Large Core Optical Fibers (Bundles)
Optical Large Core Fibers
Descriptions
We supply two types of optical fibers, SI (Step Index) and GI (Graded Index) type. SI type fiber uses pure silica core and GI type fiber uses germanium doped core.
The Diaguide ST series of silica fibers manufactured by the modified Rod-in-Tube method feature a high-purity core/clad rating and are available in a wide range of sizes. Our pure silica core fibers feature high light transmission efficiency and is suitable for a wide range of applications, such as cutting, engraving, and plating.

Standard Specifications
Type
Core Material
N.A.
Attenuation (l=1.06µm)
SI
SiO2
0.2±0.02

5dB/km max.
GI
GeO2, SiO2
0.25±0.02
3dB/km max.

SI Type Optical Fiber

Type
Core Dia. (µm)
Fiber Dia. (µm)
Primary Coating Dia. (silicon) (mm)
Secondary Coating Dia. (polyamide) (mm)
Allowable Bending Radius (mm)
Jacket Color
ST100E-SY
100
500
0.78
1.3
100
Green
ST200E-SY
200
ST300E-SY
300
ST400E-SY
400
ST600E-SY
750
750
1.10
1.7
150
ST800G-SY
800
1000
1.32
2.0
200
ST1000H-SY
1000
1250
1.73
2.3
250
ST1200I-SY
1200
1500
1.90
2.3
300

SI Type Optical Fiber
Type
Core Dia. (µm)
Fiber Dia. (µm)
Primary Coating Dia. (silicon) (mm)
Secondary Coating Dia. (polyamide) (mm)
Allowable Bending Radius (mm)
Jacket Color
SGLH100E-SY
100
500
0.78
1.3
100
Violet
SGLH200E-SY
200
SGLH300E-SY
300
SGLH400E-SY
400
SGLH600E-SY
750
750
1.10
1.7
150
SGLH800G-SY
800
1000
1.32
2.0
200
SGLH1000H-SY
1000
1250
1.73
2.3
250
SGLH1200I-SY
1200
1500
1.90
2.3
300

Typical Spectral Loss Characteristics

Typical Spectral Loss Characteristics