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Multi-format 800 – 1600 Gb/s coherent transceiver for inter-data centre interconnects over SMF

An eight-channel multi-format coherent optical transceiver is proposed as an alternative to implement terabit metro inter-data centre interconnects (DCI) transmitting from 800 to 1600 Gb/s over conventional single mode fibre (CSMF). The maximum reach of the system as a function of transmitted power and overall capacity is numerically estimated for a BER target of 1×10−13, avoiding the use of optical amplification and FEC schemes. A maximum reach of 114, 81 and 40 km is found for data rates of 800, 1200 and 1600 Gb/s when QPSK, 8PSK and 16-QAM are set as modulation formats, respectively, and the optical power at the lasers output is set to 13 dBm. No relevant transmission power penalties are found for the analysed systems because they are fully compensated by electronic digital signal processing at the receiver. This is not the case for other noise sources generated at the transceivers. Additionally, moderate OSNR penalties due to fibre attenuation, that increase as the modulation format order increases and as the BER target decreases, are calculated.