Document
1887 mots
8 pages
Optical Telecommunication Networks1 – Overview of optical networks
2 – Optical fibers and cables : characteristics and manufacturing technologies
3 – Optoelectronic components
4 – WDM : Wavelength Division Multiplexed systems
5 – Design, standards and future evolutions
Jean-Jacques BERNARD
OPTEL Formation
Phone. : +33 6 88 48 89 70
Email : bernardjj@free.fr
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1
Part 1
Overview of optical networks
History of optical fiber development
•Development of fibers and devices for optical communications began in the early 1960s and continues strongly today
• The four major developments and inventions that have contributed to this progress :
JJB – June 2013
2
Needs for higher bit rates
• Increasing needs for higher bit rates
JJB – June 2013
3
Internet applications: bit rate classes
• 3 classes of bit rates are commonly considered for the Internet applications
- Low bit rates : < 1 Mbit/s
- Medium bit rates : 1 to 10 Mbit/s
- High bit rates : 10 to > 100 Mbit/s
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Internet applications: bit rate classes
• Low bit rate applications
Internet access
File downloading
With a bit rate < 1 Mbit/s :
- Downloading only compressed photos and videos (medium quality)
- No real-time video (streaming) possible
JJB – June 2013
5
Internet applications: bit rate classes
• Medium bit rate applications
Internet access
File downloading
Interactive television
With a bit rate of 10 Mbit/s :
- Possibility to receive real-time television while downloading files
- It is the inferior limit of the « High Bit Rate »
- Corresponds to the Numerical Convergence (Triple-Play)
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Internet applications: bit rate classes
• High bit rate applications
Internet
access
Digital television 100 Mbit/s simultaneous Triple Play actions
File downloading JJB – June 2013
In-line games 7
Internet applications: bit rate classes
• Future