12-04-2012, 04:42 PM
Photonics and Optical Communication
1 Introduction Optical Communication.pdf (Size: 512.67 KB / Downloads: 59)
Introduction to Communication Need for Fiber Optical Communication
Increase of the bit ratedistance
product BL for
different communication
technologies
over time.
Ref.: G.P. Agrawal, Fiber-
Optic Communication
systems
Need for Fiber Optical Communication
Increase of the bandwidth and
decreases of the cost per
transmitted bit for optical
communication systems during
the 1990‘s.
Ref.: S. Kartalopoulos, WDWM
Netorsk, Devices and
Technology
Evolution of Lightwave systems
1. Generation: The development of low-loss fibers and semiconductor lasers
(GaAs) in the 1970‘s.
A Gallium Aresenide (GaAs) laser operates at a wavelength of 0.8μm. The
optical communication systems allowed a bit rate of 45Mbit/s and repeater
spacing of 10km.
2. Generation: The transition from 0.8μm to 1.3μm leads to the 2.
Generation of lightwave systems. The bite rate- distance product can be
further increased by using single mode fibers instead of multi-mode fibers.
Single mode fibers have a distinctly lower dispersion than single mode
fibers.
State of the Art optical communication system: Dense Wavelength Division
Multiplex (DWDM) in combination of optical amplifiers. The capacity of
optical communication systems doubles every 6 months. Bit rates of
10Tbit/s were realized by 2001.
Ref.: S. Kartalopoulos, WDWM Networks, Devices and Technology