Patent ID: 7269312
Filing Date: 2007-09-11
Classification: G02B,H04B

Abstract:
1. A bipolar transversal filter, comprising: a first circulator for receiving a composite optical signal having optical signals at multiple wavelengths; a fiber grating coupled to said circulator, said fiber grating receiving said composite optical signal from said circulator and transmitting a reflected composite optical signal back to said circulator; and an optical filter receiving said reflected composite optical signal and providing optical signals at selected wavelengths at a first output and providing optical signals at other selected wavelengths at a second output, wherein said optical filter comprises: a second circulator receiving said reflected composite optical signal from said first circulator; an optical subfilter coupled to said second circulator, said optical subfilter passing optical signals at selected optical wavelengths to said first output and reflecting optical signals at other selected wavelengths back to said second circulator; and an optical delay element having an input coupled to said second circulator and an output coupled to said second output, said optical delay element receiving the optical signals reflected by the optical subfilter, wherein said optical delay element has an adjustable delay.