Dispersion-controlled optical fiber
First Claim
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1. A dispersion-controlled optical fiber comprising:
- a center core having a refractive index N1 for forming a passageway for transmitting optical signals;
a cladding having a refractive index N0 for enclosing said center core;
an upper core surrounding said center core and having a refractive index distribution increased starting from a refractive index N2 at its outer circumference to the refractive index N1 at its internal circumference; and
, a minutely depressed refractive index region having a reflective index N3 and interposed between said upper core and cladding, wherein the refractive index N3 is lower than the refractive index N0, wherein the internal radius a and external radius b of said upper core, and the internal radius c of said cladding meet with the relationships;
0.06≦
a/b≦
0.8 and 0.02≦
a/c≦
0.9.
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Abstract
Disclosed is an optical fiber comprising a center core which forms a passageway for transmitting optical signals and has a refractive index N1, and a cladding which encloses the center core and has a refractive index N0. The optical fiber further comprises an upper core, which has a distribution of refractive indices increased starting from a refractive index N2 (>N0) at its outer circumference to the refractive index N1 at its internal circumference, and a minutely depressed refractive index region, which is interposed between said upper core and cladding and has a refractive index N3. The refractive index N3 is lower than the refractive index N0.
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Citations
11 Claims
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1. A dispersion-controlled optical fiber comprising:
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a center core having a refractive index N1 for forming a passageway for transmitting optical signals;
a cladding having a refractive index N0 for enclosing said center core;
an upper core surrounding said center core and having a refractive index distribution increased starting from a refractive index N2 at its outer circumference to the refractive index N1 at its internal circumference; and
,a minutely depressed refractive index region having a reflective index N3 and interposed between said upper core and cladding, wherein the refractive index N3 is lower than the refractive index N0, wherein the internal radius a and external radius b of said upper core, and the internal radius c of said cladding meet with the relationships;
0.06≦
a/b≦
0.8 and 0.02≦
a/c≦
0.9. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A dispersion-controlled optical fiber comprising:
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a loss not exceeding 0.25 dB/km, a cutoff wavelength not exceeding 1400 nm, and a dispersion slope not exceeding 0.08 ps/nm2·
km at the wavelength of 1550 nm;
a dispersion value not less than 0.1 ps/nm·
km at the wavelength of 1400 nm;
a dispersion value not exceeding 16 ps/nm·
km at the wavelength of 1625 nm; and
a mode field diameter not less than 8.2 μ
m at the wavelength of 1550 nm, so that the optical fiber has suitable optical characteristics for wavelength-division multiplexing transmission using a wavelength band of 1400˜
1625 nm. - View Dependent Claims (11)
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Specification