US 12,457,036 B2
Transmission direction determination apparatus, transmission direction determination method, recording medium, and transmission direction determination module
Yusuke Shimomura, Tokyo (JP); and Hitoshi Takeshita, Tokyo (JP)
Assigned to NEC CORPORATION, Tokyo (JP)
Filed by NEC Corporation, Tokyo (JP)
Filed on Jan. 29, 2024, as Appl. No. 18/425,020.
Claims priority of application No. 2023-019094 (JP), filed on Feb. 10, 2023.
Prior Publication US 2024/0275483 A1, Aug. 15, 2024
Int. Cl. H04B 10/079 (2013.01); G02B 6/42 (2006.01); G02B 6/43 (2006.01); H04B 10/25 (2013.01)
CPC H04B 10/0795 (2013.01) [G02B 6/4214 (2013.01); G02B 6/43 (2013.01); H04B 10/25 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A transmission direction determination apparatus comprising:
a first lens configured to collimate light propagating from one multi-core fiber of two multi-core fibers to the other multi-core fiber of the two multi-core fibers;
a second lens configured to focus the light that has propagated from the first lens;
a partially reflective mirror configured to reflect part of the collimated light and including a first surface and a second surface;
a first photodetector disposed on a side of the first surface of the partially reflective mirror and configured to measure an intensity of signal light reflected by the partially reflective mirror;
a second photodetector disposed on a side of the second surface of the partially reflective mirror and configured to measure an intensity of signal light reflected by the partially reflective mirror;
a memory configured to store instructions; and
a processor configured to execute the instructions to determine a transmission direction of light propagating through respective cores in the two multi-core fiber from the signal intensities measured by the first and second photodetectors.