US 12,170,544 B2
Optical signal processing circuit, optical reception apparatus, and optical signal processing method
Masaki Sato, Tokyo (JP); Hidemi Noguchi, Tokyo (JP); and Junichi Abe, Tokyo (JP)
Assigned to NEC CORPORATION, Tokyo (JP)
Appl. No. 17/766,314
Filed by NEC Corporation, Tokyo (JP)
PCT Filed Oct. 5, 2020, PCT No. PCT/JP2020/037766
§ 371(c)(1), (2) Date Apr. 4, 2022,
PCT Pub. No. WO2021/070790, PCT Pub. Date Apr. 15, 2021.
Claims priority of application No. 2019-186763 (JP), filed on Oct. 10, 2019.
Prior Publication US 2024/0056197 A1, Feb. 15, 2024
Int. Cl. H04B 10/61 (2013.01); H04B 3/06 (2006.01)
CPC H04B 10/616 (2013.01) [H04B 3/06 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An optical signal processing circuit comprising:
a frequency-domain MIMO equalizer configured to generate, based on continuous subcarrier signals including a target subcarrier signal in an optical multicarrier signal to be received, the continuous subcarrier signals that have been subjected to frequency-domain MIMO equalization processing; and
a time-domain MIMO equalizer configured to generate, based on the continuous subcarrier signals that have been subjected to the frequency-domain MIMO equalization processing, the target subcarrier signal that has been subjected to time-domain MIMO equalization processing, wherein
the continuous subcarrier signals include N subcarrier signals that are successively multiplexed to respective frequencies above and below the target subcarrier signal, where N is a natural number,
an input×output of the frequency-domain MIMO equalizer is (2N+1)×(2N+1), and an input output of the time-domain MIMO equalizer is (2N+1)×1.