Asymmetrically coupled silicon-on-insulator microring resonators for compact add-drop multiplexers

Vorckel, A.; Monster, M.; Henschel, W.; Bolívar, P. Haring; Kurz, H.

doi:10.1109/lpt.2003.813419

Cited by 118 publications

(58 citation statements)

References 5 publications

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“…Resonant optical power ( 2 in the figure) launched into port 1 is transferred to port 4 via the microtoroid, while nonresonant waves are largely unaffected upon transmission beyond the resonator-waveguide junction. This system (symmetric or asymmetric geometry add-drop [15]) can be studied using a simple model based on the assumption of weak coupling between the resonator and waveguides, which is valid in the current work. Weak coupling allows the separation of individual contributions to the cavity field decay time.…”

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confidence: 99%

Ultralow Loss, HighQ, Four Port Resonant Couplers for Quantum Optics and Photonics

Rokhsari

Vahala

2004

Phys. Rev. Lett.

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We demonstrate a low-loss, optical four port resonant coupler (add-drop geometry), using ultrahigh Q (>10 8 ) toroidal microcavities. Different regimes of operation are investigated by variation of coupling between resonator and fiber taper waveguides. As a result, waveguide-to-waveguide power transfer efficiency of 93% (0.3 dB loss) and nonresonant insertion loss of 0.02% (<0:001 dB) for narrow bandwidth (57 MHz) four port couplers are achieved in this work. The combination of low-loss, fiber compatibility, and wafer-scale design would be suitable for a variety of applications ranging from quantum optics to photonic networks. DOI: 10.1103/PhysRevLett.92.253905 PACS numbers: 42.79.Gn, 42.60.Da, 42.82.Et, 42.79.Sz Minimizing optical loss is of crucial importance in various studies, as it is often the main obstacle in realizing distinct physical functionalities. This is true in quantum optical applications of microcavities where parasitic loss can both inhibit the generation of quantum states and interfere with intended coupling to a transport medium such as optical fiber [1][2][3][4][5][6][7][8]. Also, in photonic applications of these devices [9-12] the ability to attain high efficiency power transfer between two distinct waveguides is of great interest. The ability to attain coupling coefficients between the resonator and waveguides that are greater than the intrinsic round-trip loss of the cavity (usually called the overcoupled regime) is fundamental to achieve high waveguide-to-waveguide resonant power transfer efficiency. High waveguide coupling efficiency and high intrinsic quality factor are hence essential in all applications of waveguide-coupled resonator systems. Such characteristics ensure that the overall quality factor of the system can be dominated by the intentional control of waveguide loading (coupling into and out from the resonator) as opposed to parasitic mechanisms which include intrinsic losses of the cavity and scattering losses at the waveguide-resonator junctions. Ultrahigh-qualityfactor (UHQ) microresonators (Q > 10 8 ) have been extensively studied [7,8,13], and the ability to provide high efficiency coupling to UHQ devices by use of low-loss tapered fiber waveguides has also been verified [14]. In this Letter, we explore a new realm of performance enabled by the combination of these results. Toroidal microcavities with intrinsic Q factors in excess of 10 8 were fabricated and studied in the so-called add-drop geometry where a whispering-gallery mode enables resonant power transfer between two distinct waveguides. Greater than 93% power transfer efficiency is measured in devices having loaded Q factors of 3:3 10 6 (overall quality factor of the resonator including coupling to waveguides), while the nonresonant insertion loss remains less than 0.02%. The transfer efficiency is predicted to be even higher for lower loaded Q values. This represents a substantial improvement compared to all prior work on similar microcavity-type structures, elevating their performance to a level at whic...

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confidence: 99%

Ultralow Loss, HighQ, Four Port Resonant Couplers for Quantum Optics and Photonics

Rokhsari

Vahala

2004

Phys. Rev. Lett.

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“…Optical cavities on SOI can be implemented as ring or racetrack resonators or as photonic crystal cavities [30]. Several resonator applications have already been demonstrated, mostly for the near infrared wavelength range (around 1550 nm or 1310 nm), such as sensors [31], modulators [32] and multiplexers [33].…”

Section: Imec Technologymentioning

confidence: 99%

Silicon Nanophotonics Fabrication: An innovative graduate course

Chrostowski

Rouger

Deptuck

et al. 2010

2010 17th International Conference on Telecommunications

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Abstract-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 rapidly developing field of silicon photonics. Its aim is to provide the students with a breadth of competencies in designing optical circuits and systems using a silicon-on-insulator platform. The students taking the course gain familiarity in design, fabrication, and testing in an area of photonics that is destined to play an increasingly important, and in the long run ubiquitous, role in optical circuitry, impacting on areas such as optical interconnects, communications systems, and sensor systems.The course is structured using a blended-learning pedagogical approach consisting of an on-site workshop followed by designbased e-learning. The students' designs are fabricated using IMEC's passive photonic cSOI process, which is accessed through the European silicon photonics prototyping service ePIXfab. Student projects to date have included the design of integratedoptical circuits using combinations of ring resonators, waveguides, couplers, and photonic crystals for applications such as filters for WDM optical interconnects, demodulators for phase modulated signals, and lab-on-chip sensors.

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“…Because the system is periodic, we can identify a countably infinite set of Bragg frequencies in (10). These are the frequencies ω k±G evaluated at k = 0 or G 0 /2.…”

Section: Hamiltonian For a Periodic Structurementioning

confidence: 99%

Coupled-mode theory for periodic side-coupled microcavity and photonic crystal structures

2006

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We use a phenomenological Hamiltonian approach to derive a set of coupled mode equations that describe light propagation in waveguides that are periodically side-coupled to microcavities. The structure exhibits both Bragg gap and (polariton like) resonator gap in the dispersion relation. The origin and physical significance of the two types of gaps are discussed. The coupled-mode equations derived from the effective field formalism are valid deep within the Bragg gaps and resonator gaps.

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Asymmetrically coupled silicon-on-insulator microring resonators for compact add-drop multiplexers

Cited by 118 publications

References 5 publications

Ultralow Loss, HighQ, Four Port Resonant Couplers for Quantum Optics and Photonics

Ultralow Loss, HighQ, Four Port Resonant Couplers for Quantum Optics and Photonics

Silicon Nanophotonics Fabrication: An innovative graduate course

Coupled-mode theory for periodic side-coupled microcavity and photonic crystal structures

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