عدل اجتماعی کے تصورات کا جائزہ و اہمیت قرآن و حدیث اور عالمی مذاہب کے تناطر میں

Human beings have been created in proportion and perfection by the Creator, as He is Just and Fair and likes justice and fairness in making and implementing laws. Justice is the key on every level from individual to State and interstate for peaceful and smooth functioning. Justice holds universal acceptance from the laws of nature to the creation of beings, while injustice leads to chaos. It causes the decline and disgrace among civilized societies. The chaos and terrorism in contemporary world is all because of injustices by individuals and by the States. The teachings of the messangers of Allah were to create the justice and equality at every level in the society. Deviation from the teachings of Allah and His messangers with respect to justice is a way towards destruction. Any nation that forgoes justice becomes victim of injustice itself and the consequences are ultimate anarchy and chaos. Islam as a universal religion demands the justice in every sphere of life. Islam and its teachings are for peace and prosperity. It promulgates and promotes human dignity and the value of Justice, equality and peace. Today the Ummah is in desperate need of adopting and practicing justice and fairness as the Creator has shown in His Word and Work.

Photonic Generation of Width Tunable Uwb Pulses

Ultra-wideband (UWB) is a cutting edge, short range and huge bit rate wireless communication technique which provides communication services at Gbps data rates per user. The developing attraction for UWB is primarily due to its various interesting characteristics, such as reduced power emission, resilience to fading, little probability of interception, conformance with other wireless technologies and potential of supporting cost-efficient Gbps transmission to user ends. Owing to low power spectral density (PSD), the transmission distance is restricted from few meters to tens of meters. UWB over fiber (UWBoF) is a recent technique used to extend the range of UWB wireless transmission and also integrates the UWB services with fixed wired or wireless communication networks. Generally, this dissertation proposes various simple, efficient and novel all-optical techniques of UWB signal generation and transmission over single mode fiber (SMF), multimode fiber (MMF) and free space optics (FSO) link in order to effectively utilize the imposed Federal Communication Commission (FCC) mask. The proposed schemes are cost efficient and promising the seamless delivery of high data rate signals to user ends. In addition to UWB signal generation, a novel all-optical 2R (re-shaping and re-amplification) regeneration and continuous wave (CW) to pulsed signal wavelength conversion scheme is also presented which can be used to extend the range of UWBoF access network apart from its core function of optical signal re-shaping and reamplification. In particular, all-optical regenerative technique of width tunable UWB signal generation operating at 5 Gbps has been proposed and simulated where UWB mono-cycle pulses are generated by employing the nonlinearity of highly nonlinear fiber (HNLF) and semiconductor optical amplifier (SOA) based nonlinear mediums. Width tuning of generated UWB mono-cycle pulses is achieved with all-optical means. The regeneraix tive property of the proposed technique is verified by comparing with optical delay line (ODL) based UWB signal generation scheme. A simple and cost efficient scheme of UWB signal generation in optical domain has been proposed where UWB mono-cycle pulses are generated by exercising the nonlinearity between two linearly polarized (LP) modes in a SOA. The proposed bi-directional architecture promises the delivery of 2 Gbps data over MMF for down-link (DL) and up-link (UL) transmissions. Cost efficiency is achieved by employing direct modulation and carrier re-use techniques. This dissertation also explores the possibility of all-optical generation and transmission of UWB signals over FSO link. Therefore, a cost efficient architecture for generation and transmission of multiple UWB signals using all-optical technique over FSO link has also been presented based on Gamma-Gamma (GG) channel model which is employed between central unit (CU) and remotely distributed multiple radio access units (RAUs). The cost efficiency with added advantage of data transmission at higher data rates have been achieved by reducing the deployment cost by using FSO link instead of optical fiber and generating multiple coherent optical carriers by direct modulation of a single CW laser for data transmission. Finally, a novel all-optical 2R regenerator and CW to pulsed signal wavelength converter operating at 10 Gbps has been proposed which performs re-shaping and reamplification functions as well as wavelength conversion by inducing nonlinear chirp over CW probe by data modulated optical pulsed signal in HNLF and offset filtering. After inclusion of this 2R regenerator, the range of UWBoF access network can be extended beyond 40 km.