NARROW TRANSMISSION BANDPASS FILTERS UTILISING BRAGG GRATING ASSISTED MODE CONVERSION

摘要

A method of creating an optical filter for selectively filtering an optical signal transmitted through said filter, said method comprising: constructing a Bragg grating in an optical element (2) coupled (3, 4) to an optical pathway (8) for the transmission of said optical signal to suppress background radiation; and adjusting (6, 7) said coupling so as to produce a selective transmission spectrum in accordance with predetermined requirements.