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Finally after searching i find good reference for defining it :
• Dual-drive configuration; modulating voltages are applied to both arms of the
interferometer using GSG electrode patterns. Phase changes of ±π/2 in the arms
of the interferometer.
• Single-drive configuration; modulating voltage is applied to one arm of the
interferometer. Phase change of π in the arm of the interferometer.
some other useful link is shared too:
it is good you know:
The MZ modulator are manufactured by using the different material, but presently most of the long distance high capacity optical communication systems utilize LiNbO for the same.