Fujitsu demonstrates ultra high-speed short-reach data transmission based on multi-level signalling, advanced ADC/DAC
Fujitsu Semiconductor Europe has demonstrated the transmission of >100Gbps over a single CEI-28G-VSR channel, effectively quadrupling the data rate throughput defined by the Optical Internetworking Forum (OIF) for this chip-to-chip electrical interface. This serves as a benchmark for what can be achieved over short-reach electrical channels using the same field-proven CMOS converter technology deployed in long-haul optical transport systems today. Key to the study is a comparison of the relative advantages and disadvantages of PAM (Pulse-amplitude Modulation) encoding versus DMT (Discrete Multi-Tone) over this particular channel. FSEU's test and demonstration platform is based on the test chips and evaluation boards for the family of 40nm, 65GSps CMOS converters ("LEIA" DAC for transmit and "LUKE" ADC for receive).