Shanghai Gengyun Industrial Co., Ltd
Photographic fiber preform, special fiber preform technical definition
Photosensitive fiber preform : germanium/rare earth element doped quartz substrate, permanently refractive index modulated by ultraviolet irradiation, used for engraving fiber Bragg gratings (FBGs) .
Special fiber preform: By doping materials (fluorine/boron/photonic crystals) and structural design, it achieves special functions such as energy transmission, radiation resistance, and microstructure.
Four disruptive advantages
Photon customization degree of freedom
The photosensitive preform supports a sensitivity of >40dB and can engrave complex FBG arrays (wavelength accuracy ± 0.05nm), with customized filters/sensors.
Special prefabricated rods achieve a micro porous structure of 0.1-1000 μ m, constructing photonic crystal fibers (PCF) or hollow core fibers .
Extreme environmental adaptability
Radiation resistant prefabricated rod (cerium doped quartz) has a loss of less than 1dB/km under 10 ⁶ Gy gamma rays (ordinary optical fiber failure).
High temperature energy transfer prefabricated rod (pure silicon core+fluorine cladding) can withstand a molten metal environment of 1200 ° C.
Ultra low loss transmission
The ultra pure synthetic quartz process results in a hydroxyl content of less than 1 ppb and an infrared band loss of ≤ 0.15 dB/km (@ 1550nm).
Multi physics field integration capability
Microchannel integrated preform: synchronously transmitting optical signals and fluids, used for on-chip biochemical sensing.
Magnetic doping preform : achieving magnetic optical field coupling in optical fibers (core of magneto-optical isolators).
Revolutionary application scenarios
Breakthrough in core application performance of material types
Photographic preform 5G base station temperature compensation FBG temperature drift<0.5pm/℃ (stable across all frequency bands)
Radiation resistant prefabricated rods Nuclear power plant reactor monitoring fiber optic lifespan>20 years (cumulative dose 100MGy)
Photon crystal preform supercontinuum laser spectrum broadening>2000nm @ 1560nm
Multi material prefabricated rod medical laser surgical knife energy transmission fiber optic transmission 6 μ m mid infrared laser (energy>95%)
Selection Technical Guidelines
Photogenic preform: preferred high germanium doping scheme (photosensitivity>30dB) vs hydrogen loading scheme (poor stability)
Energy transmission scenario: Select pure silicon core+hard polymer coating (NA ≥ 0.22)
Sensing scenario: Select microstructure polarization maintaining prefabricated rod (birefringence>3 × 10 ⁻⁴)
Summary: Two types of prefabricated rods break through the traditional limits of optical fibers with “atomic level material control+three-dimensional structural freedom”, providing underlying optical engines for cutting-edge fields such as quantum communication, fusion devices, and neuroscience. Directly determining the performance ceiling and cost boundary of fiber optic devices.
Keyword：
1.Special fiber preform