensor. As an optode of the sensor it was used a patch cord with an organic mixture filled photonic crystal fiber. Under temperature changes the used mixture changes its state from solid to liquid one and this effect decides abo...

In this paper we present the experimental comparison of mechanical and temperature sensitivities of Mach-Zehnder interferometer with replaceable FC connectorized sensing fibre arm, such as: off-the-shelf endlessly single mode microstructured fibre (MSF) or standard telecom single mode fibre. Experimental results clearly show reduced crosssensitivit...

The possibility of manufacturing highly birefringent (HB) microstructured optical fibers (MOF) made these fiber types very attractive for use in sensing applications. In contrary to traditional optical fibre sensors, properly designed MOF based components do not need temperature compensation as their birefringence remains insensitive to temperature...

Size, shape and location of the air holes allow to tailor microstructured fibre (MSF) parameters in a very wide range way beyond classical fibres what opens up many possibilities for various applications. Additionally, the propagation parameters of MSF can be actively tuned when the air-holes are filled with different gases, liquids (e.g., liquid c...

Dispersion characteristics are the fundamental properties of microstructured fibres (MSFs) with respect to the nonlinear applications. The changes of fibre dispersion may strongly influence the whole chain of diverse nonlinear effects resulting in supercontinuum generation (SG). Transferring the experience from the topics related to tailoring diffe...

Microstructured fibres (MSFs) reveal unique properties including endlessly single-mode operation from ultraviolet to infrared wavelengths, very high birefringence or nonlinearity, very large or very small effective mode field area, and many others. The size, shape and the location of the air holes allow for tailoring MSF parameters in a very wide r...

We report on low-loss patch cords composed of a highly reproducible low-loss fusion splicing of photonic crystal fibers (PCFs) with a standard single mode fiber (SMF). Distinct from other papers in this area we report on the results for different types of PCFs, including LMA fibers with similar to a SMF core size and a mode field diameter (MFD), as...

The paper presents the last data regarding new elements based on photonic crystal fibers such as the low-loss patch cord with a single mode fiber, the fused coupler, the asymmetric coupler for an active fiber power pump. Their fundamental optical characteristics including wavelength depending loss as a coupling ratio are presented in this paper as...

We report the methodology of effective low-loss fusion splicing a photonic crystal fibre (PCF) to itself as well as to a standard single mode fibre (SMF). Distinctly from other papers in this area, we report on the results for splicing suspended core (SC) PCF having tiny core and non-Gaussian shape of guided beam. We show that studied splices exhib...

The optimization of the fused splice between two identical PCFs as well as SMF•28 with different MFD PCFs made using the filament fusion with continuum laser illumination is reported. For identical PCFs splice loss of 0.15+/-0.04 dB @ 1.55 mum has been obtained. The SMF with PCF (MFD = 6.0 mum) splice losses are lower than 0.40 dB in comparison wit...

We report on the optimization of a fused splice between a photonic crystal fiber (PCF) with a standard single mode fiber (SMF) made by the filament fusion with continuous laser illumination. For the SMF·28 connection with a PCF having a similar mode field diameter splice losses are lower than 0.40 dB in comparison with the reported dependences in a...