The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Stephen R Forrest - One of the best experts on this subject based on the ideXlab platform.
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Photonic Integration using asymmetric twin waveguide atg technology part i concepts and theory
IEEE Journal of Selected Topics in Quantum Electronics, 2005Co-Authors: Vinod M Menon, Stephen R ForrestAbstract:In this first of two papers (hereinafter called Paper I), we present a universal approach for simply realizing monolithic Photonic Integration based on asymmetric twin-waveguide (ATG) technology. The concepts and important developments leading to ATG Integration technology will be reviewed. The ATG structure consists of active and/or passive devices formed in separate, vertically displaced waveguides. Light is transferred between the waveguides via very low loss, lateral, adiabatic tapered mode transformers, allowing different optical functions to be realized in the different waveguides. The design of the adiabatic tapered mode transformer uses an algorithm based on perturbation theory. We show that the same designs can also be deduced from coupled local mode theory. Using the perturbation algorithm to design the taper coupler in an ATG based high bandwidth photodiode, a transfer efficiency of greater than 90% from the fiber waveguide to the coupling waveguide is achieved while the taper length can be reduced by 35% compared to conventional two-section linear taper couplers. The taper design algorithm is further optimized to make the adiabatic taper couplers tolerant to variations in incident light polarization, operation wavelength, and dimensional control during fabrication. Finally, we propose and design a taper that adiabatically couples light from the fundamental mode to the first-order mode. Such a taper coupler is useful in an integrated semiconductor optical amplifier/p-i-n detector circuit.
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Photonic Integration using asymmetric twin waveguide atg technology part ii devices
IEEE Journal of Selected Topics in Quantum Electronics, 2005Co-Authors: Vinod M Menon, Fengnian Xia, Stephen R ForrestAbstract:Asymmetric twin-waveguide (ATG) technology has been shown to be a versatile and high-performance platform for the Integration of a wide range of Photonic integrated circuits. Following the conceptual and theoretical description in the preceding paper, here we discuss several archetype ATG-based Photonic integrated devices and circuits. We present results on the three basic device classes that span the entire range of Photonic component needs: light emitters, detectors, and light transporting devices (e.g., waveguides) that have been realized using the twin waveguide platform. Specifically, we discuss Fabry-Pe/spl acute/rot and wavelength-tunable lasers, high-bandwidth p-i-n photodiodes, a polarization-insensitive arrayed waveguide grating receiver with integrated p-i-n photodiodes, as well as combinations of functions including integrated electroabsorption-modulated lasers, and a semiconductor optical amplifier integrated with a p-i-n photodiode. Finally, we address potential Integration challenges and novel applications of the ATG scheme, and avenues for improvement.
J F Donegan - One of the best experts on this subject based on the ideXlab platform.
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single mode lasers based on slots suitable for Photonic Integration
Optics Express, 2011Co-Authors: Weihua Guo, Marta Nawrocka, Azat Abdullaev, C L M Daunt, James Ocallaghan, M Lynch, V Weldon, Frank H Peters, J F DoneganAbstract:The re-growth free single mode lasers based on etched slots suitable for Photonic Integration are presented in this paper. The fabricated 650μm long laser exhibits a threshold current and a slope efficiency of about 32mA and 0.12mW/mA, respectively. The stable single mode operation has been observed with a side mode suppression ratio (SMSR) over 50dB at a current injection of 100mA for the fabricated laser. Such a laser integrated with electroabsorption (EA) modulator is also demonstrated. The integrated device has an extinction ratio over 10 dB at 2.2V driving voltage with the lasing wavelength of around 20nm positive detuning relative to the gain peak. The bandwidth measured is about 3GHz for the integrated device.
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design of slotted single mode lasers suitable for Photonic Integration
IEEE Photonics Technology Letters, 2010Co-Authors: Weihua Guo, Diarmuid Byrne, J F DoneganAbstract:A single-mode laser structure suitable for Photonic Integration is presented. The laser can be fabricated by standard photolithography without any regrowth steps. Through optimization, a threshold current as low as 13 mA and a sidemode suppression ratio (SMSR) up to 47 dB have been predicted for a 400-?m-long laser. A high yield up to 90% is also predicted with the requirement that the SMSR is higher than 40 dB at an injection current of 100 mA.
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discretely tunable semiconductor lasers suitable for Photonic Integration
IEEE Journal of Selected Topics in Quantum Electronics, 2009Co-Authors: Diarmuid Byrne, James Ocallaghan, Frank H Peters, J P Engelstaedter, Qiao Yin Lu, Brian Corbett, B Roycroft, J F DoneganAbstract:A sequence of partially reflective slots etched into an active ridge waveguide of a 1.5 mum laser structure is found to provide sufficient reflection for lasing. Mirrors based on these reflectors have strong spectral dependence. Two such active mirrors together with an active central section are combined in a Vernier configuration to demonstrate a tunable laser exhibiting 11 discrete modes over a 30 nm tuning range with mode spacing around 400 GHz and side-mode suppression ratio larger than 30 dB. The individual modes can be continuously tuned by up to 1.1 nm by carrier injection and by over 2 nm using thermal effects. These mirrors are suitable as a platform for Integration of other optical functions with the laser. This is demonstrated by monolithically integrating a semiconductor optical amplifier with the laser resulting in a maximum channel power of 14.2 dBm from the discrete modes.
Vinod M Menon - One of the best experts on this subject based on the ideXlab platform.
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Photonic Integration using asymmetric twin waveguide atg technology part i concepts and theory
IEEE Journal of Selected Topics in Quantum Electronics, 2005Co-Authors: Vinod M Menon, Stephen R ForrestAbstract:In this first of two papers (hereinafter called Paper I), we present a universal approach for simply realizing monolithic Photonic Integration based on asymmetric twin-waveguide (ATG) technology. The concepts and important developments leading to ATG Integration technology will be reviewed. The ATG structure consists of active and/or passive devices formed in separate, vertically displaced waveguides. Light is transferred between the waveguides via very low loss, lateral, adiabatic tapered mode transformers, allowing different optical functions to be realized in the different waveguides. The design of the adiabatic tapered mode transformer uses an algorithm based on perturbation theory. We show that the same designs can also be deduced from coupled local mode theory. Using the perturbation algorithm to design the taper coupler in an ATG based high bandwidth photodiode, a transfer efficiency of greater than 90% from the fiber waveguide to the coupling waveguide is achieved while the taper length can be reduced by 35% compared to conventional two-section linear taper couplers. The taper design algorithm is further optimized to make the adiabatic taper couplers tolerant to variations in incident light polarization, operation wavelength, and dimensional control during fabrication. Finally, we propose and design a taper that adiabatically couples light from the fundamental mode to the first-order mode. Such a taper coupler is useful in an integrated semiconductor optical amplifier/p-i-n detector circuit.
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Photonic Integration using asymmetric twin waveguide atg technology part ii devices
IEEE Journal of Selected Topics in Quantum Electronics, 2005Co-Authors: Vinod M Menon, Fengnian Xia, Stephen R ForrestAbstract:Asymmetric twin-waveguide (ATG) technology has been shown to be a versatile and high-performance platform for the Integration of a wide range of Photonic integrated circuits. Following the conceptual and theoretical description in the preceding paper, here we discuss several archetype ATG-based Photonic integrated devices and circuits. We present results on the three basic device classes that span the entire range of Photonic component needs: light emitters, detectors, and light transporting devices (e.g., waveguides) that have been realized using the twin waveguide platform. Specifically, we discuss Fabry-Pe/spl acute/rot and wavelength-tunable lasers, high-bandwidth p-i-n photodiodes, a polarization-insensitive arrayed waveguide grating receiver with integrated p-i-n photodiodes, as well as combinations of functions including integrated electroabsorption-modulated lasers, and a semiconductor optical amplifier integrated with a p-i-n photodiode. Finally, we address potential Integration challenges and novel applications of the ATG scheme, and avenues for improvement.
Benjamin J Eggleton - 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.
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.
