Transcript Long Haul Fiber Optic Transmission Systems : Modeling and

Design of Lightwave
Communication Systems and
Networks
Objectives
• To introduce the basic physics of photonic devices
and apply it for the design of optical transmission
systems and networks.
• To simulate the various photonic components and
also to do system level simulations.
• To study different noise processes in photonic
circuits and understand their impact on Q-factor or
BER.
• To develop engineering rules for the design of
fiber-optic transmission systems.
Expectations
• My expectation:
– Speak up.
– Course as interactive as possible.
• Your expectations ?
Course Outline
• Review of electromagnetic theory - 1 lecture.
• Fiber modes and pulse propagation in fibers – 3 lectures.
– Sec. 1 LP modes
– Sec. 2 Fiber dispersion and fiber propagation
• Generation, amplification and detection of light - 4
lectures
– Sec. 3 Semiconductor lasers and LED
– Sec. 4 Amplifiers (SOA and EDFA )
– Sec. 5 Photo-detectors
Course Outline
 Point-to-point, single wavelength transmission system (2 lectures)
 Sec. 6 Functional Block (Transmitter and Receiver) Design
 Sec. 7 Penalties due to fiber dispersion and amplifier noise
 Sec. 8 System design with Tx, fiber, concatenated amplifiers and Rx

 Eye Diagrams and Q-factor estimation
Wavelength division multiplexed system (1 lecture)
 Sec. 9 Add/drop multiplexers
 Sec. 10 cross-talk in WDM system
 Linear cross-talk
 Nonlinear cross-talk due to four wave mixing
 Optical Networks (1 lecture)
Sec. 11 - SONET/SDH, circuit, packet and cell networks
Assessment
• Final exam – 50%
• Project
- 50%
– Each student will be assigned a project.
– The project involves
• A good research survey.
• Simulation of a photonic device or a circuit.
• Project report.
History
•
Invention of Laser and Maser in 1960s
- In 1950s, Townes and Schawlow in the US and Basov and Prochorov in
the USSR proposed to make use of stimulated emission for the
construction of coherent optical sources.
– In 1960- Maiman demonstrated the first laser.
– In 1970, Hayashi et al demonstrated GaAs semiconductor laser operating
at room temperature.
•
Low Loss Fibers in 1970s
– Fibers available in 1960s had losses in excess of 1000dB/km.
– In 1970, Kapran, Keck and Maurer invented a low loss fiber with the loss
of 20 dB/km.
– In 1979, Miya et al reported a loss of 0.2 dB/km near 1550 nm.
•
Erbium Doped Fiber Amplifiers in 1980s.
– In 1980s, Poole et al in the UK and Desurvire in the US demonstrated
light amplification by EDFA. Now it is used in all commercial long haul
fiber optic networks.
Point-to-Point Optical Transmission
System
Lasers Modulators
1
2
MUX
N
Fiber
Amp
DEMUX
Rx
Contact Info
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Instructor: Dr. S. Kumar
E-mail: [email protected]
Office hours: Wednesday 2-4 PM
Office: CRL #219
Web page of the course:
www.ece.mcmaster.ca/faculty/~kumars/Lightwave_course.
htm