7 research outputs found
Performance of translucent optical networks under dynamic traffic and uncertain physical-layer information
This paper investigates the performance of translucent
Optical Transport Networks (OTNs) under different traffic
and knowledge conditions, varying from perfect knowledge to
drifts and uncertainties in the physical-layer parameters. Our
focus is on the regular operation of a translucent OTN, i.e., after
the dimensioning and regenerator placement phase. Our contributions
can be summarized as follows. Based on the computation
of the Personick’s Q factor, we introduce a new methodology for
the assessment of the optical signal quality along a path, and
show its application on a realistic example. We analyze the performance
of both deterministic and predictive RWA techniques
integrating this signal quality factor Q in the lightpath computation
process. Our results confirm the effectiveness of predictive
techniques to deal with the typical drifts and uncertainties in the
physical-layer parameters, in contrast to the superior efficacy of
deterministic approaches in case of perfect knowledge. Conversely
to most previous works, where all wavelengths are assumed
to have the same characteristics, we examine the case
when the network is not perfectly compensated, so the Maximum
Transmission Distance (MTD) of the different wavelength channels
may vary. We show that blocking might increase dramatically
when the MTD of the different wavelength channels is overlooked.Postprint (published version
Optical Transmission System with optical Chromatic Dispersion Compensator
Sistema di trasmissione ottica operante in presenza di un compensatore ottico della dispersione cromatic
Performance of translucent optical networks under dynamic traffic and uncertain physical-layer information
This paper investigates the performance of translucent
Optical Transport Networks (OTNs) under different traffic
and knowledge conditions, varying from perfect knowledge to
drifts and uncertainties in the physical-layer parameters. Our
focus is on the regular operation of a translucent OTN, i.e., after
the dimensioning and regenerator placement phase. Our contributions
can be summarized as follows. Based on the computation
of the Personick’s Q factor, we introduce a new methodology for
the assessment of the optical signal quality along a path, and
show its application on a realistic example. We analyze the performance
of both deterministic and predictive RWA techniques
integrating this signal quality factor Q in the lightpath computation
process. Our results confirm the effectiveness of predictive
techniques to deal with the typical drifts and uncertainties in the
physical-layer parameters, in contrast to the superior efficacy of
deterministic approaches in case of perfect knowledge. Conversely
to most previous works, where all wavelengths are assumed
to have the same characteristics, we examine the case
when the network is not perfectly compensated, so the Maximum
Transmission Distance (MTD) of the different wavelength channels
may vary. We show that blocking might increase dramatically
when the MTD of the different wavelength channels is overlooked