Tunable Microwave Phase Shifter Based on Silicon-on-Insulator Microring Resonator

Abstract

Abstract-We demonstrate microwave phase shifters based on electrically tunable silicon-on-insulator microring resonators (MRRs). MRRs with different quality factors are fabricated and tested. A continuously tunable phase shift of up to 336 at a microwave frequency of 40 GHz is obtained using a high-quality-factor ( 28 000) MRR with only 1.6-mW power consumption. A quasi-linear phase shift in the range of 0 -204 at 40 GHz with a radio-frequency power variation less than 1.3 dB is also achieved by using a lower-quality-factor MRR.

Microwave phase shifter with 25-GHz dense wavelength division multiplexing channel spacing tuning using multimode interferometer-coupled microring resonator

“…, the over-coupling condition a > t for the phase shifting was also satisfied. 5 4 Conclusions A wide-operating wavelength range and high-fabrication tolerance for the MMI coupler had been implemented on the SOI-based MRR for microwave phase tuning function. For the highest phase tuning range, the MMI-coupled MRR was designed and fabricated with a circumference of 110 μm and a stable-quality-factor of 1199 across a wide range of wavelengths.…”

“…4 Recently, a photonic microwave phase shifter utilizing a silicon-on-insulator (SOI) microring resonator (MRR) by the directional coupler, which was experimentally showing a 0-deg to 336-deg phase shifting range by the thermo-optical tuning, is proposed. 5 In Fig. 1, the optical tap could be implemented in the dense wavelength division multiplexing (DWDM) system, formed by a multiplexer, a optical amplifier, and a demultiplexer, to fully utilize 25-GHz channel spacing for microwave phase management through the thermal tuning photonic bus.…”

“…To meet the highest phase tuning range, the SOI MRR was designed for a low quality factor under the over-coupling condition. 5 …”

Tunable complex-valued multi-tap microwave photonic filter based on single silicon-on-insulator microring resonator

“…Several approaches spanning different technology platforms have already been demonstrated for the implementation of tunable phase shifting and true time delaying functionalities [13][14][15][16][17][18][19][20][21]. Among them, impressive results have already been reached in solutions based on semiconductor waveguides [13,14], nonlinear effects in optical fibers [15,16], photonic crystal (PhC) waveguides [17,18] and silicon-oninsulator (SOI) microring resonators (MRR) [19][20][21]. Concerning semiconductor waveguides, a notch-type filter at 30 GHz with 100% fractional tuning without changing the shape of the spectral response over a 30 MHz bandwidth has already been demonstrated [22].…”

“…Tunability is accomplished by exploiting the phase-shift feature provided by the SOI MRR in combination with using optical single-sideband (OSSB) modulation in order to implement complex-valued taps. The tuning control mechanism is based on the fine adjustment of the different emission wavelengths instead of thermo-optical effects, as reported in [20][21]. The impact of the number of taps on the degree of tunability is deeply characterized.…”