As the charge gradient is established in the device, it needs the right bandgap for the carriers to tunnel through. For this, the channel is made of Si and a low bandgap material, SiGe has been used ...
Fig 1. A DP-QPSK transmitter and a coherent receiver with ADC and DSP are key analog components for long-distance transmission systems. Fig 2. Shown is the measured (blue, green) and simulated (red) ...
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