Fatima Bakhti

Design and realization of multiple quarter-wave phase-shifts UV-written bandpass filters in optical fibers

Ultraviolet (UV)-written optical fiber bandpass filters based on multiple quarter-wave phase-shifts, up to eight, are presented and modeled. It is demonstrated that the shape of the bandpass peak can be tailored by optimization of the phase-shifts locations. We show that flat top bandpass peak with negligible ripples (<0.01 dB) at the top can be designed and that a tradeoff between nearly rectangular shape and stopband width occurs when gratings containing more than two phase-shifts are to be used. We also present experimental spectral responses of gratings with up to three phase-shifts and comparisons with theoretical results.

Passive optical components for WDM applications

The development of dense WDM-systems for growing data transmission rates requires optical components with well defined spectral properties for multiplexing and demultiple4xing, gain equalization, dispersion management, and routing. Among the various concepts for realizing WDM- devices those based on guided waves have achieved a high performance: Arrayed Waveguide Gratings (AWGs) for high channel counts fabricated with a silica-on-silicon technology and Fiber Bragg Gratings for their performance in gain equalization and dispersion compensation. They also are used in ADMs and multiple WDM-sources.