Patent ID: 9692546
Date: 2017-06-27
CPC Classifications: H04J,H04Q

Claim:
1. A method of processing optical signals in a passive optical network, the method comprising: receiving first and fifth sub-band signals in a first optical spectrum; receiving second and sixth sub-band signals in a second optical spectrum different from the first optical spectrum; multiplexing the first and fifth sub-band signals into a first multiplexed sub-band signal in the first spectrum; multiplexing the second and sixth sub-band signals into a second multiplexed sub-band signal in the second spectrum; multiplexing the first and second multiplexed sub-band signals into a first combined multiplexed signal; outputting the first combined multiplexed signal; receiving a second combined multiplexed signal; demultiplexing the second combined multiplexed signal into third and fourth multiplexed sub-band signals; demultiplexing the third multiplexed sub-band signal into fourth and eighth sub-band signals in the first optical spectrum; demultiplexing the fourth multiplexed sub-band signal into third and seventh sub-band signals in the second optical spectrum; separating the first and fourth sub-band signals travelling in opposite directions in the first optical spectrum by routing the first signal and the fourth signal through a first optical circulator; separating the second and third sub-band signals travelling in opposite directions in the second optical spectrum by routing the second signal and the third signal through a second optical circulator; separating the fifth and eighth sub-band signals travelling in opposite directions in the first optical spectrum by routing the fifth signal and the eighth signal through a third optical circulator; separating the sixth and seventh sub-band signals travelling in opposite directions in the second optical spectrum by routing the sixth signal and the seventh signal through a fourth optical circulator; and outputting the third, fourth, seventh, and eighth sub-band signals.