Microphotonic interference mitigation filter for radio astronomy telescopes

MicroPhotonic broadband RF signal processors utilize the capability of photons to perform true-time delay processing at very low loss that is unattainable by conventional electronic methods. In this paper, we present a novel MicroPhotonic interference mitigation filter architecture that utilises a CMOS Si photoreceiver/VCSEL array in conjunction with a true-time-delay multi-cavity optical substrate to realise an adaptive transversal RF processor with arbitrary response. Results show that the proposed MicroPhotonic structure can synthesize adaptive interference mitigation with a shape factor (ratio of the -40dB bandwidth to the -3dB bandwidth) as low as 2 and passband ripples less than 0.25dB.

[1]  Yihong Chen,et al.  A fully packaged true time delay module for a K-band phased array antenna system demonstration , 2002, IEEE Photonics Technology Letters.

[2]  M. Frankel,et al.  Fiber-optic tunable microwave transversal filter , 1995 .

[3]  Robert A. Minasian,et al.  Photonic signal processing of microwave signals , 2006 .

[4]  C.M. Keller,et al.  Multichannel adaptive beamforming and interference mitigation in multiuser CDMA systems , 1999, Conference Record of the Thirty-Third Asilomar Conference on Signals, Systems, and Computers (Cat. No.CH37020).

[5]  Andreas Reigber,et al.  A phase preserving method for RF interference suppression in P-band synthetic aperture radar interferometric data , 1999, IEEE 1999 International Geoscience and Remote Sensing Symposium. IGARSS'99 (Cat. No.99CH36293).

[6]  R.D. Esman,et al.  Fiber-optic tunable microwave transversal filter , 1995, IEEE Photonics Technology Letters.

[7]  K. Alameh,et al.  High skirt selectivity photonics-based bandpass filters , 2002, 2001 International Topical Meeting on Microwave Photonics. Technical Digest. MWP'01 (Cat. No.01EX476).