P-SM-5, P-SM-7, P-SM-8 series are specially designed for highly efficient Raman lasers and amplifiers operating in the 1.1-1.6 µm spectral range. The main advantage of phosphorus-doped fiber is a three times higher value of the Raman shift as compared to germanium-doped fibers. This feature allows one to strongly simplify the Raman fiber laser and amplifier design. For example, to construct a high-power laser @ 1480nm required for pumping Er-doped fibers, only two cascades of Raman wavelength transformation are necessary, whereas six cascades are necessary in the case of Ge-doped fibers.
Fiber specifications
Model
|
P-SM-5
|
P-SM-7
|
P-SM-8
|
Core diameter, µm
|
5.0 ± 0.5
|
5.0 ± 0.6
|
5.5 ± 0.5
|
Clad diameter, µm
|
125 ± 1
|
125 ± 1
|
125 ± 1
|
Core NA
|
0.18
|
0.18
|
0.18
|
MFD @ 1550nm, µm
|
4.0 ± 0.5
|
4.0 ± 0.5
|
4.0 ± 0.5
|
Cutoff wavelength, µm
|
0,95 ÷ 1,05
|
0,9 ÷ 1,25
|
0,9 ÷ 1,25
|
Optical loss (1064 nm), dB/km
|
< 2.0
|
< 2.9
|
< 2.1
|
Optical loss (1240 nm), dB/km
|
< 1.2
|
< 1.95
|
< 1.1
|
Optical loss (1480 nm), dB/km
|
< 1.0
|
< 1.45
|
< 1.0
|
Raman gain, dB/km×W
|
> 5.8
|
> 6
|
< 5
|
Nonconcentricity, µm
|
< 1
|
< 1
|
< 1
|
Other parameters including PM version are available on the request
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