1,721,015 research outputs found
Performance Evaluation of Otpical Non-Return To Zero Transmission Systems: an Analytical Approach
No full textReduction of the Detrimental ASE Noise Effect in Optical Communication Systems by Means of Unusual Modulation Instability
No full textTheory of Noise Squeezing in Optically Amplified Systems Operating in Normal Dispersion Region and Applications to the Links Encompassing Semiconductor Optical Amplifiers
No full textLimits of Nonlinear Optical Transmission Systems Induced by the non-Ideal Behaviours of the Transmitter
No full textReduction of the Amplified Spontaneous Emission Noise Impact on Optical Communication Systems in the Normal Dispersion Region of the Fiber
No full textIt is analytically shown that in a propagation regime with a low average normal dispersion, the interplay between the Kerr effect and chromatic dispersion can reduce the degradation due to ASE noise in NRZ optical systems. Such behaviour is confirmed by simulations in links with a chromatic dispersion, having both a constant and a sawtooth distribution
Strategy for protection and restoration of optical paths in WDM backbone networks for next-generation Internet infrastructures
No full textThis paper proposes and analyzes a strategy for protection and restoration of optical paths in wavelength division multiplexing (WDM) networks for next-generation Internet infrastructure. Assuming a network model in which a multiprotocol label switching (MPLS) layer is overlaid on top of a WDM layer, and a segregation of the traffic on a wavelength basis, the strategy is based on a network dimensioning aiming at: 1) the support of different types of traffic, relating to different service categories; 2) the guarantee that all the wavelength paths carrying mission-critical services (with stringent quality of service requirements) are protected against failure; and 3) the possibility of restoring a large amount of wavelength paths carrying Internet best-effort services, i.e., low-priority (LP) preemptible traffic with no QoS requirements. The reference network scenario is an overlay model in which the optical network interacts with an MPLS network with a separated control plane; the optical network manages its resources to better serve the traffic coming from the MPLS network. Two path protection schemes, namely, disjoint path (DP) and single-link basis (SLB), and a link protection mechanism, namely, local repair (LP), are investigated. Furthermore, the paper considers both the case of using wavelength conversion in the optical nodes and the case in which wavelength conversion is not used at all. The analysis compares the performance of the different strategies in terms of the percentage of optical paths carrying LP traffic not served by the optical network after a failure and of the dimensions of the optical nodes for all the schemes. The analysis reveals that the proposed approach allows the restoration of a large amount of best-effort traffic with a reasonable increase of network redundancy
Wavelength Division Multiplexed Soliton Transmissions with Filtering
No full textWe present a theoretically study on the timing jitter induced by the interaction between solitons propagating in two wavelength separated channels of a long-haul fiber transmission system. We show that the inclusion of in-line filters almost suppresses the arrival time jitter even when the collision length is on the order of the amplifier spacing. Numerical results obtained by simulating a real N×5 Gb/s wavelength division multiplexed system confirm the theoretical predictions. The benefit deriving from the inclusion of in-line filters is maximum for transmission distances on the order of 4000 km, whereas on the transoceanic distance scale (9000 km) the improvement is limited by the incomplete suppression of the soliton frequency shift occurring during collisions
Tm Modes In A Slab Wave-guide Filled With Nematic Liquid-crystal In An External Magnetic-field
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