초록 ▼

An optical fiber comprising: (i) a core having a refractive index profile; (ii) an annular cladding surrounding the core; (iii) a primary coating contacting and surrounding the cladding, the primary coating having an in situ modulus of less than 0.35 MPa and an in situ glass transition temperature o

An optical fiber comprising: (i) a core having a refractive index profile; (ii) an annular cladding surrounding the core; (iii) a primary coating contacting and surrounding the cladding, the primary coating having an in situ modulus of less than 0.35 MPa and an in situ glass transition temperature of less than −35° C.; and (iv) a secondary coating surrounding the primary coating, the secondary coating having an in situ modulus of greater than 1200 MPa; wherein the refractive index profile of said core is constructed to provide an LP11 theoretical cutoff wavelength greater than 2.0 μm and an effective area greater than 110 microns2 at 1550 nm.

대표청구항 ▼

1. An optical fiber comprising: a core having a refractive index profile;an annular cladding surrounding the core;a primary coating contacting and surrounding the cladding, the primary coating having an in situ modulus of less than 0.35 MPa and an in situ glass transition temperature of less than −3

1. An optical fiber comprising: a core having a refractive index profile;an annular cladding surrounding the core;a primary coating contacting and surrounding the cladding, the primary coating having an in situ modulus of less than 0.35 MPa and an in situ glass transition temperature of less than −35° C.;a secondary coating surrounding the primary coating, the secondary coating having an in situ modulus of greater than 1200 MPa;wherein the refractive index profile of said core is constructed to provide a theoretical cutoff wavelength of an LP11 mode greater than about 2.0 μm and an LP01 effective area greater than 110 μm2 at 1550 nm. 2. The optical fiber according to claim 1, wherein said fiber comprises a step refractive index profile, wherein said core is a glass core, and said cladding is a glass cladding; said core comprises: a radius rc from about 6 μm to about 15 μm;a maximum relative refractive index Δ1MAX from about 0.2% to about 0.55% relative to the glass cladding;an LP01 effective area greater than about 110 μm2 and less than about 210 μm2, a theoretical cutoff wavelength of the LP02 mode is less than about 1800 nm; andsaid glass cladding comprises a maximum relative refractive index Δ4MAX such that Δ1MAX>Δ4MAX. 3. The optical fiber according to claim 2, wherein the MPI is less than −30 dB at a wavelength of 1550 nm. 4. The optical fiber according to claim 3, wherein the MPI is less than −35 dB at a wavelength of 1550 nm. 5. The optical fiber according to claim 2, wherein the differential delay between the LP01 and LP11 modes is less than about 0.5 ns/km at a wavelength of 1550 nm. 6. The optical fiber according to claim 2, wherein a theoretical cutoff of an LP11 mode is greater than 2.15 μm and the MPI is less than −30 dB at a wavelength of 1550 nm. 7. The optical fiber of claim 2, wherein said optical fiber has an LP01 attenuation of Δ4MAX. 12. The optical fiber of claim 11, wherein the MPI is less than −30 dB at a wavelength of 1550 nm. 13. The optical fiber of claim 11, wherein the MPI is less than −35 dB at a wavelength of 1550 nm. 14. The optical fiber according to claim 11, wherein the differential delay between the LP01 and LP11 modes is less than about 0.5 ns/km at a wavelength of 1550 nm. 15. The optical fiber according to claim 11, wherein a theoretical cutoff of an LP11 mode is greater than 2.15 μm and the MPI is less than −30 dB at a wavelength of 1550 nm. 16. The optical fiber of claim 11, wherein said optical fiber has an LP01 attenuation of <0.22 dB/km. 17. The optical fiber of claim 11, wherein said optical fiber has an LP11 attenuation of <0.25 dB/km. 18. The optical fiber according to claim 11, wherein said fiber core has an alpha value greater than 2.3 and less than about 2.7 at a wavelength of 1550 nm. 19. A mode division multiplexing (MDM) optical transmission system, comprising: a transmitter configured to transmit first and second guided-wave optical signals respectively having a first and a second wavelength in an LP11 and an LP01 mode, respectively;a receiver configured to receive and wavelength demultiplex the first and second optical signals; andthe few mode optical fiber of claim 11 configured to optically connect the transmitter and the receiver and support the transmission of the first and second guided-wave optical signals.