Abstract
Long period fiber gratings that couple light from guided core modes to non-guided cladding modes provide a means of introducing wavelength dependent losses in optical fiber systems.1 As a result, these in-fiber devices have found use as gain-equalizers in broadband optical fiber amplifiers,2 as band-rejection filters in high-power cascaded Raman fiber lasers and amplifiers,3 and as stabilizers in 980 nm pump diodes.4 In addition, the ability to access the cladding mode has rendered them sensitive to external perturbations such as temperature, pressure and refractive-index with obvious applications as sensors.5, 6 In this review, we highlight recent results and describe some of the key spectral and thermal properties of long-period fiber gratings.
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