Integrated InP-InGaAsP tunable coupled ring optical bandpass filters with zero insertion loss

Second and third-order monolithically integrated coupled ring bandpass filters are demonstrated in the InP-InGaAsP material system with active semiconductor optical amplifiers (SOAs) and current injection phase modulators (PMs). Such integration achieves a high level of tunability and precise genera...

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Bibliographic Details
Published in:Optics express 2011-04, Vol.19 (8), p.7816-7826
Main Authors: Guzzon, Robert S, Norberg, Erik J, Parker, John S, Johansson, Leif A, Coldren, Larry A
Format: Article
Language:English
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Summary:Second and third-order monolithically integrated coupled ring bandpass filters are demonstrated in the InP-InGaAsP material system with active semiconductor optical amplifiers (SOAs) and current injection phase modulators (PMs). Such integration achieves a high level of tunability and precise generation of optical filters in the RF domain at telecom wavelengths while simultaneously compensating for device insertion loss. Passband bandwidth tunability of 3.9 GHz to 7.1 GHz and stopband extinction up to 40 dB are shown for third-order filters. Center frequency tunability over a full free spectral range (FSR) is demonstrated, allowing for the placement of a filter anywhere in the telecom C-band. A Z-transform representation of coupled resonator filters is derived and compared with experimental results. A theoretical description of filter tunability is presented.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.19.007816