US2004114892A1PendingUtilityA1
Optical fiber
Priority: Dec 11, 2002Filed: Dec 11, 2002Published: Jun 17, 2004
Est. expiryDec 11, 2022(expired)· nominal 20-yr term from priority
G02B 6/03605G02B 6/03688G02B 6/0283G02B 6/03627
36
PatentIndex Score
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0
Claims
Abstract
An optical fiber is described in which the cladding is provided with a refractive index that increases in a radially outward direction. In particular embodiments the refractive index of the cladding increases monotonically from a low value to a value close to or higher Than the refractive index of the core. Such a fiber can be formed that can be operated in an effective single mode manner or in multimode operation and which is very suitable for use in high-bit-rate communication systems
Claims
exact text as granted — not AI-modified1 . An optical fiber comprising a central step-index or graded-index core region surrounded by an annular cladding region, wherein said cladding region is formed with a refractive index that increases in a radially outward direction.
2 . An optical fiber as claimed in claim 1 wherein the refractive index of said cladding region increases from a low value to a value close to or greater than the peak refractive index in the core.
3 . An optical fiber as claimed in claim 1 wherein said refractive index of said cladding region increases monotonically.
4 . An optical fiber as claimed in claim 1 wherein said refractive index of said cladding region increases in a step-like manner.
5 . An optical fiber as claimed in claim 1 wherein said refractive index of said cladding region increases in accordance with a power law, wherein:
n
2
(
r
)
=
n
1
2
[
1
-
2
Δ
(
b
a
-
r
a
b
a
-
1
)
q
]
where n(r)=the refractive index at a radius r
n 1 =the refractive index in the core
n 2 =the refractive index at radius a
a=the radius of the core
b=the radius of the cladding region, and
e=the profile shape parameter (q>0), and
Δ = n 1 2 - n 2 2 2 n 1 2 .
6 . An optical fiber as claimed in claim 1 wherein the refractive index of said cladding region increases exponentially or in a Gaussian manner.
7 . An optical fiber as claimed in claim 1 wherein said fiber is adapted to be operated in effective single-mode operation.
8 . An optical fiber as claimed in claim 1 wherein said fiber is adapted to be operated in effective multimode operation.
9 . A method of transmitting data through an optical fiber, comprising providing a fiber having a central step-index or graded-index core region surrounded by an annular cladding region, wherein said cladding region is formed with a refractive index that increases in a radially outward direction, and operating said fiber in an effective single-mode manner.
10 . A method of transmitting data through an optical fiber, comprising providing a fiber having a central step-index or graded-index core region surrounded by an annular cladding region, wherein said cladding region is formed with a refractive index that increases in a radially outward direction, and operating said fiber in a multimode manner.Join the waitlist — get patent alerts
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