Frequently Asked Questions

Phosphorus-doped fiber has roughly three times the Raman shift of germanium-doped fiber, so reaching a target wavelength needs far fewer conversion cascades — for example, 2 cascades instead of 6 to generate a 1480 nm pump for Er-doped fiber amplifiers.

The two grades differ in fiber quality parameter (Pf < 1 for the P-grade, Pf > 1 for the A-grade) and correspondingly in Raman gain and optical-loss specifications — the P-grade offers tighter loss and slightly higher Raman gain.

PDF-5/125 is designed for Raman lasers and amplifiers operating across the 1.1–1.6 µm spectral range.

Yes — see PDF-5/125PM, the PANDA-type polarization-maintaining version of this fiber.