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Photosensitive Fiber for Fiber Gratings

Photosensitive Fiber for Fiber Gratings
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Photosensitive Fiber for Fiber Gratings - 1

P h o t o n i c s a n d I n s t r u m e n t a t i o n 401 Email: sales@newport.com • Web: newport.com Photosensitive Fibers for Fiber Gratings ëb ë UV Laser Source Induced Refractive Index Grating Fiber Core Input Signal ëb ë Reflected Signal ëb ë Transmitted Signal Fiber Bragg Gratings and long period gratings can be constructed using Newport’s Photosensitive Fibers by exposing these fibers to periodic patterns of UV light. Such gratings can form the basis of devices such as wavelength-selective filters, narrow-band mirrors or sensors. Compared to regular fibers, requiring lengthy UV exposure, the intrinsic photosensitivity of these fibers allows for short UV exposures times without the hassles and potential dangers of hydrogen loading. A 1 nm-wide, 47 dB deep 15 mm-long transmission grating can be written in these fibers in 10 minutes by a pulsed Excimer Laser (10 Hz, 0.5 J/cm2, 248 nm). Splicing losses to a SMF-28 single-mode telecom fiber are typically less than 0.2 dB. • Ge and B doped to increase sensitivity to UV light • Narrow-band, high-reflectance Bragg gratings may be written in the core • Compatible with telecom fibers What are Fiber Bragg Gratings? A Bragg Grating is a periodic modulation in the fiber’s index of refraction reflecting light with a wavelength of twice the grating period. The grating forms when the fiber is exposed to a periodic pattern of UV light, typically generated with a phase mask. Fiber lasers and DWDM add/drop filters utilize the ability of Bragg Gratings to reflect <99% of the light in a narrow wavelength band (~1 nm). Such gratings may typically be written in a few minutes by focused CW, 100 mW, 244 nm light — second harmonic of Argon Laser — or 248 nm Excimer Laser (10 Hz, 0.5 J/cm2). Other uses of fiber gratings include laser diode frequency stabilization and fiber sensors that detect chemicals, mechanical strain, vibration, acceleration or temperature. Gratings may also be chirped to provide dispersion compensation or gain flattening. Specifications Model Operating Wavelength (nm) Index Profile NA Mode Field Diameter, Nominal (ìm) Cladding Diameter (ìm) Coating Diameter (ìm) Background Loss (dB/km) Cut-off Wavelength (nm) Buffer Coating Material F-SBG-13 1310 Step 0.12–0.14 8.1 125 ±1 245 ±12 25 1100–1260 Acrylate F-SBG-15 1550 Step 0.12–0.14 9.6 125 ±1 245 ±12 100 1100–1260 Acrylate Ordering Information For ordering information and connectorization options, please see page 384. POLARIZATION MEASUREMENT AND CONTROL LASER DIODE CONTROL LASER DIODE MOUNTS FIBER OPTIC COMPONENTS OPTICAL FIBERS AND ACCESSORIES EDUCATIONAL KITS

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