Tunable Grating Coupler by Thermal Actuation and Thermo-Optic Effect

Ho, Chong Pei; Zhao, Ziqiang; Li, Qiang; Takagi, Shinichi; Takenaka, Mitsuru

doi:10.1109/lpt.2018.2857469

Cited by 13 publications

(4 citation statements)

References 28 publications

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“…Generally, there are two main approaches of fiber-to-chip coupling, namely vertical coupling (or off-plane coupling) and butt coupling (or edge coupling/in-plane coupling) [12,13], according to the relative position of fiber and the photonic chip. For vertical coupling, grating couplers are mostly used, and fiber is placed above the device vertically or slightly slanted at a certain degree to ensure high coupling efficiency [14][15][16][17][18][19][20][21][22][23]. Grating couplers have some major advantages including compact size, wafer-level testing capability, and flexible coupling position, while there are also some drawbacks such as a relatively low coupling efficiency typically below 3 dB, narrow bandwidth, and high wavelength sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Edge Couplers in Silicon Photonic Integrated Circuits: A Review

Cheng

et al. 2020

Applied Sciences

143

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Silicon photonics has drawn increasing attention in the past few decades and is a promising key technology for future daily applications due to its various merits including ultra-low cost, high integration density owing to the high refractive index of silicon, and compatibility with current semiconductor fabrication process. Optical interconnects is an important issue in silicon photonic integrated circuits for transmitting light, and fiber-to-chip optical interconnects is vital in application scenarios such as data centers and optical transmission systems. There are mainly two categories of fiber-to-chip optical coupling: off-plane coupling and in-plane coupling. Grating couplers work under the former category, while edge couplers function as in-plane coupling. In this paper, we mainly focus on edge couplers in silicon photonic integrated circuits. We deliver an introduction to the research background, operation mechanisms, and design principles of silicon photonic edge couplers. The state-of-the-art of edge couplers is reviewed according to the different structural configurations of the device, while identifying the performance, fabrication feasibility, and applications. In addition, a brief comparison between edge couplers and grating couplers is conducted. Packaging issues are also discussed, and several prospective techniques for further improvements of edge couplers are proposed.

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Section: Introductionmentioning

confidence: 99%

Edge Couplers in Silicon Photonic Integrated Circuits: A Review

Cheng

et al. 2020

Applied Sciences

143

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“…The only presented MEMS tunable grating coupler targeting this application achieves a Δλ T max of 22.8 nm with 12 V actuation [99]. This performance is comparable to power-hungry thermo-optic tuning of grating couplers [107], [108], including MEMS-mediated thermo-optic designs [109], which in general feature δλ and efficiency variations well below the 6 nm and 0.5 dB reported by the MEMS device.…”

Section: Grating Couplersmentioning

confidence: 73%

MEMS for Photonic Integrated Circuits

Errando-Herranz

Takabayashi

Edinger

et al. 2020

IEEE J. Select. Topics Quantum Electron.

100

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“…These two types of optical coupling are distinguished from one another by the differing relative locations of the optical fiber and the silicon optical chip [6][7][8][9] . Vertical coupling mostly adopts a grating coupler, which is widely used due to its advantages of small size, flexible coupling position, and easy wafer testing [10][11][12] . However, this vertical coupling method also has the disadvantages of low coupling efficiency (loss higher than 3 dB), narrow bandwidth, polarization sensitivity, etc.…”

Section: Introductionmentioning

confidence: 99%