Abstract
A technique that enables two or more infinite impulse response optical
delay lines to be connected in series without the coherent interference problem
is presented. It is based on inserting an optical frequency shifter into the
infinite impulse response optical delay line structure. Signal processors
based on the cascaded optical delay line structure have a higher frequency
response performance than the single optical delay line structure. Experimental
results are presented, which demonstrate a dual series frequency shifting
amplified recirculating delay line can realise a high-resolution, high skirt
selectivity, high stopband rejection level bandpass filter response, and a
narrow-passband, flat-top bandpass filter response using a non-commensurate
delay line approach.
© 2011 IEEE
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