Wavelength multiplexing communication system and wavelength multiplexing communication method

Patent metadata

Field	Value
Publication number	US-2023155712-A1
Application number	US-202017908223-A
Country	US
Kind code	A1
Filing date	Mar 2, 2020
Priority date	Mar 2, 2020
Publication date	May 18, 2023
Grant date	—

Abstract

A wavelength multiplexing communication system includes a master station apparatus and a plurality of slave station apparatuses. The master station apparatus includes a wavelength multiplexing communication unit that performs wavelength multiplexing communication with the plurality of slave station apparatuses by wavelengths the number of which is equal to or less than the number of the plurality of slave station apparatuses using an optical signal of a wavelength in a first wavelength group and an optical signal of a wavelength in a second wavelength group. The slave station apparatuses include an optical communication unit that performs communication of the main signal with the master station apparatus by an optical signal of a wavelength in the first wavelength group, which is different from a wavelength in the first wavelength group used by another slave station when the main signal communication is performed in the host slave station apparatus, and performs communication of a signal other than the main signal with the master station apparatus by an optical signal of a wavelength in the second wavelength group, which is a wavelength same as a wavelength used by another slave station apparatus when the main signal communication is not performed in the host slave station apparatus.

First claim

1 . A wavelength multiplexing communication system comprising:
a master station apparatus; and a plurality of slave station apparatuses, wherein the master station apparatus includes a wavelength multiplexing communication unit configured to perform wavelength multiplexing communication with the plurality of slave station apparatuses by using an optical signal of a wavelength in a first wavelength group and an optical signal of a wavelength in a second wavelength group, with the number of wavelengths equal to or less than the number of the plurality of slave station apparatuses, and a slave station apparatus of the plurality of slave station apparatuses includes an optical communication unit configured to, when main signal communication is performed in the slave station apparatus, perform communication of a main signal with the master station apparatus by an optical signal of a wavelength in the first wavelength group, the wavelength in the first wavelength group being different from a wavelength in the first wavelength group used by another slave station apparatus of the plurality of slave station apparatuses, and when the main signal communication is not performed in the slave station apparatus, perform communication of a signal other than the main signal with the master station apparatus by an optical signal of a wavelength in the second wavelength group, the wavelength in the second wavelength group being a wavelength same as a wavelength used by another slave station apparatus of the plurality of slave station apparatuses.

2 . The wavelength multiplexing communication system according to claim 1 ,
wherein, when the main signal communication is performed in the slave station apparatus, the optical communication unit performs communication of the main signal with the master station apparatus by an optical signal of a wavelength in the first wavelength group, the wavelength in the first wavelength group being different from a wavelength in the first wavelength group used by another slave station apparatus of the plurality of slave station apparatuses, and performs communication of a signal other than the main signal with the master station apparatus by an optical signal of a wavelength in the second wavelength group, the wavelength in the second wavelength group being a wavelength same as a wavelength used by another slave station apparatus of the plurality of slave station apparatuses.

3 . The wavelength multiplexing communication system according to claim 2 ,
wherein a wavelength in the second wavelength group is fixed and assigned to the slave station apparatuses.

4 . The wavelength multiplexing communication system according to claim 1 ,
wherein, when the main signal communication is performed in the slave station apparatus, the optical communication unit performs communication of the main signal and communication of a signal other than the main signal with the master station apparatus by an optical signal of a wavelength in the first wavelength group, the wavelength in the first wavelength group being a wavelength different from a wavelength in the first wavelength group used by another slave station.

5 . The wavelength multiplexing communication system according to claim 1 , further comprising
a wavelength assignment unit configured to assign different wavelengths in the first wavelength group to the slave station apparatuses in which the main signal is generated, respectively.

6 . The wavelength multiplexing communication system according to claim 5 ,
wherein the wavelength assignment unit dynamically assigns different wavelengths in the first wavelength group to the slave station apparatuses in which the main signal is generated, respectively.

7 . The wavelength multiplexing communication system according to claim 1 ,
wherein the wavelength multiplexing communication unit includes a plurality of optical signal terminations that terminate optical signals of different wavelengths, and the number of the optical signal terminations included in the wavelength multiplexing communication unit is a total of a maximum value of the number of the slave station apparatuses that perform communication of the main signal at the same time and the number of wavelengths in the second wavelength group.

8 . A wavelength multiplexing communication method in a wavelength multiplexing communication system including a master station apparatus and a plurality of slave station apparatuses,
the method comprising: performing, by the master station apparatus, wavelength multiplexing communication with the plurality of slave station apparatuses by using an optical signal of a wavelength in a first wavelength group and an optical signal of a wavelength in a second wavelength group, with the number of wavelengths equal to or less than the number of the plurality of slave station apparatuses; and performing, by a slave station apparatus of the plurality of slave station apparatuses, when main signal communication is performed in the slave station apparatus, communication of a main signal with the master station apparatus by an optical signal of a wavelength in the first wavelength group, the wavelength in the first wavelength group being different from a wavelength in the first wavelength group used by another slave station apparatus of the plurality of slave station apparatuses, and, when the main signal communication is not performed in the slave station apparatus, communication of a signal other than the main signal with the master station apparatus by an optical signal of a wavelength in the second wavelength group, the wavelength in the second wavelength group being a wavelength same as a wavelength used by another slave station apparatus of the plurality of slave station apparatuses.

Assignees

• Nippon Telegraph & Telephone

Inventors

• HARADA Rintaro
• Ujikawa Hirotaka
• Kaneko Shin
• Terada Jun

Classifications

• H04B10/272

  Star-type networks {or tree-type networks} · CPC title

• H04J14/0206 Primary

  Express channels arrangements · CPC title

• H04J14/0213

  Groups of channels or wave bands arrangements · CPC title

• H04J14/0241

  Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths · CPC title

• H04J14/02

  Wavelength-division multiplex systems · CPC title