International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 11 | Nov 2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1665 Optimizing Different Parameters of Inter-Satellite Optical Wireless Communication (Is-OWC) System by Incorporating Mach Zehnder Interferometer (MZI) with Duobinary Modulation Technique Priya Sharma 1 , Santosh Meena 2 1 M. Tech Scholar, Department of Electronics and Communication Engineering. Government Women Engineering College, Ajmer, Rajasthan, India 2 Asst. Professor, Department of Electronics and Comm. Engineering. Government Women Engineering College, Ajmer, Rajasthan, India ---------------------------------------------------------------------***---------------------------------------------------------------------- Abstract - High speed data transmission for long distance is the main motive of today’s as well as for next generation communication system. Inter-satellite communication provides the superior result with Optical Wireless Communication (OWC) technology. Duobinary encoding technique provides the highly efficient result for long distance communication with data security. In this paper, we designed a system to communicate two or more satellites using Duobinary modulation technique with Mach Zehnder Interferometer (MZI). The performance of system is analyzed by OPTISYSTEM 7.0 software for bit rate up to 100 Gbps for 8000-kilometer distance with transmitting power of 20 dBm and result shown in the form of BER, Q-factor and eye diagram obtained. Keyword: Is-OWC, ISL, duobinary encoding technique, Q- factor, BER 1. INTRODUCTION High data rates with large coverage area is achieved by optical wireless communication (OWC) system. In 1945, Arthur C. Clarke was first author who gave the idea of satellites. In March 2003, Artemis and SPOT4 was the first Inter-satellite communication using optical link [1]. For global coverage link established between satellites to reduce recurrence. NRZ, AMI, Duobinary are the modulation technique. In 1990s, duobinary encoding technique was applied with optical signal. There are many benefits to use duobinary encoding technique like high spectral efficiency with improving channel capacity utilization. As we, analyzed in previous paper, duobinary encoding technique provides the superior result with diversity technique at high pointing error. Thus, duobinary encoding technique is also used for long haul communication. Radio frequency (RF) waves used as conventional technique for communication purpose which having some limiting issues like interference, fixed bandwidth, license requirement and so on. Thus, for high speed data transmission between different satellites which revolve either in the same orbit or in different orbits OWC provides the superior result. To improve the Is-OWC system performance with global coverage different types of techniques have been studied and analyzed by researchers. To reduce the degrading issues beacon signal which is transmitted from transmitter and receiver antenna for getting the proper position of transmitter and receiver satellites. Thus, optical beacon signal is one of the important factors to reduce the limiting factor and for getting the proper line of sight (LOS) [2]. Similarly, spatial channel- based diversity technique also provides the excellent result at 100 Gbps for 10000 km distance at large pointing error up to 3 µrad with duobinary encoding technique [3]. While, space and polarization-based diversity provide result at 6000 km for transmitting 7.63 data rate [4]. So, channel diversity technique is also used for transmitting high speed data at large distance to mitigate the degrading issues [5]. Polarization interleaving (PI) with AMI and NRZ modulation technique also effective technique for transmitting large data [6]. In this paper, we analyzed the performance of duobinary encoding technique with Mach Zehnder Interferometer (MZI) at different parameters of system. Duobinary encoding technique is the method for high speed data transmission at large distance. It provides effective and efficient signal in compare to NRZ encoding technique [7]. Similarly, Mach Zehnder Interferometric devices like switching, multiplexing, modulators, or as optical filters used in different applications purposes [8]. In this, MZI filter transmits the high-speed information by removing unwanted optical domain signal and enhance the performance of system. MZI optical filter defined their frequency response in terms of magnitude and phase of incoming signal which is modified by filter [9]. This paper further defined the section as follows: section II defined the proposed system, section III discussed the result at different parameters by using proposed model and section IV conclude the paper. 2. SYSTEM DESCRIPTION In proposed model fig.1 which is based on duobinary encoding technique by integrating Mach Zehnder Interferometer (MZI) in OPTISYSTEM 7.0 software. In Is-OWC system designing, up to 100 Gbps data is transmitted with 1550 nm wavelength at 20 dBm power level. In fig.1 designing is free from component complexity and based on single channel of OWC at large distance up to 8000 kilometer and 1.1 µrad pointing error.