ISSN : 2347 –9957

Trends in Opto-Electro & Optical

Communication(TOEOC)

Jan - April 2014

STM JOURNALSScientific Technical Medical

STM Publication, a strong initiative by Consortium E-Learning Network Private ltd.(Estd. 2006) was launched in the

year 2010 under the support and guidance by our esteemed Editorial and Advisory board members from renowned

institutes.

Objectives of STM Publication(s):

?Scientific, Technical and Medical research promotions.

?Publication of genuine Research/Review, Short Articles and Case Studies through proper review

process.

?Publishing Special Issues on Conferences.

?Preparing online platform for other print Journals.

?Empowering the libraries with online and print Journals in Scientific, Technical and Medical

domains.

?Publishing and distribution of books on various subjects which mainly falls in the category of

Nanotechnology, Scientific and technical writing & Environment, Health and Safety.

Salient Features:

?A bouquet of 100+ Journals that fall under Science, Technical & Medical domains.

?Employs Open Journals System (OJS) A Journal Management & Publishing System.

?The first and one of the fastest growing publication website in India as well as in abroad for its quality

and coverage.

?Rapid online submission and publication of papers, soon after their formal acceptance/ finalization.

?Facilitates linking with the other authors or professionals.

?Worldwide circulation and visibility.

Focus and Scope Covers

is published (frequency: three times a year) in India by STM Journals

(division of Consortium e-Learning Network Private Ltd. Pvt.) The views expressed in the articles do not necessarily

reflect of the Publisher. The publisher does not endorse the quality or value of the advertised/sponsored products

described therein. Please consult full prescribing information before issuing a prescription for any products mentioned in

this publication.

No part of this publication may be reproduced, stored in retrieval system or transmitted in any from without written

permission of the publisher.

To cite any of the material contained in this Journal, in English or translation, please use the full English reference at the

beginning of each article. To reuse any of the material, please contact STM Journals (info@stmjournals.com)

Trends in Opto Electro & Optical Communication

Trends in Opto Electro & Optical Communication

(ISSN: 2347-9957)

?Enabling Technologies & applications in Optical Networks

?Survivability, Reliability & Security of Optical Networks

?Signaling and Information Models for Network Control & Management

?Architecture, Protocols & Algorithms for Dynamic Optical Networks

? Fiber-Optic Networks

?Advanced DSLTechnologies on Fiber-to-the-Home Architectures

? Operations support systems for optical network

STM Publication(s)

STM Journals (division of Consortium e-Learning Network Private Ltd. ) having its Marketing office located at Office

No. 4, First Floor, CSC pocket E Market, Mayur Vihar Phase II, New Delhi-110091, India is the Publisher of Journal.

Statements and opinions expressed in the Journal reflect the views of the author(s) and are not the opinion of STM

Journals unless so stated.

Subscription Information and Order:

Cost of Journal:

? National Subscription: Rs. 3750/- per Journal (includes 3 print issues), Single Issue copy purchase Rs.1500/copy

? International Subscription:

? Online Only- $99, Print Only-$149 (includes 3 print issues)

? Online + Print-$199 (includes 3 print issues + online access of published back volumes )

To purchase print compilation of back issues please send your query at info@stmjournals.com

Subscription must be prepaid. Rates outside the India includes speed delivery charges. Prices subject to change

without notice.

Mode of Payment: At par cheque, Demand draft, and RTGS (payment to be made in favor of

Consortium E-Learning Network. Pvt. ltd., payable at Delhi/New Delhi.

Online Access Policy

A). For Authors:

In order to provide maximum citation and wide publicity to the authors work, STM Journals also have Open Access

Policy, authors who would like to get their work open access can opt for Optional Open Access publication at

nominal cost as follows

India, SARC and African Countries: INR 2500 or 100 USD including single hard copy of Author's Journal.

Other Countries: USD 200 including single hard copy of Author's Journal.

B). For Subscribers:

? Online access will be activated within 72 hours of receipt of the payment (working days), subject to receipt of

correct information on user details/Static IP address of the subscriber.

? The access will be blocked:

? If the user requests for the same and furnishes valid reasons for blocking.

? Due to technical issue.

? Misuse of the access rights as per the access policy.

Advertising and Commercial Reprint Inquiries: STM Journals with wide circulation and visibility offer an excellent

media for showcasing/promotion of your products/services and the events-namely, Conferences, Symposia/Seminars

etc. These journals have very high potential to deliver the message across the targeted audience regularly with each

published issue. The advertisements on bulk subscriptions, gift subscriptions or reprint purchases for distribution etc. are

also very welcome.

Lost Issue Claims: Please note the following when applying for lost or missing issues:

? Claims for print copies lost will be honored only after 45 days of the dispatch date and before publication of the

next issue as per the frequency.

? Tracking id for the speed post will be provided to all our subscribers and the claims for the missing Journals will

be entertained only with the proofs which will be verified at both the ends.

? Claims filed due to insufficient (or no notice) of change of address will not be honored.

? Change of Address of Dispatch should be intimated to STM Journals at least 2 months prior to the dispatch

schedule as per the frequency by mentioning subscriber id and the subscription id.

? Refund requests will not be entertained.

Legal Disputes

All the legal disputes are subjected to Delhi Jurisdiction only.

If you have any questions, please contact the Publication Management Team:

info@stmjournals.com; Tel : +91 0120-4781211.

Chairman

Mr. Puneet Mehrotra

Managing Director STM Journals, Consortium eLearning Network Pvt. Ltd.(CELNET)

Noida ,India

Group Managing Editor Dr. Archana Mehrotra

DirectorCELNET, Delhi, India

Puneet Pandeya

ManagerMonika Malhotra

Assistant Manager

Assistant Editors

Aditya Sanyal

Himani Garg

Himani Pandey

Publication Management Team

Internal Members

External Members

Dr. Bimlesh Lochab

Industrial Tribology Machine Dynamics & Maintenance

Engineering Centre (ITMMEC)

Indian Institute of Technology Delhi, India.

Prof. S. Ramaprabhu

Alternative Energy Technology Laboratory,

Department of Physics,

Indian Institute of Technology, Chennai, India.

Dr. Rajiv Prakash

School of Materials Science and Technology,

Institute of Technology, Banaras Hindu University,

Varanasi, India.

Dr. Rakesh Kumar

Assistant Professor, Department of

Applied Chemistry, BIT Mesra,

Patna, India.

Associate Editors

Gargi Asha Jha

Nupur Anand

Priyanka Aswal

Sona Chahal

STM Journal (s) Advisory Board

Dr. Ashish RunthalaLecturer, Biological Sciences Group,

Birla Institute of Technology & Science, Pilani Rajasthan, India.

Dr. Baldev RajDistinguished Scientist & Director,

Indira Gandhi Centre for Atomic Research

(ICGAR)Kalpakkam, India.

Dr. Baskar KaliyamoorthyAssociate Professor, Department

of Civil Engineering National Institute of Technology Trichy, India.

Prof. Bankim Chandra RayProfessor and Head, Department of

Metallurgical and Materials Engineering National Institute of Technology,

Rourkela, India.

Prof. D. N. Rao Professor, Department of Biochemistry,

AIIMS, New Delhi, India.

Prof. Jugal KishoreProfessor, Department of Community

Medicine, Maulana Azad Medical College, New Delhi, India.

Dr. Pankaj PoddarScientist, Physical & Materials ChemistryDivision, National Chemical Laboratory,

Pune, India.

Dr. Hardev Singh VirkProfessor Emeritus, Eternal

University, Baru Sahib, India.

Dr. Nandini Chatterjee SinghAssociate Professor,

National Brain Research Centre, Manesar, India.

Dr. Shankargouda PatilAsst. Prof., Department of Oral

Pathology, KLE Society's Institute of Dental Sciences, Bangalore, India.

Prof. Subash Chandra MishraProfessor, Metallurgical & Materials

Engineering Department, NIT, Rourkela, India.

Prof. Sundara RamaprabhuProfessor, Department of Physics

Indian Institute of Technology Madras, India.

Dr. Shrikant Balkisan DhootHead Research & Development,

Nurture Earth R&D Pvt LtdMIT Campus, Beed bypass road,

Aurangabad, India.

Dr. Rakesh KumarAssistant Professor,

Department of Applied Chemistry, BIT Mesra, Patna, India.

Dr. Priyavrat TharejaHead, Materials and Metallurgical

Engineering department, PEC University of Technology,

Chandigarh, India.

STM Journal (s) Advisory Board & Editorial Board

Dr. Rajat Kumar SinghAsst. Prof., Indian Institute of

Information Technology, Allahabad, India.

Mr. Mohammad Nasir UddinAsst. Prof., Faculty of Engineering American International University-Bangladesh (AIUB), Bangladesh.

Dr. Kallol BhattacharyaAssoc. Prof., University of

Calcutta, India.

Dr. Anirudh BanerjeeSenior Lecturer, Amity School of Engg.

and Technology, Amity University, Lucknow, U.P., India.

I take the privilege to present the hard copy compilation for the [Volume 4 Issue (1)] of Trends in

Opto Electro & Optical Communication (TOEOC).The intension of TOEOC is to create an

atmosphere that stimulates creativeness, research and growth in the area of Opto Electro & Optical

Communication.

The development and growth of the mankind is the consequence of brilliant Research done by

eminent Scientists and Engineers in every field. TOEOC provides an outlet for Research findings

and reviews in areas of Trends in Opto Electro & Optical Communication found to be relevant

for National and International recent developments & research initiative.

The aim and scope of the Journal is to provide an academic medium and an important reference for

the advancement and dissemination of Research results that support high level learning, teaching and

research in the domain of Opto Electro & Optical Communication.

Finally, I express my sincere gratitude and thanks to our Editorial/ Reviewer board and Authors for

their continued support and invaluable contributions and suggestions in the form of authoring write-

ups/ reviewing and providing constructive comments for the advancement of the journals. With

regards to their due continuous support and co-operation, we have been able to publish quality

Research/Review findings for our customers base.

I hope you will enjoy reading this issue and we welcome your feedback on any aspect of the Journal.

Dr. Archana Mehrotra

Director

STM Journals

Director's Desk

STM JOURNALS

1. BER Performance Comparison of Coded Communication Systems under Different Turbulence Coditions of Free Space Optical Channel H. M. Savitha, Muralidhar Kulkarni 1

2. WDM Transmission for Free Space Optics under Different Atmospheric Conditions Ibrahim Khalil, Atanu Biswas, Rakibul Bari Rakib, Md. Abu Sayeed, Md. Sohel Mahmud She 7

3. Effects of Variation of Differential Gain and Injection Current on the Performance Characteristics of the Designed 405 nm MQW Violet LaserFarhan Ahmed Chowdhury, Rinku Basak 13

4. Performance Enhancement of Laser based Modern Railway Mobile Platform Crossing SystemMd. Ashiquzzaman, Rinku Basak 23

ContentsTrends in Opto Electro & Optical Communication

Trends in Opto Electro & Optical Communications ISSN: 2347-9957 Volume 4, Issue 1

www.stmjournals.com

BER Performance Comparison of Coded Communication Systems under Different Turbulence Coditions of Free

Space Optical Channel

H. M. Savitha1*, Muralidhar Kulkarni2 1St. Joseph Engineering College, Mangalore, Karnataka, India

2National Institute of Technology Karnataka, Surathkal, Karnataka, India

Abstract The congestion and the limitations on bandwidths of the radio spectrum have posed a constraint for the growth of radio wireless systems. Wireless optical communication, also known as free space optical communication (FSO), is believed to be a long-term option for many wireless communication applications. Atmospheric turbulence is generally considered to be multiplicative noise source that reduces the capability of receiver to estimate the information contained in the modulated optical wave. This paper gives a comparative study of the behavior of the turbo/LDPC/convolutional-coded FSO system under different turbulence conditions. From the simulation results, it is clear that the turbo codes and LDPC codes are most suitable schemes for handling all the three cases of turbulences. They also provide a very good coding gain resulting in very low SNR requirements. Keywords: Free space optics, FSO channel, turbulence, turbo code, LDPC code

TOEOC (2014)© STM Journals 2014. All Rights Reserved

TOEOC (2013)© STM Journals 2014. All Rights Reserved

Trends in Opto-electro & Optical Communications ISSN: 2347-9957

Volume 4, Issue 1

www.stmjournals.com

WDM Transmission for Free Space Optics under

Different Atmospheric Conditions

Ibrahim Khalil, Atanu Biswas, Rakibul Bari Rakib, Md. Abu Sayeed,

Md. Sohel Mahmud Sher* Electronics and Communication Engineering Discipline, School of Science, Engineering, and

Technology, Khulna University, Khulna-9208, Bangladesh

Abstract This paper presents the design and simulation of a 32-channel WDM transmission system

for free space optics (FSO) taking different atmospheric effects (rain, fog and

scintillation) into account. The commercial software, namely, OptiSystem is used for the design of WDM-FSO where the system performances are evaluated in terms of bit error

rate (BER) and eye diagrams. Weather data of Khulna, a district in the south-western

part of Bangladesh, is used to calculate the FSO channel attenuation due to rain while the attenuations due to fog and scintillation are adopted from literature. Simulation

results show that 32-channel WDM-FSO link can reach up to 3.2 km under rainy weather conditions with input power and transmission speed of 10 dBm and 2.5 Gbps respectively

for each channel. The maximum link distances are found to be 95 m and 950 m for the

atmospheric attenuation due to dense fog and high turbulence respectively.

Keywords: Free space optics, wavelength division multiplexing, bit error rate, eye

diagram, optical communication

TOEOC (2014)© STM Journals 2014. All Rights Reserved

Trends in Opto Electro & Optical Communications ISSN: 2347-9957

Volume 4, Issue 1

www.stmjournals.com

Effects of Variation of Differential Gain and Injection

Current on the Performance Characteristics of the

Designed 405 nm MQW Violet Laser

Farhan Ahmed Chowdhury*, Rinku Basak Department of Electrical and Electronic Engineering, American International University Bangladesh

(AIUB), Dhaka, Bangladesh

Abstract In this work the Designing and Performance Analysis of a 405 nm InGaN based multi

quantum well (MQW) Violet Laser have been presented. The internal designing of 405nm

Violet Laser has been done with appropriate calculation. The desired wavelength of 405nm was obtained by adjusting the exact concentration of In0.0979Ga0.9021N /

Al0.07Ga0.93N. The effects on Rate Equations by varying the differential gain and Injection current have been observed. Also the optimization of the Performance Parameters for

Maximum Output Power and Modulation response are presented here. For the desired

wavelength of 405 nm with Injection current of 120 mA, Threshold Current of 8.7 mA and differential gain of 4×10

-16 cm

2 the output power has obtained 228.5 mW. For better

Performance of Violet Laser Differential Quantum Efficiency has been calculated

67.02%. A key feature of this work is the extensive use of MATLAB. All modification of the designs, comparisons and performance analysis were proposed in this work by using

MATLAB. All the simulations, optimization, calculation have been done in room temperature of 300 K.

Keywords: Differential Gain, injection current, output power, resonance frequency,

modulation bandwidth, MQW violet laser

TOEOC (2014)© STM Journals 2014. All Rights Reserved

Trends in Opto Electro & Optical Communications ISSN: 2347-9957

Volume 4, Issue 1

www.stmjournals.com

Performance Enhancement of Laser based Modern

Railway Mobile Platform Crossing System

Md. Ashiquzzaman*, Rinku Basak

Department of EEE, American International University-Bangladesh, Dhaka, Bangladesh

Abstract In this work, the modern railway mobile platform crossing system is improved through

the proper computation of GaInP based 635 nm multiple quantum well red laser maintaining the perfect peak intensity of the power which is achieved at 635 nm. By

analyzing the performance of the designed Ga0.5In0.5P/ (Al0.5Ga0.5)0.5In0.5P edge emitting

laser the peak material gain is obtained. Sustaining threshold current of 6.7 mA, a maximum resonance frequency of 10 GHz has been obtained for the designed laser at

90 mA injection current at 300 K temperature. With the increase of injection current the

designed red laser can supply more power. So the use of this improved powered laser can

make more secured modern railway mobile platform crossing system.

Keywords: Laser diode, injection current, red laser, railway mobile platform

crossing system