We propose a bidirectional wavelength division multiplexing passive optical network (WDM-PON) based on a reflective semiconductor optical amplifier (RSOA) by employing a differential quadrature phase shift keying (DQPSK) signal for down-link and an on-off keying (OOK) re-modulated signal for up-link over 45km SMF colorless WDM-PON without dispersion compensation was demonstrated for both 10 Gbi...

With the rise in demand for channel capacity, Wavelength Division Multiplexing (WDM) technique is employed in optical communication networks. Gain Flattened Erbium Doped Fiber Amplifier (EDFA) is used in optical WDM system to obtain a uniform output power level. The performance of EDFA depends on various parameters such as fiber length, pump power, pumping wavelength and pumping technique. The ...

The dynamic traffic-grooming problem in wavelength routed networks is generally a two-layered routing problem in which traffic connections are routed over light paths in the virtual topology layer and light paths are routed over physical links in the physical topology layer. Traffic grooming for multicast communication in WDM networks has received very little attention to date. In this paper, w...

Pacing toward converged voice and data networks, the IP over WDM/OTN network architecture supported by MPLS satisfies the advanced next-generation network requirements to provide fast, reliable, and flexible connectivity services. Acknowledging.the advantages of networks that utilize the above technologies, operators evolve their networks in that direction, while continuously working to provide...

In this contribution we develop a theoretical statistical approach to predict the acceptable bandwidth tolerances for optical filter cascades in wavelength division multiplexing (WDM) networks. We also establish tolerances for the center frequency misalignments considering a statistical approach presented in a previous work. The optical filters analyzed have a trapezoidal shape, and different b...

In this paper, we will discuss the network architectures and the enabling technologies to realize a robust multi-wavelength optical access network. Various network topologies employing the dense WDM or coarse WDM technique; as well as several network enabling technologies such as data re-modulation technique, fiber link protection and traffic restoration, etc. will be described. Besides, some f...

Extending WDM transmission distances between regenerators and increasing the channel bit-rates are required to achieve cost-effective terabit/s backbone networks. However, the achievable performance is limited the fibre nonlinearity, with high optical launch powers and short pulse widths leading to nonlinear distortion of the signals. In this paper, we report new results of splitstep Fourier si...

This paper discusses survivable routing for Wavelength Division Multiplexing (WDM) networks. The downside of boosting network capacity through a technology like WDM is increasing network vulnerability. With more than one network operator in South Africa network survivability will be one of the most important and challenging quality of service (QoS) criteria. This paper investigates new network ...

Wavelength-division-multiplexing (WDM) networks with wide channel grids and bandwidths are promising for low-cost, low-power optical interconnects. Wide-bandwidth, single-band (i.e., no free-spectral range) add-drop filters have been developed on silicon using anti-reflection contra-directional couplers with out-of-phase Bragg gratings. Using such filter components, we demonstrate a 4-channel, ...

Erbium-doped fiber amplifiers ~EDFAs! have been intensively studied for wavelength-division-multiplexing ~WDM! communication systems. The stabilization of the amplifier gain against the input signal-power variation is one of the key issues for WDM networks. The gainstabilizing technique using a passive optical feedback device, such as a bandpass filter or a fiber Bragg grating, has been reporte...