L. Chrostowski | University of British Columbia (original) (raw)
Papers by L. Chrostowski
Electronics Letters, 2013
We demonstrate the first room-temperature operation of a transistor vertical-cavity surface-emitt... more We demonstrate the first room-temperature operation of a transistor vertical-cavity surface-emitting laser (T-VCSEL). Fabricated using an epitaxial regrowth process, the T-VCSEL is electrically a Pnp-type bipolar junction transistor and consists of an undoped AlGaAs/GaAs bottom DBR, an InGaAs triple-quantum-well (TQW) active layer, an Si/SiO2 dielectric top DBR, and an intracavity contacting scheme with three electrical terminals. The output power is controlled by the base current in combination with the emitter-collector voltage, showing a voltage-controlled operation mode. A low threshold base-current of 0.8 mA and an output power of 1.8 mW have been obtained at room temperature. Continuous-wave operation was performed up to 50°C .
2004 IEEE International Topical Meeting on Microwave Photonics (IEEE Cat. No.04EX859), 2000
We propose a novel semiconductor based optical modulator with an ultralow VπL product < 0.005 ... more We propose a novel semiconductor based optical modulator with an ultralow VπL product < 0.005 V-cm, high RF gain and good dynamic range. The optical phase is induced by electromagnetically induced transparency. RF performance is evaluated.
Next-Generation Optical Networks for Data Centers and Short-Reach Links, 2014
ABSTRACT We discuss recent progress and challenges in realizing Bragg-grating devices on the subm... more ABSTRACT We discuss recent progress and challenges in realizing Bragg-grating devices on the submicron silicon-on-insulator platform for next-generation optical communications applications, such as on-chip optical interconnects and signal processing. In particular, we focus on grating-assisted, wavelength-selective couplers, known as contra-directional couplers (contra-DCs). In contrast to conventional two-port Bragg gratings operating in the reection mode, contra-DCs are four-port devices with very weak backreections and, therefore, can be easily integrated with other photonic components on a chip. In order to provide a reliable on-chip wavelength-division multiplexing (WDM) solution for high-speed optical interconnects, we have developed high-performance add-drop filters and, furthermore, wavelength multiplexers/demultiplexers with combined advantages of at-top responses, low insertion loss (< 1 dB), and low crosstalk (< -23 dB). These WDM devices are ultra-compact and highly tolerant to temperature uctuations (up to ±50 °C), showing great potential for large-scale integration and low-power consumption. We further discuss a novel four-port Bragg photonic resonator for high-speed, low-power optical switching. Using a coupler-chirped design with uniform Bragg gratings, we have recently achieved an on-chip, continuously tunable photonic delay line with low insertion loss. These system-orientated devices indicate great potential for large-scale integration of Bragg-grating-defined functions using CMOS-compatible silicon photonics technology.
Optical Fiber Communication Conference, 2014
ABSTRACT We demonstrate the first fiber grating coupler with focusing curved subwavelength struct... more ABSTRACT We demonstrate the first fiber grating coupler with focusing curved subwavelength structures. An ultra-wide 1-dB bandwidth of over 100 nm with -6.7 dB coupling efficiency at 1550 nm has been experimentally achieved.
2006 IEEE LEOS Annual Meeting Conference Proceedings, 2006
We present a lithographically tunable, resonant subwavelength grating based Fabry-Perot cavity st... more We present a lithographically tunable, resonant subwavelength grating based Fabry-Perot cavity structure for mutliwavelength array devices. Theoretical and experimental performance of the cavity is discussed
2013 IEEE Photonics Conference, 2013
ABSTRACT We demonstrate a multi-period Bragg grating device in a silicon-on-insulator rib wavegui... more ABSTRACT We demonstrate a multi-period Bragg grating device in a silicon-on-insulator rib waveguide. The sidewalls of the rib and the slab are corrugated using different periods, resulting in two Bragg wavelengths that are controlled separately.
OFC/NFOEC Technical Digest. Optical Fiber Communication Conference, 2005., 2005
The resonance frequency of several 1.55 µm VCSELs is enhanced from 7 GHz up tõ 50 GHz with the op... more The resonance frequency of several 1.55 µm VCSELs is enhanced from 7 GHz up tõ 50 GHz with the optical injection locking technique. This is the highest value reported for directly modulated lasers. 2005 Optical Society of America OCIS codes: (250.7260) Vertical cavity surface emitting lasers, (060.4080) Modulation.
2014 IEEE Photonics Conference, 2014
Photonics North 2014, 2014
ABSTRACT Vernier racetrack resonators offer advantages over single racetrack resonators such as e... more ABSTRACT Vernier racetrack resonators offer advantages over single racetrack resonators such as extending the free spectral range (FSR).(1-3) Here, we have presented a theoretical sensitivity analysis on quadruple Vernier racetrack resonators based on varying, one at a time, various fabrication dependent parameters. These parameters include the waveguide widths, heights, and propagation losses. We have shown that it should be possible to design a device that meets typical commercial specifications while being tolerant to changes in these parameters.
Optics letters, Jan 15, 2015
We have experimentally demonstrated, in silicon, a double microring resonator with Mach-Zehnder i... more We have experimentally demonstrated, in silicon, a double microring resonator with Mach-Zehnder interferometer-based coupling that meets many commercial specifications. Our device has a ripple of 0.5 dB, an adjacent channel isolation of at least 41.0 dB, a nonadjacent channel isolation of at least 38.6 dB, an interstitial peak suppression of at least 37.5 dB, an express channel isolation of 10.0 dB, and a free spectral range greater than the span of the C-band of 37.23 nm.
2010 17th International Conference on Telecommunications, 2010
We report our recent successful experiences related to the development of a transcontinental cour... more We report our recent successful experiences related to the development of a transcontinental course in silicon photonics offered by the University of British Columbia in collaboration with CMC Microsystems. The course is offered to students from across Canada and has attracted participants from nearly every Canadian university with an advanced photonics research program. The focus of the course is the
2006 IEEE LEOS Annual Meeting Conference Proceedings, 2006
A shallow-etched, distributed grating is proposed as a wavelength demultiplexer. Modeling results... more A shallow-etched, distributed grating is proposed as a wavelength demultiplexer. Modeling results predict up to 79% efficiency over a 60nm wavelength range. Device fabrication and measurements are presented.
2008 Conference on Lasers and Electro-Optics, 2008
We propose and experimentally demonstrate for the first time a communication system scheme with a... more We propose and experimentally demonstrate for the first time a communication system scheme with an OIL-VCSEL acting both as a transmitter and as a receiver, under an identical forward-bias condition.
... Aldo Di Carlo, University of Rome "Tor Vergata", Italy Matthias Auf der Mau... more ... Aldo Di Carlo, University of Rome "Tor Vergata", Italy Matthias Auf der Maur, University of Rome "Tor Vergata", Italy ... University, USA Lukas Chrostowski, University of British Columbia, Canada Martijn de Sterke, University of Sydney, Australia Aleksandra Djurisic, University of ...
Vertical-Cavity Surface-Emitting Lasers VIII, 2004
2013 IEEE Photonics Conference, 2013
ABSTRACT We propose and experimentally demonstrate the first THz-bandwidth on-chip fractional Hil... more ABSTRACT We propose and experimentally demonstrate the first THz-bandwidth on-chip fractional Hilbert transformer based on an integrated phase-shifted waveguide Bragg grating on silicon. Experimental results show an error of only 0.24 % at 940 GHz bandwidth.
We demonstrate the design and performance of series-coupled racetrack resonators in silicon-on-in... more We demonstrate the design and performance of series-coupled racetrack resonators in silicon-on-insulator. The device was modeled and optimized by tuning various parameters such as power coupling factors and resonator dimensions. The Vernier effect is experimentally verified with an extended free spectral range of 36.2 nm and an interstitial resonance suppression of more than 11 dB. To the best of our knowledge, we have shown the closest match between experimental and theoretical results for the Vernier effect. Devices exhibiting similar performance to the one reported on here should be useful in applications such as wavelength division multiplexers and optical sensors.
Electronics Letters, 2013
We demonstrate the first room-temperature operation of a transistor vertical-cavity surface-emitt... more We demonstrate the first room-temperature operation of a transistor vertical-cavity surface-emitting laser (T-VCSEL). Fabricated using an epitaxial regrowth process, the T-VCSEL is electrically a Pnp-type bipolar junction transistor and consists of an undoped AlGaAs/GaAs bottom DBR, an InGaAs triple-quantum-well (TQW) active layer, an Si/SiO2 dielectric top DBR, and an intracavity contacting scheme with three electrical terminals. The output power is controlled by the base current in combination with the emitter-collector voltage, showing a voltage-controlled operation mode. A low threshold base-current of 0.8 mA and an output power of 1.8 mW have been obtained at room temperature. Continuous-wave operation was performed up to 50°C .
2004 IEEE International Topical Meeting on Microwave Photonics (IEEE Cat. No.04EX859), 2000
We propose a novel semiconductor based optical modulator with an ultralow VπL product < 0.005 ... more We propose a novel semiconductor based optical modulator with an ultralow VπL product < 0.005 V-cm, high RF gain and good dynamic range. The optical phase is induced by electromagnetically induced transparency. RF performance is evaluated.
Next-Generation Optical Networks for Data Centers and Short-Reach Links, 2014
ABSTRACT We discuss recent progress and challenges in realizing Bragg-grating devices on the subm... more ABSTRACT We discuss recent progress and challenges in realizing Bragg-grating devices on the submicron silicon-on-insulator platform for next-generation optical communications applications, such as on-chip optical interconnects and signal processing. In particular, we focus on grating-assisted, wavelength-selective couplers, known as contra-directional couplers (contra-DCs). In contrast to conventional two-port Bragg gratings operating in the reection mode, contra-DCs are four-port devices with very weak backreections and, therefore, can be easily integrated with other photonic components on a chip. In order to provide a reliable on-chip wavelength-division multiplexing (WDM) solution for high-speed optical interconnects, we have developed high-performance add-drop filters and, furthermore, wavelength multiplexers/demultiplexers with combined advantages of at-top responses, low insertion loss (< 1 dB), and low crosstalk (< -23 dB). These WDM devices are ultra-compact and highly tolerant to temperature uctuations (up to ±50 °C), showing great potential for large-scale integration and low-power consumption. We further discuss a novel four-port Bragg photonic resonator for high-speed, low-power optical switching. Using a coupler-chirped design with uniform Bragg gratings, we have recently achieved an on-chip, continuously tunable photonic delay line with low insertion loss. These system-orientated devices indicate great potential for large-scale integration of Bragg-grating-defined functions using CMOS-compatible silicon photonics technology.
Optical Fiber Communication Conference, 2014
ABSTRACT We demonstrate the first fiber grating coupler with focusing curved subwavelength struct... more ABSTRACT We demonstrate the first fiber grating coupler with focusing curved subwavelength structures. An ultra-wide 1-dB bandwidth of over 100 nm with -6.7 dB coupling efficiency at 1550 nm has been experimentally achieved.
2006 IEEE LEOS Annual Meeting Conference Proceedings, 2006
We present a lithographically tunable, resonant subwavelength grating based Fabry-Perot cavity st... more We present a lithographically tunable, resonant subwavelength grating based Fabry-Perot cavity structure for mutliwavelength array devices. Theoretical and experimental performance of the cavity is discussed
2013 IEEE Photonics Conference, 2013
ABSTRACT We demonstrate a multi-period Bragg grating device in a silicon-on-insulator rib wavegui... more ABSTRACT We demonstrate a multi-period Bragg grating device in a silicon-on-insulator rib waveguide. The sidewalls of the rib and the slab are corrugated using different periods, resulting in two Bragg wavelengths that are controlled separately.
OFC/NFOEC Technical Digest. Optical Fiber Communication Conference, 2005., 2005
The resonance frequency of several 1.55 µm VCSELs is enhanced from 7 GHz up tõ 50 GHz with the op... more The resonance frequency of several 1.55 µm VCSELs is enhanced from 7 GHz up tõ 50 GHz with the optical injection locking technique. This is the highest value reported for directly modulated lasers. 2005 Optical Society of America OCIS codes: (250.7260) Vertical cavity surface emitting lasers, (060.4080) Modulation.
2014 IEEE Photonics Conference, 2014
Photonics North 2014, 2014
ABSTRACT Vernier racetrack resonators offer advantages over single racetrack resonators such as e... more ABSTRACT Vernier racetrack resonators offer advantages over single racetrack resonators such as extending the free spectral range (FSR).(1-3) Here, we have presented a theoretical sensitivity analysis on quadruple Vernier racetrack resonators based on varying, one at a time, various fabrication dependent parameters. These parameters include the waveguide widths, heights, and propagation losses. We have shown that it should be possible to design a device that meets typical commercial specifications while being tolerant to changes in these parameters.
Optics letters, Jan 15, 2015
We have experimentally demonstrated, in silicon, a double microring resonator with Mach-Zehnder i... more We have experimentally demonstrated, in silicon, a double microring resonator with Mach-Zehnder interferometer-based coupling that meets many commercial specifications. Our device has a ripple of 0.5 dB, an adjacent channel isolation of at least 41.0 dB, a nonadjacent channel isolation of at least 38.6 dB, an interstitial peak suppression of at least 37.5 dB, an express channel isolation of 10.0 dB, and a free spectral range greater than the span of the C-band of 37.23 nm.
2010 17th International Conference on Telecommunications, 2010
We report our recent successful experiences related to the development of a transcontinental cour... more We report our recent successful experiences related to the development of a transcontinental course in silicon photonics offered by the University of British Columbia in collaboration with CMC Microsystems. The course is offered to students from across Canada and has attracted participants from nearly every Canadian university with an advanced photonics research program. The focus of the course is the
2006 IEEE LEOS Annual Meeting Conference Proceedings, 2006
A shallow-etched, distributed grating is proposed as a wavelength demultiplexer. Modeling results... more A shallow-etched, distributed grating is proposed as a wavelength demultiplexer. Modeling results predict up to 79% efficiency over a 60nm wavelength range. Device fabrication and measurements are presented.
2008 Conference on Lasers and Electro-Optics, 2008
We propose and experimentally demonstrate for the first time a communication system scheme with a... more We propose and experimentally demonstrate for the first time a communication system scheme with an OIL-VCSEL acting both as a transmitter and as a receiver, under an identical forward-bias condition.
... Aldo Di Carlo, University of Rome "Tor Vergata", Italy Matthias Auf der Mau... more ... Aldo Di Carlo, University of Rome "Tor Vergata", Italy Matthias Auf der Maur, University of Rome "Tor Vergata", Italy ... University, USA Lukas Chrostowski, University of British Columbia, Canada Martijn de Sterke, University of Sydney, Australia Aleksandra Djurisic, University of ...
Vertical-Cavity Surface-Emitting Lasers VIII, 2004
2013 IEEE Photonics Conference, 2013
ABSTRACT We propose and experimentally demonstrate the first THz-bandwidth on-chip fractional Hil... more ABSTRACT We propose and experimentally demonstrate the first THz-bandwidth on-chip fractional Hilbert transformer based on an integrated phase-shifted waveguide Bragg grating on silicon. Experimental results show an error of only 0.24 % at 940 GHz bandwidth.
We demonstrate the design and performance of series-coupled racetrack resonators in silicon-on-in... more We demonstrate the design and performance of series-coupled racetrack resonators in silicon-on-insulator. The device was modeled and optimized by tuning various parameters such as power coupling factors and resonator dimensions. The Vernier effect is experimentally verified with an extended free spectral range of 36.2 nm and an interstitial resonance suppression of more than 11 dB. To the best of our knowledge, we have shown the closest match between experimental and theoretical results for the Vernier effect. Devices exhibiting similar performance to the one reported on here should be useful in applications such as wavelength division multiplexers and optical sensors.