US 12,191,905 B2
Optical communication system and protection method for optical communication system
Shin Kaneko, Musashino (JP); Kazuaki Honda, Musashino (JP); Hiroo Suzuki, Musashino (JP); Junichi Kani, Musashino (JP); Takuya Kanai, Musashino (JP); and Yasunari Tanaka, Musashino (JP)
Assigned to NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
Appl. No. 18/022,887
Filed by NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
PCT Filed Aug. 24, 2020, PCT No. PCT/JP2020/031844
§ 371(c)(1), (2) Date Feb. 23, 2023,
PCT Pub. No. WO2022/044076, PCT Pub. Date Mar. 3, 2022.
Prior Publication US 2023/0308174 A1, Sep. 28, 2023
Int. Cl. H04J 14/02 (2006.01); H04B 10/032 (2013.01); H04B 10/079 (2013.01)
CPC H04B 10/032 (2013.01) [H04B 10/07957 (2013.01); H04J 14/0287 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An optical communication system comprising:
a plurality of wavelength variable communication devices capable of changing a wavelength of an optical signal to be transmitted;
a plurality of wavelength variable subscriber devices capable of changing a wavelength of an optical signal to be transmitted and received;
a wavelength routing device connected to each of the wavelength variable communication devices;
an optical multiplexing/demultiplexing device connected to each of the wavelength variable subscriber devices;
a plurality of optical fiber transmission paths connecting the wavelength routing device and the optical multiplexing/demultiplexing device; and
an optical distribution device provided between the wavelength routing device and the optical multiplexing/demultiplexing device, wherein
the wavelength routing device outputs an optical signal inputted from a port on the wavelength variable subscriber device side to a port uniquely determined by a combination of the wavelength of the optical signal and the port to which the optical signal is inputted,
the wavelength variable subscriber device is capable of executing a first protection for switching the wavelength of the optical signal to be transmitted and received to a spare wavelength different from an operating wavelength when the wavelength variable subscriber device and the wavelength variable communication device are disconnected, and
the optical distribution device is capable of executing a second protection for switching the optical fiber transmission path to be used when the wavelength variable subscriber device and the wavelength variable communication device are disconnected.