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A method for producing a quality of transmission estimator for optical transmissions

A technology of transmission quality and optical transmission, which is applied in the field of optical communication systems and can solve problems such as optical signal degradation

Inactive Publication Date: 2017-05-24
ALCATEL LUCENT SAS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In fact, due to physical effects, optical signals are degraded when propagating in optical media

Method used

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  • A method for producing a quality of transmission estimator for optical transmissions
  • A method for producing a quality of transmission estimator for optical transmissions
  • A method for producing a quality of transmission estimator for optical transmissions

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Embodiment Construction

[0094] In an illustrative example, a WDM optical network carries 100 Gb / s per wavelength on uncompensated optical links, ie without in-line dispersion compensation between fiber spans included in the optical links. The network must carry the demand of multiple 100Gb / s, and the payload of 100Gb / s is transmitted through polarization multiplexing quadrature phase shift keying PDM-QPSK wavelength.

[0095] It is well known that for such systems the main sources of impairment are amplified spontaneous emission (ASE) noise and distortion due to the Kerr effect. Both effects can be modeled very accurately by additive white Gaussian noise. The overall signal-to-noise ratio at the receiver is defined by:

[0096]

[0097] And the nonlinear distortion-to-signal ratio is defined by:

[0098] where P is the power of the signal, P ASE is the power of amplified spontaneous emission (ASE) noise measured in a reference bandwidth (e.g. 0.1 nm for the traditional definition of optical S...

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Abstract

The disclosure is about a method for producing a quality of transmission estimator for optical transmissions, comprising: -defining a local dispersion value, -defining a dispersion increment (14), -performing a propagation calculation along an elementary section being a propagation medium characterized by the local dispersion value, an elementary section length corresponding to the dispersion increment (14) and wherein the optical signal which is incoming in the elementary section is previously affected by a cumulative dispersion value (D1 to D6) equal to the integer number of the dispersion increment, -for each elementary section, determining a variance of noise, the noise representing a distortion due to Kerr nonlinear field contributions in the elementary section, -for each couple of elementary sections, determining a covariance of noise between the couple of elementary sections, -storing in a data repository a look-up table comprising the variances and covariances. The disclosure also provides a quality of transmission estimator device.

Description

technical field [0001] The present invention relates to the technical field of optical communication systems, in particular to a method and a system for generating a transmission quality estimator (estimator) for optical transmission. Background technique [0002] In optical networks, optical signals become weak and distorted over considerable distances. In fact, due to physical effects, optical signals are degraded while propagating in optical media. Physical degradation depends on many factors, such as the distance of propagation, the characteristics of the optical link, frequency occupancy and so on. [0003] Numerical methods such as the Split-Step Fourier Method (SSFM) can perform propagation calculations. In "Semi-Analytical Model for the Performance Estimation of 100Gb / s PDMTransmission Systems without Inline Dispersion Compensation and Mixed FiberTypes" by E.Seve et al., Proc.ECOC, Th.1.D.2, London (2013), it is described that A semi-analytical model that allows t...

Claims

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Application Information

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IPC IPC(8): H04B10/079H04B10/2525
CPCH04B10/2525G02B6/4246G02B6/425G02B6/00G02B6/29376H04B10/07951H04B10/07953H04B10/2537H04B10/2543H04B10/2563H04B10/2581
Inventor E·塞弗P·拉曼塔尼斯J-C·安东纳S·比戈
Owner ALCATEL LUCENT SAS
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