A Tunable Broadband Photonic RF Phase Shifter Based on a Silicon Microring Resonator

Dept. of Electron. Eng., Shanghai Jiao Tong Univ., Shanghai
IEEE Photonics Technology Letters (Impact Factor: 2.11). 02/2009; 21(1):60 - 62. DOI: 10.1109/LPT.2008.2008658
Source: IEEE Xplore


We propose and demonstrate a tunable broadband photonic radio frequency (RF) phase shifter based on a silicon microring resonator. This scheme utilizes the thermal nonlinear effect of the silicon microring to change the electrical phase of the RF signal with a wide tuning range. A prototype of the phase shifter is experimentally demonstrated for a 40-GHz signal with a 0-4.6-rad tuning range.

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    • "The phase-shift tuning range approaches to 2π and is improved by ~30% Fig. 12. Experimental setups for system demonstration of tunable RF phase shifting. in comparison with that in our previous work [21]. Fig. 13(c) depicts the phase shift versus the power of the control light for 20-GHz, 30-GHz, and 40-GHz RF signals. "
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    • "Therefore, generation of two orthogonally polarized phase-modulated signals with complementary phase modulation is indispensable to their approach. Furthermore, silicon-on insulator (SOI) micro-ring resonators (MRRs) have been used as phase shifters [9], [10]. However, it is difficult to realize a full 360 phase shift by using a single MRR, which limits its practical applications in microwave systems. "
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    • "In [4], for instance, a phase shifter based on wavelength conversion in a distributed feedback laser is demonstrated, and in [5] the phase tuning was achieved by changing the optical carrier wavelength by means of stimulated Brillouin scattering (SBS) in optical fiber. For narrowband phase shift, silicon-on-insulator (SOI) ring resonators have been used as widely tunable RF phase shifters [6]. Furthermore, phase shifts can also be achieved based on slow-and fast-light effects induced by coherent population oscillations (CPOs) in semiconductor optical amplifiers (SOAs) [7]. "
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