Compared to the phase mask method, what are the advantages of this technique for customizing long-length gratings?
Compared to the phase mask method, the point-by-point inscription technique, particularly using femtosecond lasers, offers several key advantages for customizing long-length gratings:
- Preservation of Fiber Strength: The femtosecond laser point-by-point inscription method allows for grating fabrication without stripping the optical fiber’s protective coating. This significantly preserves the inherent mechanical strength of the fiber, which is crucial for long-length gratings that might experience more handling or stress during installation and operation. In contrast, the phase mask method typically requires stripping the coating, which can compromise fiber strength.
- Flexibility in Grating Design: This method provides superior flexibility in defining the grating parameters along its length. It allows for the inscription of gratings with arbitrary profiles, including chirped gratings, apodized gratings, and gratings with multiple discrete sensing points along an extended section. This level of control is more challenging to achieve with a single phase mask.
- Inscription in Various Fiber Types and Cables: Point-by-point inscription is highly adaptable and can be performed in a wider range of optical fiber types, including specialty fibers, and even directly within pre-existing optical fiber cables, without requiring hydrogen loading.
OFSCN® utilizes this advanced technique in products such as our OFSCN® Standard Femtosecond Fiber Bragg Gratings / Fiber Bragg Grating Strings (Bare) and OFSCN® High-Strength Fiber Bragg Gratings / Fiber Bragg Grating Strings (Bare), as well as OFSCN® Chirped Fiber Bragg Grating (Bare).
Here is an example of an OFSCN® Femtosecond Fiber Bragg Grating:
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