US 12,407,416 B2
Optical access network
Shingo Ono, Musashino (JP); and Chihiro Kito, Musashino (JP)
Assigned to NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
Appl. No. 18/269,885
Filed by NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
PCT Filed Jan. 27, 2021, PCT No. PCT/JP2021/002780
§ 371(c)(1), (2) Date Jun. 27, 2023,
PCT Pub. No. WO2022/162773, PCT Pub. Date Apr. 8, 2022.
Prior Publication US 2024/0063911 A1, Feb. 22, 2024
Int. Cl. H04B 10/275 (2013.01); H04Q 11/00 (2006.01); H04B 10/03 (2013.01); H04B 10/032 (2013.01); H04B 10/27 (2013.01); H04J 14/02 (2006.01)
CPC H04B 10/2755 (2013.01) [H04Q 11/0005 (2013.01); H04B 10/03 (2013.01); H04B 10/032 (2013.01); H04B 10/27 (2013.01); H04B 10/271 (2013.01); H04B 10/275 (2013.01); H04J 14/0201 (2013.01); H04J 14/0212 (2013.01); H04J 14/022 (2013.01); H04J 14/0283 (2013.01); H04J 14/0287 (2013.01); H04Q 2011/0041 (2013.01)] 5 Claims
OG exemplary drawing
 
1. An optical access network comprising:
an upper loop optical fiber cable which includes a plurality of fixed station lines and at least one common line and is laid on a loop-like path passing through a communication carrier base facility; and
a lower loop optical fiber cable of a plurality of lower loop optical fiber cables which includes at least one user line and at least one redundant line and is laid on a loop-like path passing through a connection point with the upper loop optical fiber cable and a user base facility,
wherein
a fixed connection line for connecting the user line and the fixed station lines in a 1:1 ratio, and an optical fiber switching function unit for exclusively connecting the redundant line and the common line are provided at the connection point,
the number of the common lines is smaller than the total number of the redundant lines included in each of the plurality of lower loop optical fiber cables, and
the optical fiber switching function unit switches connection between the redundant line and the common line according to demand fluctuation of the lower loop optical fiber cable.