US 12,335,668 B2
Probabilistically shaped unamplified optical signaling
Zhen Qu, Sunnyvale, CA (US); Xiao Han, Tucson, AZ (US); and Yang Yue, Milpitas, CA (US)
Assigned to Juniper Networks, Inc., Sunnyvale, CA (US)
Filed by Juniper Networks, Inc., Sunnyvale, CA (US)
Filed on Feb. 14, 2024, as Appl. No. 18/441,481.
Application 18/441,481 is a continuation of application No. 17/392,782, filed on Aug. 3, 2021, granted, now 11,937,029.
Prior Publication US 2024/0223922 A1, Jul. 4, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H04Q 11/00 (2006.01); G06N 7/01 (2023.01); H04B 10/54 (2013.01); H04J 14/02 (2006.01)
CPC H04Q 11/0005 (2013.01) [G06N 7/01 (2023.01); H04B 10/54 (2013.01); H04J 14/0305 (2023.08); H04Q 2011/0037 (2013.01)] 20 Claims
OG exemplary drawing
 
1. 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.