Applied diode laser spectroscopy and characterization of optical fiber nonlinearity: Dissertation

Research output: ThesisDissertationCollection of Articles

Abstract

This thesis describes work and progress on accurate nonlinearity measurements of optical fibers, design and characterization of external cavity diode lasers, and spectroscopic measurement of air temperature and humidity for accurate determination of the refractive index of air. The first part of the thesis describes measurement of the nonlinear coefficient of standard and erbium-doped singlemode fibers, commonly used in telecommunications. A simulation tool was developed to model the previously neglected effects of dispersion in the continuous-wave self-phase modulation method. The simulation can be included in already existing measurement set-ups increasing their versatility and reducing their uncertainty. It is shown that reliable erbium-doped fiber nonlinearity measurements are possible even for very short fibers when the whole measurement system is carefully characterized for nonlinearity. With the help of the dispersion simulation and a carefully optimized fiber optic power measurement, an expanded uncertainty of 2.0 % (k =2) was achieved for the nonlinearity of a single-mode fiber. The Expanded uncertainty for measurement of an erbium-doped fiber was found to be 3.0 % (k =2). Applied diode laser spectroscopy is covered in the second part of this thesis. External-cavity diode laser based on nondispersive holographic volume grating was designed and characterized in this work. The use of a non-dispersive element for feedback eliminates beam directional variations and enables compact design with good wavelength reproducibility. Laser designs for applications in metrology, molecular spectroscopy and for multicomponent absorption spectroscopy were developed. This thesis describes accurate measurement of temperature and humidity using diode laser spectroscopy, which is crucial for refractive index compensation in demanding interferometric length measurements. The measurement system was tested both in laboratory and outdoor environment successfully over distances up to 130 m. The standard deviation of temperature measurement in laboratory environment was 7 mK using a 120 s sample time, which is the best spectroscopic value ever reported. Performance of the system was found to be excellent when a commercial interferometer was compensated in an environment with local temperature variations, demonstrating the suitability of the method for industrial dimensional measurements. A portable and robust temperature measurement set-up was developed for long-distance geodetic applications. The set-up was tested successfully in harsh outdoor conditions.
Original languageEnglish
QualificationDoctor Degree
Awarding Institution
  • Aalto University
Supervisors/Advisors
  • Ikonen, Erkki, Supervisor, External person
  • Merimaa, Mikko, Advisor
Award date9 Dec 2011
Place of PublicationEspoo
Publisher
Print ISBNs978-952-5610-74-1 (PDF)
Publication statusPublished - 2011
MoE publication typeG5 Doctoral dissertation (article)

Fingerprint

laser spectroscopy
optical fibers
nonlinearity
diodes
theses
fibers
erbium
temperature measurement
humidity
semiconductor lasers
refractivity
molecular spectroscopy
dimensional measurement
cavities
simulation
air
versatility
phase modulation
metrology
continuous radiation

Keywords

  • nonlinear fiber optics
  • external-cavity diode lasers
  • refractive index of air
  • spectroscopic thermometry

Cite this

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title = "Applied diode laser spectroscopy and characterization of optical fiber nonlinearity: Dissertation",
abstract = "This thesis describes work and progress on accurate nonlinearity measurements of optical fibers, design and characterization of external cavity diode lasers, and spectroscopic measurement of air temperature and humidity for accurate determination of the refractive index of air. The first part of the thesis describes measurement of the nonlinear coefficient of standard and erbium-doped singlemode fibers, commonly used in telecommunications. A simulation tool was developed to model the previously neglected effects of dispersion in the continuous-wave self-phase modulation method. The simulation can be included in already existing measurement set-ups increasing their versatility and reducing their uncertainty. It is shown that reliable erbium-doped fiber nonlinearity measurements are possible even for very short fibers when the whole measurement system is carefully characterized for nonlinearity. With the help of the dispersion simulation and a carefully optimized fiber optic power measurement, an expanded uncertainty of 2.0 {\%} (k =2) was achieved for the nonlinearity of a single-mode fiber. The Expanded uncertainty for measurement of an erbium-doped fiber was found to be 3.0 {\%} (k =2). Applied diode laser spectroscopy is covered in the second part of this thesis. External-cavity diode laser based on nondispersive holographic volume grating was designed and characterized in this work. The use of a non-dispersive element for feedback eliminates beam directional variations and enables compact design with good wavelength reproducibility. Laser designs for applications in metrology, molecular spectroscopy and for multicomponent absorption spectroscopy were developed. This thesis describes accurate measurement of temperature and humidity using diode laser spectroscopy, which is crucial for refractive index compensation in demanding interferometric length measurements. The measurement system was tested both in laboratory and outdoor environment successfully over distances up to 130 m. The standard deviation of temperature measurement in laboratory environment was 7 mK using a 120 s sample time, which is the best spectroscopic value ever reported. Performance of the system was found to be excellent when a commercial interferometer was compensated in an environment with local temperature variations, demonstrating the suitability of the method for industrial dimensional measurements. A portable and robust temperature measurement set-up was developed for long-distance geodetic applications. The set-up was tested successfully in harsh outdoor conditions.",
keywords = "nonlinear fiber optics, external-cavity diode lasers, refractive index of air, spectroscopic thermometry",
author = "Tuomas Hieta",
year = "2011",
language = "English",
isbn = "978-952-5610-74-1 (PDF)",
series = "MIKES Publication",
publisher = "Centre of Metrology and Accreditation",
number = "J3/2011",
address = "Finland",
school = "Aalto University",

}

Applied diode laser spectroscopy and characterization of optical fiber nonlinearity : Dissertation. / Hieta, Tuomas.

Espoo : Centre of Metrology and Accreditation, 2011. 147 p.

Research output: ThesisDissertationCollection of Articles

TY - THES

T1 - Applied diode laser spectroscopy and characterization of optical fiber nonlinearity

T2 - Dissertation

AU - Hieta, Tuomas

PY - 2011

Y1 - 2011

N2 - This thesis describes work and progress on accurate nonlinearity measurements of optical fibers, design and characterization of external cavity diode lasers, and spectroscopic measurement of air temperature and humidity for accurate determination of the refractive index of air. The first part of the thesis describes measurement of the nonlinear coefficient of standard and erbium-doped singlemode fibers, commonly used in telecommunications. A simulation tool was developed to model the previously neglected effects of dispersion in the continuous-wave self-phase modulation method. The simulation can be included in already existing measurement set-ups increasing their versatility and reducing their uncertainty. It is shown that reliable erbium-doped fiber nonlinearity measurements are possible even for very short fibers when the whole measurement system is carefully characterized for nonlinearity. With the help of the dispersion simulation and a carefully optimized fiber optic power measurement, an expanded uncertainty of 2.0 % (k =2) was achieved for the nonlinearity of a single-mode fiber. The Expanded uncertainty for measurement of an erbium-doped fiber was found to be 3.0 % (k =2). Applied diode laser spectroscopy is covered in the second part of this thesis. External-cavity diode laser based on nondispersive holographic volume grating was designed and characterized in this work. The use of a non-dispersive element for feedback eliminates beam directional variations and enables compact design with good wavelength reproducibility. Laser designs for applications in metrology, molecular spectroscopy and for multicomponent absorption spectroscopy were developed. This thesis describes accurate measurement of temperature and humidity using diode laser spectroscopy, which is crucial for refractive index compensation in demanding interferometric length measurements. The measurement system was tested both in laboratory and outdoor environment successfully over distances up to 130 m. The standard deviation of temperature measurement in laboratory environment was 7 mK using a 120 s sample time, which is the best spectroscopic value ever reported. Performance of the system was found to be excellent when a commercial interferometer was compensated in an environment with local temperature variations, demonstrating the suitability of the method for industrial dimensional measurements. A portable and robust temperature measurement set-up was developed for long-distance geodetic applications. The set-up was tested successfully in harsh outdoor conditions.

AB - This thesis describes work and progress on accurate nonlinearity measurements of optical fibers, design and characterization of external cavity diode lasers, and spectroscopic measurement of air temperature and humidity for accurate determination of the refractive index of air. The first part of the thesis describes measurement of the nonlinear coefficient of standard and erbium-doped singlemode fibers, commonly used in telecommunications. A simulation tool was developed to model the previously neglected effects of dispersion in the continuous-wave self-phase modulation method. The simulation can be included in already existing measurement set-ups increasing their versatility and reducing their uncertainty. It is shown that reliable erbium-doped fiber nonlinearity measurements are possible even for very short fibers when the whole measurement system is carefully characterized for nonlinearity. With the help of the dispersion simulation and a carefully optimized fiber optic power measurement, an expanded uncertainty of 2.0 % (k =2) was achieved for the nonlinearity of a single-mode fiber. The Expanded uncertainty for measurement of an erbium-doped fiber was found to be 3.0 % (k =2). Applied diode laser spectroscopy is covered in the second part of this thesis. External-cavity diode laser based on nondispersive holographic volume grating was designed and characterized in this work. The use of a non-dispersive element for feedback eliminates beam directional variations and enables compact design with good wavelength reproducibility. Laser designs for applications in metrology, molecular spectroscopy and for multicomponent absorption spectroscopy were developed. This thesis describes accurate measurement of temperature and humidity using diode laser spectroscopy, which is crucial for refractive index compensation in demanding interferometric length measurements. The measurement system was tested both in laboratory and outdoor environment successfully over distances up to 130 m. The standard deviation of temperature measurement in laboratory environment was 7 mK using a 120 s sample time, which is the best spectroscopic value ever reported. Performance of the system was found to be excellent when a commercial interferometer was compensated in an environment with local temperature variations, demonstrating the suitability of the method for industrial dimensional measurements. A portable and robust temperature measurement set-up was developed for long-distance geodetic applications. The set-up was tested successfully in harsh outdoor conditions.

KW - nonlinear fiber optics

KW - external-cavity diode lasers

KW - refractive index of air

KW - spectroscopic thermometry

M3 - Dissertation

SN - 978-952-5610-74-1 (PDF)

T3 - MIKES Publication

PB - Centre of Metrology and Accreditation

CY - Espoo

ER -