Patent ID: 6185023
Filing Date: 2001-02-06
Classification: G02B,H04J

Abstract:
An optical add-drop multiplexer comprising:an optical path configured to carry a wavelength division multiplexed optical communication signal having one or more optical channels each at a respective wavelength;a first Bragg grating, positioned along said optical path, configured to reflect an optical wavelength included in said multiplexed optical signal, wherein said first Bragg grating is also configured to transmit a portion of said optical wavelength;a second Bragg grating, positioned along said optical path, configured to reflect said optical wavelength; andoptical isolation means interposed between said first and second Bragg gratings, wherein said optical isolation means is configured to attenuate said portion of said optical wavelength transmitted by said first Bragg grating and reflected by said second Bragg grating sufficiently to prevent optical resonances from being formed between said first and second Bragg gratings.