Very broad reflection bandwidth (44 nm) chirpedfibre gratings andnarrow bandpass filters produced by the use of an amplitude mask

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Abstract
Chirped gratings with very broad reflection bandwidths up to 44 nm and high reflectivity have been produced holographically in boron-codoped and standard telecommunications fibres which have been hydrogen-soaked. A 2 nm wide transmission band has been produced within the broad reflection band by use of an amplitude mask during grating exposure.