US 11,888,522 B2
Optical transmission system and optical transmission method
Koki Shibahara, Musashino (JP); Takayuki Mizuno, Musashino (JP); and Yutaka Miyamoto, Musashino (JP)
Assigned to NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
Appl. No. 17/800,201
Filed by NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
PCT Filed Feb. 19, 2020, PCT No. PCT/JP2020/006489
§ 371(c)(1), (2) Date Aug. 16, 2022,
PCT Pub. No. WO2021/166112, PCT Pub. Date Aug. 26, 2021.
Prior Publication US 2023/0057448 A1, Feb. 23, 2023
Int. Cl. H04B 10/2581 (2013.01); H04B 10/2507 (2013.01); H04B 10/61 (2013.01)
CPC H04B 10/2581 (2013.01) [H04B 10/2507 (2013.01); H04B 10/614 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An optical transmission system comprising:
N transmitters configured to convert N electrical signals indicating N data sequences different from one another into N optical signals, respectively, N being an integer of 1 or more;
a signal generator configured to convert the N optical signals into first M optical signals by splitting the N optical signals via N optical splitters, M being an integer of 2 or more, M being larger than N;
a multiplexer configured to convert the first M optical signals into one mode-multiplexed signal that is excitable in at least M modes;
a demultiplexer configured to receive the one mode-multiplexed signal via a mode-multiplexed fiber and convert the one mode-multiplexed signal into second M optical signals;
M receivers configured to convert the second M optical signals into M electrical signals, respectively; and
a signal detector configured to extract the N data sequences by performing signal separation on the M electrical signals.