Mojinano—Femtosecond Direct-Writing Equipment for Fiber Grating Fabrication MJ-Works-FBG

Center Wavelength Range [Tolerance :±0.3]: 1030~1080 nm Reflectance [Tolerance :±5%]: 0.5%~99.9% Bandwidth (FWHM) [Tolerance :±0.05]: 0.1~1.5 nm

Double-clad fiber gratings are inscribed in passive double-clad fiber. In fiber lasers using cladding-mode pumping, energy carried by cladding modes greatly increases pump power and efficiency. High-power lasers commonly use doped double-clad gain fiber and fiber gratings as cavity mirrors. Gratings with matching parameters couple efficiently to the doped fiber and have an indispensable role in high-power fiber lasers.

Center Wavelength Range [Tolerance :±0.3]: 970~980 nm Center Wavelength Range [Tolerance :±0.3]: 1060~1066 nm Center Wavelength Range [Tolerance :±0.3]: 1310 nm

Uniform fiber gratings have side peaks around their main reflection peak, called grating side modes. These degrade channel isolation in devices requiring strong side-mode suppression, such as dense wavelength-division multiplexers. Modulating the refractive-index modulation amplitude with a specified function suppresses the side modes, producing an apodized fiber grating. Through sustained research and testing, our team developed a mature amplitude-mask process that achieves strong side-mode suppression with high reflectivity and narrow bandwidth.

Center Wavelength Range [Tolerance :±0.3]: 1625 nm Center Wavelength Range [Tolerance :±0.3]: 1650 nm Reflectance [Tolerance :±5%]: 0.5%~99.9%

Chirped fiber gratings have an axial period that varies rather than remaining constant. Different periods correspond to different Bragg reflection wavelengths, so incident wavelengths reflect at different positions and acquire different optical path lengths. This enables effective dispersion compensation for different signals in long-distance fiber communications. Uniform fiber gratings have relatively narrow bandwidths; wider bandwidths require chirped gratings.

Center Wavelength [Contact us for other wavelengths.]: 1010 to 2110nm Reflectance: 3% (OC) ~ 99.9% (HR) FWHM Bandwidth: 0.2 ~ 4nm

In fiber lasers, double-clad fiber is the waveguide medium. Its very small core confines few laser modes, readily producing high power density. With cladding-mode pumping, the inner cladding supports high-power semiconductor pumping for increased efficiency and gain. High-power fiber lasers commonly use ytterbium-doped double-clad fiber as the gain medium, with a stable resonator formed by a high-reflection (HR) fiber grating and an output-coupling (OC) fiber grating. Double-clad gratings with matching parameters couple efficiently to the doped fiber and are indispensable in high-power fiber lasers. We supply dedicated grating pairs for fiber-laser resonators. Mature double-clad grating inscription controls the HR/OC wavelength difference within 0.2nm, matching their center wavelengths. Special grating thermal management enables KW-level power handling to meet demanding reliability and performance requirements.