Abstract

A new technique to design an all-fiber temporal differentiator that has a large bandwidth and an arbitrary differentiation order is proposed and investigated. The proposed temporal differentiator is a special fiber Bragg grating (FBG) that is designed by controlling its magnitude and phase responses with the discrete layer peeling (DLP) method. There are three important features of this technique: 1) the temporal differentiator has an arbitrary magnitude response and a controllable bandwidth; 2) the temporal differentiator can be designed and fabricated with an arbitrary differentiation order that is realized in a single FBG; 3) the required maximum index modulation of the FBG-based differentiator is largely decreased by using a Gaussian windowing function. The use of the proposed technique to design temporal differentiators with a differentiation order up to the fourth and with a bandwidth up to 500 GHz is studied. A proof-of-concept experiment is then carried out. A first- and a second-order temporal differentiator with a bandwidth of 25 GHz are experimentally demonstrated.

© 2009 OSA

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History
Original Manuscript: July 17, 2009
Manuscript Accepted: September 14, 2009
Revised Manuscript: September 5, 2009
Published: October 16, 2009

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Author Affiliations

Davide Janner, Valerio Pruneri

ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels, Spain

Ming Li, Jianping Yao

Microwave Photonics Research Laboratory, School of Information Technology and Engineering 
University of Ottawa, Ottawa, ON, K1N 6N5, Canada

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