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Synthesis of coherent two-port optical delay-line circuit with ring waveguides

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1 Author(s)
Jinguji, K. ; NTT Opto-Electron. Labs., Ibaraki, Japan

A method has already been reported by the author and others for synthesizing coherent two-port lattice-form optical delay-line circuits which have the same filter characteristics as finite impulse response (FIR) digital filters. This paper proposes a two-port circuit configuration with ring waveguides which can realize the same filter characteristics as infinite impulse response (IIR) digital filters. It also describes a synthesis method for realizing arbitrary IIR filter characteristics with the circuit configuration. This method is based on scattering matrix factorization. Some synthesis examples are demonstrated including an elliptic filter, a Butterworth filter, an optical filter with maximally flat group-delay characteristics, a group-delay dispersion equalizer, and a multichannel selector

Published in:

Lightwave Technology, Journal of  (Volume:14 ,  Issue: 8 )