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We demonstrate DAC-less generation and transmission of 256-quadrature amplitude modulation signals at a symbol rate of 32 GBd using an indium phosphide segmented Mach–Zehnder modulator with 15 active sections and dedicated BiCMOS driver arrays. The linear quantization characteristic of the segmented modulator with 4-bit resolution allows the generation of spectrally efficient modulation formats without...
We demonstrate for the first time 32 GBd 64-QAM signal generation without the usage of DACs. The dual-polarization 64-QAM signal is transmitted error-free over 80 km of SSMF with 7.8 pJ/bit record low energy consumption.
To satisfy the increasing capacity demand in today's networks, in particular exceeding 100 Tbit/s per fiber, pose a severe challenge. This paper names technology options to meet this challenge and describes in particular an example of a 4D modulation format in more detail.
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