Tunable 360° Photonic Radio-Frequency Phase Shifter Based on Polarization Modulation and All-Optical Differentiation

A continuously tunable photonic radio-frequency (RF) phase shifter based on polarization modulation and all-optical differentiation using a polarization modulator (PolM) and an optical frequency discriminator is proposed, theoretically analyzed and experimentally demonstrated. In the proposed phase shifter, two light waves at different wavelengths are injected into a PolM which is driven by an RF signal to be phase shifted. For one wavelength, the state of polarization (SOP) of the light wave is aligned with one principal axis of the PolM, thus the PolM operates jointly with an optical frequency discriminator as an optical differentiator to produce a quadrature (Q) signal. For the other wavelength, the SOP of the light wave is oriented with 45° or 135° with the principal axis of the PolM, thus the PolM operates jointly with a polarizer as an intensity modulator to produce an in-phase (I) signal. By detecting the I-Q optical signals at a photodetector (PD), a phase-shifted RF signal is generated. The value of the phase shift is determined by the amplitudes of the I-Q signals, which can be continuously tuned by controlling the powers of the light waves. An experiment is performed. A phase shifter with a full tunable range of 360° at an RF frequency tunable from 3 to 10 GHz is demonstrated.

[1]  J. Capmany,et al.  Discrete-time optical Processing of microwave signals , 2005, Journal of Lightwave Technology.

[2]  Larry R. Dalton,et al.  Demonstration of a photonically controlled RF phase shifter , 1999 .

[3]  Changyuan Yu,et al.  Linear photonic radio frequency phase shifter using a differential-group-delay element and an optical phase modulator. , 2010, Optics letters.

[4]  Woo-Young Choi,et al.  Photonic phase shifters based on a vector-sum technique with polarization-maintaining fibers. , 2005, Optics letters.

[5]  H. Erlig,et al.  Multiple output photonic RF phase shifter using a novel polymer technology , 2002, IEEE Photonics Technology Letters.

[6]  Jianping Yao,et al.  Tunable microwave photonic phase shifter based on slow and fast light effects in a tilted fiber Bragg grating. , 2012, Optics express.

[7]  Yikai Su,et al.  A Tunable Broadband Photonic RF Phase Shifter Based on a Silicon Microring Resonator , 2009, IEEE Photonics Technology Letters.

[8]  Widely tunable microwave photonic filter based on semiconductor optical amplifier , 2010, Asia Communications and Photonics Conference and Exhibition.

[9]  Jianping Yao,et al.  Photonics for ultrawideband communications , 2009, IEEE Microwave Magazine.

[10]  Jesper Mørk,et al.  Microwave phase shifter with controllable power response based on slow- and fast-light effects in semiconductor optical amplifiers. , 2009, Optics letters.

[11]  I. Gasulla,et al.  2π microwave photonic phase shifter based on single semiconductor optical amplifier , 2011, 2011 International Topical Meeting on Microwave Photonics jointly held with the 2011 Asia-Pacific Microwave Photonics Conference.

[12]  Weifeng Zhang,et al.  Photonic Generation of Millimeter-Wave Signals With Tunable Phase Shift , 2012, IEEE Photonics Journal.

[13]  Toshihiko Baba,et al.  Slow light in photonic crystals , 2008 .

[14]  Bingkun Zhou,et al.  Tunable 360° photonic radio frequency phase shifter based on optical quadrature double-sideband modulation and differential detection. , 2011, Optics letters.

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

[16]  Wei Li,et al.  Photonic Phase Shifter Based on Wavelength Dependence of Brillouin Frequency Shift , 2011, IEEE Photonics Technology Letters.

[17]  A. Loayssa,et al.  Broad-band RF photonic phase shifter based on stimulated Brillouin scattering and single-sideband modulation , 2006, IEEE Photonics Technology Letters.

[18]  T. Chio,et al.  Wideband RF photonic vector sum phase-shifter , 2003 .

[19]  J. F. Coward,et al.  A photonic integrated-optic RF phase shifter for phased array antenna beam-forming applications , 1993 .

[20]  K. Williams,et al.  Microwave photonics , 2002 .