US 10,892,829 B2
Systems and methods for full duplex coherent optics
Zhensheng Jia, Superior, CO (US); Luis Alberto Campos, Superior, CO (US); and Jing Wang, Broomfield, CO (US)
Assigned to Cable Television Laboratories, Inc, Louisville, CO (US)
Filed by CABLE TELEVISION LABORATORIES, INC, Louisville, CO (US)
Filed on Nov. 21, 2018, as Appl. No. 16/198,396.
Claims priority of provisional application 62/589,121, filed on Nov. 21, 2017.
Claims priority of provisional application 62/636,249, filed on Feb. 28, 2018.
Prior Publication US 2019/0158182 A1, May 23, 2019
Int. Cl. H04B 10/40 (2013.01); H04B 10/25 (2013.01); H04B 10/27 (2013.01); H04J 14/02 (2006.01); H04B 10/61 (2013.01)
CPC H04B 10/40 (2013.01) [H04B 10/25 (2013.01); H04B 10/2589 (2020.05); H04B 10/27 (2013.01); H04B 10/61 (2013.01); H04J 14/02 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A full duplex communications network, comprising:
an optical hub including a first coherent optics transceiver;
a fiber node including a second coherent optics transceiver;
an optical transport medium operably coupling the first coherent optics transceiver to the second coherent optics transceiver; and
a first optical circulator disposed at the optical hub and a second optical circulator disposed at the fiber node,
wherein the first coherent optics transceiver is configured to (i) transmit a first optical signal at a first wavelength and a first power level, and (ii) receive a second optical signal at the first wavelength,
wherein the second coherent optics transceiver is configured to (i) receive the first optical signal from the first coherent optics transceiver at the first wavelength, and (ii) transmit the second optical signal at the first wavelength and a second power level,
wherein the first and second optical circulators are configured to separate the first optical signal from the second optical signal at respective opposing ends of the optical transport medium,
wherein the first coherent optics transceiver is further configured to control the first power level such that the first power level is maintained within 5 decibel-milliwatts (dBm) of the second power level, and
wherein the full duplex paradigm is configured for bidirectionality between the first and second coherent optics transceivers such that the first and second optical signals are significantly agnostic of an upstream direction versus a downstream direction.