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IEC TR 61282-5
Edition 2.0 2019-07
TECHNICAL
REPORT
Fibre optic communication system design guidelines –
Part 5: Accommodation and compensation of chromatic dispersion
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IEC TR 61282-5
Edition 2.0 2019-07
TECHNICAL
REPORT
Fibre optic communication system design guidelines –
Part 5: Accommodation and compensation of chromatic dispersion
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.01 ISBN 978-2-8322-7131-5
– 2 – IEC TR 61282-5:2019 © IEC 2019
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and abbreviated terms . 6
3.1 Terms and definitions . 6
3.2 Abbreviated terms . 6
4 Background . 7
5 Impact of chromatic dispersion . 8
5.1 Dependence on fibre type . 8
5.2 Dispersion-unshifted fibres . 8
5.3 Dispersion-shifted fibres . 10
5.4 Pulse broadening . 11
5.5 Pulse narrowing and signal peaking . 13
5.6 Dispersion-limited transmission distance . 14
6 Compensation and accommodation of dispersion . 16
6.1 Passive dispersion compensation along the optical path . 16
6.1.1 General . 16
6.1.2 Dispersion compensating fibre . 16
6.1.3 Chirped fibre Bragg grating . 17
6.1.4 Etalon filter . 18
6.2 Dispersion management . 18
6.3 Accommodation of dispersion . 20
6.4 Pre-distortion of the transmitted signal . 20
6.5 Electrical accommodation in the receiver . 21
6.6 Dispersion-assisted transmission . 22
6.7 Mid-span spectral inversion . 23
7 Passive dispersion compensator parameters . 24
7.1 Compensated fibre length . 24
7.2 Operating wavelength range . 24
7.3 Chromatic dispersion . 24
7.4 Dispersion slope . 25
7.5 Insertion loss . 25
7.6 Wavelength-dependent loss . 25
7.7 Phase ripple . 26
7.8 Reflectance . 26
7.9 Polarization-mode dispersion . 26
7.10 Polarization-dependent loss . 27
7.11 Optical nonlinearity . 27
7.12 Latency . 27
8 Passive dispersion compensator applications . 28
8.1 Unamplified fibre spans . 28
8.2 Fibre links with in-line optical amplifiers . 28
8.3 Multi-channel WDM transmission systems . 29
8.4 Hybrid transmission systems . 30
8.5 Multi-band WDM transmission systems . 30
9 System parameters for passive dispersion compensators . 30
Bibliography . 32
Figure 1 – Range of the dispersion coefficient for B-652.D fibres . 9
Figure 2 – Distortions in a 10 Gbit/s NRZ signal at various amounts of CD . 14
Figure 3 – Summing the dispersions of a B-652 fibre and a DCF over the C-band . 17
Figure 4 – Reflectivity and time delay of an FBG-based PDC . 18
Figure 5 – Periodic dispersion map with span-by-span compensation . 19
Figure 6 – Transmitter for generating pre-compensated optical signals . 21
Figure 7 – Coherent optical receiver with electrical CD post-compensation . 22
Figure 8 – Spectral inversion of a modulated signal via four-wave mixing . 23
Figure 9 – Passive dispersion compensators placed at the receiver . 28
Figure 10– PDCs placed before optical booster amplifiers at the transmitter . 28
Figure 11 – PDCs placed after pre-amplifiers at the receiver. 28
Figure 12 – Optically amplified link with in-line PDCs . 29
Figure 13 – Optically amplified WDM communication link with in-line PDCs . 29
Figure 14 – WDM link with individual compensation of residual dispersion . 30
Figure 15 – Two-band WDM link with OA and PDC in the C-band . 30
Table 1 – Single-mode fibre types and range of dispersion coefficients at 1 550 nm . 11
Table 2 – Dispersion-limited transmission distances over B-652 fibre at 1 550 nm . 15
Table 3 – Primary system parameters for DCF-based PDCs . 31
Table 4 – Primary system parameters for FBG-based PDCs . 31
– 4 – IEC TR 61282-5:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC COMMUNICATION SYSTEM DESIGN GUIDELINES –
Part 5: Accommodation and compensation of chromatic dispersion
FOREWORD
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