On-chip multi-stage optical delay based on cascaded Brillouin light storage

Stiller, Birgit; Merklein, Moritz; Wolff, Christian; Vu, Khu; Ma, Pan; Poulton, Christopher G.; Madden, Steve; Eggleton, Benjamin J.

doi:10.1364/ol.43.004321

Cited by 12 publications

(6 citation statements)

References 27 publications

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“…• Traveling photonic pulses can be converted into traveling phononic pulses in a bandwidth far exceeding the mechanical linewidth. This is often called Brillouin light storage [114][115][116][117]. The traveling optical pump and signal pulses may counterpropagate or occupy different optical modes.…”

Section: A Interactions Between Phonons and Optical Photonsmentioning

confidence: 99%

Controlling phonons and photons at the wavelength scale: integrated photonics meets integrated phononics

Safavi-Naeini

Thourhout

Baets

et al. 2019

Optica

175

167

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Radio-frequency communication systems have long used bulk-and surface-acoustic-wave devices supporting ultrasonic mechanical waves to manipulate and sense signals. These devices have greatly improved our ability to process microwaves by interfacing them to orders-ofmagnitude slower and lower loss mechanical fields. In parallel, long-distance communications have been dominated by low-loss infrared optical photons. As electrical signal processing and transmission approaches physical limits imposed by energy dissipation, optical links are now being actively considered for mobile and cloud technologies. Thus there is a strong driver for wavelength-scale mechanical wave or "phononic" circuitry fabricated by scalable semiconductor processes. With the advent of these circuits, new micro-and nanostructures that combine electrical, optical and mechanical elements have emerged. In these devices, such as optomechanical waveguides and resonators, optical photons and gigahertz phonons are ideally matched to one another as both have wavelengths on the order of micrometers. The development of phononic circuits has thus emerged as a vibrant field of research pursued for optical signal processing and sensing applications as well as emerging quantum technologies. In this review, we discuss the key physics and figures of merit underpinning this field. We also summarize the state of the art in nanoscale electro-and optomechanical systems with a focus on scalable platforms such as silicon. Finally, we give perspectives on what these new systems may bring and what challenges they face in the coming years. In particular, we believe hybrid electro-and optomechanical devices incorporating highly coherent and compact mechanical elements on a chip have significant untapped potential for electro-optic modulation, quantum microwave-tooptical photon conversion, sensing and microwave signal processing.

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Section: A Interactions Between Phonons and Optical Photonsmentioning

confidence: 99%

Controlling phonons and photons at the wavelength scale: integrated photonics meets integrated phononics

Safavi-Naeini

Thourhout

Baets

et al. 2019

Optica

175

167

View full text Add to dashboard Cite

show abstract

“…Hence, OREO does not rely on complicated manufacturing processes of microstructures. It functions in any optical waveguide, including on-chip devices, as it harvests the physical property of a sound wave 25 – 27 . With the announcement of the first on-chip EDFA 28 a fully integrated design is in reach.…”

Section: Introductionmentioning

confidence: 99%

An optoacoustic field-programmable perceptron for recurrent neural networks

Becker,

Englund,

Stiller

2024

Nat Commun

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Recurrent neural networks (RNNs) can process contextual information such as time series signals and language. But their tracking of internal states is a limiting factor, motivating research on analog implementations in photonics. While photonic unidirectional feedforward neural networks (NNs) have demonstrated big leaps, bi-directional optical RNNs present a challenge: the need for a short-term memory that (i) programmable and coherently computes optical inputs, (ii) minimizes added noise, and (iii) allows scalability. Here, we experimentally demonstrate an optoacoustic recurrent operator (OREO) which meets (i, ii, iii). OREO contextualizes the information of an optical pulse sequence via acoustic waves. The acoustic waves link different optical pulses, capturing their information and using it to manipulate subsequent operations. OREO’s all-optical control on a pulse-by-pulse basis offers simple reconfigurability and is used to implement a recurrent drop-out and pattern recognition of 27 optical pulse patterns. Finally, we introduce OREO as bi-directional perceptron for new classes of optical NNs.

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“…[20], the ability to store and retrieve coherent informtation were demonstrated. Further work showed the non-reciprocity and cascading of the process [22,23], as well as dynamic reinforcement of the acoustic waves [24]. However, so far experiments in BBM (as well as in many other Brillouin phenomena), have been limited to nanosecond-long optical pulses [25].…”

Section: Introductionmentioning

confidence: 99%

Brillouin light storage for 100 pulse widths

Stiller,

Jaksch,

Piotrowski

et al. 2023

Preprint

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Signal processing based on stimulated Brillouin scattering (SBS) is limited by the narrow linewidth of the optoacoustic response, which confines many Brillouin applications to continuous wave signals or optical pulses longer than several nanoseconds. In this work, we experimentally demonstrate Brillouin interactions at the 150 ps time scale and a delay for a record 15 ns which corresponds to a delay of 100 pulse widths. This breakthrough experimental result was enabled by the high local gain of the chalcogenide waveguides as the optoacoustic interaction length reduces with pulse width. We successfully transfer 150ps-long pulses to traveling acoustic waves within a Brillouin-based memory setup. The information encoded in the optical pulses is stored for 15 ns in the acoustic field. We show the retrieval of eight amplitude levels, multiple consecutive pulses and low distortion in pulse shape. The extension of Brillouin-based storage to the ultra-short pulse regime is an important step for the realisation of practical Brillouin-based delay lines and other optical processing applications.

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On-chip multi-stage optical delay based on cascaded Brillouin light storage

Cited by 12 publications

References 27 publications

Controlling phonons and photons at the wavelength scale: integrated photonics meets integrated phononics

Controlling phonons and photons at the wavelength scale: integrated photonics meets integrated phononics

An optoacoustic field-programmable perceptron for recurrent neural networks

Brillouin light storage for 100 pulse widths

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