Abstract
The control of light propagation inside optical fibers is essential for a broad variety of applications from sensing to high-power fiber lasers. As an example, long period gratings (LPG) enable the defined coupling of modes guided in the fiber core into co-propagating cladding modes [1]. Thus, they can be used as efficient spectral filter elements e.g. for the suppression of stimulated Raman scattering in high-power fiber laser applications [2]. Fig. 1a shows an example of the transmission spectrum of a LPG written into a single mode fiber (9µm core, 125 µm cladding diameter) by means of ultrashort laser pulses. The spectrum shows distinct and strong resonance peaks with simultaneously minimal out of band losses.
© 2017 IEEE
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