Nonuniformly Spaced Photonic Microwave Delay-Line Filters and Applications

A finite impulse response (FIR) filter for microwave signal processing implemented based on an optical delay-line structure with uniformly spaced taps has been extensively investigated, but the realization of such a filter with negative or complex tap coefficients to provide an arbitrary frequency response is still a challenge. In this paper, an overview of photonic microwave delay-line filters with nonuniformly spaced taps, by which an arbitrary bandpass frequency response can be achieved with all-positive tap coefficients, is presented. We show that the nonuniform time delays provide equivalent phase shifts to the tap coefficients, while the all-positive-coefficient nature simplifies greatly the filter realization. Based on the theory, a 50-tap flat-top bandpass filter with a quadratic phase response is designed and analyzed. A seven-tap nonuniformly spaced photonic microwave filter with a flat-top and chirp-free bandpass response is then demonstrated. The use of the proposed technique for advanced microwave signal processing is then discussed. The generation of a chirped microwave signal and a phase-coded microwave signal are discussed and demonstrated. The use of the proposed technique to design a FIR filter for microwave matched filtering is also discussed and experimentally demonstrated.

[1]  Yitang Dai,et al.  Microwave pulse phase encoding using a photonic microwave delay-line filter. , 2007, Optics letters.

[2]  N. You,et al.  A novel tunable microwave optical notch filter , 2001 .

[3]  J. McKinney,et al.  Millimeter-wave arbitrary waveform generation with a direct space-to-time pulse shaper. , 2002, Optics letters.

[4]  Jianping Yao,et al.  Nonuniformly-spaced photonic microwave delayline filter. , 2008, Optics express.

[5]  R.A. Minasian,et al.  Photonic signal processing of microwave signals , 2004, IEEE Transactions on Microwave Theory and Techniques.

[6]  A. W. Rihaczek.  Principles of high-resolution radar , 1969 .

[7]  J. Capmany,et al.  Microwave photonic filters with negative coefficients based on phase inversion in an electro-optic modulator. , 2003, Optics letters.

[8]  J. Capmany,et al.  Experimental demonstration of fibre-optic delay line filters with negative coefficients , 1995 .

[9]  Chao Wang,et al.  Photonic Generation of Chirped Millimeter-Wave Pulses Based on Nonlinear Frequency-to-Time Mapping in a Nonlinearly Chirped Fiber Bragg Grating , 2008, IEEE Transactions on Microwave Theory and Techniques.

[10]  J. Capmany,et al.  Demonstration of incoherent microwave photonic filters with all-optical complex coefficients , 2006, IEEE Photonics Technology Letters.

[11]  Jianping Yao,et al.  Investigation of phase-modulator-based all-optical bandpass microwave filter , 2005, Journal of Lightwave Technology.

[12]  J. McKinney,et al.  Photonic microwave arbitrary waveform generation using a virtually imaged phased-array (VIPA) direct space-to-time pulse shaper , 2004, IEEE Photonics Technology Letters.

[13]  Fei Zeng,et al.  All-optical bandpass microwave filter based on an electro-optic phase modulator. , 2004, Optics express.

[14]  Kam Tai Chan,et al.  Tunable all-optical incoherent bipolar delay-line filter using injection-locked Fabry-Perot laser and fibre Bragg gratings , 2000 .

[15]  R. Minasian,et al.  Novel all-optical RF notch filters with equivalent negative tap response , 2004, IEEE Photonics Technology Letters.

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

[17]  I. Bennion,et al.  A novel tunable all-optical incoherent negative-tap fiber-optic transversal filter based on a DFB laser diode and fiber Bragg gratings , 2000, IEEE Photonics Technology Letters.

[18]  Jianping Yao,et al.  All-optical microwave bandpass filters implemented in a radio-over-fiber link , 2005, IEEE Photonics Technology Letters.

[19]  B. Jalali,et al.  Adaptive RF-photonic arbitrary waveform generator , 2003, IEEE Photonics Technology Letters.

[20]  Mario Bertero,et al.  Image restoration in chirp-pulse microwave CT (CP-MCT) , 2000, IEEE Transactions on Biomedical Engineering.

[21]  Fei Zeng,et al.  Photonic Microwave Filter with Negative Coefficients Based on Cross Polarization Modulation in a Semiconductor Optical Amplifier , 2007, OFC/NFOEC 2007 - 2007 Conference on Optical Fiber Communication and the National Fiber Optic Engineers Conference.

[22]  D Pastor,et al.  Tunable all-optical negative multitap microwave filters based on uniform fiber Bragg gratings. , 2003, Optics letters.

[23]  Yitang Dai,et al.  Chirped Microwave Pulse Generation Using a Photonic Microwave Delay-Line Filter With a Quadratic Phase Response , 2009, IEEE Photonics Technology Letters.

[24]  B. Jalali,et al.  All-optical RF filter using amplitude inversion in a semiconductor optical amplifier , 1997 .

[25]  Yitang Dai,et al.  Microwave Correlator Based on a Nonuniformly Spaced Photonic Microwave Delay-Line Filter , 2009, IEEE Photonics Technology Letters.

[26]  Jianping Yao,et al.  A Tunable Photonic Microwave Filter With a Complex Coefficient Using an Optical RF Phase Shifter , 2007, IEEE Photonics Technology Letters.