High quality fiber Bragg gratings (FBGs) and long period gratings (LPGs) can be constructed using Newport’s Photosensitive Fibers by exposing these optical fibers to periodic patterns of UV light. Such fiber gratings form the basis of fiber optic devices such as wavelength-selective filters, narrow-band mirrors, WDMs, add-drop multiplexers, and sensors. Also, FPGs are used to form a laser cavity in a fiber laser, an external cavity laser, or a wavelength stabilized laser. The numerical aperture and mode field diameter is matched to those of standard single-mode fiber, such as SMF-28, so that fusion splices result in losses of ~ 0.05 dB. The fiber core is boron-codoped and intrinsically photosensitive, without requiring hydrogen doping. With this fiber, a 1 nm-wide, 47 dB deep 15 mm-long transmission grating can be written in these fibers within a few minutes by a pulsed Excimer Laser (10 Hz, 0.5 J/cm2, 248 nm).
The following volume discount schedule is automatically applied when ordering bare optical fiber: 6 - 50 m with 15 %, 51- 1,000 m with 22 %, > 1,000 m with 25 %. Discount applicable to continuous length of fiber.
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.
The fiber core is boron-codoped and intrinsically photosensitive, without requiring hydrogen doping. The core size is well compatible with the telcom fibers. With this fibers, a 1 nm-wide, 47 dB deep 15 mm-long transmission grating can be written in these fibers within a few minutes by a pulsed Excimer Laser (10 Hz, 0.5 J/cm2, 248 nm).
Related Products
1918-R (see Optical Power Meter, High-Performance Hand-Held, 1918-R)
