Phosphorus doped fiber
PDF-5/125PM
Phosphorus doped fiber PDF-5/125PM
PANDA-type PM Raman gain fiber for polarization-sensitive Raman lasers and amplifiers.
Description
Datasheet
Polarization maintenance phosphorus doped fiber Article PDF-5/125PM
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PDF-5/125PM is the polarization-maintaining version of FORC-Photonics' phosphorus-doped Raman fiber, built on a PANDA stress-rod design. It combines the large Raman shift of phosphorus doping with a high polarization extinction ratio, for Raman laser and amplifier designs that need to preserve a defined polarization state.
Customization — Two fiber quality grades (P/A) available; other parameters are available on the request. A polarization-maintaining version is available — see PDF-5/125PM.
Key Advantages
- High polarization extinction ratio — > 20 dB after just 30 m of fiber.
- PANDA design — a proven, mechanically robust PM geometry.
- Strong Raman gain — > 5 dB/(km·W), consistent with the standard PDF-5/125 series.
- Low loss across key Raman bands — < 3 dB/km at 1064 nm, < 2 dB/km at 1310 nm.
- Low optical loss — as low as < 1.2 dB/km at 1310 nm (P-grade). Tight core geometry control — non-concentricity < 1 µm.
- Drop-in compatibility — same 5/125 µm core/clad dimensions as the standard (non-PM) PDF-5/125 series.
Why it matters: standard Raman fibers scramble polarization over distance, which is a problem for coherent combining, polarization-sensitive Raman amplification, and single-frequency systems. PDF-5/125PM keeps the phosphorus-doped fiber's Raman-shift advantage while adding PANDA-grade polarization control — so designers don't have to trade one for the other.
Applications
Polarization-sensitive Raman lasers and amplifiers
Single-frequency Raman-shifted sources
Coherent-combining fiber laser architectures
Polarization-maintaining pump sources for Er-doped fiber amplifiers
fiber sensing systems requiring a defined polarization state
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