What is PD IEC TR 61282‑5 - Fibre optic communication system design guidelines about?
PD IEC TR 61282 is a series on fibre optic communication system design guidelines. Fibre-optic communication is a method of transmitting information from one place to another by sending pulses of infrared light through an optical fibre. PD IEC TR 61282‑5 is a Technical Report, that describes various techniques for accommodation and compensation of chromatic dispersion in fibre optic communication systems. These techniques include dispersion compensation with passive optical components, advanced dispersion management, and electronic accommodation of dispersion in the transmitters and receivers.
Who is PD IEC TR 61282‑5 - Fibre optic communication system design guidelines for?
PD IEC TR 61282‑5 on fibre optic communication system design guidelines is useful for:
- Telecommunication equipment manufacturers
- Telecommunication component manufacturers
- Fibre optic installers
- Design engineers
- Quality control personnel
Why should you use PD IEC TR 61282‑5 - Fibre optic communication system design guidelines?
To overcome distance limitations, special fibres have been developed that exhibit relatively small or even negligible dispersion in the wavelength range of interest. It was found, however, that fibres with vanishing dispersion are not well suited for long-haul communication systems employing dense wavelength-division multiplexing (DWDM) because of signal distortions due to nonlinear optical interactions between the various multiplexed signals, such as cross-phase modulation (XPM) and four-wave mixing (FWM). In fibres with relatively large CD, the nonlinear signal distortions accumulate much more slowly than in fibres with only small or even vanishing CD. The reason is that dispersion introduces differential time delays between the various multiplexed signals as they travel through the fibre, which has the effect that they de-phase the nonlinear interactions between the signals. For this reason, PD IEC TR 61282‑5 introduces DWDM communication systems that usually employ fibres that have non-vanishing dispersion in the wavelength range of interest.
PD IEC TR 61282‑5 defines techniques for reducing the waveform distortions caused by accumulated CD including the insertion of passive optical elements with opposite dispersion along with the fibre link (optical dispersion compensation), the dispersion-assisted transmission of optical signals (soliton pulses), and electrical accommodation of Cd-induced waveform distortions in the optical transmitters and receivers (pre-and post-compensation). Optical compensation techniques are primarily applied in medium- to long-haul DWDM transmission systems using direct-detection (i.e., noncoherent) receivers, whereas electrical accommodation techniques are widely employed in transmission systems using coherent receivers and complex vector modulation. Depending on the fibre type, short-reach communication systems, in particular those operating in the 1 300-nm wavelength range, may not require dispersion mitigation, because of their short length (typically less than 10 km) and small dispersion coefficient. Using PD IEC TR 61282‑5 you can describe various techniques for accommodation and compensation of chromatic dispersion in fibre optic communication systems.
What’s changed since the last update?
PD IEC TR 61282‑5:2019 supersedes PD IEC TR 61282‑5:2002. PD IEC TR 61282‑5:2019 includes some technical changes with respect to PD IEC TR 61282‑5:2002. These include:
- Extends the application space for dispersion compensation and accommodation to communication systems that employ non-zero dispersion-shifted fibres
- Adds a discussion on the suitability of fibre types for long-haul transmission of wavelength-multiplexed signals
- Updates the dispersion coefficient limits for dispersion-unshifted fibres
- Adds information on the dispersion coefficients of dispersion-shifted fibres
- Updates the naming of the fibre types to the revised naming conventions defined in IEC 60793-2-50:2018