Trends in opto electro & optical communication (vol4, issue2) by STM Journals Publication

Trends in Opto-Electro & Optical Communication (TOEOC)

ISSN : 2347 â&#x20AC;&#x201C;9957

May-August 2014

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I take the privilege to present the hard copy compilation for the [Volume 4 Issue (2)] 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. Design Optimization of C-Band 4-Channel WDM Optical Communication System using EDFA Refaya Taskin Shama, Nisa Alam, Sadia Yasmin, Md. Sajid Hossain, Rinku Basak

2. Review on Optimization of Wireless Optical Communication System A. Jabeena, T. Jayabarathi, Ratul Aggarwal, Luve Singh

3. Effects of Cavity Length on the Performance Characteristics of InGaN based 420 nm MQW Blue Violet Laser Aniqa Tahsin, Rinku Basak

4. Efficient Data Transmission through Fiber Optic Communication System using SOA Sujan Howlader, Md. Shazzad Hossain, Raja Rashidul Hasan, Rinku Basak

5. Effects of EDFA Parameters on the Performance of A 4-Channel CWDM Optical Communication System Nisa Alam, Rinku Basak

Trends in Opto Electro & Optical Communications ISSN: 2231-0401 (online), ISSN: 2347-9957 (print) Volume 4, Issue 2 www.stmjournals.com

Design Optimization of C-Band 4-Channel WDM Optical Communication System using EDFA Refaya Taskin Shama*, Nisa Alam, Sadia Yasmin, Md. Sajid Hossain, Rinku Basak Dept. of EEE, American International University-Bangladesh, Banani, Dhaka-1213, Bangladesh

Abstract In this work, the design and experimental characterization of high performance C band Erbium Doped Fiber Amplifier (EDFA) booster which is pumped at 980 nm are presented. The system is simulated using Optisystem software to achieve gain flatness of EDF through optimized fiber length and pumping wavelength. The performance of the system is more efficient at the pumping wavelength of 980 nm than that of 1480 nm for a wide range of high pump power. The EDF gain and noise figure have been investigated in terms of varying different parameters of EDF such as numerical aperture, erbium doped fiber radius and pump power in 4 channel wavelength division multiplexing (WDM) system. Simulation results show that the erbium doped fiber gain is more at lower numerical aperture (i.e. 0.35) and at erbium doped fiber radius (2 Îźm). In this simulation maximum gain is 14.72 dB and noise figure is 7.2 dB for 550 mW pump power.

Keywords: EDFA, wavelength division multiplexer, single mode fibers, gain, noise figure, numerical aperture, Erbium doped fiber core radius

Trends in Opto Electro & Optical Communications ISSN: 2231-0401 (online), ISSN: 2347-9957 (print) Volume 4, Issue 2 www.stmjournals.com

Review on Optimization of Wireless Optical Communication System A. Jabeena, T. Jayabarathi, Ratul Aggarwal*, Luve Singh School of Electronics Engineering, VIT University, Vellore, Tamil Nadu, India Abstract Wireless optical communication [WOC] is a recently emerging field, which gives solution for the drawbacks of radio and microwave communication issues. Optical fiber communication has already developed and accepted by its high performance such as high data capacity, speed etc. But WOC experiences atmospheric turbulence problems and distant dependent path loss. And scintillation and aerosol particles (rain, haze, fog and drizzle) bring this major challenge for the WOC system by inducing the atmospheric attenuation and scattering. The optimization of WOC system is required for atmospheric effects, fog attenuation, rain attenuation, physical obstructions, scintillations, building sway, etc. Relaying techniques are the best solution for minimizing the distant dependent loss. The idea of this optical system is so promising that this system can become the required solution to real time communication system. And this has been signified by the increasing sophistication of optical (and infrared) components and techniques, along with rapidly expanding communication requirements. Here we have made a review on various factors related to WOC and analyzed for improving its performance.

Keywords: Wireless optical communication, scattering, atmospheric turbulence, outage probability, scintillation, attenuation, bit error rate *Author for Correspondence E-mail: ratul.aggarwal2011@vit.ac.in

Trends in Opto Electro & Optical Communications ISSN: 2231-0401 (online), ISSN: 2347-9957 (print) Volume 4, Issue 2 www.stmjournals.com

Effects of Cavity Length on the Performance Characteristics of InGaN based 420 nm MQW Blue Violet Laser Aniqa Tahsin*, Rinku Basak Department of Electrical and Electronic Engineering, American International University-Bangladesh, Bangladesh Abstract This research work has been carried out to improve the performance of a MQW blue violet laser to get an efficient and high power output. For this purpose the structure is designed using In0.156Ga0.844N/Al0.07Ga0.93. A high performance of the laser is obtained with the optimized values of injection current and differential gain. A maximum optical output power of 220.3 mW is obtained which enhances the designed laser for the application in data storage, optical discs and displays, printings etc. The laser structure with longer cavity length has the lower optical loss which reduces the optical output power and efficiency. The performance characteristics and their dependence to cavity length of the blue violet laser have been investigated using MATLAB simulation. It was found that lasers having shorter cavity length give better performance and also slope efficiency is higher than the total external quantum efficiency.

Keywords: Cavity length, output power, differential quantum efficiency, total external quantum efficiency

Trends in Opto Electro & Optical Communications ISSN: 2231-0401 (online), ISSN: 2347-9957 (print) Volume 4, Issue 2 www.stmjournals.com

Efficient Data Transmission through Fiber Optic Communication System using SOA Sujan Howlader*, Md. Shazzad Hossain, Raja Rashidul Hasan, Rinku Basak Department of Electrical and Electronic Engineering, American International University-Bangladesh (AIUB), Bangladesh

Abstract This paper represents the characteristic of Semiconductor Optical Amplifier (SOA) by varying frequency of Vertical Cavity Surface Emitting Laser (VCSEL) which is used as a source at the transmitter end and also injection current of SOA. It is observed that by varying the injection current up to 1 ampere, maximum output power of 0.74935 watt can be achieved at the frequency of VCSEL of 193.1 THz when the optical fiber length is 50 Km. By varying the frequency from 177 to 250 THz, maximum output power of 0.10551 watt can be obtained at 240 THz with injection current of 0.15 ampere. In this paper it also observed that SOA can only operates in between the range of 0 to 1 ampere injection current. At 0.042 ampere injection current we get the maximum quality factor of 5.34 with Good BER of 4.67e-8.

Keywords: SOA, vCSEL, optical fiber, BER, Q-Factor

Trends in Opto Electro & Optical Communications ISSN: 2231-0401 (online), ISSN: 2347-9957 (print) Volume 4, Issue 2 www.stmjournals.com

Effects of EDFA Parameters on the Performance of A 4-Channel CWDM Optical Communication System Nisa Alam*, Rinku Basak Dept. of EEE, American International University-Bangladesh, Dhaka-1213, Bangladesh Abstract In this work, the performance of EDFA has been analyzed in Conventional band (C- band) based on its three types of application system i.e. pre-amplifier, post-amplifier and inline amplifier system. To check the performance for these three application system, a 4-channel Coarse Wavelength Division Multiplexing (CWDM) system has been designed using EDFA with optical CWDM fiber. By varying the length and numerical aperture (NA) of EDFA, different factors such as gain, output power has been investigated for the 4 channel CWDM system. The simulation is done using Optisystem 7.0 software. Here forward pumping method is used with 980 nm pumping signal rather than 1480 nm to give more efficient output. Simulation result revealed that the pre amplifier system gives higher gain than the others two systems and the achieved value is 12.735904 dB where the post and inline amplifier gains are respectively found as 7.5988352 dB and 11.893852dB. The maximum output power (18.803 dBm) is obtained for the post amplifier system whereas pre amplifier gives minimum output power (16.565 dBm) and inline amplifier system gives moderate value (17.872 dBm) compared to the other two systems.

Keywords: Erbium doped fiber amplifier, coarse wavelength division multiplexing, gain, output power