Brillouin-based phase shifter in a silicon waveguide

McKay, Luke; Merklein, Moritz; Casas-Bedoya, Alvaro; Choudhary, Amol; Jenkins, Micah; Middleton, Charles; Cramer, Alex; Devenport, Joseph; Klee, Anthony; DeSalvo, Richard; Eggleton, Benjamin J.

doi:10.1364/optica.6.000907

Cited by 39 publications

(17 citation statements)

References 44 publications

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“…To play a key role in real RF applications, integrated MWP circuits need to simultaneously show advanced programmability and exceptional performance in terms of losses, noise figure, and dynamic range in a reduced footprint [3][4][5][6][7]. In recent pasts, a number of integrated MWP functions have widely been demonstrated, such as for filtering [8][9][10][11][12], phase shifting [13][14][15][16][17], delay line [18][19][20][21], waveform generator [22][23][24][25][26][27] and beamforming [28][29][30][31]. Typically, these functions were achieved in dedicated, or application specific circuits, and the measured RF metrics were only sparsely reported.…”

Section: Introductionmentioning

confidence: 99%

Ultrahigh Dynamic Range and Low Noise Figure Programmable Integrated Microwave Photonic Filter

Daulay¹,

Liu²,

Ye³

et al. 2022

Preprint

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Microwave photonics (MWP) has adopted a number of important concepts and technologies over the recent pasts, including photonic integration, versatile programmability, and techniques for enhancing key radio frequency performance metrics such as the noise figure and the dynamic range. However, to date, these aspects have not been achieved simultaneously in a single circuit. Here, we demonstrate, for the first time, a multi-functional integrated microwave photonic circuit that enables on-chip programmable filtering functions while achieving record-high key radio frequency metrics of >120 dB.Hz dynamic range and 15 dB of noise figure that are previously unreachable. We unlock this unique feature by versatile complex spectrum tailoring using an all integrated modulation transformer and a double injection ring resonator as a multi-function optical filtering component. This work breaks the conventional and fragmented approach of integration, functionality and performance that currently prevents the adoption of integrated MWP systems in real applications.

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Section: Introductionmentioning

confidence: 99%

Ultrahigh Dynamic Range and Low Noise Figure Programmable Integrated Microwave Photonic Filter

Daulay¹,

Liu²,

Ye³

et al. 2022

Preprint

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“…However, a large amount of Brillouin gain is required to achieve 360°phase shifts, limiting practical usage in chip-based devices due to gain limitations, power handling of the chip and power consumption. Recently, a Brillouin-based phase shifter was demonstrated in a silicon waveguide using only 1.6 dB of forward Brillouin gain, enabled by an interferometric broadband phase enhancement scheme over a bandwidth of 15 GHz [25]. Forward Brillouin scattering requires the optical pump to co-propagate with the probe.…”

Section: Introductionmentioning

confidence: 99%

“…Due to the relatively large difference in the amplitude between these components, this presents a challenge to sufficiently filter out the pump before the photodetector, which can cause distortion. This difficulty in filtering the pump is compounded by the relatively small Brillouin frequency shift in silicon which is less than 4.5 GHz, so a high roll-off filter is required [25], [26].…”

Section: Introductionmentioning

confidence: 99%

Broadband Brillouin Phase Shifter Utilizing RF Interference: Experimental Demonstration and Theoretical Analysis

McKay

Merklein

Choudhary

et al. 2020

J. Lightwave Technol.

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Microwave photonic phase shifters based on stimulated Brillouin scattering (SBS) offer tunable and broadband, optically controllable phase shifts. However, achieving a 360°phase shift requires a large amount of SBS gain which often exceeds the available gain and power handling capability of an integrated waveguide. A Radio Frequency (RF) interference technique has recently been utilized in an integrated silicon platform, which uses forward Brillouin scattering in a suspended waveguide to compensate for the lack of available Brillouin gain in standard silicon on insulator platforms. This interference scheme amplifies the phase shift at the expense of link performance. Here, we demonstrate and analytically model a 360°ultra-broadband phase shifter using backward SBS in both fiber and on-chip by combining SBS and RF interference. The phase enhancement scheme greatly reduces the required Brillouin gain and thus the required optical power. Additionally, the backward architecture reduces filter requirements as the residual pump reflections are simpler to remove compared to the pump in the forward Brillouin scattering case, where the pump co-propagates with the signal. The model provides a deeper insight into the properties of the interferometric phase enhancement scheme and predicts the potential trade-offs of an optimized system, showing reduced link loss at higher levels of Brillouin gain. The model also predicts the sensitivity to variations

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“…Recently, there have been remarkable research interests and efforts to the on-chip SBS, largely driven by the increasing maturity of the material and nanophotonic technologies. , Harnessing and controlling SBS in these micro- and nanoscale integrated systems open the door to numerous on-chip applications including microwave signal synthesis and processing, − integrated Brillouin lasers, − optical gyroscope, optomechanical cooling, , and nonreciprocal optical devices. − According to the device structure, on-chip SBS devices can be classified as whispering gallery mode (WGM) resonators and planar integrated optical waveguides. Although silica ,− and fluoride-based WGM resonators possess ultrahigh quality factor and resonantly enhanced Brillouin interactions, their fabrication process is not compatible with the mature complementary metal-oxide-semiconductor (CMOS) technologies.…”

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confidence: 99%

Demonstration of Forward Brillouin Gain in a Hybrid Photonic–Phononic Silicon Waveguide

et al. 2021

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Silicon-based stimulated Brillouin scattering (SBS) promotes the on-chip all-optical signal processing network by interfacing silicon photonic and phononic technologies. Controllable and strong Brillouin coupling in silicon is a key requirement for this purpose. Here, we demonstrate traveling-wave forward SBS and Brillouin gain through a class of hybrid photonic-phononic silicon waveguides on the silicon-on-insulator (SOI) platform. This design combines the advantages of a silicon ridge waveguide and phononic crystal slab, allowing the independent control on the confined optical and acoustic modes. The strong and tailorable Brillouin nonlinearity is demonstrated via the heterodyne four-wave mixing spectroscopy. Three-tone gain experiment reveals a small-signal Stokes gain of 0.9 dB in a 1.085 cm length straight waveguide device at moderate pump power. The limiting factors and further improvements of net Brillouin amplification in our system are also discussed. This design can also be applied to the intermodal SBS as well as other silicon-based material platforms, and thus it offers the pathway toward on-chip microwave photonic filters, Brillouin amplifiers, and nonreciprocal devices.

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Brillouin-based phase shifter in a silicon waveguide

Cited by 39 publications

References 44 publications

Ultrahigh Dynamic Range and Low Noise Figure Programmable Integrated Microwave Photonic Filter

Ultrahigh Dynamic Range and Low Noise Figure Programmable Integrated Microwave Photonic Filter

Broadband Brillouin Phase Shifter Utilizing RF Interference: Experimental Demonstration and Theoretical Analysis

Demonstration of Forward Brillouin Gain in a Hybrid Photonic–Phononic Silicon Waveguide

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