Study And Analysis Of Power Attenuation Due To Optical Bend Loss In OPGW Overhead Transmission In Malaysia

Mohamad Salleh, Mohamad Fazli (2016) Study And Analysis Of Power Attenuation Due To Optical Bend Loss In OPGW Overhead Transmission In Malaysia. Masters thesis, Universiti Teknikal Malaysia Melaka.

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Abstract

This thesis presents a study in detecting the optical fiber bending on long distance Optical Ground Wire (OPGW) using Optical Time-Domain Reflectometer (OTDR) in order to eliminate the bend loss and improve the optical power attenuation. This thesis also present the investigation and analysis of the performance and characteristic of bend loss and optical power attenuation for OPGW over a long period of time as well as to validate the impact of bend loss on optical fiber attenuation through experimental works on site. Bending fiber optic is important to be detected because a fiber optic that has a bending radius smaller than its critical radius will attenuate optical power and cause the data sent through the fiber optic to be partially lost or totally lost. The study involved the process of collecting optical fiber data that provided by Tenaga Nasional Berhad (TNB) for a period of 10 months. This research is the first effort of its kind where data from actual OPGW are collected and presented to the public. All data were obtained from the existing 54.554 km OPGW laid from Main Substation 275kV Batu Pahat Timur (BPHE) to Main Substation 275kV Yong Peng Utara (YGPN). Two different data sets were obtained from this optical fiber, which are optical power attenuation and point of optical power loss, using the Power Meter test and OTDR test respectively. The analysis study is presented in this thesis and the study to detect the presence of bending optical fiber involves several processes, such as measuring the optical power attenuation, detecting the point of optical power loss and comparing the loss value of different wavelengths, 1310 nm and 1550 nm. In this thesis, the study on bend losses and power attenuation of optical fiber led to the discovery of the relationship between bend losses due to the bending of optical fiber, with the attenuation of fiber. From the experiment designed in this study, the effects of permanent bending on loss and attenuation is discovered as well as the discovery that the bending of optical fiber can occur naturally over time and the value of losses are varied with significant effects when the level of wavelength increased. From the analysis, the location of the bending fiber optic is identified and it is found that the actual location of bending optical fiber is in agreement with the analysis result. Once the location of the bending fiber optic have been found, the bending optical fiber is then released to observe the effect of that bending on optical power loss. The main benefit of this study is that the location of the bending fiber optic can be detected using OTDR and the ability to compare wavelengths at a particular point. The results also found that the quality of optical fiber decreases at 0.19 dB for 1310 nm and 4.85 dB for 1550 nm after a period of monitoring due to bending that occurs naturally but fortunately, it does not give a permanent effect at the point bending where after rectification, the quality has improved at 0.49 dB for 1310 nm and 7.17 dB for 1550 nm. It is also found that bend loss kept occurring and scattered at several points. This study of detecting bending fiber optic is suitable and an alternative solution to overcome the problem of reduced fiber optic performance for long distance fiber optic cable in a long period of time.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Optical fibers, Measurement, OPGW
Subjects:	T Technology > T Technology (General) T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Library > Tesis > FKEKK
Depositing User:	Muhammad Afiz Ahmad
Date Deposited:	31 Mar 2017 01:31
Last Modified:	08 Oct 2021 13:16
URI:	http://eprints.utem.edu.my/id/eprint/18374
Statistic Details:	View Download Statistic

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