IXFiber Photosensitive Single-Mode Optical Fiber

Overview

The IXFiber Photosensitive Single-Mode Optical Fiber is a precision-engineered specialty fiber designed explicitly for the reliable and reproducible inscription of high-performance Fiber Bragg Gratings (FBGs). Based on modified germanosilicate core composition and optimized dopant profiles, this fiber exhibits controlled, uniform photosensitivity to ultraviolet (UV) radiation—particularly at 244 nm (KrF excimer) and 193 nm (ArF excimer) wavelengths—enabling stable grating formation without requiring prolonged hydrogen loading or aggressive sensitization protocols. Its proprietary waveguide design suppresses cladding mode coupling (CMC), minimizing insertion loss and spectral distortion in reflection-based FBG devices. The fiber maintains full compatibility with standard single-mode telecom infrastructure (ITU-T G.652.D compliant), while offering enhanced thermal stability post-inscription—critical for laser cavity integration, strain/temperature sensing, and wavelength-stabilized pump combiners.

Key Features

• Engineered UV photosensitivity: Uniform, batch-to-batch reproducible response across 193–248 nm spectral range; available in multiple sensitivity grades (low-, medium-, and high-photosensitivity variants)
• Cladding mode suppression architecture: Reduced cladding mode coupling ensures >45 dB side-lobe suppression and minimal resonance splitting in FBG reflection spectra
• Hydrogen-loading compatible: Supports both pre- and post-load sensitization; retains grating strength after annealing up to 300 °C for >1000 hours
• Dual-clad configuration option: Enables high-power FBG integration in fiber laser resonators (e.g., Yb-doped or Er/Yb co-doped cavities) with efficient pump light confinement
• Low polarization mode dispersion (PMD): <0.05 ps/√km, suitable for coherent sensing and interferometric applications
• Hermetic carbon coating option: Improves mechanical reliability and long-term environmental stability under humidity and thermal cycling (IEC 61300-2-4, -2-22 compliant)

Sample Compatibility & Compliance

This fiber is fully compatible with standard fusion splicing platforms (e.g., Vytran GPX-3400, Fujikura CT-50), UV phase mask systems (e.g., Ibsen Photonics, Point Source), and scanning-beam FBG inscription setups. It meets IEC 60793-2-50 Category A1a specifications for single-mode fibers and conforms to ITU-T G.652.D geometric and transmission requirements. For regulated environments—including medical laser systems and aerospace-grade sensing—fiber batches are supplied with full traceability documentation, including refractive index profile maps, cutoff wavelength verification reports, and accelerated aging test summaries. Optional GLP-compliant manufacturing records (per ISO/IEC 17025) are available upon request for qualification in FDA 21 CFR Part 11–governed instrumentation.

Software & Data Management

While the fiber itself is a passive component, its performance is validated using industry-standard optical characterization tools: OFDR-based distributed strain/temperature analyzers (e.g., Luna ODiSI), tunable laser reflectometry (TLR) systems (e.g., EXFO FTB-5500B), and spectral analysis software supporting ITU-T G.694.1 grid alignment. IXFiber provides digital calibration datasets for common FBG interrogation algorithms—including transfer matrix method (TMM) and coupled-mode theory (CMT) modeling—enabling accurate simulation of grating apodization, chirp, and thermal drift compensation. Raw spectral data exports support CSV, S1P, and HDF5 formats for integration into MATLAB, Python (SciPy), or LabVIEW-based QA/QC workflows.

Applications

• Fiber laser cavity mirrors and wavelength-selective feedback elements (e.g., narrow-linewidth Yb-fiber oscillators)
• Embedded quasi-distributed strain and temperature sensors in composite structures (wind turbine blades, aircraft fuselages)
• High-precision optical filters for DWDM channel monitoring and gain flattening
• Reference gratings in optical time-domain reflectometry (OTDR) calibration standards
• Stabilized seed sources for MOPA amplifier chains in industrial cutting and welding systems
• Biomedical sensing platforms requiring low-birefringence, low-drift FBGs (e.g., intravascular pressure catheters)

FAQ

Is hydrogen loading mandatory for grating inscription?
No—while hydrogen loading enhances photosensitivity and enables lower UV fluence, IXFiber’s standard photosensitive fiber achieves robust FBG formation without it. Loading is recommended only for ultra-low-fluence or high-thermal-stability applications.
What is the typical Bragg wavelength shift vs. temperature coefficient?
The packaged fiber exhibits a thermo-optic coefficient of +6.5 pm/°C near 1550 nm, consistent with standard SMF-28; hermetic coating reduces hysteresis to <±0.5 pm over 50 °C thermal cycles.
Can this fiber be spliced to standard SMF-28 with low loss?
Yes—mode field diameter mismatch is <0.3 µm; average splice loss is ≤0.03 dB using optimized arc parameters and core alignment.
Are custom lengths and jacketing options available?
Yes—standard delivery includes 250 µm acrylate, 400 µm tight buffer, or 900 µm loose tube configurations; custom lengths from 1 m to 5 km are supported with reel-based certification.
Does IXFiber provide FBG inscription services?
IXFiber supplies fiber only; however, certified third-party inscription partners (listed in the IXFiber Partner Network) offer turnkey FBG fabrication with full metrology reporting and ISO 17025 traceability.