Wayne F. Varner

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 SMFs are presented.

Narrow-depressed cladding fiber design for minimization of cladding mode losses in azimuthally asymmetric fiber Bragg gratings

The cladding and radiation mode loss characteristics of photo-induced gratings written in fibers with a narrow-depressed inner cladding are compared to the properties of gratings written in matched clad, photosensitive clad, and wide-depressed cladding fibers under varying grating azimuthal asymmetry conditions. Fibers with narrow-depressed claddings are found to have lower cladding mode losses for small degrees of asymmetry than previously proposed fiber designs for cladding-mode reduction.