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SEMICONDUCTOR
LASER FOR OPTICAL
COMMUNICATION
PRESENTED BY:-
Abhishek
75113002
B.TECH (ECE)
8TH SEMESTER
4TH YEAR
CONTENTS:-
 Introduction
 Type
 Advantages
 Disadvantages
 Applications
Semiconductor laser:-
• The semiconductor lasers
were initially developed in
1962 by Robert Hall.
• Semiconductor lasers are
popular optical
communication light
sources for high speed data
transmission.
• They consist of complex
multi-layer structures.
Semiconductor lasers (635nm, 520nm, 445nm)
Types of semiconductor laser:-
Advantages:-
 Smaller size
 Semiconductor laser are economical in cost.
 Its construction is simple.
 It has high efficiency.
 low power consumption.
Disadvantages:-
• Due to relatively low power production, these lasers are not
suited to many typical laser applications.
• Semiconductor laser is greatly dependent on temperature.
• Beam divergence is much greater from 125 to 400 milli
radians as compared to all other lasers.
• The cooling system requirement.
Applications:-
• The semiconductor laser can be pulsed at varying rate and
pulse widths.
• This laser is a natural transmitter of digital data.
• Semiconductor laser is well suited for interface with fiber optic
cables used in communication.
• various kinds of medical treatments.
Modulation and Stabilization
 A particular advantage of the short upper-state lifetime is the
capability of semiconductor lasers to be modulated with very
high frequencies, which can be tens of gigahertz for VCSELs.
 This is exploited mainly in optical data transmission, but also
in spectroscopy, for the stabilization of lasers to reference
cavities, etc.
Thank you

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Oc ppt

  • 1. SEMICONDUCTOR LASER FOR OPTICAL COMMUNICATION PRESENTED BY:- Abhishek 75113002 B.TECH (ECE) 8TH SEMESTER 4TH YEAR
  • 2. CONTENTS:-  Introduction  Type  Advantages  Disadvantages  Applications
  • 3. Semiconductor laser:- • The semiconductor lasers were initially developed in 1962 by Robert Hall. • Semiconductor lasers are popular optical communication light sources for high speed data transmission. • They consist of complex multi-layer structures. Semiconductor lasers (635nm, 520nm, 445nm)
  • 5. Advantages:-  Smaller size  Semiconductor laser are economical in cost.  Its construction is simple.  It has high efficiency.  low power consumption.
  • 6. Disadvantages:- • Due to relatively low power production, these lasers are not suited to many typical laser applications. • Semiconductor laser is greatly dependent on temperature. • Beam divergence is much greater from 125 to 400 milli radians as compared to all other lasers. • The cooling system requirement.
  • 7. Applications:- • The semiconductor laser can be pulsed at varying rate and pulse widths. • This laser is a natural transmitter of digital data. • Semiconductor laser is well suited for interface with fiber optic cables used in communication. • various kinds of medical treatments.
  • 8. Modulation and Stabilization  A particular advantage of the short upper-state lifetime is the capability of semiconductor lasers to be modulated with very high frequencies, which can be tens of gigahertz for VCSELs.  This is exploited mainly in optical data transmission, but also in spectroscopy, for the stabilization of lasers to reference cavities, etc.