# US 9,519,101 B2 · Few moded optical fiber and system incorporating such

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- Number: US 9,519,101 B2
- Document ID: US9519101B2
- Status: Granted
- Kind: B2
- Application number: 14/689,538
- Filed: 2015-04-17
- Published: 2015-10-29
- Granted: 2016-12-13
- Earliest claimed: 2014-04-29
- Assignees: Corning Incorporated
- Applicants: Corning Incorporated
- Inventors: Scott Robertson Bickham; Dana Craig Bookbinder; Ming Jun Li; Pushkar Tandon
- Web page: https://patentgrep.com/patent/US9519101B2

## CPC

- G02B 6/0288: {Multimode fibre, e.g. graded index core for compensating modal dispersion}
- G02B 6/02395: {Glass optical fibre with a protective coating, e.g. two layer polymer coating deposited directly on a silica cladding surface during fibre manufacture (G02B6/02052, G02B6/02057, G02B6/024, G02B6/032, G02B6/105, G02B6/14 take precedence; coating on fibre gratings G02B6/02104; multilayer core or cladding G02B6/036; reinforcing splice joints G02B6/2558; optical cables, i.e. comprising protective structures external to the protective coating such as a jacket or plural coated optical fibres G02B6/44; coating of glass to obtain optical fibres C03C25/104)}
- G02B 6/03627: {arranged - +}
- G02B 6/42: Coupling light guides with opto-electronic elements
- H04B 10/2581: Multimode transmission
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H04B: TRANSMISSION

## Abstract

One embodiment of the disclosure relates to a few moded optical fiber comprises: a glass graded index core having alpha profile such that 2.0≦α≦2.15, a diameter D1 in the range of 13 microns to 40 microns, a maximum relative refractive index between 0.265 and 0.65 percent, core being structured to propagate more with X number of mode groups at a wavelength of 850 nm, wherein X is an integer greater than 1 and less than 8; and (b) a cladding including a depressed-index annular region surrounding the inner cladding. The fiber has an overfilled bandwidth greater than 2.0 GHz-km at 850 nm and relative microbending sensitivity γ such that γ≦1.5.

## Claims

### Claim 1

A few moded optical fiber comprising:
a glass graded index core having alpha profile such that 2.0≦α≦2.15, a diameter D1, such that 12.5 microns ≦D1<40 microns, a maximum relative refractive index between 0.265 and 0.65 percent, the glass core diameter D1 and refractive index are selected such that the core is capable of supporting the propagation and transmission of an optical signal with X number of mode groups at a wavelength of 850 nm, wherein X is an integer greater than 1 and less than 8; and
a cladding comprising a depressed-index annular region surrounding the core, said depressed-index annular region having a relative refractive index delta of less than −0.1% and a width of at least 1 micron,
wherein the fiber has an overfilled bandwidth greater than 2.5 GHz-km at 850 nm and relative microbending sensitivity γ such that γ≦1.5.

### Claim 2 (depends on 1)

The few moded optical fiber according to claim 1, wherein said depressed-index annular region having a relative refractive index of less than −0.2% and said cladding further comprises an inner cladding regioin surrounding and in contact with the core, wherein cladding further comprises an inner cladding and the width of said inner cladding is at least 0.5 microns and less than 4 microns and said depressed-index annular region surrounds the inner cladding.

### Claim 3 (depends on 1)

The few moded optical fiber according to claim 1, wherein said relative maximum refractive index of said core is less than 0.6 percent.

### Claim 4 (depends on 1)

The few moded fiber of claim 1, wherein said fiber exhibits an overfilled bandwidth at a wavelength situated in 840 nm to 860 nm range which is greater than 4 GHz-km.

### Claim 5 (depends on 1)

The few moded fiber of claim 1, wherein said fiber exhibits an overfilled bandwidth at a wavelength situated in 840 nm to 860 nm range which is greater than 10 GHz-km.

### Claim 6 (depends on 1)

The few moded fiber of claim 1, wherein said fiber exhibits an overfilled bandwidth at a wavelength situated in 840 nm to 860 nm wavelength range which is greater than 20 GHz-km.

### Claim 7 (depends on 1)

The few moded fiber of claim 1, wherein said fiber exhibits an overfilled bandwidth at a wavelength situated in 840 nm to 860 nm range which is greater than 50 GHz-km.

### Claim 8 (depends on 1)

The few moded fiber of claim 1, wherein said core comprises a diameter D1 between 16 and 36 microns.

### Claim 9 (depends on 1)

The few moded fiber of claim 1, wherein said core comprises diameter D1 between 12.5 and 25 microns.