Probabilistically shaped unamplified optical signaling
AssigneeJuniper Networks, Inc.
InventorsZhen Qu, Xiao Han, Yang Yue
Life of this patent
Estimating the term…
Abstract
An optical transmitter can generate probabilistically shaped quadrature amplitude modulation (PS-QAM) signaling for transmission over a fiber to a destination without optical amplification. The single fiber can transmit the PS-QAM signaling using dense wavelength division multiplexing having a relatively large number of channels that are closely spaced. A coherent receiver can receive the PS-QAM signaling for decoding without implementing chromatic dispersion compensation.
Claims20
An intra-datacenter of optical switch network comprising:
- a plurality of probabilistically shaped quadrature amplitude modulation (PS-QAM) transmitters that each generate probabilistically shaped QAM symbols using a probability distribution to generate a PS-QAM signal;
- a multiplexer that combines the PS-QAM signals from the plurality of PS-QAM transmitters to generate a dense wavelength division multiplexed (DWDM) signal for transmission over fiber within the intra-datacenter optical switch network;
- a demultiplexer that receives the DWDM signal;
- and
- one or more fiber links less than 2 km in length that transmit the DWDM signal from the multiplexer to the demultiplexer without optical amplification,
- wherein:
- the DWDM signal spans 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 channels of the DWDM signal.
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;
- combining, using a multiplexer, the plurality of PS-QAM signals into a dense wavelength division multiplexed (DWDM) optical signal;
- 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;
- and
- receiving the DWDM optical signal at the second node;
- wherein;
- the DWDM signal spans 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 channels of the DWDM signal.
Dependencies are inferred from the claim text.