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Realisation of Butterworth-type optical filters using 3×3 coupler ring resonators

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3 Author(s)
Binh, L.N. ; Dept. of Electr. & Comput. Syst. Eng., Monash Univ., Clayton, Vic., Australia ; Thien, N.X. ; Ngo, N.Q.

Butterworth-type optical filters are realised using a combination of optical resonators which exhibit a single pole and single zero transfer function, quasi-all zero and quasi-all pole optical circuits. Design procedures as well as filter structures are proposed for optical lowpass, highpass and bandpass optical filters of even and odd orders. In particular, the [3×3] planar optical directional coupler has been employed with a direct feedback path and a single optical delay feedback to form a single-pole single-zero optical resonator. This is the basic block of cascaded sections of optical filters. [2×2] optical directional couplers have also been employed to construct interferometers and resonators having quasi-all pole or all zeros characteristics for cascading with the double feedback resonators to implement odd- and even-order modular optical filters

Published in:

Optoelectronics, IEE Proceedings -  (Volume:143 ,  Issue: 2 )