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BSI PD IEC/TR 61282-12:2016

BSI PD IEC/TR 61282-12:2016

$167.15

Fibre optic communication system design guides – In-band optical signal-to-noise ratio (OSNR)

Published By Publication Date Number of Pages
BSI 2016 38
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The purpose of this part of IEC 61282, which is a Technical Report, is to provide a definition for in-band optical signal-to-noise ratio (OSNR) that is applicable to situations where the spectral noise power density is not independent of the optical frequency, as assumed in the OSNR definition of IEC 61280-2-9, but is significantly shaped across the optical bandwidth of the signal. Considering the development of multiple measurement methods for different use cases, as detailed below, it is desirable to establish a definition of in-band OSNR that is independent of the method used and, furthermore, is consistent with the OSNR definition of IEC 61280-2-9 in the case of frequency-independent noise power density.

PDF Catalog

PDF Pages PDF Title
4 CONTENTS
6 FOREWORD
8 1 Scope
2 Normative references
3 Terms and definitions
10 4 Background
4.1 General
11 4.2 Higher spectral density of signals
Figures
Figure 1 – Optical power spectrum composed of a modulated signal and ASE noise
12 4.3 Spectral filtering in wavelength-routing elements
Figure 2 – Optical power spectrum of 50-GHz spaced 40 Gbit/s RZ-DQPSK signals with significant spectral overlap
13 4.4 Transmission of signals with multiple subcarriers
Figure 3 – Optical power spectrum of 50-GHz spaced 10 Gbit/s NRZ-OOK signals after spectral filtering in ROADMs
Figure 4 – Optical power spectrum of a 400 Gbit/s optical “superchannel” comprised of four very densely spaced 100 Gbit/s PM-QPSK signals
14 5 In-band OSNR measurement with spectrally shaped noise
5.1 Measurement of in-band ASE noise
15 5.2 In-band OSNR definitions
5.2.1 Background
5.2.2 Spectrally integrated in-band OSNR
16 5.2.3 In-band OSNR from averaged noise power spectral density
5.2.4 In-band OSNR from maximal noise power spectral density
17 5.2.5 In-band OSNR for individual optical subcarriers
5.3 Spectral shaping of ASE noise
5.3.1 General
5.3.2 Case (a): ASE noise shaped outside of the signal spectrum
18 5.3.3 Case (b): ASE noise shaped within the signal spectrum
Figure 5 – Power spectral density of a 10 Gbit/s signal with ASE noise that has been shaped by a relatively broad optical filter
19 5.3.4 Case (c): ASE noise shaping in a ROADM network
Figure 6 – Power spectral densities of a broadband 40 Gbit/s signal and ASE noise which have been shaped by the same filter
Figure 7 – Variation of the in-band OSNR values Rint, Ravg and Rmax versus filter bandwidth for the signal shown in Figure 6
20 Figure 8 – Optical power density spectra of signal and ASE noise after filtering in a ROADM network with intermediate amplification
21 6 Guidelines for using the definitions
6.1 General
Figure 9 – Variation of the in-band OSNR values Rint, Ravg and Rmax versus number of filters for the signal shown in Figure 8
22 6.2 Wavelength integration range
23 Figure 10 – Impact of integration range on Rint for 43 Gbit/s RZ-DPSK signals in a ROADM network
Figure 11 – Impact of instrument noise on s(ν)/ρ(ν) for strongly filtered 10 Gbit/s NRZ-OOK signals
24 6.3 Spectral resolution
25 Figure 12 – Dependence of in-band OSNR on spectral resolution for 43 Gbit/s RZ-DQPSK signals
26 Figure 13 – Dependence of in-band OSNR on spectral resolution for 10 Gbit/s NRZ-OOK signals
27 7 In-band OSNR penalties of filtered signals
7.1 Scope of simulations
28 7.2 Results for 43 Gbit/s RZ-DQPSK
Figure 14 – ROADM filter arrangements for OSNR penalty simulations
30 Figure 15 – In-band OSNR penalties for filtered 43 Gbit/s RZ-DQPSK signals
31 Figure 16 – In-band OSNR penalties for filtered 128 Gbit/s PM NRZ-QPSK signals
32 Figure 17 – In-band OSNR penalties for filtered 10 Gbit/s NRZ-OOK signals
33 7.3 Results for 128 Gbit/s PM NRZ-QPSK
7.4 Results for 10 Gbit/s NRZ-OOK
7.5 Observations
35 Bibliography

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BSI PD IEC/TR 61282-12:2016
$167.15