Low-crosstalk Si arrayed waveguide grating with parabolic tapers

Ye, Tong; Fu, Y.; Qiao, Lei; Chu, Tao

doi:10.1364/oe.22.031899

Cited by 62 publications

(29 citation statements)

References 26 publications

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“…However, edge couplers, as mentioned before, can only be placed near the chip facets and hence requires precise chip arrangement and cannot be used to test individual devices on the wafer. Several designs of linear grating-based adiabatic tapers involving linear [39], exponential [40] and parabolic [41] profiles have shown. However, there is a tradeoff between the taper length and coupling efficiency due to the adiabatic transition [42].…”

Section: Linear Grating Based Compact Tapersmentioning

confidence: 99%

Grating-Assisted Fiber to Chip Coupling for SOI Photonic Circuits

2018

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Fiber to chip coupling is a critical aspect of any integrated photonic circuit. In terms of ease of fabrication as well as wafer-scale testability, surface grating couplers are by far the most preferred scheme of the coupling to integrated circuits. In the past decade, considerable effort has been made for designing efficient grating couplers on Silicon-on-Insulator (SOI) and other allied photonic platforms. Highly efficient grating couplers with sub-dB coupling performance have now been demonstrated. In this article, we review the recent advances made to develop grating coupler designs for a variety of applications on SOI platform. We begin with a basic overview of design methodology involving both shallow etched gratings and the emerging field of subwavelength gratings. The feasibility of reducing footprint by way of incorporating compact tapers is also explored. We also discuss novel grating designs like polarization diversity as well as dual band couplers. Lastly, a brief description of various packaging and wafer-scale testing schemes available for fiber-chip couplers is elaborated.

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Section: Linear Grating Based Compact Tapersmentioning

confidence: 99%

Grating-Assisted Fiber to Chip Coupling for SOI Photonic Circuits

2018

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“…Moreover, the fundamental mode should propagate through tapers without converting into higher-order modes [11]. Tapers, also called spot-size converters, have been employed in a variety of devices such as arrayed-waveguide gratings [12], multimode interference couplers [13], and waveguide crossings [14]. Ensuring the adiabatic operation of the taper requires that reducing the width of the taper be slower than the diffraction spreading of the first-order mode, therefore, adiabatic tapers are considerably long.…”

Section: Introductionmentioning

confidence: 99%

Ultrashort waveguide tapers based on Luneburg lens

Badri

Gilarlue

2019

J. Opt.

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In integrated photonic circuits, silicon-on-insulator waveguides with different geometries have been employed to realize a variety of components. Therefore, efficient coupling of two different waveguides is crucial. In this paper, focusing property of the Luneburg lens is exploited to design waveguide tapers. The Luneburg lens, truncated in a shape of a parabolic taper with reduced footprint, is utilized to connect a 10 µm-wide waveguide to a 0.5 µm one with the same thickness with an average coupling loss of 0.35 dB in the entire O, E, S, C, L, and U bands of optical communications. The proposed compact taper with the length of 11 µm is implemented by varying the thickness of the guiding layer and compared with three conventional tapers with the same length. However, designing a coupler to connect waveguides with different thicknesses and widths is more challenging. By applying quasi-conformal transformation optics, we flatten the Luneburg lens and consequently increase the refractive index on the flattened side. As a result, we are able to couple two waveguides with different thicknesses and widths. The numerical simulations are used to evaluate the theoretically designed tapers. To our knowledge, this is the first study presenting ultrashort tapers based on truncated Luneburg lens.

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“…Since the taper length depends on the starting and ending waveguide width, the transition between a grating coupler (GC) and a single-mode photonic waveguide in a SOI platform is one of the largest [2][3][4][5][6][7][8][9][10][11][12][13]. Several designs of adiabatic tapers involving linear [7], exponential [8] and parabolic [9,10] profiles have been proposed. However, there is a tradeoff between the taper length and coupling efficiency due to the adiabatic transition [11,12].…”

Section: Introductionmentioning

confidence: 99%

Ultra-compact low-loss broadband waveguide taper in silicon-on-insulator

Sethi¹,

Haldar²,

Selvaraja³

2017

Opt. Express

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A novel design of large bandwidth, fabrication tolerant, CMOS-compatible compact tapers (15 um) have been proposed and experimentally demonstrated in silicon-on-insulator. The proposed taper along with linear grating couplers for spot-size conversion exhibits no degradation in the coupling efficiency compared to a standard focusing grating in 1550 nm band. A single taper design has a broadband operation over 600 nm that can be used in O, C and L-band. The proposed compact taper is highly tolerant to fabrication variations; 80 nm change in the taper width and 200 nm in end waveguide width varies the taper transmission by <0.4 dB. The footprint of the device i.e. taper along with the linear gratings is ~ 250 {\mu}m2; this is 20X smaller than the adiabatic taper and 2X smaller than the focusing grating coupler

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Low-crosstalk Si arrayed waveguide grating with parabolic tapers

Cited by 62 publications

References 26 publications

Grating-Assisted Fiber to Chip Coupling for SOI Photonic Circuits

Grating-Assisted Fiber to Chip Coupling for SOI Photonic Circuits

Ultrashort waveguide tapers based on Luneburg lens

Ultra-compact low-loss broadband waveguide taper in silicon-on-insulator

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