How can you calculate Q factor in order to verify the simulated Q factor result

[Jerrin Mohan]

Hi

How do I calculate the Max Q factor on paper for a given system in order to verify if my simulated Max Q factor shown on my eye diagram in optisystem is correct and corresponds with my calculated Q?

Here are the parameters for the given system:
32 x 5Gb/s DWDM system
Fiber span includes a 100km (NZDSF), 2.7km (DCF), EDFA (Gain = 21 dB & Noise Figure = 6dB), 6 connectors in total (0.75 dB insertion loss each)
dispersion of NZDSF: 4 ps/nm.km
dispersion of DCF: -147 ps/nm.km
LOOP CONTROL = 1
Transmission Type:DML
TX Power:5dBm
Central Wavelength: 1550nm
Modulation Type:NRZ
Loss of Multiplexer:5dB
Loss of Demultiplexer: 5dB
Frequency Spacing:100GHz
Receiver Sensitivity: -18 dBm
Thermal noise: 1e-022
Insertion Loss of PIN: 3dB
Cut off Frequency = 0.75 X bit rate = 0.75 x 5 Gb/s = 3.75 GHz

[Mohamed A. A. Abouseif]

Hi Mohan,
to calculate Q factor from the measured Eye diagram is simple.
Attached file show you how to calculate it.

hope this helps,
thanks
Mohamed Abouseif

[Jerrin Mohan]

Thank you sir, but how do I calculate Q factor from the given parameters without a eye diagram? I mean the equation you have provided calculates the q factor from the opening of a measured eye diagram, but I would like to find out an equation that calculates Q factor strictly with the parameters i have given above and without an eye diagram. This will then help me compare if my calculated result of the q factor is equal to the result i get from the q factor calculated from the opening of the eye diagram.

[Author]

Posts