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The design of the code is an important issue in an OCDMA systems, in which it can be constructed in one dimension or multi-dimensions. The two dimensional (2-D) code provides high spectral density and large number of subscribers. In this paper a literature review on noncoherent 2-D code families of OCDMA system is presented. The 2-D code is constructed by spreading the optical pulses in two dimensions...
A new code of optical code division multiple access (OCDMA) based on spectral amplitude coding (SAC) is described and analyzed. The coding technique is called random diagonal ldquoRDrdquo code. One of the important properties of this code is that the cross correlation at data segment is always zero, which means that phase intensity induced noise (PIIN) is reduced. From the construction of RD code...
We apply the arrayed waveguide grating (AWGs) method for encoder and decoder design for complete transmitter and receiver system. The encoder and decoder module will be using the AWG to encode and to decode optical source into useful signal to carry the data and transmit it using a single optical fibre. This module was designed to suite the zero cross correlation (ZCC) code. In this paper the study...
Encoder and decoder modules of OCDM system using fiber Bragg grating (FBG) is presented in this paper. In OCDM system, the unique code sequence is formed by using spectral components which are inherently arranged. This is done by multiplexing the Bragg wavelengths from an array of FBGs. The effects of FBG as encoder and decoder modules to the system performance are studied. The code used in this project...
In this paper we study the use of a new code called Random Diagonal (RD) code for Spectral Amplitude Coding (SAC) optical Code Division Multiple Access (CDMA) networks, using Fiber Bragg-Grating (FBG), FBG consists of a fiber segment whose index of reflection varies periodically along its length. RD code is constructed using code level and data level, one of the important properties of this code is...
When mapping is applied for the double weight code family to increase the number of users, for spectral amplitude coding optical code division multiple access (SAC OCDMA) systems, the conventional complementary detection technique cannot be used to retrieve the intended signal because of the unfixed cross-correlation value between different code sequences. This paper studies the software simulation...
This paper presents a development of 125 KHz ubiquitous RFID tag signal detector system that can be used as a door lock for home security. The RFID tag signal detector or also known as RFID reader consists of three elements which are the RFID reader, RF antenna and transponder (tag). The reader is a device that generates the digital pulse code required to activate the transponder and also designates...
In this paper the double weight code (DW) family which is used as a proposed code in optical spectral code division multiple access system (OSCDMA) has been studied using the modified double weight code (MDW) which has across correlation value equals to one. By eliminating the intersection columns of this code we can reduce the cross correlation value from one to zero. This code is named zero cross-correlation...
This project concentrates on the design of Fiber Bragg Grating (FBG) based encoder and decoder modules for Spectral Amplitude Coding of Optical Code Division Multiple Access (SAC-OCDMA) system. In SAC-OCDMA system, the unique code sequence is formed by using spectral components which are inherently arranged. This is done by multiplexing the Bragg wavelengths from an array of FBGs. However, the Bragg...
This project concentrates on the effects detection technique to the system performance of spectral amplitude coding optical code division multiple access (SAC- OCDMA). The system employed the encoder and decoder modules based on the fiber Bragg gratings (FBGs) to generate the unique code sequences for the users. These modules are basically designed for the modified double weight (MDW) code which allows...
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