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