Programmable Photonic Microwave Filters Monolithically Integrated in InP–InGaAsP

We demonstrate an integrated programmable photonic filter structure capable of producing bandpass filters with both tunable passband bandwidth and center frequency. Such filters could provide dynamic pre-filtering of very wide bandwidth analog microwave signals, essential to the next generation RF-front ends. The photonic filter is constructed from an array of uncoupled identical filter stages, each reconfigurable as a zero or a pole using an asymmetrical Mach-Zenhder Interferometer (MZI) structure with feedback. Integrated on a standard InP-InGaAsP material platform, semiconductor optical amplifiers (SOAs) and current injected phase modulators (PMs) are used to rapidly adjust the individual pole and zero locations, thereby reconfiguring the overall filter function. In this paper, we demonstrate cascaded filter structures with up to four filter stages, capable of producing a variety of higher order filters. Demonstrated filters have a free spectral range (FSR) of 23.5 or 47 GHz. A center frequency tunability over 28 GHz is demonstrated for a 2nd order bandpass filter, and a passband tunability of 1.9-5.4 GHz with stopband rejection >; 32 dB using 3rd and 4th order filters. Finally, the linearity of our active filters is investigated; a preliminary spurious-free dynamic range (SFDR) of 86.3 dB* Hz2/3 is obtained. However, we believe this number can be improved significantly by optimizing the design.

[1]  H. J. Shaw,et al.  Filter response of single-mode fibre recirculating delay lines , 1982 .

[2]  K.J. Williams,et al.  Measurement of harmonic distortion in microwave photodetectors , 1990, IEEE Photonics Technology Letters.

[3]  U. Koren,et al.  Intermodulation distortion in a multiple-quantum-well semiconductor optical amplifier , 1991, IEEE Photonics Technology Letters.

[4]  L. Coldren,et al.  Diode Lasers and Photonic Integrated Circuits , 1995 .

[5]  Jian H. Zhao,et al.  Optical Filter Design and Analysis: A Signal Processing Approach , 1999 .

[6]  R. Tucker,et al.  Theory and Measurement Techniques for the Noise Figure of Optical Amplifiers , 2000 .

[7]  Shih-Hui Chang,et al.  Improved optical filter responses in cascaded InGaAsP/InP microdisk resonators , 2001 .

[8]  T. Yoshimatsu,et al.  Measurement of intermodulation distortion in a unitraveling-carrier refracting-facet photodiode and a p-i-n refracting-facet photodiode , 2002, IEEE Photonics Technology Letters.

[9]  Larry A. Coldren,et al.  Demonstration of high saturation power/high gain SOAs using quantum well intermixing based integration platform , 2005 .

[10]  B. Ortega,et al.  A tutorial on microwave photonic filters , 2006, Journal of Lightwave Technology.

[11]  A. Agarwal,et al.  Fully programmable ring-resonator-based integrated photonic circuit for phase coherent applications , 2006, Journal of Lightwave Technology.

[12]  B. Krantz,et al.  RF Photonics for Radar Front-Ends , 2007, 2007 IEEE Radar Conference.

[13]  John E. Bowers,et al.  Hybrid silicon tunable filter based on a Mach-Zehnder interferometer and ring resonantor , 2009, 2009 International Topical Meeting on Microwave Photonics.

[14]  Larry A. Coldren,et al.  Programmable photonic filters fabricated with deeply etched waveguides , 2009, 2009 IEEE International Conference on Indium Phosphide & Related Materials.

[15]  M. Alouini,et al.  Spurious-free dynamic range of a tunable delay line based on slow light in SOA , 2009, 2009 International Topical Meeting on Microwave Photonics.

[16]  T K Woodward,et al.  A programmable optical filter unit cell element for high resolution RF signal processing in silicon photonics , 2010, 2010 Conference on Optical Fiber Communication (OFC/NFOEC), collocated National Fiber Optic Engineers Conference.

[17]  Larry A. Coldren,et al.  A monolithic programmable optical filter for RF-signal processing , 2010, 2010 IEEE International Topical Meeting on Microwave Photonics.

[18]  Larry A. Coldren,et al.  Monolithically integrated programmable photonic microwave filter with tunable inter-ring coupling , 2010, 2010 IEEE International Topical Meeting on Microwave Photonics.

[19]  R. S. Guzzon,et al.  Programmable Photonic Lattice Filters in InGaAsP–InP , 2010, IEEE Photonics Technology Letters.

[20]  Kun-Yii Tu,et al.  Silicon RF-Photonic Filter and Down-Converter , 2010, Journal of Lightwave Technology.

[21]  Larry A. Coldren,et al.  Programmable Photonic Filters from Monolithically Cascaded Filter Stages , 2010 .

[22]  S J B Yoo,et al.  Fully Reconfigurable Silicon Photonic Lattice Filters With Four Cascaded Unit Cells , 2011, IEEE Photonics Technology Letters.

[23]  W. Marsden.  I and J , 2012 .