Design of laser based free space communication system

Dissertant

Rashid, Muhammad Siham

University

University of Technology

Faculty

-

Department

Applied Sciences Department

University Country

Iraq

Degree

Master

Degree Date

2004

English Abstract

This Project introduces the use of laser as a signal carrier in free space to connect and transfer the data between two computers by Point-To-Point Technologies (Full-Duplex Transmission) for long distances.

Each computer contains on the RS-232 Serial Port.

Transmitter unit include laser device in addition to the electronic circuits and driver circuit to operation it.

On the other hand, the receiver unit (RX) contains photodiode (PIN) as an optical detector, amplifier and RS-232 serial.

This serial port transforms the optical signal which comes from the transmitter to the electrical signals.

Each computer contains serial transceiver card, which consist of transmitter and receiver electronic circuits operation at (115 Kpbs).

The use of a free space optical transmission link has extended the distance between the connected computers in to point-to-point network.

The proposed system stand on the OSI model with three layers (1, 2, and 7).

Furthermore, remote control application software has been written by using C++ Language and CRC method to detect the error in the transmission in high quality.

A high quality Data communication link for a distance reached about to 500 m was achieved with signal to noise ratio equal to (30.1 dB), the system calculation shows that the bit error rate (BER) is (10"8 ) and the system power budget is (51.4) db.

Main Subjects

Physics

Topics

• Optical communications

• APA
• MLA
• AMA

Language

English

Data Type

Arab Theses

Record ID

BIM-305770