US 11,770,204 B1
System and methods for time and frequency division passive optical network
Junwen Zhang, Broomfield, CO (US); Zhensheng Jia, Superior, CO (US); Mu Xu, Broomfield, CO (US); Haipeng Zhang, Broomfield, CO (US); and Luis Alberto Campos, Superior, CO (US)
Assigned to Cable Television Laboratories, Inc., Louisville, CO (US)
Filed by CABLE TELEVISION LABORATORIES, INC., Louisville, CO (US)
Filed on Feb. 28, 2022, as Appl. No. 17/682,599.
Application 17/682,599 is a division of application No. 16/877,439, filed on May 18, 2020, granted, now 11,265,099.
Claims priority of provisional application 62/849,737, filed on May 17, 2019.
Int. Cl. H04J 14/00 (2006.01); H04J 14/02 (2006.01)
CPC H04J 14/0282 (2013.01) [H04J 14/025 (2013.01); H04J 14/0246 (2013.01); H04J 14/0247 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A passive optical network (PON), comprising:
a downstream transceiver including (i) a downstream processor configured to map a downstream data stream to a plurality of sub-bands of a frequency spectrum, and (ii) a downstream transmitter configured to transmit a downstream optical signal modulated with the plurality of sub-bands;
an optical transport medium in operable communication with the downstream transceiver, and configured for carrying the downstream and upstream optical signals;
a first upstream transceiver in operable communication with the optical transport medium, and including (i) a first local oscillator (LO) configured to tune a first LO center frequency to a first sub-band of the plurality of sub-bands, and (ii) a first downstream receiver configured for coherent detection of the downstream optical signal within the first sub-band; and
a second upstream transceiver in operable communication with the optical transport medium, and including (i) a second LO having a second LO center frequency, and (ii) a second downstream receiver configured for coherent detection of the downstream optical signal within a second sub-band of the plurality of sub-bands,
wherein the downstream processor is further configured to (i) dynamically allocate the first and second sub-bands to the first and second transceivers in both of the time and frequency domains, (ii) allocate the first sub-band to the first transceiver at a first time utilizing a first channel, (iii) allocate the second sub-band to the second transceiver at a second time utilizing a second channel, and (iv) allocate the first sub-band to the first transceiver at a third time utilizing a third channel different from the first channel, and
wherein the first time is different from the third time.