In this paper, we enhance the performance efficiency of free-space optical (FSO) communication link using hybrid on-off keying (OOK) modulation, M-ary digital pulse position modulation (M-ary DPPM), and M-pulse amplitude (M-PAPM). This work analyzes enhances bit error rate (BER) moment generating function, modified Chernoff bound, Gaussian approximation techniques. existence both an amplified s...

The IEEE Ethernet Passive Optical Networks (EPON) standard is a leading Time Division Multiplex (TDM) standard for PONs. The paper investigates the operation of an EPON based system in a Dense Wavelength Division Multiplex (DWDM) environment. It extends the concept of a multi-wavelength system from being merely a stack of independent PONs to that of a stack of a switched set of PONs. The functi...

A radio-on-dense-wavelength-division-multiplexing (DWDM) transport system based on injection-locked Fabry-Perot laser diodes (FP LDs) with four microwave carriers and large effective area fiber (LEAF) transmission was proposed and demonstrated. Good performance of bit error rate (BER) and intermodulation distortion to carrier ratio (IMD/C) over a-50 km of LEAF was obtained. Signal quality meets...

The next generation 10-Gigabit Ethernet Standard is currently under development and is expected to come out in the next few years. This paper highlights ongoing discussions regarding several aspects of 10-Gigabit Ethernet such as market requirements, implementation structures, layer interfaces, coding techniques, frame formats, media, devices, and etc. See Also: Gigabit Ethernet | Gigabit Ether...

The optimization of multiplexing (MUX) and demultiplexing (DMUX) 3-dB filter bandwidths for the optical differential quadrature phase shift key (DQPSK) combined with the return-to-zero (RZ) and carrier-suppressed returnto-zero (CS-RZ) is performed. The study of different optical signals in the 40 Gb/s dense wavelength division multiplexing (DWDM) system, with high spectral efficiency, is shown ...

DWDM (Dense Wavelength Division Multiplexing) is a highly promising solution to provide high bandwidth networks. In order to make more efficient use of large bandwidth, two types of DWDM transmission protocols have been designed: reservation-based protocols and pre-allocation protocols. A reservation-based protocol uses at least one control channel to reserve access to the remaining data channe...

In Dense Wavelength Division Multiplexing (DWDM) technologies, the optimal packet scheduling is a common encounter issue in multiple channels network. NP-hard problem deals with finding a way to rearrange packets in multiple channels into a finite and rare channel. Genetic algorithm (GA) is one of the most efficient ways to solve this issue. We hope to find a better solution to our task through...

Dec 2000 News: * Claiming a world-best speed record for optical data transmission, researchers at Siemens have transmitted 7 Tbits/s over a single optical fiber using DWDM. That's the equivalent of over 100 million telephone calls or a billion pages of typed data per second. The demonstration was conducted by Siemens' Information and Communication Networks Group at the company's Advanced Optica...

The IP+GMPLS over DWDM model has been considered a trend for the evolution of optical networks. However, a challenge that has been investigated in this model is how to achieve fast rerouting in case of DWDM failure. Artificial Neural Networks (ANNs) can be used to generate proactive intelligent agents, which are able to detect failure trends in optical network links early and to approximate opt...