Tailoring of the Brillouin gain for on-chip widely tunable and reconfigurable broadband microwave photonic filters

Choudhary, Amol; Aryanfar, Iman; Shahnia, Shayan; Morrison, Blair; Vu, Khu; Madden, Steve; Luther‐Davies, Barry; Marpaung, David; Eggleton, Benjamin J.

doi:10.1364/ol.41.000436

Cited by 125 publications

(74 citation statements)

References 26 publications

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“…2 RF tones were generated by an RF signal generator (Tabor, 400 MHz) separated by 20 MHz and were modulated onto the IM. The resultant broadened pump was used to increase the bandwidth of the SBS response and thus the filter 14, 39 . 23 ns pulses were generated from an RF signal Generator (Tabor, 1 GHz) and then up-converted from baseband by mixing with a 14.1 GHz RF tone using an RF mixer (Mini Circuits).…”

Section: Methodsmentioning

confidence: 99%

“…This has motivated the development of on-chip platforms 30, 31 for generating high SBS gains in silicon 32–34 and chalcogenides 35, 36 for various microwave photonic functionalities 37–43 . Nevertheless, in each of these cases the spectral resolution was mainly governed by the material properties, with the increase in the bandwidth possible through a cascade of pumps spaced at different frequencies 39 . In contrast, the reduction in the bandwidth is challenging and could only be achieved by increasing the pump power, negatively affecting the power-efficiency of the device 40 .…”

Section: Introductionmentioning

confidence: 99%

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High-resolution, on-chip RF photonic signal processor using Brillouin gain shaping and RF interference

Choudhary

Liu

Morrison

et al. 2017

Sci Rep

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Integrated microwave photonics has strongly emerged as a next-generation technology to address limitations of conventional RF electronics for wireless communications. High-resolution RF signal processing still remains a challenge due to limitations in technology that offer sub-GHz spectral resolution, in particular at high carrier frequencies. In this paper, we present an on-chip high-resolution RF signal processor, capable of providing high-suppression spectral filtering, large phase shifts and ns-scale time delays. This was achieved through tailoring of the Brillouin gain profiles using Stokes and anti-Stokes resonances combined with RF interferometry on a low-loss photonic chip with strong opto-acoustic interactions. Using an optical power of <40 mW, reconfigurable filters with a bandwidth of ~20 MHz and an extinction ratio in excess of 30 dB are synthesized. Through the concept of vector addition of RF signals we demonstrate, almost an order of magnitude amplification in the phase and delay compared to devices purely based upon the slow-light effect of Brillouin scattering. This concept allows for versatile and power-efficient manipulation of the amplitude and phase of RF signals on a photonic chip for applications in wireless communications including software defined radios and beam forming.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-resolution, on-chip RF photonic signal processor using Brillouin gain shaping and RF interference

Choudhary

Liu

Morrison

et al. 2017

Sci Rep

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“…On-chip stimulated Brillouin scattering (SBS) is another nonlinear effect that has been explored for implementing RF filters. Utilizing the SBS effect in a 6.5-cm-long As2S3 waveguide, Morrison et al [109], Byrnes et al [110], and Choudhary et al [111] demonstrated respectively an RF bandstop filter and narrow bandpass filter with tunable bandwidth and center frequency as shown in Figure 26B. In a later work Marpaung et al [44], associated such SBS effect with a particular modulation spectrum comprising uneven sidebands and therewith demonstrated a highly selective RF notch filter with a very deep notch of 60 dB and a large frequency tuning range of 30 GHz as shown in Figure 27A.…”

Section: Various Filter Implementationsmentioning

confidence: 99%

Programmable optical processor chips: toward photonic RF filters with DSP-level flexibility and MHz-band selectivity

et al. 2017

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Integrated optical signal processors have been identified as a powerful engine for optical processing of microwave signals. They enable wideband and stable signal processing operations on miniaturized chips with ultimate control precision. As a promising application, such processors enables photonic implementations of reconfigurable radio frequency (RF) filters with wide design flexibility, large bandwidth, and high-frequency selectivity. This is a key technology for photonic-assisted RF front ends that opens a path to overcoming the bandwidth limitation of current digital electronics. Here, the recent progress of integrated optical signal processors for implementing such RF filters is reviewed. We highlight the use of a low-loss, high-index-contrast stoichiometric silicon nitride waveguide which promises to serve as a practical material platform for realizing high-performance optical signal processors and points toward photonic RF filters with digital signal processing (DSP)-level flexibility, hundreds-GHz bandwidth, MHz-band frequency selectivity, and full system integration on a chip scale.

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“…This stimulated Brillouin scattering (SBS) approach is based on a single passband microwave photonic filter as described in Figure 9a [32]. The input RF signal is modulated onto an optical carrier using a phase modulator, such that two sidebands with a phase difference of π separated from the RF carrier frequency is resulted.…”

Section: Multiband Filter Based On Tailoring Of the Brillouin Gain Inmentioning

confidence: 99%

Tunable Multiband Microwave Photonic Filters

Fok

2017

Photonics

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Abstract:The increasing demand for multifunctional devices, the use of cognitive wireless technology to solve the frequency resource shortage problem, as well as the capabilities and operational flexibility necessary to meet ever-changing environment result in an urgent need of multiband wireless communications. Spectral filter is an essential part of any communication systems, and in the case of multiband wireless communications, tunable multiband RF filters are required for channel selection, noise/interference removal, and RF signal processing. Unfortunately, it is difficult for RF electronics to achieve both tunable and multiband spectral filtering. Recent advancements of microwave photonics have proven itself to be a promising candidate to solve various challenges in RF electronics including spectral filtering, however, the development of multiband microwave photonic filtering still faces lots of difficulties, due to the limited scalability and tunability of existing microwave photonic schemes. In this review paper, we first discuss the challenges that were facing by multiband microwave photonic filter, then we review recent techniques that have been developed to tackle the challenge and lead to promising developments of tunable microwave photonic multiband filters. The successful design and implementation of tunable microwave photonic multiband filter facilitate the vision of dynamic multiband wireless communications and radio frequency signal processing for commercial, defense, and civilian applications.

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Tailoring of the Brillouin gain for on-chip widely tunable and reconfigurable broadband microwave photonic filters

Cited by 125 publications

References 26 publications

High-resolution, on-chip RF photonic signal processor using Brillouin gain shaping and RF interference

High-resolution, on-chip RF photonic signal processor using Brillouin gain shaping and RF interference

Programmable optical processor chips: toward photonic RF filters with DSP-level flexibility and MHz-band selectivity

Tunable Multiband Microwave Photonic Filters

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