Arbitrary Microwave Waveform Generation Based on a Tunable Optoelectronic Oscillator

Photonic generation of a phase-coded or frequency-chirped microwave waveform with a tunable microwave carrier frequency using a frequency-tunable optoelectronic oscillator (OEO) is proposed and experimentally demonstrated, for the first time to the best of our knowledge. In the proposed system, the tunable OEO has functions to generate a frequency-tunable microwave signal and to output an optical sideband. The optical sideband and a portion of the light wave from the OEO laser source are sent to a polarization modulator (PolM), with their polarization directions aligned with the two principal axes of the PolM. An electrical signal is applied to the PolM, and two complementary phase-coded or frequency-chirped light waves are generated which are converted to an electrical signal by beating the light waves at a high-speed photodetector. The key significance of the technique is that a phase-coded or frequency-chirped microwave waveform with a tunable microwave carrier frequency and a reconfigurable phase-coding or frequency-chirping pattern can be generated without using a separate microwave source. The technique is experimentally verified. The generation of a binary- and a polyphase-coded microwave waveform with a microwave carrier frequency at 10 and 15 GHz is demonstrated. The generation of a linearly frequency-chirped microwave waveform with a chip rate of 20.98 GHz/ns at a 10-GHz carrier frequency and 22.5 GHz/ns at a 15-GHz carrier frequency is also achieved.

[1]  Wei Li,et al.  Photonic Generation of Phase Coded Microwave Pulses Using Cascaded Polarization Modulators , 2013, IEEE Photonics Technology Letters.

[2]  Jianping Yao,et al.  A Wideband Frequency Tunable Optoelectronic Oscillator Incorporating a Tunable Microwave Photonic Filter Based on Phase-Modulation to Intensity-Modulation Conversion Using a Phase-Shifted Fiber Bragg Grating , 2012, IEEE Transactions on Microwave Theory and Techniques.

[3]  W. J. Bradford,et al.  Digital generation of high time-bandwidth product linear FM waveforms for radar altimeters , 1992 .

[4]  D. K. Barton,et al.  Radar system analysis and modeling , 2004, IEEE Aerospace and Electronic Systems Magazine.

[5]  P. Ghelfi,et al.  Photonic Generation of Phase-Modulated RF Signals for Pulse Compression Techniques in Coherent Radars , 2012, Journal of Lightwave Technology.

[6]  Shilong Pan,et al.  Generation of phase-coded microwave signals using a polarization-modulator-based photonic microwave phase shifter. , 2013, Optics letters.

[7]  Jianping Yao,et al.  Photonic Generation of Phase-Coded Millimeter-Wave Signal With Large Frequency Tunability Using a Polarization-Maintaining Fiber Bragg Grating , 2011, IEEE Microwave and Wireless Components Letters.

[8]  B. Kang,et al.  Linear frequency modulation of voltage-controlled oscillator using delay-line feedback , 2005 .

[9]  Xianmin Zhang,et al.  Photonic Generation of Phase-Coded Microwave Signal With Large Frequency Tunability , 2011, IEEE Photonics Technology Letters.

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

[11]  Jianping Yao,et al.  Photonic Generation of a Phase-Coded Microwave Waveform With Ultrawide Frequency Tunable Range , 2013, IEEE Photonics Technology Letters.

[12]  Chao Wang,et al.  Phase-Coded Millimeter-Wave Waveform Generation Using a Spatially Discrete Chirped Fiber Bragg Grating , 2012, IEEE Photonics Technology Letters.

[13]  Hiroshi Kato,et al.  40-GHz electro-optic polarization modulator for fiber optic communications systems , 2004, Photonics North.

[14]  Minghao Qi,et al.  Ultrabroad-bandwidth arbitrary radiofrequency waveform generation with a silicon photonic chip-based spectral shaper , 2010 .

[15]  Chao Wang,et al.  Fourier Transform Ultrashort Optical Pulse Shaping Using a Single Chirped Fiber Bragg Grating , 2009, IEEE Photonics Technology Letters.

[16]  Fabrizio Berizzi,et al.  Photonic generation of microwave phase coded radar signal , 2012 .

[17]  Jianping Yao,et al.  A Narrow-Passband and Frequency-Tunable Microwave Photonic Filter Based on Phase-Modulation to Intensity-Modulation Conversion Using a Phase-Shifted Fiber Bragg Grating , 2012, IEEE Transactions on Microwave Theory and Techniques.