NEWS

At the 3rd National Photonic Technology Forum (Guangzhou City, March, 31st to April, 3rd ,2023), Professor Wang Yiping's team (Shenzhen University, Shenzhen Photonic Sensing Technology Co. Ltd.), released for the first time in China, the fully automatic fs-laser direct writing technology and device for fabrication of large-scale fiber grating arrays.

Patented technology first released in China

The advanced technology enables highly efficient and fully automated preparation of large-scale series/parallel integrated fiber grating (including weak reflection point) arrays with length at the km level , for both single-core and multi-core optical fibers. The superiority is listed as followed: direct writing through a layer of coating, no mask, no hydrogen loading, no secondary coating, and spool-to-spool fiber processing. Computer controlled fully automatic grating preparation procedures are listed as followed: fiber movement, clamping, fiber take-in, fiber take-out, fiber core alignment, laser focusing and exposure.

Sample products retain the original tensile strength of the pristine fiber, are resistant to high temperatures, and show excellent long-term stability. Key performance indexes of the sample products are listed as followed: the grating wavelength of the large-scale weak-reflection fiber grating array unveiled onsite is 1550 nm, minimum grating length is<0.5 mm, minimum grating pitch is <0.5 mm, minimum reflectivity is <1 grating="" quantity="" is="">10,000, extinction ratio is 15 dB. Key performance indexes can be customized on demand.

Flexible customization for a wide range of applications

Large-scale fiber grating arrays are highly and broadly demanded in distributed fiber-optic sensing for oil & gas exploration, perimeter security, bridges and dams monitoring, aerospace fields, etc. They play a vital role to improve measurement accuracy, sensing distance, spatial resolution, and other key indexes of technologies such as DAS, DTS and OFDR. It is an important "booster" of distributed fiber-optic sensing technology.

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