International Journal of Computer Applications (0975 – 8887) Volume 110 – No. 13, January 2015 7 A Survey on Performance Analysis of Different Multiplexing Scheme used in Passive Optical Network System Vikas Kumar Mishra M.Tech. Scholar Department of ECE Bhopal Institute of Technology, Bhopal Bramha S.Tripathi Assistant Professor Department of ECE Bhopal Institute of Technology, Bhopal Ambikesh P. Gupta Assistant Professor Department of ECE Bhopal Institute of Technology, Bhopal ABSTRACT In this research Paper review on various multiplexing techniques used for particularly in optical communication to fulfill the demand of modern technology. Sharing of photonics in development of the physical layer within the future web can most likely increase. The photonics leads currently to a more robust usage of the out there information measure, increase within the transmission rate, increase in energy/power capability measured in W/Gbps, etc. In SCM a single link of transmission medium, there'll be many numbers of transmitters is joined. Every transmitter was tempted to sending information and different types of data simultaneously. We have demonstrated a bidirectional Optical fiber system based on a reflective semiconductor optical amplifier (RSOA) using different modulation technique according to the system. The Optical fiber system was modeled and simulated using commercial software, which is Opti-system 7.0 from Optiwave. Keywords: OFDM, OCDMA, SCM, OEO. 1. INTRODUCTION The evolution of electronics and optoelectronic technologies, Microsystems and data technologies, since from three decades, together with a replacement psychological and sociological understanding of the world network, to produce a background for very fast evolutional changes of the Internet [4]. The world network is researched in a very abundant wider context than solely as a complicated technical infrastructure. specific role within the development of the technical, hardware and software system layers play optics, photonics and optoelectronics [5] It looks currently that the photonics, electronics and mechatronics (Microsystems), are going to be ready within the future to make one thing quite solely the advanced technical infrastructure, in a very sort of a totally new reasonably interface of psychological and even physiological nature. It might be a kind of an additional direct interface of human senses to the world network. The mandatory condition is existence of a virtual infrastructure of the throughput none confining the applications, together with quick, period of time transmission of the contents as hi-res 2- D and 3-D pictures. The 100 GB that is near standardization has recently been commercialized [1]. A next logical step, that is inevitable, is that the one Tb/s photonic local area network [2]. This is often associate extension to the quality IEEE 802.3. The backbone network of the longer term net with access links 1Tb/s, that is currently researched, goes into the throughputs of one hundred T bit/s[6]. consecutive step, nowadays still out of reach, may be a network of the throughput reaching four hundred T bit/s and 1Pb/s. nowadays a stable commonplace for one fiber in a very core network, taking into consideration the prices looks ten T bit/s. The throughput of one T bit/s looks conjointly even economically and technically, within the shut future, for major local area network access links. Currently the stress is placed on a deeper „photonization‟ of the net, even full within the future. This stems from the event of the glass fiber communication and every one optical integrated optics processors. This conjointly stems from the massive prices of producing high speed physics, coming into the domain of THz. 2. ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING OFDM (Orthogonal Frequency Division Multiplexing) is extremely engaging theme for affordable and long reach communication. The output inverse fast Fourier transform after (IFFT) in Associate in Nursing OFDM theme is real- valued, that makes the IQ modulation onto Associate in Nursing RF or optical carrier needless, and thus it reduces the system price. As a sort of multi-carrier modulation technique, OFDM shows high spectrum potency, versatile multi-level committal to writing, and obvious tolerance ISI(Inter Sub- Carrier Interference) [1]. A high-order coding theme is often used here. Then the serial complex data is split into parallel streams, and every stream is modulated onto N subcarriers. So as to urge a real-valued time-domain output, a replacement 2N points sequence is made, and also the second N points is that the conjugate sequence of the primary 0.5. Once 2N purpose IFFT, the signaling is of real worth. The cyclic prefix is then inserted for every OFDM image. The generated OFDM signal is had a D/A convertor and afterward used for optical modulation. At the receiver, direct detection is utilized. Once A/D conversion, the cyclic prefix is removed and followed by 2N points FFT. Solely the primary half the 2N points output once FFT is important for signal cryptography. There are some problems in OFDM modulation system. The foremost necessary one is that the high peak-to-average power quantitative relation (PAPR) for multi-carrier modulation. This disadvantage would bring serious distortion within the electrical and optical domains, particularly at the driving power electronic equipment and within the fiber link. It would conjointly cut back the dynamic vary of Associate in Nursing OFDM system [2]. It is documented that OFDM may be a special category of multi-carrier modulation (MCM), a generic implementation of that is delineated in Fig.1. The structure of a complex multiplier factor IQ (modulator/demodulator) that is usually utilized in MCM systems is additionally shown at the lowest of the Fig.1. The key distinction of OFDM from general multicarrier transmission is that the use of orthogonality between the individual subcarriers.