A dual wavelength erbium doped fibre ring laser employing 3dB coupler and FBGs in preparation for dispersion measurement
- Mthukwane, Clarence M., Grobler, M.F.
- Authors: Mthukwane, Clarence M. , Grobler, M.F.
- Date: 2017
- Subjects: Dual wavelength , Erbium doped fibre , FBG
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/240340 , uj:24725 , Citation: Mthukwane, C.M. & Grobler, M.F. 2017. A dual wavelength erbium doped fibre ring laser employing 3dB coupler and FBGs in preparation for dispersion measurement.
- Description: Abstract: A simple dual -wavelength c-band laser source with the aid of Fibre Bragg gratings (FBG) with an optical SNR of up to 70dB is demonstrated. The laser includes a 3,2m Erbium doped fibre with 11,38dB/m absorption in a ring resonating cavity with optical couplers. The ring cavity had two FBGs centred at 1555.12nm and 1560.32nm attached by a 3dB coupler. A 1m long sagnac loop with 70:30 coupling was used to stabilise the dual wavelength emission to about 2dB. The multiwavelength and narrow spectral width of 0.183nm and 0.195nm of the laser can be used for dispersion measurement in WDM communication links which consist of more than one wavelength. The laser was characterised for dual output power response and power stability. The paper present a characterisation of an Erbium doped fibre (EDF) ring laser. The laser is cost effective and dynamic in selecting preferred components for optimal performance in terms of power and wavelength stability, wavelength selectivity and narrow spectral width. EDF lasers are commercial available and already showing great promise in terms of the formidability and compatibility with current industrial requirements.
- Full Text:
- Authors: Mthukwane, Clarence M. , Grobler, M.F.
- Date: 2017
- Subjects: Dual wavelength , Erbium doped fibre , FBG
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/240340 , uj:24725 , Citation: Mthukwane, C.M. & Grobler, M.F. 2017. A dual wavelength erbium doped fibre ring laser employing 3dB coupler and FBGs in preparation for dispersion measurement.
- Description: Abstract: A simple dual -wavelength c-band laser source with the aid of Fibre Bragg gratings (FBG) with an optical SNR of up to 70dB is demonstrated. The laser includes a 3,2m Erbium doped fibre with 11,38dB/m absorption in a ring resonating cavity with optical couplers. The ring cavity had two FBGs centred at 1555.12nm and 1560.32nm attached by a 3dB coupler. A 1m long sagnac loop with 70:30 coupling was used to stabilise the dual wavelength emission to about 2dB. The multiwavelength and narrow spectral width of 0.183nm and 0.195nm of the laser can be used for dispersion measurement in WDM communication links which consist of more than one wavelength. The laser was characterised for dual output power response and power stability. The paper present a characterisation of an Erbium doped fibre (EDF) ring laser. The laser is cost effective and dynamic in selecting preferred components for optimal performance in terms of power and wavelength stability, wavelength selectivity and narrow spectral width. EDF lasers are commercial available and already showing great promise in terms of the formidability and compatibility with current industrial requirements.
- Full Text:
Embedded fibre bragg gratings to measure shrinkage during the early age of concrete
- Coetzee, W.Z., Van Eck, S., Grobler, M.F., Vannucci, M.J., Bester, J., Martinez Manuel, R.
- Authors: Coetzee, W.Z. , Van Eck, S. , Grobler, M.F. , Vannucci, M.J. , Bester, J. , Martinez Manuel, R.
- Date: 2015
- Subjects: Fibre Bragg grating , Fibre optic sensor
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/69179 , uj:17829 , Citation: Coetzee, W.Z. et al. 2015. Embedded fibre bragg gratings to measure shrinkage during the early age of concrete
- Description: Abstract: The early-age shrinkage of concrete was investigated using optical Fibre Bragg Grating (FBG) strain sensors. Two methods were implemented – a tube and strut mechanical transducer using a FBG sensor and a surface embedded groove FBG sensor. The two sensor methods were compared with a conventional method (Venier caliper), showing that results correlate.
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- Authors: Coetzee, W.Z. , Van Eck, S. , Grobler, M.F. , Vannucci, M.J. , Bester, J. , Martinez Manuel, R.
- Date: 2015
- Subjects: Fibre Bragg grating , Fibre optic sensor
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/69179 , uj:17829 , Citation: Coetzee, W.Z. et al. 2015. Embedded fibre bragg gratings to measure shrinkage during the early age of concrete
- Description: Abstract: The early-age shrinkage of concrete was investigated using optical Fibre Bragg Grating (FBG) strain sensors. Two methods were implemented – a tube and strut mechanical transducer using a FBG sensor and a surface embedded groove FBG sensor. The two sensor methods were compared with a conventional method (Venier caliper), showing that results correlate.
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Preparing for solar challenge: critical competences acquired in undergraduate engineering education
- Janse van Rensburg, N., Grobler, M.F., Clarke, N.
- Authors: Janse van Rensburg, N. , Grobler, M.F. , Clarke, N.
- Date: 2012
- Language: English
- Type: Article:Global Engineering Education Conference (EDUCON)
- Identifier: http://hdl.handle.net/10210/15361 , uj:15652 , Citation:van Rensburg, N.J.; Grobler, M.; Clarke, N.2012. Preparing for the solar challenge: Critical competences acquired in undergraduate engineering education Global Engineering Education Conference (EDUCON), IEEE:1-10. , DOI:10.1109/EDUCON.2012.6201141
- Description: Abstract: Engineers are expected to function in a highly competitive environment, which demands that projects are developed in increasingly efficient and cost-effective ways, across various disciplines. This trend necessitates multidisciplinary collaboration which requires both traditional engineering skills and so called ‘soft skills’, such as good communicative competences and working cooperatively in teams. In this paper it is described how these skills were developed in the course of the University of Johannesburg’s preparation for participation in the biannual Solar Challenge.
- Full Text:
- Authors: Janse van Rensburg, N. , Grobler, M.F. , Clarke, N.
- Date: 2012
- Language: English
- Type: Article:Global Engineering Education Conference (EDUCON)
- Identifier: http://hdl.handle.net/10210/15361 , uj:15652 , Citation:van Rensburg, N.J.; Grobler, M.; Clarke, N.2012. Preparing for the solar challenge: Critical competences acquired in undergraduate engineering education Global Engineering Education Conference (EDUCON), IEEE:1-10. , DOI:10.1109/EDUCON.2012.6201141
- Description: Abstract: Engineers are expected to function in a highly competitive environment, which demands that projects are developed in increasingly efficient and cost-effective ways, across various disciplines. This trend necessitates multidisciplinary collaboration which requires both traditional engineering skills and so called ‘soft skills’, such as good communicative competences and working cooperatively in teams. In this paper it is described how these skills were developed in the course of the University of Johannesburg’s preparation for participation in the biannual Solar Challenge.
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