US 12,235,158 B2
Optical signal detection system, optical signal detection device, and optical signal detection method
Tsuyoshi Konishi, Osaka (JP); Ryohei Kamikawa, Osaka (JP); and Yu Yamasaki, Osaka (JP)
Assigned to OSAKA UNIVERSITY, Osaka (JP)
Appl. No. 18/008,257
Filed by OSAKA UNIVERSITY, Osaka (JP)
PCT Filed Jun. 22, 2021, PCT No. PCT/JP2021/023553
§ 371(c)(1), (2) Date Dec. 5, 2022,
PCT Pub. No. WO2021/261476, PCT Pub. Date Dec. 30, 2021.
Claims priority of application No. 2020-108229 (JP), filed on Jun. 23, 2020.
Prior Publication US 2023/0213384 A1, Jul. 6, 2023
Int. Cl. G01J 3/12 (2006.01); G01J 11/00 (2006.01); H04B 10/67 (2013.01)
CPC G01J 3/12 (2013.01) [G01J 11/00 (2013.01); H04B 10/67 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An optical signal detection system comprising:
a nonlinear converter that nonlinearly converts a plurality of first optical signals into a plurality of second optical signals, and also a third optical signal into a fourth optical signal, the plurality of first optical signals being predetermined and different from each other in at least one of temporal waveform, intensity, amplitude, or phase;
a spectrometer that obtains each of a plurality of first spectral data items from a different one of the plurality of second optical signals, and also a third spectral data item from the fourth optical signal; and
a detection device that detects the third optical signal and outputs a detection result, wherein
the detection device includes:
an analyzer that performs sparse principal component analysis on the plurality of first spectral data items to generate a plurality of second spectral data items, each of the plurality of second spectral data items having less frequency components than a corresponding one of the plurality of first spectral data items; and
a detector that compares the third spectral data item with each of the plurality of second spectral data items, and detects the third optical signal based on a result of the comparison.