School of Engineering and Technology: Recent submissions
Now showing items 41-60 of 115
-
All-Optical VCSEL-to-VCSEL Injection Based on Cross Gain Modulation for Routing in Multinode Flexible Spectrum Optimization in Optical Fibre Transmission Links
(Hindawi, 2019)In this paper, we experimentally present a novel, all-optical spectral efficient vertical-cavity surface-emitting laser- (VCSEL-) based technique for routing and spectrum assignment in optical networks. Exploiting all ... -
Modelling of an Optical Fibre Raman Amplifier
(2012)The transmission of signals in long-haul optical fibre systems requires signal amplification. Raman amplification is based on SRS and it requires a frequency shift of 13.2 THz provided by signal and pump wavelengths of ... -
Comparison of PMF and LEAF as Optical Fibre Stress and Temperature Sensing Elements
(2013)We experimentally investigate the sensitivity of PMF and LEAF fibre. The design of a stress sensor gave the best sensitivity of 0.051 kg -1 while that of a temperature sensor, gave the best sensitivity of 0.181 0C1 -
Forward Raman Amplification Characterization in Optical Networks
(2014)Optical networks that apply the technology of dense wavelength-division multiplexing (DWDM) have recently resulted in a considerable increase in existing telecommunications infrastructures. They are expected to play a ... -
An all Optical VCSEL Wavelength Conversion for Optical Fibre Access Networks
(Research Gate, 2016)A cheap, scalable and efficient optical wavelength conversion and optical path switching technique for access networks is experimentally demonstrated. Wavelength conversion is used in wavelength division multiplexed (WDM) ... -
Modeling of ring resonators as optical Filters using MEEP
(2016)Ring Resonators are key component in modern optical networks. Their size allows high density integration in optical photonic circuits due to the use of high index contrast. Ring Resonators based filters in wavelength ... -
Effects of Polarization Mode Dispersion (PMD) on Raman Gain and PMD Measurement using an Optical Fibre Raman Amplifier
(IEEE, 2013-09-09)We experimentally investigate the effects of increase of the differential group delay (DGD) on Raman gain and gain value. It was found that the increase of DGD values lead to the formation and the increase in the number ... -
A 1550 nm All-Optical VCSEL-to-VCSEL Wavelength Conversion of a 8.5 Gb/s Data Signal and Transmission over a 24.7 km Fibre
(International Society for Optics and Photonics, 2017)For the first time, we demonstrate, VCSEL-to-VCSEL wavelength conversion within the low attenuation 1550 nm transmission window, including transmission over fibre and bit error rate (BER) performance characterization. ... -
General Circulation Models (GCMs) Downscaling Techniques and Uncertainty Modeling for Climate Change Impact Assessment
(Proceedings of 2013 Mechanical Engineering Conference on Sustainable Research and Innovation, 2013)Scientific literature on the assessment and projection of climate change impacts suggests that the rapidly changing climate conditions are causing far-reaching consequences on natural resources and agricultural production. ... -
SWAT model parameter calibration and uncertainty analysis using the HydroPSO R package in Nzoia Basin, Kenya
(Journal of Sustainable Research in Engineering, 2014)The parameter uncertainty in hydrological modelling has been accorded much attention in the recent past.Parameter uncertainty is a major source of overall model unreliability. In this study, the HydroPSO R package was used ... -
A Prototype for Authentication of Secondary School Certificates: A Case of Kenya Certificate of Secondary Education
(International Journal of Innovative Research and Knowledge, 2017)The demand for educated labor force has increased in developing countries like Kenya. Owing to this fact, more often Universities and training colleges in Kenya enroll students who want to further ... -
The Dependency of Bus Voltage and Frequency in Load Shedding
(Proceedings of Sustainable Research and Innovation Conference, 2014)—Load shedding schemes proposed in literature so far use voltage and frequency parameters separately. The individual consideration of these indices may not be reliable or effective, and may even lead to the over load ... -
Noise Figure and Pump Reflection Power in SMF-Reach Optical Fibre for Raman Amplification
(2015)We investigate both experimentally and by simulation the Noise Figure (NF) and pump reflection power of a Distributed Fibre Raman Amplifier (DFRA) as a function of pump power and fibre length, at ... -
Signal monitoring and performance stability evaluation tool in a high speed optical communication network
(2016-10)The diverse communication systems in South Africa have changed drastically over the last few years and are envisioned to continue to improve as evidenced by the deployment of high speed optical fibre networks, in both ... -
Reward and Compensation as a Determinant of Employee Commitment: A Survey of Ktda Tea Factories in Kenya
(2014)The purpose of this study was to investigate the determinants of employee commitment in tea organizations in Kenya. Strong commitment is correlated with high productivity, while low commitment lowers productivity. ... -
THE EFFECT OF FINE NON-METALLIC INCLUSIONS ON THE FATIGUE STRENGTH OF STRUCTURAL STEEL
(2015)The article discusses the results of a study investigating the effect of the number of fine non-metallic inclusions (up to2μm in size) on the fatigue strength of structural steel during rotary bending. The study was performed ... -
Emission Constrained Economic Dispatch Using Moth Flame Optimization and Bat Hybrid Algorithm
(International Journal of Engineering Research and Technology, 2018)This paper presents the application of a novel Moth flame optimization and Bat hybrid algorithm in the area of emission constrained economic dispatch with the main goal of minimizing the total cost of electric generation ... -
Short Term Load Forecasting Using Artificial Neural Networks
(Proceedings of 2013 Mechanical Engineering Conference on Sustainable Research and Innovation, 2013)Load forecasting refers to the prediction of future load conditions based on present or historical data. This is important especially for transmission planning and economic dispatch. In this paper, an Artificial Neural ... -
THIN LAYER DRYING KINETICS OF AMARANTH (Amaranthus cruentus) GRAINS IN A NATURAL CONVECTION SOLAR TENT DRYER
(2010-03)An experimental solar tent dryer under natural convection was used to study thin layer drying kinetics of amaranth (Amaranthus cruentus) grains. Drying of grains in the dryer was carried out on a drying rack having two ... -
An Automatic Number Plate Recognition System for Car Park Management
(International Journal of Computer Applications, 2017)Automatic Number Plate Recognition (ANPR) is an internationally recognized methodology that is used in vehicle identification. ANPR systems allow for real time recognition of a vehicle’s number ...
