Sub-wavelength grating-assisted polarization splitter-rotators for silicon-on-insulator platforms

Ma, Minglei; Park, Anthony H. K.; Wang, Yun; Shoman, Hossam; Zhang, Fan; Jaeger, Nicolas A. F.; Chrostowski, Lukas

doi:10.1364/oe.27.017581

Cited by 49 publications

(16 citation statements)

References 20 publications

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“…More importantly, the automated adaptation and stabilization demonstrated in the paper can easily be adapted to such an N-channel WDM PR. The PSR used in our WDM PR can also be replaced by a more compact mode-evolution based PSR [33]. Thirdly, it should be noted that a time delay (the "TE-TM" delay) can result from the PSR and the differences between the "TE" and "TM" paths leading to the inputs to the tunable MZIs.…”

Section: Discussionmentioning

confidence: 99%

Automated Adaptation and Stabilization of a Tunable WDM Polarization-Independent Receiver on Active Silicon Photonic Platform

Shoman

Shekhar

et al. 2020

IEEE Photonics J.

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We demonstrate automated adaptation, and stabilization of a silicon photonic wavelength-division multiplexing (WDM), polarization-independent receiver. A two-channel, tunable WDM polarization-independent receiver is designed, and used to demonstrate automated WDM polarization control. Using a control algorithm based on Barzilai, and Borwein's two-point step size gradient descent method, we realize automated polarization adaptation, and wavelength stabilization for two arbitrarily polarized input data streams. 10 Gb/s on-off keying, and 20 Gb/s pulse-amplitude modulation 4-level formats are generated as the high-speed input data streams. In addition, we implement a long-duration experiment, in which we measure the bit-error-ratio for continuously varying polarization states, and changing chip temperatures. The experimental results show that, with the automated control, the WDM polarization-independent receiver can adapt, stabilize, and track the arbitrary input polarization states from a standard optical fiber into the transverse electric mode of a silicon waveguide, and simultaneously stabilize the transmitted wavelength channels at various chip temperatures. We also show how the presented WDM polarization-independent receiver scales with N channels, and propose an improved design for large-scale WDM applications.

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Section: Discussionmentioning

confidence: 99%

Automated Adaptation and Stabilization of a Tunable WDM Polarization-Independent Receiver on Active Silicon Photonic Platform

Shoman

Shekhar

et al. 2020

IEEE Photonics J.

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“…While lossless conversion of multiple modes into a single mode is not possible, converting n modes carried by a structure into n or more modes supported by a different structure is possible. Examples of such mode converter structures are presented in [44]- [47] which convert the two modes of a multi-mode waveguide into two supermodes supported by two single-mode waveguides. Therefore, to improve the photodetection process multi-mode to multimode conversion can be used first, Fig.…”

Section: Designing Antennas Beyond Conventional Performance Limitsmentioning

confidence: 99%

Breaking FOV-Aperture Trade-Off With Multi-Mode Nano-Photonic Antennas

Fatemi

Khial

Khachaturian

et al. 2021

IEEE J. Select. Topics Quantum Electron.

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Nano-photonic antennas are one of the key components in integrated photonic transmitter and receiver systems. Conventionally, grating couplers, designed to couple into an optical fiber, suffering from limitations such as large footprint and small field-of-view (FOV) have been used as on-chip antennas. The challenge of the antenna design is more pronounced for the receiver systems, where both the collected power by the antenna and its FOV often need to be maximized. While some novel solutions have been demonstrated recently, identifying fundamental limits and trade-offs in nano-photonic antenna design is essential for devising compact antenna structures with improved performance. In this paper, the fundamental electromagnetic limits, as well as fabrication imposed constraints on improving antenna effective aperture and FOV are studied, and approximated performance upper limits are derived and quantified. By deviating from the conventional assumptions leading to these limits, high-performance multi-mode antenna structures with performance characteristics beyond the conventional perceived limits are demonstrated. Finally, the application of a pillar multimode antenna in a dense array is discussed, an antenna array with more than 95% collection efficiency and 170°FOV is demonstrated, and a coherent receiving system utilizing such an aperture is presented.

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“…SWG provides a novel freedom to control the equivalent refractive index of waveguide. A SWG DC is well established for various functionalities, e.g., frequency selection [23,24], polarization management [25][26][27][28], and mode-order conversion [29,30]. Recently, Hi et al [31] proposed a scheme based on an eye-shape SWG DC with insertion loss of 0.14 dB (0.8 dB) for 1550 (2000) nm.…”

Section: Introductionmentioning

confidence: 99%

High-Contrast and Compact Integrated Wavelength Diplexer Based on Subwavelength Grating Anisotropic Metamaterial for 1550/2000 nm

Zhu

Liu

et al. 2021

IEEE Photonics J.

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A high contrast and compact wavelength diplexer is presented for conventional 1550 nm and emerging 2000 nm based on a subwavelength-grating (SWG) coupler. The SWG silicon waveguide thoroughly blocks the light propagation around 1550 nm but fully supports 2000 nm (extinction ratio: 43.11 dB). This grating type anisotropic metamaterial not only efficiently reduces the coupling length but also expands the operational bandwidth. Simulated by 3D finite-difference time-domain method, the proposed diplexer possesses remarkably low insertion loss and high contrast of 25.24 (31.7) dB at 1550 (2000) nm. The operational bandwidth of 200 (108) nm is achieved with contrast over 15 dB and insertion loss below 0.22 dB. The footprint of diplexer is only 5.27 μm × 11.85 μm. Moreover, such design has the scalability by simply tuning the geometrical parameters of SWG.

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Sub-wavelength grating-assisted polarization splitter-rotators for silicon-on-insulator platforms

Cited by 49 publications

References 20 publications

Automated Adaptation and Stabilization of a Tunable WDM Polarization-Independent Receiver on Active Silicon Photonic Platform

Automated Adaptation and Stabilization of a Tunable WDM Polarization-Independent Receiver on Active Silicon Photonic Platform

Breaking FOV-Aperture Trade-Off With Multi-Mode Nano-Photonic Antennas

High-Contrast and Compact Integrated Wavelength Diplexer Based on Subwavelength Grating Anisotropic Metamaterial for 1550/2000 nm

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