Unconstrained splitting ratios in compact double-MMI couplers

Cherchi, Matteo; Ylinen, Sami; Harjanne, Mikko; Kapulainen, Markku; Vehmas, Tapani; Aalto, Timo

doi:10.1364/oe.22.009245

Cited by 34 publications

(15 citation statements)

References 12 publications

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“…Passive phase shifters obviate the requirements for driving power and complex control elements, and are suitable for many applications, including mode-division multiplexing (MDM) [17], 90° hybrids [18], arbitrary-ratio power splitters [19,20], etc., particularly where power consumption is a critical constrain. However, as the response of passive phase shifter cannot be actively tuned, it is also difficult to compensate fabrication errors.…”

Section: Introductionmentioning

confidence: 99%

Ultra-broadband nanophotonic phase shifter based on subwavelength metamaterial waveguides

et al. 2020

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Optical phase shifters are extensively used in integrated optics not only for telecom and datacom applications, but also for sensors and quantum computing. While various active solutions have been demonstrated, progress in passive phase shifters is still lacking. Here, we present a new type of ultra-broadband 90° phase shifter, which exploits the anisotropy and dispersion engineering in subwavelength metamaterial waveguides. Our Floquet-Bloch calculations predict a phase shift error below ±1.7° over an unprecedented operation range from 1.35 µm to 1.75 µm, i.e. 400 nm bandwidth covering the E, S, C, L and U telecommunication bands. The flat spectral response of our phase shifter is maintained even in the presence of fabrication errors up to ±20 nm, showing greater robustness than conventional structures. Our device was experimentally demonstrated using standard 220-nm-thick SOI wafers, showing a fourfold reduction in the phase variation compared to conventional phase shifters within the 145 nm wavelength range of our measurement setup. The proposed subwavelength engineered phase shifter paves the way for novel photonic integrated circuits with an ultra-broadband performance.

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Section: Introductionmentioning

confidence: 99%

Ultra-broadband nanophotonic phase shifter based on subwavelength metamaterial waveguides

et al. 2020

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“…In recent years, we have presented some methods to overcome the limitations of the previous approaches such as by cascading three or four MMI couplers [17], using an MZI structure with a multimode waveguide [18], using slot waveguide [19]. Other approaches are to use MMI structure with QR code-like nanostructure [20,21] or double MMI coupler [22]. However, such approaches still require a quite complex fabrication process and they have a large footprint.…”

Section: Introductionmentioning

confidence: 99%

Multimode Waveguides on an SOI Platform for Arbitrary Power Splitting Ratio Couplers

Thanh¹,

Le²

2018

Emerging Waveguide Technology

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Optical power couplers with arbitrary power splitting ratios are important components for many applications such as Mach-Zehnder interferometer-based structures, filters, switches, dispersion compensations, optical interconnects, and microring resonators. In this chapter, we present a new approach to achieve a very high compact coupler with arbitrary power splitting ratios on silicon on insulator (SOI) waveguides. The proposed device requires only one 4Â4 multimode interference (MMI) coupler. We use a passive wide SOI waveguide to achieve the phase shifter. The footprint of the whole device is only about 6Â150 μm 2. A large fabrication tolerance of AE50 nm can be achieved. The modified effective index method, beam propagation method, finite difference method, and finite difference-time difference method are used to optimally design the whole device.

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“…Unlike submicron SOI nanowires, however, these multimode strip waveguides do not efficiently evanescently couple. Therefore, fabricating ORR structures requires multimode interference couplers instead of directional couplers [36].…”

Section: Photonic Integrated Ttd Technologiesmentioning

confidence: 99%

Millimeter-Wave Photonics for Communications and Phased Arrays

Nanzer

Wichman

Klamkin

et al. 2015

Fiber and Integrated Optics

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This article presents recent developments in millimeter-wave communications architectures featuring broadband photonic signal generation, up-conversion and down-conversion, as well as true-time-delay photonic steering of millimeter-wave arrays. These developments will support future high-capacity millimeter-wave wireless communications by enabling broadband signals to be generated and converted between baseband and millimeter-wave carrier frequencies without electronic heterodyne systems and by permitting the use of true-time-delay beamsteering in millimeterwave array apertures.

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Unconstrained splitting ratios in compact double-MMI couplers

Cited by 34 publications

References 12 publications

Ultra-broadband nanophotonic phase shifter based on subwavelength metamaterial waveguides

Ultra-broadband nanophotonic phase shifter based on subwavelength metamaterial waveguides

Multimode Waveguides on an SOI Platform for Arbitrary Power Splitting Ratio Couplers

Millimeter-Wave Photonics for Communications and Phased Arrays

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