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Optiwave software can be used in different industries and applications, including Fiber Optic Communication, Sensing, Pharma/Bio, Military & Satcom, Test & Measurement, Fundamental Research, Solar Panels, Components / Devices, etc..
Download our 30-day Free Evaluations, lab assignments, and other freeware here.
Hi All,
What is the different between the Differential Group Delay and the signal time delay. there is parameter in the optical fiber called Differential group delay (ps/km). if I set the length of the fiber to 100km and the differential group delay to 0.2. is that mean the optical signal will be delay or advance by 20ps.
Hi Mohammad,
The word “differential” in differential group delay refers to the difference in propagation time between the x polarization axis and y polarization axis. So in 100 km, you’ll have 20ps time difference between x-pol. and y-pol. signals.
Signal time delay means that the determined delay is applied to the whole signal.
Regards
Hi Alistu,
Thanks for your reply, do you know how can I calculate the time delay for the signal.
I tried to check the optical signal before and after the optical fiber using optical time vir. and I found the time different between them is half of the differential group delay.
Hi Mohamed,
The time delay of the signal is dependent on the dispersion parameter, and the dispersion parameter is wavelength dependent, which causes a pulse broadening (as for different wavelengths, the delay is different). I don’t know if it can be calculated using some formula, but maybe it can be done using dispersion of elements with least delay (I have never tried it though).
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