Optimization of tilted fiber Bragg grating and micro-etched cladding for high efficient out-coupling of cladding mode

The cladding mode generated by the tilted fiber Bragg grating is out-coupled to optical power detector by the total internal reflection at the micro-etched cladding. Optimization of the tilted fiber Bragg grating and micro-etched cladding for high efficient out-coupling of cladding mode was discussed theoretically. Over 32 % power of the cladding mode is out-coupled by the micro-etched cladding. In addition, as much as 90 % power of the input power is experimentally detected using the avalanche photodiode.