title: Position weighting of fiber Bragg gratings for bandpass filtering.
abstract: A fiber Bragg grating bandpass filter with tailored refractive-index modulation is investigated. The writing method includes a position weighting technique, which provides flexible and accurate control of the index modulation along the fiber. This weighting is accomplished by adjusting the positions of a large number of overlapping subgratings to control the local grating strength. A 10-cm grating with a truncated sin(x)/x refractive-index modulation function was written and characterized with this method, showing good agreement with simulations. These types of filter are well suited for wavelength-division-multiplexing applications and can be made to have steep edges, low sidelobes, large bandwidth, and low stopband ripple.
authors.forename: H
authors.initials: H
authors.lastname: Storøy
authors.forename: H E
authors.initials: HE
authors.lastname: Engan
authors.forename: B
authors.initials: B
authors.lastname: Sahlgren
authors.forename: R
authors.initials: R
authors.lastname: Stubbe