Modulation and Quadrature Phase Shift
Aim : To design an optical data communication network which uses Offset Quadrature Phase Shift Keying modulation technique.
oftSware used : Optisystem
Components used:
1) Psuedo Random Bit Sequence Generator
2) RZ Pulse Generator
3) Fork 1x2
4) Oscilloscope Visualiser
5) RF Spectrum Analyser
6) OQPSK Modulator
7) Quadrature De-modulator
8) M-ary Threshold Detector
9) Eye Diagram Analyzer
10) PSK Sequence Decoder
Components Description and their Specifications:
PRBS Generator :
In this project, the data is in the form of digital data i.e 0’s & 1’s. Hence in order to generate a digital sequence we do need a data generating source, hence we use a digital data source generating a random binary sequence known as pseudo random binary sequence generator. The bit sequence is designed to approximate the characteristics of random data.
Bit rate = 30375000 bits/sec
Order = 8
RZ Pulse Generator : Generates a Return to Zero (RZ) coded signal. It uses RZ line coding technique to generate electrical signal using binary pulses as it’s input.
Duty cycle is 0.5 bits. Rise time and Fall time both are equal to 0.05 bits.
Sample rate = 1.94 GHz
Fork 1x2 : Here in this project , the bit sequence is to be given to RZ pulse generator and OQPSK modulator. Fork 1x2 copies the input signal into two output signals. This tool allows us to duplicate component output ports.
Oscilloscope Visualizer: This visualizer allows us to calculate and display electrical signals in the time domain. It can display the signal amplitude and autocorrelation.
RF Spectrum Analyser : This visualizer allows us to calculate and display electrical signals in the frequency domain. It can display the signal intensity, power spectral density and phase. Power is measured in dBm and Resolution Bandwidth is 10 MHz.
OQPSK Modulator : Encodes and
oftSware used : Optisystem
Components used:
1) Psuedo Random Bit Sequence Generator
2) RZ Pulse Generator
3) Fork 1x2
4) Oscilloscope Visualiser
5) RF Spectrum Analyser
6) OQPSK Modulator
7) Quadrature De-modulator
8) M-ary Threshold Detector
9) Eye Diagram Analyzer
10) PSK Sequence Decoder
Components Description and their Specifications:
PRBS Generator :
In this project, the data is in the form of digital data i.e 0’s & 1’s. Hence in order to generate a digital sequence we do need a data generating source, hence we use a digital data source generating a random binary sequence known as pseudo random binary sequence generator. The bit sequence is designed to approximate the characteristics of random data.
Bit rate = 30375000 bits/sec
Order = 8
RZ Pulse Generator : Generates a Return to Zero (RZ) coded signal. It uses RZ line coding technique to generate electrical signal using binary pulses as it’s input.
Duty cycle is 0.5 bits. Rise time and Fall time both are equal to 0.05 bits.
Sample rate = 1.94 GHz
Fork 1x2 : Here in this project , the bit sequence is to be given to RZ pulse generator and OQPSK modulator. Fork 1x2 copies the input signal into two output signals. This tool allows us to duplicate component output ports.
Oscilloscope Visualizer: This visualizer allows us to calculate and display electrical signals in the time domain. It can display the signal amplitude and autocorrelation.
RF Spectrum Analyser : This visualizer allows us to calculate and display electrical signals in the frequency domain. It can display the signal intensity, power spectral density and phase. Power is measured in dBm and Resolution Bandwidth is 10 MHz.
OQPSK Modulator : Encodes and