Low bend loss optical fiber with high modulus coating
First Claim
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1. An optical fiber for transmitting optical signals comprised of light, the optical fiber comprising:
- a core region disposed about a longitudinal centerline and having a refractive index profile with a first maximum relative refractive index Δ
1;
a cladding region surrounding the core region, wherein the cladding region comprises an inner annular portion surrounding and in contact with the core region, a ring portion surrounding and in contact with the inner annular portion, and an outer annular portion surrounding and in contact with the ring portion, the inner annular portion comprising a second maximum relative refractive index Δ
2, the ring portion comprising a minimum refractive index Δ
MIN, and the outer annular portion comprising a third maximum relative refractive index Δ
3, wherein Δ
1>
Δ
2 >
Δ
MIN, and A3>
Δ
MIN, and Δ
1>
Δ
3, wherein the outer annular portion comprises an outermost glass periphery; and
a coating surrounding and in direct contact with the outermost glass periphery of the cladding region, the coating having a Young'"'"'s modulus of elasticity greater than 30 MPa;
wherein the optical fiber exhibits a microbend induced loss of less than 5 dB at a wavelength of 1550 nm as measured by a lateral load wire mesh test.
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Abstract
Optical fiber having a coating surrounding and in direct contact with the silica based cladding region of the fiber, the coating having a Young'"'"'s modulus of elasticity greater than 30 MPa. The optical fiber has low bend losses, especially low microbend induced losses. The optical fiber has a core surrounded by a cladding, and the cladding has a ring portion that includes holes or doped silica or both.
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Citations
22 Claims
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1. An optical fiber for transmitting optical signals comprised of light, the optical fiber comprising:
-
a core region disposed about a longitudinal centerline and having a refractive index profile with a first maximum relative refractive index Δ
1;a cladding region surrounding the core region, wherein the cladding region comprises an inner annular portion surrounding and in contact with the core region, a ring portion surrounding and in contact with the inner annular portion, and an outer annular portion surrounding and in contact with the ring portion, the inner annular portion comprising a second maximum relative refractive index Δ
2, the ring portion comprising a minimum refractive index Δ
MIN, and the outer annular portion comprising a third maximum relative refractive index Δ
3, wherein Δ
1>
Δ
2 >
Δ
MIN, and A3>
Δ
MIN, and Δ
1>
Δ
3, wherein the outer annular portion comprises an outermost glass periphery; anda coating surrounding and in direct contact with the outermost glass periphery of the cladding region, the coating having a Young'"'"'s modulus of elasticity greater than 30 MPa; wherein the optical fiber exhibits a microbend induced loss of less than 5 dB at a wavelength of 1550 nm as measured by a lateral load wire mesh test. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An optical fiber for transmitting optical signals comprised of light, the optical fiber comprising:
-
a core region disposed about a longitudinal centerline and having a refractive index profile with a first maximum relative refractive index Δ
1;a cladding region surrounding the core region, the cladding region comprising a hole-free inner annular portion surrounding and in contact with the core region, a hole-containing ring portion surrounding and in contact with the inner annular portion, and a hole-free outer annular portion surrounding and in contact with the ring portion, the inner annular portion comprising a second maximum relative refractive index Δ
2, and the outer annular portion comprising a third maximum relative refractive index Δ
3, wherein Δ
1>
Δ
2, and Δ
1>
Δ
3, and wherein the ring region provides internal reflection sufficient to guide the light along an axial length of the core region; anda coating surrounding and in direct contact with the outer annular portion of the cladding region, the coating having a Young'"'"'s modulus of elasticity greater than 30 MPa; wherein the optical fiber exhibits a microbend induced loss of less than 5 dB at a wavelength of 1550 nm as measured by a lateral load wire mesh test.
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19. An optical fiber for transmitting optical signals comprised of light, the optical fiber comprising:
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a core region disposed about a longitudinal centerline and having a refractive index profile with a first maximum relative refractive index Δ
1;a cladding region surrounding the core region, the cladding region comprising an outermost glass periphery and a hole-containing ring portion surrounding the core region; and a coating surrounding and in direct contact with the outermost glass periphery of the cladding region, the coating having a Young'"'"'s modulus of elasticity greater than 30 MPa; wherein the optical fiber exhibits a microbend induced loss of less than 5 dB at a wavelength of 1550 nm as measured by a lateral load wire mesh test. - View Dependent Claims (20, 21, 22)
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Specification