Abstract

Fiber gratings are fabricated by exposing the core of a germanosilicate fiber to an intense UV fringe pattern, thereby producing a periodic index modulation in the fiber core. A light propagating in such a grating experiences a reflection - in the case of a short-period or fiber Bragg grating (FBG) - or a coupling with codirectional cladding mode - in the case of a long-period fiber grating (LPFG) - over a narrow wavelength region centered at some resonant wavelength. Therefore, fiber gratings can be tailored to act as wavelength-selective optical components such as mirrors, filters, partial reflectors or sensors, and furthermore, are ideal for integrating with fiber-based telecommunication, laser, or sensor systems.

© 2001 IEEE