ghjk

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)

4. Types of semiconductor laser:-

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.

9. Thank you