Back to results
US 9,529,146 B2Granted
Multicore fiber and method of manufacture of the same
AssigneeFujikura Ltd.
InventorsItaru Ishida, Shoichiro Matsuo
Life of this patent
Estimating the term…
Abstract
A multicore fiber includes a plurality of cores and a cladding that encloses the plurality of the cores. The plurality of the cores is arranged and disposed on a linear line passed through the center of the cladding. A difference in the cutoff wavelength between an outer core located at the outermost position and an inner core located next to the outer core is set at a wavelength of 100 nm or less.
Claims10
A method of manufacture of a multicore fiber comprising:
- boring a plurality of through holes in a cladding rod so that the through holes along a longitudinal direction of the cladding rod are arranged and disposed on a linear line passed through a center of the cladding rod;
- inserting a core enclosed rod that a core rod is enclosed with a glass layer individually into the plurality of the through holes;
- heating the cladding rod and the core enclosed rod and integrally forming the cladding rod with the core enclosed rod;
- and
- drawing the rods integrally formed in the heating, wherein
- the plurality of the through holes includes a pair of outer through holes located at outermost positions and one or more of inner through holes sandwiched between the pair of the through holes,
- in the inserting, a first space between the core enclosed rod and the inner through hole in a first direction, in which the plurality of the through holes is arranged, is made smaller than a second space between the core enclosed rod and the inner through hole in a second direction orthogonal to the first direction, and
- a difference between the first space and the second space is set greater than a difference between a third space and a fourth space, the third space being between the core enclosed rod and the outer through hole in the first direction, the fourth space being between the core enclosed rod and the outer through hole in the second direction.
5 more elements
A method of manufacture of a multicore fiber comprising:
- boring a plurality of through holes in a cladding rod so that the through holes along a longitudinal direction of the cladding rod are arranged and disposed on a linear line passed through a center of the cladding rod;
- inserting a core enclosed rod that a core rod is enclosed with a glass layer individually into the plurality of the through holes;
- heating the cladding rod and the core enclosed rod and integrally forming the cladding rod with the core enclosed rod;
- and
- drawing the rods integrally formed in the heating, wherein
- the plurality of the through holes includes a pair of outer through holes located at outermost positions and one or more of inner through holes sandwiched between the pair of the through holes, and
- in the boring, a pair of stress buffering holes filled in the integrating is bored in the second direction as the inner through hole is sandwiched.
4 more elements
A method of manufacture of a multicore fiber comprising:
- boring a plurality of through holes in a cladding rod so that the through holes along a longitudinal direction of the cladding rod are arranged and disposed on a linear line passed through a center of the cladding rod;
- inserting a core enclosed rod that a core rod is enclosed with a glass layer individually into the plurality of the through holes;
- heating the cladding rod and the core enclosed rod and integrally forming the cladding rod with the core enclosed rod;
- and
- drawing the rods integrally formed in the heating, wherein
- the plurality of the through holes includes a pair of outer through holes located at outermost positions and one or more of inner through holes sandwiched between the pair of the through holes,
- the core rod in the core enclosed rod inserted into the outer through hole in the inserting includes a diameter in a first direction, in which the plurality of the through holes is arranged, almost same as a diameter in a second direction orthogonal to the first direction, and
- the core rod in the core enclosed rod inserted into the inner through hole in the inserting includes a diameter in the first direction smaller than a diameter in the second direction.
5 more elements
Dependencies are inferred from the claim text.