We demonstrate a compact photon pair source based on a periodically poled lithium niobate nonlinear crystal in a short cavity. This approach provides efficient, low-loss, mode selection that is compatible with standard telecommunication networks. Photons with a coherence time of 8.6 ns (116 MHz) are produced and their purity is demonstrated. A source brightness of 134 pairs (s. mW. MHz)(-1) is ...

In the design of hearing aids (HA), real-time speech-enhancement is done. The digital should provide high signal-to-noise ratio, gain improvement and eliminate feedback. generic performance towards different frequencies varies non uniform. Existing noise cancellation speech separation methods drops voice magnitude under environment. HA for frequency response suppression reduce required signal s...

Currently, users identify wireless networks with firstand second-generation cellular telephony networks. Although voice and short messaging have driven the success of these networks so far, data and more sophisticated applications are emerging as the future driving forces for the extensive deployment of new wireless technologies. In this chapter, we will consider future wireless technologies th...

Worldwide interoperability for Microwave access(WIMAX) is a 802.16 wireless communication standard that provides high speed, throughput and cover larger area. Besides quality of service support, ieee 802.16 standard offer data rate upto 100mbps and cover area upto 50km.VOIP through wimax is most prominent service and is a growing rapidly in world of telecommunication. Recent studies focussing o...

We observe spectral hole burning in a room-temperature optical fiber pumped by a spectrally broadened pump beam. This beam drives the stimulated Brillouin process, creating an inhomogeneously broadened resonance in the material whose shape can be engineered by tailoring the beam's spectrum. A monochromatic saturating beam "burns" a narrow spectral hole that is approximately 10(4) times narrower...

We introduce a new model for describing the behavior of complex interconnection networks in the presence of faults. With our model, it is possible to obtain the detailed behavior of a faulty telecommunication network by specifying some parameters that describe its physical characteristics. We describe our model, we show how it can be applied to study some real network management structures, and...

A recent proposal for realizing long-distance, highfidelity qubit teleportation is reviewed. This quantum communication architecture relies on an ultrabright source of polarizationentangled photons plus a pair of trapped-atom quantum memories, and it is compatible with long-distance transmission over standard telecommunication fiber. Models are developed for assessing the effects of amplitude, ...

We present a rigorous approach for designing a highly efficient coupling between single mode optical fibers and silicon nanophotonic waveguides based on diffractive gratings. The structures are fabricated on standard SOI wafers in a cost-effective CMOS process flow. The measured coupling efficiency reaches -1.08 dB and a record value of -0.62 dB in the 1550 nm telecommunication window using a u...

A highly efficient grating structure for the coupling between standard optical fibers and single-mode waveguides in the silicon-on-insulator platform realized in a CMOS fabrication process is presented. The cost-effective method introduces a backside metal mirror to the grating coupler without need of an extensive wafer-to-wafer bonding. A coupling efficiency of -1.6 dB (around 69%) near the te...

International Mobile Telecommunications (IMT)Advanced is the new global standard defined by the International Telecommunication Union (ITU) for the fourth generation of mobile communication systems. Several technologies like Long Term Evolution (LTE)-Advanced have been proposed as IMT-Advanced candidates. In order to achieve this consideration, evaluations must ensure the achievement of a set o...