US 11,982,884 B2
Optical signal processing device
Mitsumasa Nakajima, Musashino (JP); and Toshikazu Hashimoto, Musashino (JP)
Assigned to NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
Appl. No. 16/967,205
Filed by Nippon Telegraph and Telephone Corporation, Tokyo (JP)
PCT Filed Feb. 26, 2019, PCT No. PCT/JP2019/007345
§ 371(c)(1), (2) Date Aug. 4, 2020,
PCT Pub. No. WO2019/167953, PCT Pub. Date Sep. 6, 2019.
Claims priority of application No. 2018-037580 (JP), filed on Mar. 2, 2018.
Prior Publication US 2020/0363660 A1, Nov. 19, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. G02F 1/01 (2006.01); G02F 1/05 (2006.01); H04J 14/02 (2006.01)
CPC G02F 1/0102 (2013.01) [G02F 1/0126 (2013.01); G02F 1/0508 (2013.01); H04J 14/02 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An optical signal processing device comprising:
a light source generating an optical signal;
first optical modulation means for modulating at least one of intensity and phase of the optical signal at a first modulation period to generate an input signal;
second optical modulation means for modulating at least one of intensity and phase of the input signal at a second modulation period;
an optical circulation unit in which the modulated input signal circulates at a predetermined delay length;
optical multiplex means for joining the modulated input signal in the optical circulation unit;
a nonlinear response element giving nonlinearity to the optical signal circulating in the optical circulation unit;
variable optical modulation means for modulating the optical signal circulating in the optical circulation unit;
first optical branch means for branching part of the optical signal circulating in the optical circulation unit;
optical reception means for demodulating branched light output from the first optical branch means to obtain an intermediate signal; and
a signal processing circuit for weighting the intermediate signal with any coupling weight and taking a sum to obtain an output signal, wherein
the signal processing circuit changes the coupling weight so as to reduce an error between the output signal and a teacher signal.