Coated low loss optical fiber with small diameter

A multimode optical fiber comprising:

• a core region, said core region having an outer radius r1 in the range from 10 μm to 20 μm, and a relative refractive index profile defined by the relationship:
• Δ
• 1
• 
• (
• r
• )
• =
• Δ
• 1
• 
• 
• max
• 
• [
• 1
• -
• [
• r
• r
• 1
• ]
• α
• ]
• and
• a cladding, said cladding having an outer radius r4 in the range from 35 μm to 60 μm and a relative refractive index Δ4 in the range from −0.1% to 0.1%;
• and
• a coating surrounding said cladding, said coating having an outer radius r5 less than 100 μm and a thickness less than 55 μm;
• wherein said core region and said cladding form a waveguide that supports a fundamental mode and at least one higher order mode at 1310 nm and said multimode optical fiber has an effective modal bandwidth at 850 nm of at least 1.5 GHz-km and a numerical aperture greater than 0.22.

A multimode optical fiber comprising:

• a core region, said core region having an outer radius r1 in the range from 18 μm to 22 μm, and a relative refractive index profile defined by the relationship:
• Δ
• 1
• 
• (
• r
• )
• =
• Δ
• 1
• 
• 
• max
• 
• [
• 1
• -
• [
• r
• r
• 1
• ]
• α
• ]
• and
• a cladding, said cladding having an outer radius r4 in the range from 35 μm to 60 μm and a relative refractive index Δ4 in the range from −0.1% to 0.1%;
• and
• a coating surrounding said cladding, said coating having an outer radius r5 less than 100 μm and a thickness less than 55 μm;
• wherein said core region and said cladding form a waveguide that supports a fundamental mode and at least one higher order mode at 1310 nm and said multimode optical fiber has an effective modal bandwidth at 1310 nm of at least 1.5 GHz-km and a numerical aperture in the range from 0.18 to 0.24.

A multimode optical fiber comprising:

• a core region, said core region having an outer radius r1 in the range from 18 μm to 22 μm, and a relative refractive index profile defined by the relationship:
• Δ
• 1
• 
• (
• r
• )
• =
• Δ
• 1
• 
• 
• max
• 
• [
• 1
• -
• [
• r
• r
• 1
• ]
• α
• ]
• and
• a cladding, said cladding having an outer radius r4 in the range from 35 μm to 60 μm and a relative refractive index Δ4 in the range from −0.1% to 0.1%;
• and
• a coating surrounding said cladding, said coating having an outer radius r5 less than 100 μm and a thickness less than 55 μm;
• wherein said core region and said cladding form a waveguide that supports a fundamental mode and at least one higher order mode at 1310 nm and said multimode optical fiber has an effective modal bandwidth at 850 nm of at least 1.5 GHz-km and a numerical aperture in the range from 0.18 to 0.24.

An optical data link comprising:

• a transmitter, said transmitter including a light source, said light source providing light;
• and
• a first multimode optical fiber operably connected to said transmitter, said first multimode optical fiber receiving said light from said light source, said first multimode optical fiber comprising:
• a core region, said core region having an outer radius r1 in the range from 18 μm to 22 μm, and a relative refractive index profile defined by the relationship:
• Δ
• 1
• 
• (
• r
• )
• =
• Δ
• 1
• 
• 
• max
• 
• [
• 1
• -
• [
• r
• r
• 1
• ]
• α
• ]
• and
• a cladding, said cladding having an outer radius r4 in the range from 35 μm to 60 μm and a relative refractive index Δ4 in the range from −0.1% to 0.1%;
• and
• a coating surrounding said cladding, said coating having an outer radius r5 less than 100 μm and a thickness less than 55 μm;
• wherein said core region and said cladding form a waveguide that supports a fundamental mode and at least one higher order mode at 1310 nm and said first multimode optical fiber has an effective modal bandwidth at 1310 nm of at least 1.5 GHz-km and a numerical aperture in the range from 0.18 to 0.24.

An optical data link comprising:

• a transmitter, said transmitter including a light source, said light source providing light;
• and
• a first multimode optical fiber operably connected to said transmitter, said first multimode optical fiber receiving said light from said light source, said first multimode optical fiber comprising:
• a core region, said core region having an outer radius r1 in the range from 18 μm to 22 μm, and a relative refractive index profile defined by the relationship:
• Δ
• 1
• 
• (
• r
• )
• =
• Δ
• 1
• 
• 
• max
• 
• [
• 1
• -
• [
• r
• r
• 1
• ]
• α
• ]
• and
• a cladding, said cladding having an outer radius r4 in the range from 35 μm to 60 μm and a relative refractive index Δ4 in the range from −0.1% to 0.1%;
• and
• a coating surrounding said cladding, said coating having an outer radius r5 less than 100 μm and a thickness less than 55 μm;
• wherein said core region and said cladding form a waveguide that supports a fundamental mode and at least one higher order mode at 1310 nm and said first multimode optical fiber has an effective modal bandwidth at 850 nm of at least 1.5 GHz-km and a numerical aperture in the range from 0.18 to 0.24.

An optical data link comprising:

• a transmitter, said transmitter including a light source, said light source providing light;
• and
• a first multimode optical fiber operably connected to said transmitter, said first multimode optical fiber receiving said light from said light source, said first multimode optical fiber comprising:
• a core region, said core region having an outer radius r1 in the range from 18 μm to 22 μm, and a relative refractive index profile defined by the relationship:
• Δ
• 1
• 
• (
• r
• )
• =
• Δ
• 1
• 
• 
• max
• 
• [
• 1
• -
• [
• r
• r
• 1
• ]
• α
• ]
• and
• a cladding, said cladding having an outer radius r4 in the range from 35 μm to 60 μm and a relative refractive index Δ4 in the range from-0.1% to 0.1%;
• and
• a coating surrounding said cladding, said coating having an outer radius r5 less than 100 μm and a thickness less than 55 μm;
• wherein said core region and said cladding form a waveguide that supports a fundamental mode and at least one higher order mode at 1310 nm and said first multimode optical fiber has an effective modal bandwidth at 1064 nm of at least 1.5 GHz-km and a numerical aperture in the range from 0.18 to 0.24.