Abstract
The distinct period doubling behaviour in a 10 GHz gain-switched (GS)DFB laser is experimentally investigated in frequency domain and intime domain. The period doubling occurs as the frequency of the rfdriving signal is close to or higher than the -3 dB cutoff frequency ofthe DFB laser diode, and the amplitude of the rf driving signalrequired to achieve period doubling increases linearly with theincreasing bias current of the laser diode.
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