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Providing ultra high-speed end-to-end connectivity in core optical networks while satisfying the requirements for quality of service is a topic of intense research. In an optical network, a connection is set up to carry a data signal via an all-optical channel (lightpath) from its source to destination nodes. The analog nature of the signal transmission through the network links and nodes leads to...
Transmission quality is being a very important issue in optical communication systems. As an optical signal propagates along a lightpath connecting a source node to a destination node in the network, the quality of transmission is degraded due to transmission impairments introduced by long-haul optical components. Consequently, the signal's bit error rate (BER) at the destination node can become unacceptably...
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...
We investigate and demonstrate for the first time the benefit of IM-DPSK signals over NRZ signal in wavelength conversion using Four Wave Mixing in Semiconductor Optical Amplifier. Using this method, we experimentally demonstrate the wavelength conversion at 10 Gb/s with distance of 450 Km (5 span of 90 Km) using Non Zero Dispersion Shifted Fiber (NZDSF) Single Mode Fiber (SMF). The result shows the...
In WDM all-optical networks where electrical regeneration is not available, physical impairments due to propagation in the fibers, amplifier noise, and leaks between channels and in the switches cannot be removed at the physical layer. These effects cause calls, especially between physically distant nodes, to be rejected because they cannot meet minimum Quality of Transmission (QoT) requirements,...
The bit error rate (BER) performance comparison of a wavelength division multiplexing (WDM) ring network in presence of four wave mixing (FWM) using repeated unequal spaced (RUS) and equal spaced (ES) scheme is reported taking into consideration of photo detector shot noise, beat noise components arising out of the beating of the signal with accumulated amplifierpsilas spontaneous emission (ASE) and...
In this paper we present the linearization of Impulse Radar Ultra Wideband (IR-UWB) transmission system over fiber. The radio frequency signal of IR-UWB is transmitted over 50 km of the single mode fiber (SMF) using external Mach Zehnder Modulator (MZM), amplified, linearized and detected by PIN diode photo receiver. For improving the linearity and suppressing the four wave mixing (FWM) caused by...
We present a comprehensive theoretical study of four-wave mixing in optical fiber with exploring four fiber types. The four-wave mixing induced crosstalk noise is described by an expression that is based on NLS equation, and it describes the mutual channel interference optical losses in multi channel optical communications system. The corresponding system of equations has then been numerically integrated,...
Performance analysis is carried out to evaluate the bit error rate (BER) performance limitation of a WDM transmission system imposed by crosstalk due to stimulated Raman scattering. Power penalty evaluated at a BER of 10-9 shows a significant impact of Raman induced crosstalk on the number of wavelengths that can be transmitted. Penalty is higher at higher input power, higher number of channels and...
We designed and built a novel all-optical re-timing, re-amplifying, and re-shaping (3R) regeneration system based on terahertz optical asymmetric demultiplexers (TOADs) developed in our laboratory. The system is capable of parallel processing multiple wavelengths, a feature which will significantly improve the scalability of current wavelength division multiplexing (WDM) networks. Performance against...
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