Features
● Low attenuation at DTS operating wavelength 1450nm, 1550nm and 1650 nm
● High bandwidth at C-band (especially at 1550nm)
● High temperature resistance
● Low splicing loss
● Excellent bending insensitivity
Specifications
Specifications of Polarization Maintaining Fibre for Fibre Coil
Fibre Type | GI62.5/125-27/250DTS | GI50/125-20/250DTS |
Part No. | IDP-DTS-MM625 | IDP-DTSMM500 |
Optical Properties |
Numerical Aperture (NA) | 0.275±0.02 | 0.195±0.02 |
Loss | @1300nm（dB/km) | ≤0.6 | ≤0.5 |
@1450 nm（dB/km) | ≤0.5 | ≤0.45 |
@1550 nm（dB/km) | ≤0.4 | ≤0.28 |
@1650 nm（dB/km) | ≤0.5 | ≤0.45 |
Splicing Loss (dB) | ≤0.1 | ≤0.1 |
Bandwidth | @1300 nm（MHz·km) | ≥200 | ≥200 |
@1550 nm（MHz·km) | ≥1000 | ≥1000 |
Geometrical Properties |
Fibre Core Radium (μm) | 62.5±1.5 | 50±1.5 |
Cladding Diameter(μm) | 125±0.7 | 125±0.7 |
Fibre Diameter (μm) | 245±7 | 245±7 |
Concentricity of Core Cladding (μm) | ≤1.5 | ≤1.5 |
Non-circularity of Core (%) | ≤5.0 | ≤5.0 |
Non-circularity of Cladding (%) | ≤0.6 | ≤0.6 |
Mechanical Properties |
Proof Test Level (kpsi) | ≥100 | ≥100 |
Environmental Properties |
Operating Temperature Range（℃) | -40~+85/-40~+150(Optional) | -40~+85/-40~+150(Optional) |
Compared with communication multimode fibre, the advantages of DTS-MMF are as follows:
1.Low attenuation at DTS operating wavelength
The lower attenuation of the DTS-MMF at the wavelength of 1450nm, 1550nm and 1650nm can increase the distance of the distributed temperature measurement system.
2.High bandwidth at 1550nm
According to IEC 60793-1-41-2010 (bandwidth), the actual measured bandwidth at 1550nm of DTS-MMF can exceed more than 1000MHz·km, which effectively improves the spatial resolution of the long-distance distributed temperature measurement system.
