TruePhase® 250 µm 1400-1490 nm PM Optical Fibre
- Technology
- Speciality fibre
- Partner
- Lightera (formerly OFS)
This TruePhase® 14XX 250 µm polarisation-maintaining optical fibre is designed for engineers requiring stable polarised light transmission in the 1400–1490 nm band. It preserves the state of polarisation, which is crucial for Raman pump lasers and fibre amplifier systems that demand consistent output power and signal quality. With its dual UV acrylate 250 µm coating and a high proof test rating of 200 kpsi, the fibre offers robust mechanical reliability for deployment in challenging environments.
The short beat length of 3.7–4.7 mm at 1455 nm indicates strong birefringence, helping the fibre maintain polarisation effectively over short and medium lengths. It is well suited to Raman amplification modules, polarisation-sensitive sensors, and advanced telecom equipment. Low attenuation and low polarisation crosstalk support clean signal delivery in demanding photonic systems. Overall, this is a specialist optical fibre that combines strong optical performance with durability for precision applications.
Range features
A high level overview of what this range offers
- Optimised for 1400–1490 nm operation – Designed for efficient use in the target wavelength band for Raman pump and related photonic applications.
- Polarisation-maintaining performance – Preserves the state of polarisation for consistent signal quality in polarisation-sensitive systems.
- Strong Raman amplification suitability – Supports stable pump delivery and dependable gain behaviour in Raman amplifier assemblies.
- 250 µm dual UV acrylate coating – Provides mechanical protection and compatibility with standard fibre handling and integration processes.
- High proof test rating – Tested to ≥ 200 kpsi (≈ 1.38 GPa) for strong mechanical reliability.
- Low attenuation – Specified at ≤ 1.2 dB/km at 1455 nm to minimise optical loss.
- Short beat length – 3.7–4.7 mm at 1455 nm indicates strong birefringence and excellent polarisation retention.
- Low polarisation crosstalk – ≤ –30 dB per 100 m helps maintain high polarisation purity.
- Wide operating temperature range – Suitable for use from –40 °C to +85 °C.
- Customisation options available – Can be supplied with alternative coatings, cable formats, metalisation, and other tailored options.
Downloads
for TruePhase® 250 µm 1400-1490 nm PM Optical Fibre
TruePhase 14XX 250 µm Polarisation-Maintaining Optical Fibre – Datasheet
DownloadWhat’s in this range?
All the variants in the range and a comparison of what they offer
Specification | Value |
Coating Material | Dual UV acrylate |
Cladding Diameter | 125 ± 1.0 µm |
Coating/Buffer Diameter | 250 ± 10 µm |
Cladding Non-Circularity | ≤ 2.0 % |
Core/Cladding Offset | ≤ 0.5 µm |
Fibre Type | Polarisation-maintaining (PM) |
Operating Wavelength | 1400 – 1490 nm |
Cutoff Wavelength | ≤ 1390 nm |
Mode Field Diameter @ 1455 nm | 9.8 ± 0.5 µm |
Attenuation @ 1455 nm | ≤ 1.2 dB/km |
Beat Length @ 1455 nm | 3.7 – 4.7 mm |
Polarisation Crosstalk @ 1550 nm (100 m) | ≤ –30 dB |
Polarisation Crosstalk (Typical) @ 1550 nm (100 m) | ≤ –35 dB |
Numerical Aperture (Nominal) | 0.13 |
Operating Temperature | –40 °C to +85 °C |
Proof Test Level | ≥ 200 kpsi (≈ 1.38 GPa) |
Part Number | BF06832-06 |
Available Options | Cabling; coating material and dimensions; metalisation; optical property tweaks; alternate proof test |
FAQs
for TruePhase® 250 µm 1400-1490 nm PM Optical Fibre
This fibre is primarily used in Raman amplifier systems and Raman pump laser pigtails where stable polarisation is essential. It also suits other photonic applications in the 1400–1490 nm range, including specialised optical communication links, sensors, interferometric systems, and setups with polarisation-dependent components.
In Raman amplification, the pump light’s polarisation state affects gain efficiency and stability. A polarisation-maintaining fibre keeps the pump aligned along a defined axis, helping deliver more consistent gain, more stable output power, and reduced performance variation compared with standard fibre.
A short beat length indicates strong birefringence, which is a key sign of good polarisation-maintaining behaviour. In practical terms, it means the fibre is highly effective at preserving the launched polarisation state, making it suitable for precision optical systems.
The specified attenuation is ≤ 1.2 dB/km at 1455 nm. This low loss helps maximise transmitted optical power, which is especially valuable in Raman pump delivery, amplifier modules, and other systems where efficiency and signal quality are important.
This specification indicates very little optical power couples from one polarisation axis to the other over distance. In use, that means the fibre maintains high polarisation purity, which is critical for interferometry, extinction-sensitive components, and other polarisation-dependent applications.
A 200 kpsi proof test shows that the fibre has been mechanically stress-tested to a high level, giving confidence in its robustness during handling, installation, connectorisation, and long-term deployment. It is an important indicator of mechanical reliability.
Yes. This fibre is available with alternative coating materials, different dimensions, cabling options, metalisation, and other tailored changes on request. That flexibility allows it to be adapted for specialised environments or integration requirements.
The standard operating temperature range is –40 °C to +85 °C, which is suitable for many telecom, industrial, and outdoor applications. If a more demanding environment is involved, customised coating or construction options may be considered.
It can be fusion-spliced and connectorised using standard fibre-optic processes, but PM fibre requires careful axis alignment during assembly. Correctly aligning the fibre’s polarisation axes helps preserve its polarisation-maintaining performance across the connection.
