The Experts below are selected from a list of 5448 Experts worldwide ranked by ideXlab platform
Benjamin J Eggleton - One of the best experts on this subject based on the ideXlab platform.
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suspended mid infrared waveguides for Stimulated Brillouin Scattering
arXiv: Optics, 2018Co-Authors: Mikolaj K Schmidt, Benjamin J Eggleton, Christopher G Poulton, G Z Mashanovich, G T Reed, Mj SteelAbstract:We theoretically investigate a new class of silicon waveguides for achieving Stimulated Brillouin Scattering (SBS) in the mid-infrared (MIR). The waveguide consists of a rectangular core supporting a low-loss optical mode, suspended in air by a series of transverse ribs. The ribs are patterned to form a finite quasi-one-dimensional phononic crystal, with the complete stopband suppressing the transverse leakage of acoustic waves, and confining them to the core of the waveguide. We derive a theoretical formalism that can be used to compute the opto-acoustic interaction in such periodic structures, and find forward intramodal-SBS gains up to $1750~\text{m}^{-1}\text{W}^{-1}$, which compares favorably with the proposed MIR SBS designs based on buried germanium waveguides. This large gain is achieved thanks to the nearly complete suppression of acoustic radiative losses.
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tunable narrowband microwave photonic filter created by Stimulated Brillouin Scattering from a silicon nanowire
Optics Letters, 2015Co-Authors: Alvaro Casasbedoya, Blair Morrison, David Marpaung, Mattia Pagani, Benjamin J EggletonAbstract:We demonstrate the first, to the best of our knowledge, functional signal processing device based on Stimulated Brillouin Scattering in a silicon nanowire. We use only 1 dB of on-chip Stimulated Brillouin Scattering gain to create an RF photonic notch filter with 48 dB of suppression, 98 MHz linewidth, and 6 GHz frequency tuning. This device has potential applications in on-chip microwave signal processing and establishes the foundation for the first CMOS-compatible high-performance RF photonic filter.
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tunable narrowband microwave photonic filter created by Stimulated Brillouin Scattering from a silicon nanowire
arXiv: Optics, 2015Co-Authors: Alvaro Casasbedoya, Blair Morrison, David Marpaung, Mattia Pagani, Benjamin J EggletonAbstract:We demonstrate the first functional signal processing device based on Stimulated Brillouin Scattering in a silicon nanowire. We use only 1 dB of on-chip SBS gain to create an RF photonic notch filter with 48 dB of suppression, 98 MHz linewidth, and 6 GHz frequency tuning. This device has potential applications in on-chip microwave signal processing and establishes the foundation for the first CMOS-compatible high performance RF photonic filter.
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tunable microwave photonic phase shifter using on chip Stimulated Brillouin Scattering
Conference on Lasers and Electro-Optics, 2015Co-Authors: Mattia Pagani, David Marpaung, Duk-yong Choi, Steve Madden, Barry Lutherdavies, Benjamin J EggletonAbstract:We present the first microwave photonic phase shifter using on-chip Stimulated Brillouin Scattering. We show that shorter integrated platforms can potentially achieve lower insertion loss than fiber implementations, due to their higher pump depletion threshold.
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enhancing and inhibiting Stimulated Brillouin Scattering in photonic integrated circuits
Nature Communications, 2015Co-Authors: Moritz Merklein, Irina V Kabakova, Duk-yong Choi, Thomas F S Buttner, Barry Lutherdavies, Stephen J Madden, Benjamin J EggletonAbstract:On-chip nonlinear optics is a thriving research field, which creates transformative opportunities for manipulating classical or quantum signals in small-footprint integrated devices. Since the length scales are short, nonlinear interactions need to be enhanced by exploiting materials with large nonlinearity in combination with high-Q resonators or slow-light structures. This, however, often results in simultaneous enhancement of competing nonlinear processes, which limit the efficiency and can cause signal distortion. Here, we exploit the frequency dependence of the optical density-of-states near the edge of a photonic bandgap to selectively enhance or inhibit nonlinear interactions on a chip. We demonstrate this concept for one of the strongest nonlinear effects, Stimulated Brillouin Scattering using a narrow-band one-dimensional photonic bandgap structure: a Bragg grating. The Stimulated Brillouin Scattering enhancement enables the generation of a 15-line Brillouin frequency comb. In the inhibition case, we achieve Stimulated Brillouin Scattering free operation at a power level twice the threshold.
M A Mahdi - One of the best experts on this subject based on the ideXlab platform.
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analytical study of nonlinear phase shift through Stimulated Brillouin Scattering in single mode fiber with the pump power recycling technique
Journal of Optics, 2011Co-Authors: Hamid Ali Abed Alasadi, F Mahamd R Adikan, Ahmad Ashrif A Bakar, M A MahdiAbstract:We present a theoretical study of nonlinear phase shift through Stimulated Brillouin Scattering in single mode optical fiber. Analytical expressions describing the nonlinear phase shift for the pump and Stokes waves in the pump power recycling technique have been derived. The dependence of the nonlinear phase shift on the optical fiber length, the reflectivity of the optical mirror and the frequency detuning coefficient have been analyzed for different input pump power values. We found that with the recycling pump technique, the nonlinear phase shift due to Stimulated Brillouin Scattering reduced to less than 0.1 rad for 5 km optical fiber length and 0.65 reflectivity of the optical mirror, respectively, at an input pump power equal to 30 mW.
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analytical study of nonlinear phase shift through Stimulated Brillouin Scattering in single mode fibre with pump power recycling technique
Social Science Research Network, 2011Co-Authors: Hamid Ali Abed Alasadi, Ahmad Ashrif A Bakar, F R Mahamd, M A MahdiAbstract:We present a theoretical study of nonlinear phase shift through Stimulated Brillouin Scattering in single mode optical fiber. Analytical expressions describing the nonlinear phase shift for the pump and Stokes waves in the pump power recycling technique have been derived. The dependence of the nonlinear phase shift on the optical fiber length, the reflectivity of the optical mirror and the frequency detuning coefficient have been analyzed for different input pump power values. We found that with the recycling pump technique, the nonlinear phase shift due to Stimulated Brillouin Scattering reduced to less than 0.1 rad for 5 km optical fiber length and 0.65 reflectivity of the optical mirror, respectively, at an input pump power equal to 30 mW.
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reduction of Stimulated Brillouin Scattering threshold through pump recycling technique
Laser Physics Letters, 2009Co-Authors: M Ajiya, M A Mahdi, M H Almansoori, S Hitam, Y G Shee, M MokhtarAbstract:We demonstrate a simple method of Stimulated Brillouin Scattering (SBS) threshold reduction through a procedure of Brillouin pump recycling technique. High reflectivity optical mirror was incorporated onto our experimental structure in order to recycle the forward transmitted Brillouin pump signal back into the Brillouin gain medium thereby increasing its effective gain. In a 5.0 km single mode fiber spool, our technique reduced SBS threshold by over 48% (measured at 8.5 mW of input signal against 16.5 mW in the conventional technique under same input signal conditions). In addition, the Stokes power was amplified to 9.2 dBm by our method against 4.3 dBm measured in the conventional technique in the 5.0 km single mode fiber spool. Result of different lengths has proved that our technique considerably reduced SBS threshold compared to the conventional method of SBS characterization under same pumping schemes.
Christopher G Poulton - One of the best experts on this subject based on the ideXlab platform.
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picosecond acoustic dynamics in Stimulated Brillouin Scattering
Optics Letters, 2021Co-Authors: Johannes Piotrowski, Christopher G Poulton, Mikolaj K Schmidt, Birgit Stiller, Mj SteelAbstract:Recent experiments demonstrating storage of optical pulses in acoustic phonons via Stimulated Brillouin Scattering raise questions about the spectral and temporal capacities of such protocols and the limitations of the theoretical frameworks routinely used to describe them. We consider the dynamics of photon–phonon Scattering induced by optical pulses with temporal widths comparable to the period of acoustic oscillations. We revisit the widely adopted classical formalism of coupled modes and demonstrate its breakdown. We use a simple extension to the formulation and find potentially measurable consequences in the dynamics of Brillouin experiments involving ultrashort pulses.
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picosecond acoustic dynamics in Stimulated Brillouin Scattering
arXiv: Optics, 2021Co-Authors: Johannes Piotrowski, Christopher G Poulton, Mikolaj K Schmidt, Birgit Stiller, Mj SteelAbstract:Recent experiments demonstrating storage of optical pulses in acoustic phonons based on Stimulated Brillouin Scattering raise a number of questions about the spectral and temporal capacities of such protocols and the limitations of the theoretical frameworks routinely used to describe them. In this work, we consider the dynamics of photon-phonon Scattering induced by optical pulses with temporal widths comparable to the period of acoustic oscillations. We revisit the widely adopted classical formalism of coupled modes and demonstrate its breakdown. We propose a simple extension to generalise the formulation and find potentially measurable consequences in the dynamics of Brillouin experiments involving ultra-short pulses.
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suspended mid infrared waveguides for Stimulated Brillouin Scattering
arXiv: Optics, 2018Co-Authors: Mikolaj K Schmidt, Benjamin J Eggleton, Christopher G Poulton, G Z Mashanovich, G T Reed, Mj SteelAbstract:We theoretically investigate a new class of silicon waveguides for achieving Stimulated Brillouin Scattering (SBS) in the mid-infrared (MIR). The waveguide consists of a rectangular core supporting a low-loss optical mode, suspended in air by a series of transverse ribs. The ribs are patterned to form a finite quasi-one-dimensional phononic crystal, with the complete stopband suppressing the transverse leakage of acoustic waves, and confining them to the core of the waveguide. We derive a theoretical formalism that can be used to compute the opto-acoustic interaction in such periodic structures, and find forward intramodal-SBS gains up to $1750~\text{m}^{-1}\text{W}^{-1}$, which compares favorably with the proposed MIR SBS designs based on buried germanium waveguides. This large gain is achieved thanks to the nearly complete suppression of acoustic radiative losses.
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on chip Stimulated Brillouin Scattering for microwave signal processing and generation
Laser & Photonics Reviews, 2014Co-Authors: Ravi Pant, Blair Morrison, David Marpaung, Irina V Kabakova, Christopher G Poulton, Benjamin J EggletonAbstract:Demonstration of continuously tunable delay, low- noise lasers, dynamically controlled gratings, and optical phase shifting using the Stimulated Brillouin Scattering (SBS) process has lead to the emergence of SBS as a promising technology for microwave photonics. On-chip realization of SBS enables photonic integration of microwave photonic signal processing and offers significantly enhanced performance and improved efficiency. On-chip Stimulated Brillouin Scattering is reviewed in the context of slow-light based tunable delay, low-noise narrow linewidth lasers and filtering for integrated microwave photonics. A discussion on key material and device properties, necessary to enable on-chip Brillouin Scattering using both the single-pass and resonator geometry, is presented along with an outlook for photonic integration of microwave signal processing and gener- ation in other platforms.
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inducing and harnessing Stimulated Brillouin Scattering in photonic integrated circuits
Advances in Optics and Photonics, 2013Co-Authors: Benjamin J Eggleton, Christopher G Poulton, Ravi PantAbstract:We review recent progress in inducing and harnessing Stimulated Brillouin Scattering (SBS) in integrated photonic circuits. Exciting SBS in a chip-scale device is challenging due to the stringent requirements on materials and device geometry. We discuss these requirements, which include material parameters, such as optical refractive index and acoustic velocity, and device properties, such as acousto-optic confinement. Recent work on SBS in nano-photonic waveguides and micro-resonators is presented, with special attention paid to photonic integration of applications such as narrow-linewidth lasers, slow- and fast-light, microwave signal processing, Brillouin dynamic gratings, and nonreciprocal devices.
Hamid Ali Abed Alasadi - One of the best experts on this subject based on the ideXlab platform.
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analytical study of nonlinear phase shift through Stimulated Brillouin Scattering in single mode fiber with the pump power recycling technique
Journal of Optics, 2011Co-Authors: Hamid Ali Abed Alasadi, F Mahamd R Adikan, Ahmad Ashrif A Bakar, M A MahdiAbstract:We present a theoretical study of nonlinear phase shift through Stimulated Brillouin Scattering in single mode optical fiber. Analytical expressions describing the nonlinear phase shift for the pump and Stokes waves in the pump power recycling technique have been derived. The dependence of the nonlinear phase shift on the optical fiber length, the reflectivity of the optical mirror and the frequency detuning coefficient have been analyzed for different input pump power values. We found that with the recycling pump technique, the nonlinear phase shift due to Stimulated Brillouin Scattering reduced to less than 0.1 rad for 5 km optical fiber length and 0.65 reflectivity of the optical mirror, respectively, at an input pump power equal to 30 mW.
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analytical study of nonlinear phase shift through Stimulated Brillouin Scattering in single mode fibre with pump power recycling technique
Social Science Research Network, 2011Co-Authors: Hamid Ali Abed Alasadi, Ahmad Ashrif A Bakar, F R Mahamd, M A MahdiAbstract:We present a theoretical study of nonlinear phase shift through Stimulated Brillouin Scattering in single mode optical fiber. Analytical expressions describing the nonlinear phase shift for the pump and Stokes waves in the pump power recycling technique have been derived. The dependence of the nonlinear phase shift on the optical fiber length, the reflectivity of the optical mirror and the frequency detuning coefficient have been analyzed for different input pump power values. We found that with the recycling pump technique, the nonlinear phase shift due to Stimulated Brillouin Scattering reduced to less than 0.1 rad for 5 km optical fiber length and 0.65 reflectivity of the optical mirror, respectively, at an input pump power equal to 30 mW.
Ravi Pant - One of the best experts on this subject based on the ideXlab platform.
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on chip Stimulated Brillouin Scattering for microwave signal processing and generation
Laser & Photonics Reviews, 2014Co-Authors: Ravi Pant, Blair Morrison, David Marpaung, Irina V Kabakova, Christopher G Poulton, Benjamin J EggletonAbstract:Demonstration of continuously tunable delay, low- noise lasers, dynamically controlled gratings, and optical phase shifting using the Stimulated Brillouin Scattering (SBS) process has lead to the emergence of SBS as a promising technology for microwave photonics. On-chip realization of SBS enables photonic integration of microwave photonic signal processing and offers significantly enhanced performance and improved efficiency. On-chip Stimulated Brillouin Scattering is reviewed in the context of slow-light based tunable delay, low-noise narrow linewidth lasers and filtering for integrated microwave photonics. A discussion on key material and device properties, necessary to enable on-chip Brillouin Scattering using both the single-pass and resonator geometry, is presented along with an outlook for photonic integration of microwave signal processing and gener- ation in other platforms.
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inducing and harnessing Stimulated Brillouin Scattering in photonic integrated circuits
Advances in Optics and Photonics, 2013Co-Authors: Benjamin J Eggleton, Christopher G Poulton, Ravi PantAbstract:We review recent progress in inducing and harnessing Stimulated Brillouin Scattering (SBS) in integrated photonic circuits. Exciting SBS in a chip-scale device is challenging due to the stringent requirements on materials and device geometry. We discuss these requirements, which include material parameters, such as optical refractive index and acoustic velocity, and device properties, such as acousto-optic confinement. Recent work on SBS in nano-photonic waveguides and micro-resonators is presented, with special attention paid to photonic integration of applications such as narrow-linewidth lasers, slow- and fast-light, microwave signal processing, Brillouin dynamic gratings, and nonreciprocal devices.
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photonic chip based tunable slow and fast light via Stimulated Brillouin Scattering
Conference on Lasers and Electro-Optics, 2012Co-Authors: Ravi Pant, Christopher G Poulton, Duk-yong Choi, Steve Madden, Barry Lutherdavies, Adam Byrnes, Benjamin J EggletonAbstract:We report the first demonstration of on-chip tunable slow- and fast-light via Stimulated Brillouin Scattering. We observe group-index ranging from ∼-44 to +130 in a 7cm long chalcogenide waveguide at a low gain of ∼23dB.
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On-chip Stimulated Brillouin Scattering
Optics Express, 2011Co-Authors: Ravi Pant, Luc Thévenaz, Christopher G Poulton, Duk-yong Choi, Steve Madden, Barry Luther-davies, Hannah Mcfarlane, Benjamin J EggletonAbstract:We report the first demonstration of on-chip Stimulated Brillouin Scattering (SBS) with low average power. The measured Brillouin shift and line width are ∼7.7 GHz and ∼6 MHz in a 7 cm long chalcogenide waveguide.
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On-chip Stimulated Brillouin Scattering
2011Co-Authors: Ravi Pant, Luc Thévenaz, Christopher G Poulton, Duk-yong Choi, Steve Madden, Barry Luther-davies, Hannah Macfarlane, Benjamin J EggletonAbstract:We report the first demonstration of on-chip Stimulated Brillouin Scattering (SBS). The measured Brillouin shift and line width are 7.7 GHz and 6 MHz in a 7 cm long chalcogenide waveguide.
