Patent ID: 11937029
Assignee: JUNIPER NETWORKS, INC.
Field: Telecommunications (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 11:
12. A method for optically transmitting data within an intra-datacenter optical switch network, the method comprising:
generating, using a plurality of probabilistically shaped quadrature amplitude modulation (PS-QAM) transmitters in a first node of the intra-datacenter optical switch network, QAM symbols that are shaped using a probability distribution to generate a plurality of PS-QAM signals, the PS-QAM signal having a modulation order of at least 64-QAM;
combining, using a multiplexer, the plurality of PS-QAM signals into a dense wavelength division multiplexed (DWDM) optical signal comprising at least 80 DWDM channels at different wavelengths, each of the channels comprising one of the PS-QAM signals, the at least 80 DWDM channels in the DWDM signal having spacings of 75 GHz or less;
transmitting, using one or more fiber links less than 2 km in length, the DWDM optical signal from the first node to a second node in the intra-datacenter optical switch network without optical amplification;
separating, using a demultiplexer in the second node, the DWDM optical signal into separate PS-QAM signals; and
receiving and processing one of the separate PS-QAM signals with a PS-QAM coherent receiver,
wherein:
the at least 80 channels and the spacings of the channels result in the DWDM signal spanning a wavelength band greater than a passband of an Erbium-Doped Fiber Amplifier; and
each PS-QAM transmitter shapes the QAM symbols to reduce cross-talk between the channels of the DWDM signal at the spacings of the channels of the DWDM signal.