Phosphorus doped fiber PDF-5/125

Single-mode Raman gain fiber for 1.1–1.6 µm lasers and amplifiers —
3× the Raman shift of germanium-doped fiber.

PDF-5/125 is a phosphorus-doped single-mode fiber engineered for highly efficient Raman lasers and amplifiers across the 1.1–1.6 µm band. Its phosphorus-doped core produces a Raman shift roughly three times larger than standard germanium-doped fiber, letting designers reach the same target wavelength with far fewer Raman conversion cascades.

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.

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Key Advantages

3× higher Raman shift than Ge-doped fiber — dramatically simplifies cascaded Raman laser/amplifier design.
Fewer conversion stages — e.g. a 1480 nm pump for Er-doped fiber pumping needs only 2 cascades with PDF-5/125, versus 6 with Ge-doped fiber.
Broad operating range — efficient Raman gain across 1.1–1.6 µm.
Two quality grades — PDF-5/125-P and PDF-5/125-A, selectable by fiber quality parameter (Pf) to match budget/performance needs.
Low optical loss — as low as < 1.2 dB/km at 1310 nm (P-grade).
Standard single-mode geometry — 125 µm cladding for straightforward integration with existing fiber laser platforms.

Why it matters: every extra Raman conversion cascade adds cost, complexity, and loss to a fiber laser system. By tripling the Raman shift per stage, PDF-5/125 turns a 6-cascade design problem into a 2-cascade one for common target wavelengths like 1480 nm — fewer splices, fewer gratings, higher net efficiency.

Applications

Pump sources for Er-doped fiber amplifiers (e.g., 1480 nm generation)

Raman fiber lasers and amplifiers, 1.1–1.6 µm

Cascaded Raman wavelength converters

Spectroscopy and metrology light sources requiring specific Raman-shifted wavelengths

Telecom and industrial Raman amplification

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Need a Raman fiber matched to your target
wavelength and cascade count?

Contact our engineering team!