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This paper present 3 design of array antenna from type of inset-fed microstrip patch antenna oriented at 45deg and -45deg. The antenna is capable to generate dual-polarization radiation pattern slanted at 45deg and -45deg. Combinations of two and more patches using quarter-wave impedance matching technique have been used to design the array antenna operate at 2.4 GHz. The design were simulated using...
The authors propose a new multiplexing and demultiplexing technique based on return-to-zero (RZ) duty cycle division, which is called absolute polar duty cycle division multiplexing (APDCDM). The new technique allows for more efficient use of time slots as well as spectrum. In this paper three users operating at the same speed of 2.5 Gb/s are multiplexed in electrical domain. The performance comparison...
The paper discussed on experimental result that improve the transmission distance by use of an integrated dispersion compensated double-pass erbium-doped fiber amplifier (DPC-EDFA). The chromatic dispersion compensation is achieved using chirped fiber Bragg grating as part of the EDFA design. The eye-pattern, eye-opening and timing jitter obtained using this technique shows an improvement equivalent...
We present a novel structure for silicon Raman lasers to improve efficiency of continues-wave (CW) lasing. Then, we show that our proposed structure not only provides higher optical Raman gain but also lowers threshold pump power.
A novel exponential structure has been presented for increasing net gain of optical amplification inside silicon-on-insulator (SOI) waveguides. The stimulated Raman scattering (SRS) has been simulated using FDTD method. The simulation results for the proposed structure have been compared with both analytical and experimental results of the previous works.
In this paper, we present a theoretical analysis of the noise resulting from cross-phase modulation in an optical WDM transmission system. Analytical approach has been used to evaluate the bit error rate (BER) performance limitation of a WDM transmission system imposed by crosstalk due to cross-phase modulation and the influence of changing channel spacing for various fiber types on the (BER) and...
For the purpose of integrating wavelength division multiplexer (WDM) into erbium doped waveguide amplifiers (EDWA), we present a 980/1550 nm planar lightwave circuit (PLC) WDM directional coupler. This silica based coupler is designed according to the fiber to waveguide coupling restriction and fabrication limitation. The coupler is designed and modeled in BeamPROP environment, utilizing finite difference...
In this paper, analysis of long wavelength and short wavelength VCSELs are presented. From the simulation results, power output and turn on delay (TOD) are investigated with the variation of Dext (distance between laser facet and fibre). In addition, different Rox (oxide aperture radius) were tested to investigate the effect of the Rox on the modulation transfer function. In the simulation, the comparison...
This document gives some definitions about PHY and MAC layer displaying its internal architecture and major functions to both layers. And as the same time states some information about cross-layer design, discussing the architecture of the cross-layer, and focusing on major methods of interfacing with giving one example of data transmission and interfacing which is meant to be very useful in this...
During the last few years, a new phenomenon had changed the internet business model especially for Internet service provider. The peer to peer (P2P) phenomenon is facilitating information flow from and back to end users. P2P systems are dynamic in nature where nodes can join and leave the network frequently. These nodes might not have a permanent IP addresses and dynamic changes over the inter connection...
This paper describes simulation study of bandwidth utilization of DiffServ traffic in the Internet using ns-2. The study investigates the behavior of traffic based on DiffServ traffic class types, i.e. Expedited forwarding (EF), assured forwarding (AF) and best effort (BE) traffic. The EF traffic is represented by real time constant bit rate premium traffic, AF by the real time variable bit rate assured...
A point-to-point wavelength division multiplexed (WDM) network is an optical network that uses electronic routers in its nodes for switching. On the other hand, in an automatically switched optical network (ASON), the switching is done in optical domain. Electronic switching is more expensive than optical switching. Pass-through traffic, which is traffic that goes through a node without originating...
There are many fields at where ad hoc networks are used, but applications like mission critical and commercial production or broadcasting which mostly contain real time audio and video streams and require absolute end to end guarantee for QoS. The key attribute these applications for guarantying for QoS is, they need routing path for connectivity like virtual leased line that is very difficult in...
Radio over fiber (RoF) technology or micro cellular over fiber is proposed solution for reducing cost and providing high reliable communication services. The system is a technique that modulates microwave signals on optical domain. In this hybrid technology, which synergies of the two communication domains, optical and radio, the technology is proposed for future generation of wireless radio communication...
In this paper, duty cycle division multiplexing (DCDM) is proposed as an alternative multiplexing technique. It can be applied in any communication systems, although the focus in this paper is in optical fiber communications. In this paper, we examine 3 channels each operating at 10 Gbps modulation rate over a single optical carrier. The performance comparison is made against 30 Gbps RZ transmitted...
This paper is to provide the preliminary result and activities of a research program at UNIMAP on rain attenuation in the Perlis region. The project uses the LaserBit product; model LB-2500 and LB-5000 which can maximum reach 2500 m and 5000 m with wavelength 785 nm and laser power 70 mW. The result will utilize four existing model rain attenuation and measured data will compared to calculated result...
Time integrated four wave mixing measurement of semiconductor microcavity polaritons was performed under a static electric field. Through comparison with results of a theoretical analysis based on modified optical Bloch equations, the experimental results were found to strongly suggest that the exciton-exciton interaction is significantly modified by the static electric field.
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