Trends in opto electro & optical communication(vol4, issue1) by STM Journals Publication

Trends in Opto-Electro & Optical Communication (TOEOC)

ISSN : 2347 â&#x20AC;&#x201C;9957

Jan - April 2014

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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 writeups/ 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

Trends in Opto Electro & Optical Communication

Contents

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

3. 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

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

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 1

H. M. Savitha1*, Muralidhar Kulkarni2

St. Joseph Engineering College, Mangalore, Karnataka, India National 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

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

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 4Ă&#x2014;10-16 cm2 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

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