Search results for: Anders Bjarklev

Items from 1 to 16 out of 16 results

article

Low loss liquid crystal photonic bandgap fiber in the near-infrared region

Lara Scolari, Lei Wei, Sebastian Gauza, Shin-Tson Wu, more

Optical Review > 2011 > 18 > 1 > 114-116

We infiltrate a perdeuterated liquid crystal with a reduced infrared absorption in a photonic crystal fiber. The H atoms of this liquid crystal were substituted with D atoms in order to move the vibration bands which cause absorption loss to longer wavelengths and therefore reduce the absorption in the spectral range of 1–2 μm. We achieve in the middle of the near-infrared transmission bandgap the...

chapter

167 W, 1178 nm ytterbium-doped photonic bandgap fiber amplifier with power scalability

Christina B. Olausson, Akira Shirakawa, Meishin Chen, Jens K. Lyngso, more

CLEO/QELS: 2010 Laser Science to Photonic Applications > 1 - 2

2010 Conference on Lasers and Electro-Optics (CLEO)

We have generated 167 W of output power at 1178 nm using an ytterbium-doped photonic bandgap fiber. Distributed spectral filtering efficiently suppresses amplified spontaneous emission at shorter wavelengths and enables power scalable amplification at 1178nm.

chapter

Electrically tunable bandpass filter based on liquid crystal photonic bandgap fibers

Lei Wei, Thomas Tanggaard Alkeskjold, Anders Bjarklev

2010 Conference on Optical Fiber Communication (OFC/NFOEC), collocated National Fiber Optic Engineers Conference > 1 - 3

2010 Conference on Optical Fiber Communication - OFC 2010. Collocated National Fiber Optic Engineers Conference OFC/NFOEC 2010

An electrically tunable bandpass filter based on two photonic crystal fibers filled with different liquid crystals is demonstrated. Both the short-wavelength and long-wavelength edge are tuned individually or simultaneously with the response time in milliseconds.

chapter

Compact electrically controlled broadband liquid crystal photonic bandgap fiber polarizer

Lei Wei, Thomas Tanggaard Alkeskjold, Anders Bjarklev

2009 35th European Conference on Optical Communication > 1 - 2

2009 35th European Conference on Optical Communication (ECOC)

An electrically controlled liquid crystal photonic-bandgap fiber polarizer is experimentally demonstrated. A maximum 21.3dB electrically tunable polarization extinction ratio is achieved with 45° rotatable transmission axis as well as switched on and off in 1300nm–1600nm.

chapter

High thermal and electrical tunability of negative dielectric liquid crystal photonic bandgap fibers

Lei Wei,, Lara Scolari, Johannes Weirich, Thomas T. Alkeskjold, more

2008 Conference on Lasers and Electro-Optics > 1 - 2

2008 Conference on Lasers and Electro-Optics (CLEO)

We infiltrate photonic crystal fibers with negative dielectric liquid crystals. 400nm bandgap shift is obtained in the range 22°C−80°C and 119nm shift of the long-wavelength bandgap edge is achieved by applying a voltage of 200V_rms.

chapter

Biased liquid crystal photonic bandgap fiber

Johannes Weirich, Jesper Laegsgaard, Thomas Tanggaard Alkeskjold, Jan S. Hesthaven, more

2008 Conference on Lasers and Electro-Optics > 1 - 2

2008 Conference on Lasers and Electro-Optics (CLEO)

We simulate the director structure of all capillaries in a biased photonic crystal fiber infiltrated with liquid crystals. Various mode simulations for different capillaries show the necessity to consider the entire structure.

article

Modelling of supercontinuum generation in highly nonlinear photonic crystal fibres

Nikola I. Nikolov, Thorkild Sørensen, Ole Bang, Anders Bjarklev, more

Journal of Optical and Fiber Communications Research > 2008 > 5 > 1-6 > 1-21

We present a detailed explanation of the modelling of supercontinuum generation in highly nonlinear photonic crystal fibers (PCFs) with low-power picosecond pulses. Due to the strong nonlinearity and necessary broad-band description, the model takes into account self-phase-modulation, cross-phase-modulation, four-wave-mixing, stimulated Raman scattering, linear loss, birefringence, and up to 7th order...

article

Semiconductor optical amplifier based swept wavelength source at 1060nm using a scanning Fabry–Perot filter and an YDFA-based booster amplifier

Frederik D. Nielsen, Lars Thrane, Kevin Hsu, Anders Bjarklev, more

Optics Communications > 2007 > 271 > 1 > 197-202

We demonstrate a tuneable laser operating in the 1–1.1μm wavelength region with a tuning range of 43nm (FWHM), an output power of 19mW and coherence length of 14mm. The source is based on a master laser consisting of a cavity tuned ring configuration with a fibre Fabry–Perot filter used as a tuning element and a semiconductor amplifier as gain medium. The output of the master laser is subsequently...

article

Spectral properties of liquid crystal photonic bandgap fibres with splay-aligned mesogens

Giovanni Tartarini, Thomas Tanggaard Alkeskjold, Lara Scolari, Anders Bjarklev, more

Optical and Quantum Electronics > 2007 > 39 > 10-11 > 913-925

Through a detailed electromagnetic analysis we investigate the characteristics of liquid crystal infiltrated photonic crystal Fibers guiding by the Photonic Bandgap effect. The analysis, carried out using the Finite Element Method and including also material dispersion effects, puts into evidence particular spectral features related to the so-called splay alignment of the molecules constituting the...

article

Integrating liquid crystal based optical devices in photonic crystal fibers

Thomas Tanggaard Alkeskjold, Lara Scolari, Danny Noordegraaf, Jesper Lægsgaard, more

Optical and Quantum Electronics > 2007 > 39 > 12-13 > 1009-1019

Liquid crystal photonic bandgap fibers form a versatile and robust platform for designing optical fiber devices, which are highly tunable and exhibit novel optical properties for manipulation of guided light. We present fiber devices for spectral filtering and polarization control/analysis.

chapter

A microstructured polymer optical fiber biosensor

Grigoriy Emiliyanov, Jesper B. Jensen, Poul E. Hoiby, Ole Bang, more

2006 Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference > 1 - 2

2006 Conference on Lasers & Electro-Optics/Quantum Electronics and Laser Science Conference (CLEO/QELS)

We demonstrate selective detection of fluorophore labeled antibodies from minute samples probed by a sensor layer of the complementary biomolecules immobilized inside the air holes of microstructured Polymer Optical Fibers.

article

Reduction of coupling loss to photonic crystal fibers by controlled hole collapse: a numerical study

Jesper Lægsgaard, Anders Bjarklev

Optics Communications > 2004 > 237 > 4-6 > 431-435

The mode profile evolution of small-core photonic crystal fibers (PCFs) during a gradual collapse of the cladding airholes is investigated. The mode overlap with standard step-index fibers having a small index contrast is calculated, and it is found that overlaps around 90% can be achieved in all cases studied, with the proper degree of hole collapse. Thus, hole collapse induced by, e.g. laser irradiation...

article

Coupling reducing k-points for photonic crystal fiber calculations

Maja Albertsen, Jesper Lægsgaard, Stig E. Barkou Libori, Kristian Hougaard, more

Photonics and Nanostructures - Fundamentals and Applications > 2003 > 1 > 1 > 43-53

When describing localized electromagnetic modes in dielectric waveguides by the planewave method, a supercell geometry must necessarily be adopted. We demonstrate in the present work that the convergence of the calculations with respect to supercell size depends strongly on the choice of the transverse Bloch wave vector, k. We describe a method to derive k-points that minimize the coupling between...

article

Modelling photonic crystal fibres with Hermite-Gaussian functions

Erik Knudsen, Anders Bjarklev

Optics Communications > 2003 > 222 > 1-6 > 155-160

In this paper we present a new variant of the localised function method used when modelling photonic crystal fibres. This variant is based solely on Hermite-Gaussian expansion series, which introduces the possibility of directly modelling fibres with finite claddings. We investigate the challenges and advantages of such a model and compare it to a proven modelling tool, namely the plane-wave method.

article

Photonic Crystal Fibers: A New Class of Optical Waveguides

Jes Broeng, Dmitri Mogilevstev, Stig E. Barkou, Anders Bjarklev

Optical Fiber Technology > 1999 > 5 > 3 > 305-330

Remarkable properties of optical fibers with a high-index core region and a surrounding silica/air photonic crystal cladding have recently been reported. Here we discuss the physics, the special guiding properties, and the theoretical tools developed for the modeling of these photonic crystal fibers. With an emphasis on the applicational aspects of the fibers, we study their single-mode operation,...

article

Hybrid Erbium-Doped Fiber for Gain Flattened Operation

Anders Bjarklev

Optical Fiber Technology > 1997 > 3 > 1 > 72-76

A new hybrid erbium-doped-fiber design is proposed for amplifiers with flattened gain spectra. The design prescribes different parts of the erbium-doped fiber core to be codoped with different materials. Due to specific relations between the codopant material and their emission and absorption spectra, the hybrid-fiber design makes use of opposite gain tilts to cancel out each other. Numerical results...

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