Multi-core fiber
AssigneesFujikura Ltd., National University Corporation Hokkaido University
InventorsYusuke Sasaki, Katsuhiro Takenaga, Kunimasa Saitoh
Life of this patent
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Abstract
A multi-core fiber performs communication using light up to an xth-order LP mode (where x is an integer of 1 or more) in a communication band. The multi-core fiber includes: a plurality of signal light propagation cores that propagate light up to an (x+1)th-order LP mode; and at least one high-loss core that has a higher loss of propagated light than the signal light propagation cores. Crosstalk occurs between light of the (x+1)th-order LP mode propagated through at least one signal light propagation core and light of a primary LP mode propagated through at least one high-loss core.
Claims4
A multi-core fiber for performing communication using light up to an xth-order LP mode (where x is an integer of 1 or more) in a communication band, the multi-core fiber comprising:
- a plurality of signal light propagation cores that propagate light up to an (x+1)th-order LP mode;
- and
- at least one high-loss core that has a higher loss of propagated light than the signal light propagation cores, wherein
- crosstalk occurs between light of the (x+1)th-order LP mode propagated through at least one signal light propagation core and light of a primary LP mode propagated through at least one high-loss core, and
- a distance between the signal light propagation cores adjacent to each other is a distance at which crosstalk of the light up to the xth-order LP mode becomes less than or equal to −40 dB/km and crosstalk of the light of the (x+1)th-order LP mode becomes greater than or equal to −30 dB/km.
A multi-core fiber for performing communication using light up to an xth-order LP mode (where x is an integer of 1 or more) in a communication band, the multi-core fiber comprising:
- a plurality of signal light propagation cores that propagate light up to an (x+1)th-order LP mode;
- and
- at least one high-loss core that has a higher loss of propagated light than the signal light propagation cores, wherein
- crosstalk occurs between light of the (x+1)th-order LP mode propagated through at least one signal light propagation core and light of a primary LP mode propagated through at least one high-loss core, and
- the high-loss core is disposed at a position surrounded by the three or more signal light propagation cores.
A multi-core fiber for performing communication using light up to an xth-order LP mode (where x is an integer of 1 or more) in a communication band, the multi-core fiber comprising:
- a plurality of signal light propagation cores that propagate light up to an (x+1)th-order LP mode;
- at least one high-loss core that has a higher loss of propagated light than the signal light propagation cores;
- and
- an extension portion that extends such that diameters of the plurality of signal light propagation cores decrease, in a part of the plurality of signal light propagation cores, in a longitudinal direction, wherein
- crosstalk occurs between light of the (x+1)th-order LP mode propagated through at least one signal light propagation core and light of a primary LP mode propagated through at least one high-loss core, and
- in the extension portion, the plurality of signal light propagation cores propagate the light up to the xth-order LP mode and propagation of the light of the (x+1)th-order LP mode is suppressed.
Dependencies are inferred from the claim text.