Ultra-broadband silicon polarization splitter-rotator based on the multi-mode waveguide

Xu, Hongnan; Shi, Yaocheng

doi:10.1364/oe.25.018485

Cited by 52 publications

(23 citation statements)

References 13 publications

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“…In the polarization diversity circuit, the incident light of dual polarization is first separated into two independent circuits by using a polarization beam splitter (PBS) assisted by a polarization rotator (PR), so that all the functional devices can work at a single polarization state. The divided polarizations are then combined by using the PBS assisted by the PR as a combiner. The PBS is one of the key components in the polarization diversity circuit for separating or combining polarizations.…”

Section: Introductionmentioning

confidence: 99%

Ultra‐Broadband and Ultra‐Compact On‐Chip Silicon Polarization Beam Splitter by Using Hetero‐Anisotropic Metamaterials

Dai

Shi

2019

Laser & Photonics Reviews

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131

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The polarization beam splitter (PBS) is an essential component in the polarization diversity circuit to overcome the strong polarization dependence of silicon nanophotonic devices. Among various PBS structures, the asymmetrical directional couplers (ADCs) are most commonly used due to the best overall performances. However, it is still challenging to realize an on‐chip silicon PBS with a small footprint, low loss, high extinction ratio, and, especially, broad bandwidth, simultaneously. The working bandwidth is limited for ADCs, since the wavelength difference will introduce deviations to both the effective indices and the coupling strength, which would distort the phase‐matching property and the optimal coupling length. In this paper, an on‐chip silicon PBS is proposed and demonstrated using “effective medium anisotropy” instead of “configuration asymmetry” to break the bandwidth bottleneck. The metamaterials with engineered anisotropy and dispersion are utilized to form a hetero‐anisotropic slab. For TM polarization, the slab performs as a multi‐mode interference coupler, while for TE polarization, the slab performs as two isolated waveguides. The fabricated PBS shows low loss <1 dB, high extinction ratio >20 dB, and a record working bandwidth >200 nm, with a footprint as small as 12.25 × 1.9 µm2.

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Section: Introductionmentioning

confidence: 99%

Ultra‐Broadband and Ultra‐Compact On‐Chip Silicon Polarization Beam Splitter by Using Hetero‐Anisotropic Metamaterials

Dai

Shi

2019

Laser & Photonics Reviews

Self Cite

131

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“…Both of them require a structure with an asymmetric refractive index profile in the vertical direction so that the fundamental TM can be effectively rotated. For strip waveguides, a simple way to break the vertical waveguide symmetry is to use an upper air cladding [206,207]. However, a top cladding of silicon dioxide for protection is generally preferred in silicon industry packaging.…”

Section: Polarization Splitters and Rotatorsmentioning

confidence: 99%

Scaling capacity of fiber-optic transmission systems via silicon photonics

2020

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The tremendous growth of data traffic has spurred a rapid evolution of optical communications for a higher data transmission capacity. Next-generation fiber-optic communication systems will require dramatically increased complexity that cannot be obtained using discrete components. In this context, silicon photonics is quickly maturing. Capable of manipulating electrons and photons on the same platform, this disruptive technology promises to cram more complexity on a single chip, leading to orders-of-magnitude reduction of integrated photonic systems in size, energy, and cost. This paper provides a system perspective and reviews recent progress in silicon photonics probing all dimensions of light to scale the capacity of fiber-optic networks toward terabits-per-second per optical interface and petabits-per-second per transmission link. Firstly, we overview fundamentals and the evolving trends of silicon photonic fabrication process. Then, we focus on recent progress in silicon coherent optical transceivers. Further scaling the system capacity requires multiplexing techniques in all the dimensions of light: wavelength, polarization, and space, for which we have seen impressive demonstrations of on-chip functionalities such as polarization diversity circuits and wavelength- and space-division multiplexers. Despite these advances, large-scale silicon photonic integrated circuits incorporating a variety of active and passive functionalities still face considerable challenges, many of which will eventually be addressed as the technology continues evolving with the entire ecosystem at a fast pace.

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“…The typical structures adopted are asymmetrical directional coupler (ADC) [18], tapered DC [19], bend DC [20,21], and so on. For mode evolution ones, mode hybridization between TM 0 mode and forward TE 1 mode can occur when light propagates along the adiabatic taper or multimode waveguide [22]. It should be noted that all the reported PSRs are designed for broadband operation, aiming as universal schemes for realizing polarization-transparent photonic integrated circuits (PICs).…”

Section: Introductionmentioning

confidence: 99%

Polarization Splitter-Rotator Based on Multimode Waveguide Grating

Luo

et al. 2021

Crystals

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We demonstrate a polarization splitter rotator (PSR) based on multimode waveguide grating (MWG) on a silicon-on-insulator (SOI) platform. Bloch mode hybridization in mini-stopband is exploited to achieve high polarization conversion efficiency. The fabricated device yields a high extinction ratio of > 53 dB and > 31 dB, low crosstalk of < −26.4 dB and < −40 dB for the injected TE0 and TM0 mode, with average insertion loss of 1.2 dB and 1.5 dB in the wavelength regime 1552 nm–1562 nm. Such a device shows great design flexibility and an easy fabrication process, serving as a good candidate in integrated polarization diversity circuits, especially for applications requiring spectra manipulation. Additionally, the polarization conversion approach provides opportunities to develop novel polarization management devices.

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Ultra-broadband silicon polarization splitter-rotator based on the multi-mode waveguide

Cited by 52 publications

References 13 publications

Ultra‐Broadband and Ultra‐Compact On‐Chip Silicon Polarization Beam Splitter by Using Hetero‐Anisotropic Metamaterials

Ultra‐Broadband and Ultra‐Compact On‐Chip Silicon Polarization Beam Splitter by Using Hetero‐Anisotropic Metamaterials

Scaling capacity of fiber-optic transmission systems via silicon photonics

Polarization Splitter-Rotator Based on Multimode Waveguide Grating

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