Kate Sugden | Aston University (original) (raw)
Papers by Kate Sugden
CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference, 2009
... Raja P Pappu*, Wei Zhang, Ian Bennion, Kate Sugden PhotonicsResearchGroup, Aston University, ... more ... Raja P Pappu*, Wei Zhang, Ian Bennion, Kate Sugden PhotonicsResearchGroup, Aston University, BirminghamB4 7ET, UK, *pappurp@aston.ac.uk ... Optical fiber based sensors, since they are easy to embed in structures, simple to multiplex and ofsmall weight, are an attractive ...
Journal of Lightwave Technology, 2015
We take advantage of the Raman soliton self-frequency shift experienced during the propagation in... more We take advantage of the Raman soliton self-frequency shift experienced during the propagation in an anomalous dispersive photonic crystal fiber in order to continuously tune the central frequency of ultrashort pulses. We discuss the fiber properties to be favored to obtain high power spectral densities and we carry out an extensive experimental study of the properties of the frequency shifted pulses in terms of spectral, autocorrelation, and RF spectrum measurements.
Optics Express
We present a novel device for the characterisation of static magnetic fields through monitoring w... more We present a novel device for the characterisation of static magnetic fields through monitoring wavelength shifts of femtosecond inscribed fibre Bragg grating and micromachined slot, coated with Terfenol-D. The device was sensitive to static magnetic fields and can be used as a vectoral sensor for the detection of magnetic fields as low as 0.046 mT with a resolution of ± 0.3mT in transmission and ± 0.7mT in reflection. The use of a femtosecond laser to both inscribe the FBGs and micromachine the slot in a single stage prior to coating the device significantly simplifies the fabrication.
Proceedings of SPIE - The International Society for Optical Engineering
A novel device for the detection and characterisation of static magnetic fields is presented. It ... more A novel device for the detection and characterisation of static magnetic fields is presented. It consists of a femtosecond laser inscribed fibre Bragg grating (FBG) that is incorporated into an optical fibre with a femtosecond laser micromachined slot. The symmetry of the fibre is broken by the micro-slot, producing non-uniform strain across the fibre cross section. The sensing region is coated with Terfenol-D making the device sensitive to static magnetic fields, whereas the symmetry breaking results in a vectorial sensor for the detection of magnetic fields as low as 0.046 mT with a resolution of +/-0.3mT in transmission and +/-0.7mT in reflection. The sensor output is directly wavelength encoded from the FBG filtering, leading to simple demodulation through the monitoring of wavelength shifts that result as the fibre structure changes shape in response to the external magnetic field. The use of a femtosecond laser to both inscribe the FBG and micro-machine the slot in a single st...
Electronics Letters, 1994
Chirped gratings with very broad reflection bandwidths up to 44 nm and high reflectivity have bee... more Chirped gratings with very broad reflection bandwidths up to 44 nm and high reflectivity have been produced holographically in boron-codoped and standard telecommunications fibers which have been hydrogen-soaked. A 2 nm wide transmission band has been produced within the broad reflection band by use of an amplitude mask during grating exposure.
Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XVI, 2012
ABSTRACT As optical coherence tomography (OCT) becomes widespread, validation and characterizatio... more ABSTRACT As optical coherence tomography (OCT) becomes widespread, validation and characterization of systems becomes important. Reference standards are required to qualitatively and quantitatively measure the performance between difference systems. This would allow the performance degradation of the system over time to be monitored. In this report, the properties of the femtosecond inscribed structures from three different systems for making suitable OCT characterization artefacts (phantoms) are analyzed. The parameter test samples are directly inscribed inside transparent materials. The structures are characterized using an optical microscope and a swept-source OCT. The high reproducibility of the inscribed structures shows high potential for producing multi-modality OCT calibration and characterization phantoms. Such that a single artefact can be used to characterize multiple performance parameters such the resolution, linearity, distortion, and imaging depths.
2008 Conference on Lasers and Electro-Optics, 2008
The glass used was Standard BK7 microscope slides of 3mm thickness. The sample was mounted on a j... more The glass used was Standard BK7 microscope slides of 3mm thickness. The sample was mounted on a jig on a 3D stage with the beam delivered through a machining objective on a linear stage. The beam was focused by an air-spaced triplet lens of focal length 66mm an NA of ...
2003 Conference on Lasers and Electro-Optics Europe (CLEO/Europe 2003) (IEEE Cat. No.03TH8666), 2003
Abstract In this paper we consider the possibility of using intermediate solutions, in which idea... more Abstract In this paper we consider the possibility of using intermediate solutions, in which ideal apodisation profile for a dispersion-free, sharp-reflection profile fibre Bragg grating approximated in different degrees. The ideal apodisation profile for a flat dispersion, 50 ...
2008 Conference on Lasers and Electro-Optics, 2008
ABSTRACT A 1.2(height)×125(depth)×500(length) micro-slot was engraved along a fiber Bragg grating... more ABSTRACT A 1.2(height)×125(depth)×500(length) micro-slot was engraved along a fiber Bragg grating by chemically assisted femtosecond laser processing. By filling epoxy and UV-curing, waveguide with plastic-core and silica-cladding was created, presenting high thermal responding coefficient of 211pm/°C.
In this paper, we report the successful realization of c-band operable FBG-based Gires-Tournois e... more In this paper, we report the successful realization of c-band operable FBG-based Gires-Tournois etalon dispersion compensations where the dispersion tuning range has been more than doubled by the inclusion of an additional etalon. This results in a compact tunable dispersion compensator, which has the advantages of multi-channel operation, extremely low group delay ripple, and low cost.
Advanced Photonics & Renewable Energy, 2010
ABSTRACT
20th International Conference on Optical Fibre Sensors, 2009
PHOSFOS (Photonic Skins For Optical Sensing) is a research project funded by the European Commiss... more PHOSFOS (Photonic Skins For Optical Sensing) is a research project funded by the European Commission's 7 th Framework Programme. The project aims at developing a flexible and stretchable foil that integrates highly advanced optical fibre sensing elements as well as optical and electrical powering functionalities and read-out of the sensors. This skin-like foil can be wrapped around or attached to irregularly shaped objects or bodies and will allow quasi-distributed sensing of mechanical quantities such as deformation and pressure. The applications targeted can be found in the fields of structural health monitoring and healthcare.
Optics Letters, 2007
We propose and demonstrate novel virtual Gires-Tournois (GT) etalons based on fiber gratings. By ... more We propose and demonstrate novel virtual Gires-Tournois (GT) etalons based on fiber gratings. By introducing an additional phase modulation in wideband linearly chirped fiber Bragg gratings, we have successfully generated GT resonance with only one grating. This technique can simplify the fabrication procedure while retaining the normal advantages of distributed etalons, including their full compatibility with optical fiber, low insertion loss, and low cost. Such etalons can be used as dispersion compensation devices in optical transmission systems.
This paper explains the principles behind multiwavelength operation of an erbium-doped fiber lase... more This paper explains the principles behind multiwavelength operation of an erbium-doped fiber laser (EDFL) under the combined effect of cavity phase modulation and periodic wavelength filtering. A mathematical model is developed to simulate the behaviour of the multiwavelength EDFL, both in time and frequency domains. The effects of various parameters such as pump power, filter channel spacing, modulation index and frequency are observed and explained. An all-fiber EDFL was constructed, using a piezo-transducer-based phase modulator and a Sagnac loop periodic filter, to validate the theoretical results. The effects of pump power, modulation frequency and modulation index were monitored experimentally, justifying the theoretical explanation. The multiwavelength EDFL has several potential applications in fiber sensing due to its flexible all-fiber design.
CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference, 2009
... Raja P Pappu*, Wei Zhang, Ian Bennion, Kate Sugden PhotonicsResearchGroup, Aston University, ... more ... Raja P Pappu*, Wei Zhang, Ian Bennion, Kate Sugden PhotonicsResearchGroup, Aston University, BirminghamB4 7ET, UK, *pappurp@aston.ac.uk ... Optical fiber based sensors, since they are easy to embed in structures, simple to multiplex and ofsmall weight, are an attractive ...
Journal of Lightwave Technology, 2015
We take advantage of the Raman soliton self-frequency shift experienced during the propagation in... more We take advantage of the Raman soliton self-frequency shift experienced during the propagation in an anomalous dispersive photonic crystal fiber in order to continuously tune the central frequency of ultrashort pulses. We discuss the fiber properties to be favored to obtain high power spectral densities and we carry out an extensive experimental study of the properties of the frequency shifted pulses in terms of spectral, autocorrelation, and RF spectrum measurements.
Optics Express
We present a novel device for the characterisation of static magnetic fields through monitoring w... more We present a novel device for the characterisation of static magnetic fields through monitoring wavelength shifts of femtosecond inscribed fibre Bragg grating and micromachined slot, coated with Terfenol-D. The device was sensitive to static magnetic fields and can be used as a vectoral sensor for the detection of magnetic fields as low as 0.046 mT with a resolution of ± 0.3mT in transmission and ± 0.7mT in reflection. The use of a femtosecond laser to both inscribe the FBGs and micromachine the slot in a single stage prior to coating the device significantly simplifies the fabrication.
Proceedings of SPIE - The International Society for Optical Engineering
A novel device for the detection and characterisation of static magnetic fields is presented. It ... more A novel device for the detection and characterisation of static magnetic fields is presented. It consists of a femtosecond laser inscribed fibre Bragg grating (FBG) that is incorporated into an optical fibre with a femtosecond laser micromachined slot. The symmetry of the fibre is broken by the micro-slot, producing non-uniform strain across the fibre cross section. The sensing region is coated with Terfenol-D making the device sensitive to static magnetic fields, whereas the symmetry breaking results in a vectorial sensor for the detection of magnetic fields as low as 0.046 mT with a resolution of +/-0.3mT in transmission and +/-0.7mT in reflection. The sensor output is directly wavelength encoded from the FBG filtering, leading to simple demodulation through the monitoring of wavelength shifts that result as the fibre structure changes shape in response to the external magnetic field. The use of a femtosecond laser to both inscribe the FBG and micro-machine the slot in a single st...
Electronics Letters, 1994
Chirped gratings with very broad reflection bandwidths up to 44 nm and high reflectivity have bee... more Chirped gratings with very broad reflection bandwidths up to 44 nm and high reflectivity have been produced holographically in boron-codoped and standard telecommunications fibers which have been hydrogen-soaked. A 2 nm wide transmission band has been produced within the broad reflection band by use of an amplitude mask during grating exposure.
Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XVI, 2012
ABSTRACT As optical coherence tomography (OCT) becomes widespread, validation and characterizatio... more ABSTRACT As optical coherence tomography (OCT) becomes widespread, validation and characterization of systems becomes important. Reference standards are required to qualitatively and quantitatively measure the performance between difference systems. This would allow the performance degradation of the system over time to be monitored. In this report, the properties of the femtosecond inscribed structures from three different systems for making suitable OCT characterization artefacts (phantoms) are analyzed. The parameter test samples are directly inscribed inside transparent materials. The structures are characterized using an optical microscope and a swept-source OCT. The high reproducibility of the inscribed structures shows high potential for producing multi-modality OCT calibration and characterization phantoms. Such that a single artefact can be used to characterize multiple performance parameters such the resolution, linearity, distortion, and imaging depths.
2008 Conference on Lasers and Electro-Optics, 2008
The glass used was Standard BK7 microscope slides of 3mm thickness. The sample was mounted on a j... more The glass used was Standard BK7 microscope slides of 3mm thickness. The sample was mounted on a jig on a 3D stage with the beam delivered through a machining objective on a linear stage. The beam was focused by an air-spaced triplet lens of focal length 66mm an NA of ...
2003 Conference on Lasers and Electro-Optics Europe (CLEO/Europe 2003) (IEEE Cat. No.03TH8666), 2003
Abstract In this paper we consider the possibility of using intermediate solutions, in which idea... more Abstract In this paper we consider the possibility of using intermediate solutions, in which ideal apodisation profile for a dispersion-free, sharp-reflection profile fibre Bragg grating approximated in different degrees. The ideal apodisation profile for a flat dispersion, 50 ...
2008 Conference on Lasers and Electro-Optics, 2008
ABSTRACT A 1.2(height)×125(depth)×500(length) micro-slot was engraved along a fiber Bragg grating... more ABSTRACT A 1.2(height)×125(depth)×500(length) micro-slot was engraved along a fiber Bragg grating by chemically assisted femtosecond laser processing. By filling epoxy and UV-curing, waveguide with plastic-core and silica-cladding was created, presenting high thermal responding coefficient of 211pm/°C.
In this paper, we report the successful realization of c-band operable FBG-based Gires-Tournois e... more In this paper, we report the successful realization of c-band operable FBG-based Gires-Tournois etalon dispersion compensations where the dispersion tuning range has been more than doubled by the inclusion of an additional etalon. This results in a compact tunable dispersion compensator, which has the advantages of multi-channel operation, extremely low group delay ripple, and low cost.
Advanced Photonics & Renewable Energy, 2010
ABSTRACT
20th International Conference on Optical Fibre Sensors, 2009
PHOSFOS (Photonic Skins For Optical Sensing) is a research project funded by the European Commiss... more PHOSFOS (Photonic Skins For Optical Sensing) is a research project funded by the European Commission's 7 th Framework Programme. The project aims at developing a flexible and stretchable foil that integrates highly advanced optical fibre sensing elements as well as optical and electrical powering functionalities and read-out of the sensors. This skin-like foil can be wrapped around or attached to irregularly shaped objects or bodies and will allow quasi-distributed sensing of mechanical quantities such as deformation and pressure. The applications targeted can be found in the fields of structural health monitoring and healthcare.
Optics Letters, 2007
We propose and demonstrate novel virtual Gires-Tournois (GT) etalons based on fiber gratings. By ... more We propose and demonstrate novel virtual Gires-Tournois (GT) etalons based on fiber gratings. By introducing an additional phase modulation in wideband linearly chirped fiber Bragg gratings, we have successfully generated GT resonance with only one grating. This technique can simplify the fabrication procedure while retaining the normal advantages of distributed etalons, including their full compatibility with optical fiber, low insertion loss, and low cost. Such etalons can be used as dispersion compensation devices in optical transmission systems.
This paper explains the principles behind multiwavelength operation of an erbium-doped fiber lase... more This paper explains the principles behind multiwavelength operation of an erbium-doped fiber laser (EDFL) under the combined effect of cavity phase modulation and periodic wavelength filtering. A mathematical model is developed to simulate the behaviour of the multiwavelength EDFL, both in time and frequency domains. The effects of various parameters such as pump power, filter channel spacing, modulation index and frequency are observed and explained. An all-fiber EDFL was constructed, using a piezo-transducer-based phase modulator and a Sagnac loop periodic filter, to validate the theoretical results. The effects of pump power, modulation frequency and modulation index were monitored experimentally, justifying the theoretical explanation. The multiwavelength EDFL has several potential applications in fiber sensing due to its flexible all-fiber design.