InPhoTech Ltd.

Bagno, Poland

InPhoTech Ltd.

Bagno, Poland
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Tenderenda T.,InPhoTech Ltd. | Tenderenda T.,Warsaw University of Technology | Szostkiewicz L.,InPhoTech Ltd. | Szostkiewicz L.,Warsaw University of Technology | And 7 more authors.
Optics Express | Year: 2017

We investigate the influence of air holes on phase sensitivity in microstructured optical fibers to longitudinal strain. According to the numerical simulations performed, large air holes in close proximity to a fiber core introduce significant compression stress to the core, which results in an increase in the effective refractive index sensitivity to longitudinal strain. The theoretical investigation is verified by an experiment performed on four fibers drawn from the same preform and differentiated by air hole diameter. We show that introducing properly designed air holes can lead to a considerable increase in normalized effective refractive index sensitivity to axial strain from -0.21 e-1 (for traditional single mode fiber) to -0.14 e-1. © 2017 Optical Society of America.

Marc P.,Military University of Technology | Piliszek P.,Military University of Technology | Murawski M.,Military University of Technology | Murawski M.,InPhoTech Ltd. | And 5 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2012

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 crystals) or solid materials (e.g., polymers). The mode confinement in such a filled MSF can be affected by temperature dependent refractive index of material filling the fibre. This idea puts forward a new type of components for creating novel fibre devices such as switches, attenuators and others. Variable optical attenuators (VOAs) play an important role in optical communications as equalizers for dynamic channel power and wavelength division multiplexing in a transmission system. Controlling and monitoring of optical power are also necessary in sensing applications, and especially, in optical systems which require high power laser operation or critical temperature threshold monitoring. Various types of VOA have been developed based on different mechanisms, such as bending loss control, light leaking from the fibre cladding, temperature tuning of the polymer incorporated into the tapered microstructured fibre or electrical tuning of the liquid crystal layers. In this paper we would like to discuss the highly dynamic VOA based on a tuneable microstructured fibre filled with different chemical mixtures used as an on/off temperature switch. Furthermore, the technology of low loss coupling and splicing of the applied MSF with a standard single mode fibre has been developed. Therefore, in the proposed application an optical signal can be transmitted to and from the switch by a standard telecom fibre which considerably reduces transmission losses and allows for the use of standard off-the-shelf components reducing costs of the overall system. © 2012 SPIE.

Stepien K.,InPhoTech Ltd. | Stepien K.,Military University of Technology | Jozwik M.,InPhoTech Ltd. | Tenderenda T.,InPhoTech Ltd. | And 2 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

In this paper we present the idea and test results of an all-fiber unbalanced Mach-Zehnder interferometer for fiber Bragg grating shift demodulation. The interferometer design allows to monitor Bragg wavelength changes (caused by temperature or strain variations) as changes of intensity on the output detector. Furthermore the construction is cost-effective and based on simple optoelectronic components, which makes the solution attractive for application as a low cost fiber Bragg grating interrogator. © 2015 SPIE.

Stepien K.,InPhoTech Ltd. | Stepien K.,Military University of Technology | Jozwik M.,InPhoTech Ltd. | Nasilowski T.,InPhoTech Ltd.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

In this paper we present a fiber Bragg grating shift demodulator with changeable resolution based on an unbalanced fiber Mach-Zehnder interferometer. Preliminary research proves phase sensitivity to Bragg wavelength changes of 6,83 rad/mε. Phase sensitivity can be modified by changing the optical path difference witch is only limited by the coherence length of light reflected by the fiber Bragg grating. This solution can be used as a single sensor or as a part of a more complex system. © 2015 SPIE.

Tenderenda T.,Military University of Technology | Tenderenda T.,InPhoTech Ltd. | Murawski M.,Military University of Technology | Murawski M.,InPhoTech Ltd. | And 12 more authors.
Optics Letters | Year: 2013

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 modes represented by dual peaks, are presented and discussed. Furthermore, we calculate the fundamental fiber parameters (mode effective refractive index and phase modal birefringence) from the spectral characteristics and show very good agreement with the performed numerical fiber characterization. We expect the results of our experiments to be very useful in future development of FBG sensors based on novel HB MSFs, with enhanced strain sensitivity of higher-order modes. © 2013 Optical Society of America.

Tenderenda T.,InPhoTech Ltd. | Tenderenda T.,Military University of Technology | Skorupski K.,Maria Curie Sklodowska University | Makara M.,Maria Curie Sklodowska University | And 6 more authors.
Optics Express | Year: 2012

We present the results of theoretical and experimental characterization of a designed and manufactured dual-mode highly birefringent microstructured fiber. We also demonstrate the measured values of polarimetric temperature and strain sensitivity of both the fundamental and second order modes. As the mode field of the second order mode has a strong interaction with the fiber air holes, we observed a significant (over two orders of magnitude) increase in the polarimetric strain sensitivity of this mode in comparison to the fundamental mode. The enhanced strain sensitivity together with the low temperature sensitivity makes our fiber very attractive for application as extremely sensitive temperature independent strain transducers. © 2012 Optical Society of America.

Holdynski Z.,Military University of Technology | Holdynski Z.,InPhoTech Ltd. | Napierala M.,Military University of Technology | Napierala M.,InPhoTech Ltd. | And 9 more authors.
Optics Express | Year: 2013

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 dispersion characteristics in different groups of MSFs. Our study provides useful information on how to design the fiber which is less sensitive to the fabrication imperfections. Moreover those investigations are the initial step to the development of the customized or tunable supercontinuum light sources based on MSFs with slightly changed structural parameters which can generate light with a different spectrum range, adapted to a proper application. © 2013 Optical Society of America.

Stanczyk T.,InPhoTech Ltd. | Wysokinski K.,InPhoTech Ltd. | Filipowicz M.,InPhoTech Ltd. | Tenderenda T.,InPhoTech Ltd. | And 7 more authors.
Journal of Lightwave Technology | Year: 2015

In this study, an innovative method is presented for preparing optical fibers for application in fiber optic sensors operating in harsh environments. It is shown, how to attach a metal-coated fiber electrolytically to a metal sensing element, as well as an electroless method for depositing a nickel protective layer on optical fibers. Additionally, the results of the reliability tests of these methods are presented. It is also shown, that by depositing an additional nickel protective layer, it is possible to slow down the oxidation process of the copper coating. Analysis of the conducted experiments allows us to predict, that the connection method investigated and the method of protecting the fiber are robust and may find application in industrial optical sensors. © 2014 IEEE.

Stepien K.,Military University of Technology | Stepien K.,InPhoTech Ltd. | Slowikowski M.,InPhoTech Ltd. | Tenderenda T.,Military University of Technology | And 13 more authors.
Optics Letters | Year: 2014

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 interferometer set up. We furthermore perform a numerical analysis of the effective refractive indices of the particular modes and compare it with the FBG inscription results. An experimental analysis of the strain and temperature sensitivities of all of the Bragg peaks is also included. © 2014 Optical Society of America.

Fidelus J.D.,InPhoTech Ltd. | Fidelus J.D.,Polish Academy of Sciences | Zhou W.,University of St. Andrews | Tenderenda T.,InPhoTech Ltd. | Nasilowski T.,InPhoTech Ltd.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

In this work we present a nanocrystalline monoclinic ZrO2 with large free volumen open towards the nanocrystals surface dedicated for optical oxygen sensors. Nanoporous zirconia nanopowder was fabricated in hydrothermal microwave-driven process followed by annealing at 800°C. Metal-coated optical fibers are proposed as a light carrier when the working temperature exceeds 500°C. The obtained results may also find application in luminescent fiber optic oxygen sensors. © 2015 SPIE.

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