US 12,438,619 B2
Frequency division multiple access optical subcarriers
Jeffrey T. Rahn, Sunnyvale, CA (US); Kuang-Tsan Wu, Kanata, CA (US); Steven J. Hand, Los Gatos, CA (US); and David F. Welch, Atherton, CA (US)
Assigned to Infinera Corporation, San Jose, CA (US)
Filed by Infinera Corporation, San Jose, CA (US)
Filed on Dec. 25, 2021, as Appl. No. 17/561,941.
Application 17/561,941 is a division of application No. 16/578,397, filed on Sep. 22, 2019, abandoned.
Claims priority of provisional application 62/813,151, filed on Mar. 4, 2019.
Prior Publication US 2022/0263581 A1, Aug. 18, 2022
Int. Cl. H04B 10/60 (2013.01); H04B 10/50 (2013.01); H04B 10/54 (2013.01); H04B 10/61 (2013.01); H04J 14/02 (2006.01)
CPC H04B 10/503 (2013.01) [H04B 10/54 (2013.01); H04B 10/60 (2013.01); H04B 10/61 (2013.01); H04B 10/616 (2013.01); H04J 14/0298 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A receiver provided in a communication system including a transmitter, the transmitter receiving data and supplying a plurality of optical subcarriers carrying information indicative of the data, the receiver, comprising:
a local oscillator laser operable to supply light;
optical hybrid circuits operable to mix the light and the plurality of optical subcarriers to provide mixing products;
photodiodes operable to convert the mixing products to electrical signals;
analog to digital conversion circuitry operable to provide digital signals based on the electrical signals; and
a processor operable to receive the digital signals, the processor including:
fast Fourier transform circuitry operable to provide frequency domain data based on the digital signals, and
a plurality of memories operable to store the frequency domain data,
wherein the receiver is operable to selectively output part of the data from the plurality of optical subcarriers based on values of the stored frequency domain data.