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

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.