US 11,916,659 B2
Station-side device, optical communication system, and search method
Mitsuya Morimoto, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
Filed on Sep. 16, 2022, as Appl. No. 17/946,061.
Claims priority of application No. 2021-191278 (JP), filed on Nov. 25, 2021.
Prior Publication US 2023/0163873 A1, May 25, 2023
Int. Cl. H04J 14/08 (2006.01)
CPC H04J 14/08 (2013.01) 11 Claims
OG exemplary drawing
 
1. A station-side device comprising:
an optical communication interface to transmit and receive optical signals by time division to and from a plurality of subscriber-side devices; and
processing circuitry to
monitor the optical signals received by the optical communication interface,
detect a state in which the optical signals are being received for a predetermined period or longer as abnormal light emission in which the optical signals from one or more of the subscriber-side devices are not received,
sequentially select a subscriber-side device one at a time from the plurality of subscriber-side devices other than the one or more subscriber-side devices as a target subscriber-side device,
test whether or not the abnormal light emission is resolved by stopping transmission of the optical signal from each target subscriber-side device via the optical communication interface, and
specify, if the abnormal light emission is resolved, the target subscriber-side device being tested as a causative subscriber-side device, the causative subscriber-side device being a subscriber-side device that is a source of the abnormal light emission.