US 11,711,150 B2Granted

Optical communication system and optical communication method

AssigneeNippon Telegraph and Telephone Corporation

InventorsAtsuko Kawakita, Kazutaka Hara, Yasutaka Kimura, Kenji Horikawa, Hiroyuki Furukawa

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Abstract

An object is to provide an optical communication system and an optical communication method that are capable of, when assigning wavelengths on a per-service basis and providing services on a per-area basis, preventing degradation of signal quality due to linear crosstalk and preventing an increase in cost and size. An optical communication system according to the present invention includes an optical splitter 300 connecting N first ports and M second ports by a combination of 2×2 fiber optical splitters, N and M each being an integer of two or more, where wavelengths of optical signals to be received are limited for each group of optical receivers 106, by using a correlation between a fused extension length of at least one 2×2 fiber optical splitter directly connected to the first port, among the 2×2 fiber optical splitters, and wavelength output characteristics of the second port of the optical splitter 300.

Claims9

Dependent claims

An optical communication system comprising:

an optical splitter connecting N first ports and M second ports by a combination of 2×2 fiber optical splitters, N being an integer of two or more, M being an integer of two or more;
optical transmitters for either:
inputting optical signals of different wavelengths to respective ones of the first ports of the optical splitter;
or
inputting a multiplexed-wavelength optical signal to at least one of the first ports of the optical splitter;
and
optical receivers for receiving a single-wavelength optical signal of the optical signals of different wavelengths or the multiplexed-wavelength optical signal that is output to respective ones of the second ports of the optical splitter, wherein
wavelengths of the optical signals to be received are limited for each group of the optical receivers, by using a correlation between a fused extension length of at least one of the 2×2 fiber optical splitters that is directly connected to the first ports, among the 2×2 fiber optical splitters of the optical splitter, and wavelength output characteristics of the second ports of the optical splitter,
wherein, in relation to the optical splitter,
N is four and M is four, and the first ports and the second ports are connected by a combination of three of the 2×2 fiber optical splitters,
second and third ones of the first ports are connected to respective input sides of a first one of the 2×2 fiber optical splitters,
a first one of the first ports and one of output sides of the first one of the 2×2 fiber optical splitters are connected to respective input sides of a second one of the 2×2 fiber optical splitters,
a fourth one of the first ports and another one of the output sides of the first one of the 2×2 fiber optical splitters are connected to respective input sides of a third one of the 2×2 fiber optical splitters,
output sides of the second one of the 2×2 fiber optical splitters are connected to first and second ones of the second ports, respectively, and
output sides of the third one of the 2×2 fiber optical splitters are connected to third and fourth ones of the second ports, respectively.

12 more elements

An optical communication system comprising:

an optical splitter connecting N first ports and M second ports by a combination of 2×2 fiber optical splitters, N being an integer of two or more, M being an integer of two or more;
optical transmitters for either:
inputting optical signals of different wavelengths to respective ones of the first port of the optical splitter;
or
inputting a multiplexed-wavelength optical signal to at least one of the first ports of the optical splitter;
and
optical receivers for receiving a single-wavelength optical signal of the optical signals of different wavelengths or the multiplexed-wavelength optical signal that is output to respective ones of the second ports of the optical splitter, wherein
wavelengths of the optical signals to be received are limited for each group of the optical receivers, by using a correlation between a fused extension length of at least one of the 2×2 fiber optical splitters that is directly connected to the first ports, among the 2×2 fiber optical splitters of the optical splitter, and wavelength output characteristics of the second ports of the optical splitter,
wherein, in relation to the optical splitter,
N is four and M is four, and the first ports and the second ports are connected by a combination of three of the 2×2 fiber optical splitters,
first and second ones of the first ports are connected to respective input sides of a first one of the 2×2 fiber optical splitters,
a third one of the first ports and one of output sides of the first one of the 2×2 fiber optical splitters are connected to respective input sides of a second one of the 2×2 fiber optical splitters,
a fourth one of the first ports and one of output sides of the second one of the 2×2 fiber optical splitters are connected to respective input sides of a third one of the 2×2 fiber optical splitters,
another one of the output sides of the first one of the 2×2 fiber optical splitters is connected to a first one of the second ports,
another one of the output sides of the second one of the 2×2 fiber optical splitters is connected to a second one of the second ports, and
output sides of the third one of the 2×2 fiber optical splitters are connected to third and fourth ones of the second ports, respectively.

13 more elements

An optical communication method performed by an optical splitter connecting N first ports and M second ports by a combination of 2×2 fiber optical splitters, N being an integer of two or more, M being an integer of two or more,

the method comprising outputting, to respective ones of the second ports, as a single wavelength optical signal of optical signals of different wavelengths or a multiplexed-wavelength optical signal, the optical signals of different wavelengths input to respective ones of the first ports or the multiplexed-wavelength optical signal input to at least one of the first ports, wherein
wavelength output characteristics of the second ports of the optical splitter are controlled based on a fused extension length of at least one of the 2×2 fiber optical splitters that is directly connected to the first ports, among the 2×2 fiber optical splitters of the optical splitter, and wavelengths of the optical signals to be received are limited for each group of optical receivers connected to the second ports of the optical splitter,
wherein, in relation to the optical splitter,
N is four and M is four, and the first ports and the second ports are connected by a combination of three of the 2×2 fiber optical splitters,
second and third ones of the first ports are connected to respective input sides of a first one of the 2×2 fiber optical splitters,
a first one of the first ports and one of output sides of the first one of the 2×2 fiber optical splitters are connected to respective input sides of a second one of the 2×2 fiber optical splitters,
a fourth one of the first ports and another one of the output sides of the first one of the 2×2 fiber optical splitters are connected to respective input sides of a third one of the 2×2 fiber optical splitters,
output sides of the second one of the 2×2 fiber optical splitters is connected to first and second ones of the second ports, respectively, and
output sides of the third one of the 2×2 fiber optical splitters are connected to third and fourth ones of the second ports, respectively.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/437,925Filed 6 Mar 2020
Priority: JP 2019-05209420 Mar 2019
Published: US 2022/0173813 A12 Jun 2022
Granted: 25 Jul 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

G02B 6/29332
Operating by evanescent wave coupling: wavelength selective couplers, i.e. based on evanescent coupling between light guides, e.g. fused fibre…
H04B 10/572
Transmitters: wavelength control
G02B 6/287
Having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals:…
G02B 6/2938
Characterised by the function or use of the complete device: for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g.…