Narrow-band rejection filters with negligible backreflection using tilted photoinduced gratings in single-mode fibers

Suppression of the forward propagating LP/sub 01/ core mode of >17 dB with <-30-dB backreflection over a narrow wavelength band is demonstrated utilizing a tilted photoinduced Bragg grating in a deep depressed inner cladding single-mode fiber (SMF). Theoretical and experimental results detailing the tilted grating filter performance in matched cladding, depressed inner cladding, and photosensitive cladding SMF's are presented.