US 12,407,419 B2
Communication systems and methods
Zhensheng Jia, Superior, CO (US); Luis Alberto Campos, Superior, CO (US); and Curtis Dean Knittle, Superior, CO (US)
Assigned to Cable Television Laboratories, Inc., Louisville, CO (US)
Filed by CABLE TELEVISION LABORATORIES, INC, Louisville, CO (US)
Filed on Apr. 7, 2023, as Appl. No. 18/132,263.
Application 17/330,203 is a division of application No. 16/093,594, granted, now 11,025,344, issued on Jun. 1, 2021, previously published as PCT/US2017/023355, filed on Mar. 21, 2017.
Application 18/132,263 is a continuation of application No. 17/330,203, filed on May 25, 2021, granted, now 11,632,178.
Application 16/093,594 is a continuation in part of application No. 15/283,632, filed on Oct. 3, 2016, granted, now 9,912,409, issued on Mar. 6, 2018.
Claims priority of provisional application 62/321,211, filed on Apr. 12, 2016.
Prior Publication US 2023/0246716 A1, Aug. 3, 2023
Int. Cl. H04B 10/00 (2013.01); H04B 10/50 (2013.01); H04B 10/532 (2013.01); H04B 10/63 (2013.01); H04B 10/64 (2013.01); H04J 14/02 (2006.01); H04J 14/06 (2006.01)
CPC H04B 10/504 (2013.01) [H04B 10/502 (2013.01); H04B 10/505 (2013.01); H04B 10/506 (2013.01); H04B 10/532 (2013.01); H04B 10/63 (2013.01); H04B 10/64 (2013.01); H04J 14/0305 (2023.08); H04J 14/06 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A transceiver for an optical communication network, comprising:
a transceiver input configured to receive (i) a first coherent tone that is modulated with first data as a data-modulated first coherent tone, and (ii) a second coherent tone as an unmodulated second coherent tone, wherein the second coherent tone is phase synchronized with the first coherent tone;
a downstream receiver in communication with the transceiver input, and configured to (i) coherently detect the data-modulated first coherent tone, and (ii) utilize the unmodulated second coherent tone as a local oscillator source; and
an upstream transmitter configured to (i) modulate second data onto the second coherent tone as a data-modulated second coherent tone, and (ii) transmit upstream the data-modulated second coherent tone along with an unmodulated first coherent tone,
wherein a frequency difference between the first and second coherent tones is held constant throughout the optical communication network.