Volume 2
- Number 2 (2009)
Volume 3
- Number 1 (2010)
- Number 2 (2010)
Volume 4
- Number 1 (2011)
- Number 2 (2011)
Volume 5
- Number 1 (2012)
- Number 2 (2012)
Volume 6
- 2013
Volume 7
Volume 8
- Number 1 (2015)
- Number 2 (2015)

CALL FOR PAPERS YEAR 2017

IMPORTANT DATES:
Submission Due Date: May 12, 2017
Notification to Authors: May 31, 2017
Journal Publication: July 15, 2017 onwards


EDITORIAL BOARD

Journal of Engineering & Technological Advances
Chief Editor:
Dr. Chia Chee Ming
Deputy Chief Editor:
Dr. Leelavathi Rajamanickam
Editors:
Prof. Omar Munir
Dr. Yap Pow Seng
Pn. Salmaliza Salleh
Mr. Chen Woon Choong
Ms. Kate Lam Woon Yee
 
Asia Pacific Journal of Health Sciences Research
Chief Editor:
Dr Neeraj Malhotra
Deputy Chief Editor:
Prof. Dr. Jamaludin Zainol
Editors:
Datuk Dr Khairiyah Abd Muttalib
Prof. Dr Nyan HL
Assoc. Prof. Tey Kim Kuan
Assoc. Prof. Ong Bee Leng
 
Asia Pacific Journal of Business, Humanities & Education
Chief Editor:
Dr. Mahiswaran Selvanathan
Deputy Chief Editor:
Assoc. Prof. Dr. Stanley Yap
Editors:
Assoc. Prof. Dr. Firdaus Low Abdullah
Dr. Mahadevan Supramaniam
Dr. Chong Wei Ying
Dr. Ramachandran Ponnan
 
 
EFFECT OF USING AN OPTICAL AMPLIFIER IN SELF-HETERODYNE DETECTION
Author : R.M. Manimaran, H. A. Abdul-Rashid
Formats available : Flipbook (English)
You have : FREE Access
 
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Abstract
The self-heterodyne detection technique has been commonly used in the determination of optical linewidths of lasers. As the linewidth of a laser decreases, the resulting high resolution makes it a very useful tool for linewidth measurements using the self-heterodyne technique. The fiber length to be used in the system and its effect on the overall measurements of linewidths have been researched extensively. As modern day lasers are capable of generating very narrow linewidths, the fiber length to be used in the self heterodyne system to measure the linewidth becomes very long. When very long optical fibers are used, we can expect the spectrum Signal to Noise Ratio (SNR) to degrade due to fiber non linearity, dispersion and losses. To offset some of these effects, especially the attenuation, we will be tempted to add an optical amplifier in the loop but an amplifier also introduces noise of its own. This paper is concerned with studying the effect of using an amplifier in a self- heterodyne system to improve the SNR. The results obtained show that an optical amplifier does not broaden the laser linewidth but contributes mainly to white noise that affects the wings of the spectrum. An improvement of about 5 dB in spectrum peak was observed when a 10 dB amplifier was used in the system.
 
Authors(s) Affiliations
SEGi College Subang Jaya, Subang Jaya, Malaysia; Multimedia University, Cyberjaya, Malaysia.