Abstract

A method for manufacturing a preform for a multicore fiber, including stacking (S1) a plurality of core rods and a plurality of silica-based filler rods in a tube; collapsing (S2) the tube around the stack of core rods and silica-based filler rods, forming a collapsed stack; depositing (S3) a layer of silica around the collapsed stack; removing (S4) at least part of the deposited layer of silica. The preferential process for depositing a layer of silica around the collapsed stack and removing at least part of the deposited layer of silica is Advanced Plasma and Vapor Deposition.

IPC Classes  ?

• C03B 37/012 - Manufacture of preforms for drawing fibres or filaments

Abstract

3)<50%.

IPC Classes  ?

• G02B 6/02 - Optical fibres with cladding
• G02B 6/00 - Light guidesStructural details of arrangements comprising light guides and other optical elements, e.g. couplings
• G02B 6/036 - Optical fibres with cladding core or cladding comprising multiple layers

Abstract

−3.

IPC Classes  ?

• G02B 6/028 - Optical fibres with cladding with core or cladding having graded refractive index
• G02B 6/02 - Optical fibres with cladding
• G02B 6/036 - Optical fibres with cladding core or cladding comprising multiple layers

Abstract

−3.

IPC Classes  ?

• G02B 6/028 - Optical fibres with cladding with core or cladding having graded refractive index
• G02B 6/02 - Optical fibres with cladding
• G02B 6/036 - Optical fibres with cladding core or cladding comprising multiple layers
• H04J 14/04 - Mode multiplex systems

Abstract

Cl, said ovality criterion o being defined by the following equation: where a is a length of a semi-major axis of said circumference and b is a length of a semi-minor axis of said circumference.

IPC Classes  ?

• G02B 6/028 - Optical fibres with cladding with core or cladding having graded refractive index
• G02B 6/036 - Optical fibres with cladding core or cladding comprising multiple layers

Abstract

−1; with Δn1 and Δn2 the refractive-index difference respectively of the center part of the optical core and of the cladding part adjacent to the optical core, with respect to the outer optical cladding.

IPC Classes  ?

• G02B 6/02 - Optical fibres with cladding
• G02B 6/028 - Optical fibres with cladding with core or cladding having graded refractive index
• H04B 10/2581 - Multimode transmission

Abstract

A multimode optical fiber (10) comprises an a-profile graded index core, a trench (13) surrounding the core (11) and an intermediate cladding (12) between the core and the trench. Such a multimode optical fiber (10) has: —A mode carrying capacity between 54 and 68 LP modes at 1060 nm, defined by a specific relationship between the numerical aperture of the core and the core radius, —A defined relationship between trench, core and intermediate cladding parameters to achieve a high bandwidth and low bend-loss at 1060 nm, and—A core radius between 24 and 26 μm, a numerical aperture between 0.190 and 0.225 and a value of a between 2.01 and 2.05 to retain compatibility with legacy fibers.

IPC Classes  ?

• G02B 6/028 - Optical fibres with cladding with core or cladding having graded refractive index
• G02B 6/036 - Optical fibres with cladding core or cladding comprising multiple layers

Abstract

The invention concerns a bending-loss single mode optical fibre having a Mode Field Diameter at 1310nm greater than or equal to 9 microns and having a core and a cladding, the core refractive index profile having a trapezoid-like shape. According to an aspect of the invention, the cladding comprises a shallow trench with a refractive index difference Ant between -2x10-3and -0.9x10-3011 of the core is between 0.1 and 0.6, preferably between 0.2 and 0.5, more preferably between 0.25 and 0.45; the core surface integral Formula (I) is between 20.10 3 μm and 24.10-3μm and the cladding surface integral Formula (II) is between -25x10-3μm and -9x10-3μm, where Δn(r) is the refractive-index difference with respect to said outer cladding as a function of the radius r, and said single mode optical fibre fulfils the following criterion : 25.7X 10-3010202≤ 26.8x l0-3.

IPC Classes  ?

• G02B 6/028 - Optical fibres with cladding with core or cladding having graded refractive index
• G02B 6/036 - Optical fibres with cladding core or cladding comprising multiple layers

Abstract

3)<50%.

IPC Classes  ?

• G02B 6/02 - Optical fibres with cladding
• G02B 6/00 - Light guidesStructural details of arrangements comprising light guides and other optical elements, e.g. couplings
• G02B 6/036 - Optical fibres with cladding core or cladding comprising multiple layers

Abstract

A few mode optical fiber comprises an optical core and an optical cladding surrounding the optical core. The FM F has a step-index profile. The optical core has a core outer radius R1 > 7.5μm and a core refractive index difference Δη1 such that 14.5x 10-3 < Δη1 < 24x 10-3. The optical cladding comprises: - an index ring with: o a ring inner radius Rr1 between 12μm and 19μm; o a ring refractive index difference Δη1 such that Δη1 / Δηr between 2 and 4; o a ring volume Vring =πΔηr (Rr22— Rr12) between 1.8μm2 and 4.1μm2 where Rr2 is the ring outer radius; an inner cladding between the optical core and the index ring, with an inner cladding inner radius Ri1 and an inner cladding outer radius Ri2, the inner cladding having an inner cladding refractive index difference Δηclad1 between—1.0x10-3 and 1.0x10-3.

IPC Classes  ?

• G02B 6/02 - Optical fibres with cladding
• G02B 6/036 - Optical fibres with cladding core or cladding comprising multiple layers

Abstract

A multimode optical fiber (10) comprises an a-profile graded index core, a trench (13) surrounding the core (11) and an intermediate cladding (12) between the core and the trench. Such a multimode optical fiber (10) has: - A mode carrying capacity between 54 and 68 LP modes at 1060nm, defined by a specific relationship between the numerical aperture of the core and the core radius, - A defined relationship between trench, core and intermediate cladding parameters to achieve a high bandwidth and low bend-loss at 1060 nm, and - A core radius between 24 and 26μm, a numerical aperture between 0.190 and 0.225 and a value of a between 2.01 and 2.05 to retain compatibility with legacy fibers.

IPC Classes  ?

• G02B 6/028 - Optical fibres with cladding with core or cladding having graded refractive index
• G02B 6/036 - Optical fibres with cladding core or cladding comprising multiple layers

Abstract

An optical fiber (10) comprises an optical core (11) and an optical cladding (30, 50) surrounding the optical core, the optical core having a single α graded-index profile with α ≥1, α being a non-dimensional parameter that defines the index profile shape of the optical core, and the optical core having a maximal refractive index nco at its center; the optical cladding has at its outer edge a refractive index ncl, and comprises a region (12) of depressed refractive index ntrench, called a trench, with a negative refractive index difference Δnt = ntrench— ncl with respect to said optical cladding, the trench having an outer radius Rtrench - According to embodiments of the disclosure, the optical core and cladding are configured to support propagation of at least six spatial modes and at maximum fifty-five spatial modes at an operating wavelength λορ between, and including, 1460 nm and 1675 nm, and the optical core satisfies an ovality criterion between 0.05 and 0.3, when said ovality criterion is measured at a circumference of equal index neq within said core, such that Δneq = neq— ncl is less than 75% of Δnco = nco— ncl, said ovality criterion o being defined by the following equation: 0 = a — b / a + b where a is a length of a semi-major axis of said circumference and b is a length of a semi-minor axis of said circumference.

IPC Classes  ?

• G02B 6/028 - Optical fibres with cladding with core or cladding having graded refractive index

Abstract

The invention relates to an optical fiber 1 comprising a core 2 and a cladding 3 surrounding the core 2 and having an outer diameter of 125μm, the optical fiber 1 comprising a cured primary coating 4 directly surrounding the cladding 3 and a cured secondary coating 5 directly surrounding the cured primary coating 4, said cured primary coating 4 having a thickness t1 between 10 and 18μm and an in-situ tensile modulus Emod1 between 0.10 and 0.18 MPa, said cured secondary coating 5 having a thickness t2 lower or equal to 18μm and an in-situ tensile modulus Emod2 between 700 and 1200 MPa, wherein said first and second thicknesses and said first and second in- situ tensile moduli satisfy the following equation: 4% < (t1 x t2 x Emod1x Emod2 3) / (t1_norm x t2_norm x Emod1_norm x Emod2_norm 3)< 50%

IPC Classes  ?

• G02B 6/02 - Optical fibres with cladding
• G02B 6/036 - Optical fibres with cladding core or cladding comprising multiple layers