Widely tunable microwave phase shifter based on silicon-on-insulator dual-microring resonator

Pu, Minhao; Liu, Liu; Xue, Weiqi; Ding, Yunhong; Ou, Haiyan; Yvind, Kresten; Hvam, Jørn Märcher

doi:10.1364/oe.18.006172

Cited by 81 publications

(35 citation statements)

References 16 publications

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“…Examples of photonic MPS architectures or technologies are the use of stimulated Brillouin scattering (SBS) [9] or the SOA based implementation [10], whose working principle is based on the slow and fast light phenomenon due to coherent population oscillation (CPO) [11]. Besides, silicon on insulator (SOI) ring resonators have been used to perform the same functionality in narrowband systems [12][13], and fiber Bragg gratings have also been proposed to accurately tune the phase-shift (FBGs) [14]. However, although these technologies allow an efficient control of the microwave phase shift they also present some drawbacks that may limit their practical applications.…”

Section: Introductionmentioning

confidence: 99%

MWP phase shifters integrated in PbS-SU8 waveguides

Hervás¹,

Suárez²,

Pérez³

et al. 2015

Opt. Express

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Abstract:We present new kind of microwave phase shifters (MPS) based on dispersion of PbS colloidal quantum dots (QDs) in commercially available photoresist SU8 after a ligand exchange process. Ridge PbS-SU8 waveguides are implemented by integration of the nanocomposite in a silicon platform. When these waveguides are pumped at wavelengths below the band-gap of the PbS QDs, a phase shift in an optically conveyed (at 1550 nm) microwave signal is produced. The strong light confinement produced in the ridge waveguides allows an improvement of the phase shift as compared to the case of planar structures. Moreover, a novel ridge bilayer waveguide composed by a PbS-SU8 nanocomposite and a SU8 passive layer is proposed to decrease the propagation losses of the pump beam and in consequence to improve the microwave phase shift up to 36.5º at 25 GHz. Experimental results are reproduced by a theoretical model based on the slow light effect produced in a semiconductor waveguide due to the coherent population oscillations. The resulting device shows potential benefits respect to the current MPS technologies since it allows a fast tunability of the phase shift and a high level of integration due to its small size. 2015 Optical Society of America References and links1.

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Section: Introductionmentioning

confidence: 99%

MWP phase shifters integrated in PbS-SU8 waveguides

Hervás¹,

Suárez²,

Pérez³

et al. 2015

Opt. Express

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“…[5][6][7] This scheme is, however, relatively bulky and complex. Recently, both slow light effects 8 and microring resonators 9 have been exploited to achieve microwave time delays. In particular, slow light in active semiconductor waveguides can provide very fast tuning speed, compact size, and low power consumption.…”

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confidence: 99%

“…When the microwave frequency approaches the dip frequency of 43 GHz, the phase approaches 180 for the largest power level, which is the generic phase response if one considers the XGM response as a microwave notch filter profile. 9 At low microwave frequencies, because the length of the SOA is much smaller than the wavelength of the microwave modulation, propagation effects inside the SOA can be neglected. Hence, in the low-frequency range, the obtained time delay will be the same for the co-and counter-propagating configurations and is dominated by dynamical gain saturation effects.…”

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confidence: 99%

Tunable true-time delay of a microwave photonic signal realized by cross gain modulation in a semiconductor waveguide

Xue

Mørk

2011

Applied Physics Letters

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We experimentally demonstrate the realization of a tunable true-time delay for microwave signals by exploiting cross gain modulation among counter-propagating optical beams in a semiconductor optical amplifier. Broadband operation from ∼5 to ∼35 GHz is observed. The physical effect originates from the combination of carrier dynamics and propagation effects, and the experimental results are well accounted for by a numerical model. We find that, in contrast to the case of the co-propagating beams, the bandwidth is not limited by the lifetime of excited carriers. The trade-off between the magnitude of the true-time delay and the microwave bandwidth is discussed.

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“…As the MWP phase shifter is implemented based on a single microring configuration, the RF power variation due to the high extinction ratio of the microring filter can be minimized by reducing the loss of the microring and optimizing the coupling coefficient between the straight waveguide and racetrack waveguide [23]. Moreover, the use of cascaded microring resonators to implement phase shifting can also be adopted to enlarge the phase shifting range and present a more controllable RF power variation [24].…”

Section: Integrated Mwp Phase Shiftermentioning

confidence: 99%

Integrated Microwave Photonics for Wideband Signal Processing

Chew

Song

et al. 2017

Photonics

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Abstract:We describe recent progress in integrated microwave photonics in wideband signal processing applications with a focus on the key signal processing building blocks, the realization of monolithic integration, and cascaded photonic signal processing for analog radio frequency (RF) photonic links. New developments in integration-based microwave photonic techniques, that have high potentialities to be used in a variety of sensing applications for enhanced resolution and speed are also presented.

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Widely tunable microwave phase shifter based on silicon-on-insulator dual-microring resonator

Cited by 81 publications

References 16 publications

MWP phase shifters integrated in PbS-SU8 waveguides

MWP phase shifters integrated in PbS-SU8 waveguides

Tunable true-time delay of a microwave photonic signal realized by cross gain modulation in a semiconductor waveguide

Integrated Microwave Photonics for Wideband Signal Processing

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