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US3646462A Expired / Lapsed US ⏱️ 0.0 years remaining

Fiber for distortion-free propagation

Assignee: American Optical Corp
•
Filing: 1969-11-14
•
Granted: 1972-02-29
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Expires: 1989-11-14
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Abstract

Abstract A fiber for use in the propagation of light pulses with the attendant elimination of distortion. The fiber is useful as a delay line storage device for computer information with an extremely high-packing density capability for the bits of information. Another application is in a broadband communication system as a transmission line and in any application the fiber may be ''''active'''' as either a laser amplifier or oscillator. Basically, the invention involves the choice of fiber core and cladding size and other parameters to counteract, with the anomalous dispersion associated with the waveguide transmission, the normal dispersion of the bulk glass from which the fiber is made. The pulses of light are thereby propagated undistorted since the various frequency components within the light pulse are propagated with an effective velocity which is independent of wavelength in the spectral interval of the pulse.

Inventors

  • 👤 Elias Snitzer

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 05:37
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/02; G02B6/02214; G02B6/036; G02B6/03616; G02B6/03622; G02B6/03627; G02B6/24; G02B6/26; G02B6/28; G02B6/2804; G02B6/2861; G02B6/293; G02B6/29379; G02B6/29392; G02B6/29394; G02B6/42; G02B6/4201; G02B6/4246; H; H04; H04B; H04B10/00; H04B10/25; H04B10/2507; H04B10/2513

Claims Analysis

Total Claims: 11
Claim 1
Independent Claim 101 words
A fiber optic device for use as a light transmission line including a core and cladding, said core having an index of refraction, n1, in relation to the index of refraction, n2, of the cladding at the wavelength of transmission, lambda , and a radius, a, which provides a dispersion in the group velocity for propagation in a given dielectric waveguide mode which is equal in magnitude and opposite in sign to the normal dispersion of the material of which said core is made, said indices of refraction, said radius and said wavelength of transmission being related by the following expression
Claim 2
Dependent Claim 101 words
A fiber optic device for use as a light transmission line including a core and cladding, said core having an index of refraction, n1, in relation to the index of refraction, n2, of the cladding at the wavelength of transmission, lambda , and a radius, a, which provides a dispersion in the group velocity for propagation in a given dielectric waveguide mode which is equal in magnitude and opposite in sign to the normal dispersion of the material of which said core is made, said indices of refraction, said radius and said wavelength of transmission being related by the following expression
Claim 3
Dependent Claim 16 words
The invention according to claim 1 wherein said given mode is the lowest order HE11 mode.
Claim 4
Dependent Claim 33 words
The invention according to claim 2 wherein said cladding includes a constituent absorbing to the light of the transmitted wavelength so that the higher order modes are absorbed more than said HE11 mode.
Claim 5
Dependent Claim 13 words
The invention according to claim 3 wherein said core includes a laserable material.
Claim 6
Dependent Claim 21 words
The invention according to claim 3 wherein said wavelength of transmission is 1.06 microns and said cladding is a samarium-doped glass.
Claim 7
Dependent Claim 13 words
The invention according to claim 5 wherein said core includes a neodyminum-doped glass.
Claim 8
Dependent Claim 37 words
The invention according to claim 3 wherein said wavelength of transmission is 1.06 microns and said cladding is a glass doped with an element chosen from a group consisting of Sm3 , Dy3 , Fe2 Cu2 .
Claim 9
Dependent Claim 34 words
The invention according to claim 1 wherein said core includes a laserable material and said fiber optic device is used as a travelling-wave amplifier for shaping a generated light pulse incident to said device.
Claim 10
Dependent Claim 19 words
The invention according to claim 1 wherein said transmission line is a delay line storage device for a computer.
Claim 11
Dependent Claim 18 words
The invention according to claim 1 wherein said transmission line is for use in a broadband communication system.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-02-28 1975-08-30 1976-02-29 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-02-28 1979-08-30 1980-02-29 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-02-28 1983-08-30 1984-02-29 $7700.00 Window Closed / Lapsed

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