US2017192167A1PendingUtilityA1
High Backscattering Waveguides
Est. expiryJun 8, 2035(~8.9 yrs left)· nominal 20-yr term from priority
G01N 21/47G02B 6/02G02B 6/0208G02B 6/02052G01B 11/18G01B 9/0209
66
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Claims
Abstract
A high backscattering fiber comprising a perturbed segment in which the perturbed segment reflects a relative power that is more than three (3) decibels (dB) above Rayleigh scattering. The high backscattering fiber also exhibits a coupling loss of less than 0.5 dB.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . A high backscattering fiber, comprising:
a coupling loss of less than 0.5 decibels (dB) when coupled to a transmission fiber; and a perturbed segment comprising an index perturbation (Δn(x, y, z)) that causes reflection of relative power (R p→r (λ, z, l)) that is greater than three (3) dB above Rayleigh scattering.
2 . The fiber of claim 1 , wherein:
R
p
→
r
(
λ
,
z
,
l
)
≈
1
l
μ
p
,
r
2
π
λ
∫
z
-
1
2
z
+
1
2
Δ
n
z
(
z
′
)
e
i2
π
z′
n
eff
,
p
+
n
eff
,
r
λ
dz
′
2
,
l represents an integration length;
n eff,p represents an effective index corresponding to p;
n eff,r represents an effective index corresponding to r;
μ p,r represents a modal overlap coefficient such that:
μ
p
,
r
:
=
∫
∫
-
∞
∞
E
p
(
x
,
y
)
Δ
n
x
,
y
(
x
,
y
)
E
r
⋆
(
x
,
y
)
dxdy
∫
∫
-
∞
∞
E
p
(
x
,
y
)
2
dxdy
∫
∫
-
∞
∞
E
r
(
x
,
y
)
2
dxdy
,
wherein:
E p (x,y) represents eigenmodes of p;
E r (x,y) represents eigenmodes of r; and
E r *(x,y) represents the conjugate transpose of E r (x,y).
3 . The fiber of claim 1 , wherein R p→r (λ, z, l) is greater than 10 dB above Rayleigh scattering for wavelengths (λ) of:
1542.5 nm≦λ≦1557.5 nm
4 . The fiber of claim 1 further comprising an optical pump, the optical pump having a wavelength outside of the range of wavelengths for which relative power is greater than 3 dB above Rayleigh scattering.
5 . The fiber of claim 1 , wherein:
n (total) ( x,y,z )= n x,y ( x,y )+Δ n (total) ( x,y,z ),
wherein; n x,y (x,y) represents an unperturbed refractive index;
Δ n (total) ( x,y,z )=Δ n (Rayleigh) ( x,y,z )+Δ n ( x,y,z );
Δn(x, y, z) represents a transverse dependence of the index perturbation; and Δn z (z) represents a longitudinal dependence of the index perturbation.
6 . The fiber of claim 5 , wherein:
Δ n ( x,y,z )≧2·10 −7 ; and
the sensor has a total sensor length that exceeds 119.5 centimeters (cm).
7 . The fiber of claim 5 , wherein:
Δ n ( x,y,z )≧2·10 −7 ; and
R p→r (λ, z, l)≧−80 dB/mm in a wavelength (λ) range of 1550±7.5 nanometers (nm),
wherein:
l=1 millimeter (mm).
8 . The fiber of claim 5 , wherein:
Δ n ( x,y,z )≧2·10 −6 ;
l≈0.3 millimeters (mm) R p→r (λ, z, l)≧−60 dB·(1/mm) in a wavelength (λ) range of 1550±7.5 nanometers (nm).
9 . The fiber of claim 5 , wherein:
Δ n ( x,y,z )≧2·10 −7 .Join the waitlist — get patent alerts
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