Sensor networks are widely used in the large geographical area and this has to be finding the location of every transmission. The frequencies are considered the major persuasion in sensor networks. Frequency division multiple access (FDMA), time division multiple access (TDMA) and Code division multiple access techniques (CDMA) are used to share the available bandwidth, but these approaches are...

This paper addresses the design of packet transmission schedules in photonic slotted wavelength-division multiplexing/time-division multiplexing broadcast-and-select networks with wavelengths and nodes. Nodes are equipped with one tunable-wavelength transmitter with nonnegligible tuning times and one fixed-wavelength receiver. A new scheduling algorithm that exploits multihop packet transfer to...

Erbium doped fiber amplifier (EDFA) has greatly helped in overcoming the propagation loses which are of biggest concern for next generation wavelength division multiplexing (WDM)/time division multiplexing (TDM) passive optical network (PON). This study is To characterize the performance of high-concentration EDFAs and the effect of the concentration quenching (homogeneous up-conversion and clu...

In this paper I intend to present the concept of superframes and its use, primarily, in multiplexing techniques. The signals are supposed band limited and three multiplexing schemes are considered: Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA) and Frequency Hoping Multiple Access (FHMA). The rst two schemes give rise to tight superframes, whereas for FHMA, the ...

In this paper, the performance and feasibility of a hybrid wavelength division multiplexing/time division multiplexing passive optical network (WDM/TDM PON) system with 128 optical network units (ONUs) is analysed. In this system, triple play services (video, voice and data) are successfully communicated through a distance of up to 28 km. Moreover, we analysed and compared the performance of va...

In this paper, we propose a Computer Aided Design (CAD) tool so called HiperionCAD, which allows the design and optimization of Time-Division Multiplexing (TDM) and Wavelength-Division Multiplexing (WDM) optical networks. The tool has been developed by means of the Model-Driven Development (MDD) approach. The HiperionCAD software allows the network visual design and the following computations: ...

In this paper we proposed the physical layer security scheme in WDM-PON. Simulated result of eavesdropping attempt in WDM-PON is presented. This physical security enhancement is accomplished through inclusion of Broadband Light Source in OLT to create a TDM signal in which each data frame is transmitted at unique wavelength. Simulation tools verify that implementation of enhance security techni...

Orthogonal frequency division multiplexing (OFDM) combined with time division multiplexing (TDM), called OFDM/TDM, can overcome the high peak-to-average-power ratio (PAPR) problem of the conventional OFDM. Its bit error rate (BER) performance in a frequency-selective fading channel is improved by adoption of frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion...

Significant effort in optical-fiber research has been put in recent years into realizing mode-division multiplexing (MDM) in conjunction with wavelength-division multiplexing (WDM) to enable further scaling of the communication bandwidth per fiber. In contrast almost all integrated photonics operate exclusively in the single-mode regime. MDM is rarely considered for integrated photonics due to ...

Abstract— In this paper, we propose the use of verticalBell Labs layered space-time (V-BLAST) detection for orthogonal frequency division multiplexing code division multiplexing (OFDM-CDM) systems. Considering the properties of the VBLAST detection as well as the frequency diversity from CDM, we propose a new CDM transform matrix to improve the performance of V-BLAST detection of OFDM-CDM signa...