Efficient nonadiabatic planar waveguide tapers

Luyssaert, Bert; Bienstman, Peter; Vandersteegen, Peter; Dumon, Pieter; Baets, Roel

doi:10.1109/jlt.2005.850795

Cited by 53 publications

(31 citation statements)

References 12 publications

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“…This device has a relatively large length of ~470 μm, which may lead to a large dispersion for pulsed inputs. However, there are likely some potential improvement to reduce the taper length by using other taper shapes (e.g., parabolic or sinusoidal) [39] or adopting multi-variable optimizations (e.g., the genetic algorithm and particle swarm optimization) [40]. The PSR device performances are usually characterized by insertion loss (IL), crosstalk (XT) and polarization extinction ratio (PER) for each input polarization.…”

Section: Device Performance Characterization and Fabrication Tolerancmentioning

confidence: 99%

A silicon-on-insulator polarization diversity scheme in the mid-infrared

et al. 2015

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Abstract:We propose a silicon-on-insulator (SOI) polarization diversity scheme in the mid-infrared wavelength range. In consideration of absorption loss in silicon dioxide (SiO 2 ), the polarization splitter-rotator (PSR) is designed and optimized with silicon nitride (SiN) upper-cladding and SiO 2 lower-cladding. This asymmetry allows the PSR, which consists of mode-conversion tapers and subsequent mode-sorting asymmetric Yjunctions, to be fabricated with a simple one-step etching process. Simulation shows that our PSR has good performance with low mode conversion loss (< 0.25 dB) and low crosstalk (< -18 dB) in a very large wavelength range from 4.0 μm to 4.4 μm. The PSR also exhibits large fabrication tolerance with respect to the size deviations in waveguide width, height and refractive index of the upper-cladding. Additionally, PSR devices based on Y-junctions with SiO 2 upper-cladding, and SiN upper-and lower-claddings are designed for potential applications at shorter and longer wavelengths, respectively. These PSR devices could facilitate the development of silicon photonic devices in the mid-infrared.

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Section: Device Performance Characterization and Fabrication Tolerancmentioning

confidence: 99%

A silicon-on-insulator polarization diversity scheme in the mid-infrared

et al. 2015

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“…Nevertheless, there will be at least two potential optimizations to reduce the device length. First, the tapers could be further optimized by adopting some other shapes (e.g., parabolic or sinusoidal) and multi-variable optimization (e.g., the genetic algorithm and particle swarm optimization) [30]. Second, the MMI width could be improved because the MMI length is proportional to the square of the MMI width [25].…”

Section: Device Performance Characterization and Fabrication Tolerancmentioning

confidence: 99%

Proposal for fabrication-tolerant SOI polarization splitter-rotator based on cascaded MMI couplers and an assisted bi-level taper

Wang

Xuan

et al. 2014

Opt. Express

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Abstract:A novel silicon-on-insulator (SOI) polarization splitter-rotator (PSR) with a large fabrication tolerance is proposed based on cascaded multimode interference (MMI) couplers and an assisted mode-evolution taper. The tapers are designed to adiabatically convert the input TM 0 mode into the TE 1 mode, which will output as the TE 0 mode after processed by the subsequent MMI mode converter, 90-degree phase shifter (PS) and MMI 3 dB coupler. The numerical simulation results show that the proposed device has a < 0.5 dB insertion loss with < −17 dB crosstalk in C optical communication band. Fabrication tolerance analysis is also performed with respect to the deviations of MMI coupler width, PS width, slab height and upper-cladding refractive index, showing that this device could work well even when affected by considerable fabrication errors. With such a robust performance with a large bandwidth, this device offers potential applications for CMOS-compatible polarization diversity, especially in the booming 100 Gb/s coherent optical communications based on silicon photonics technology. Shastri, "112Gb/s DP-QPSK transmission over 2427km SSMF using small-size silicon photonic IQ modulator and low-power CMOS

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“…Though there exist several types of optical couplers [2][3][4][5][6][7][8][9], such as prism couplers, grating couplers and directional couplers, the tapered optical coupler is characterized by its simplicity and compatibility with planar technology circuits.…”

Section: Introductionmentioning

confidence: 99%

Radiation Field and Optical Coupling Evaluation Using a New Mathematical Model

Bacha¹,

Belghoraf²

2016

PIER M

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Abstract-The mathematical model elaborated in this paper is based on the concept of intrinsic modes in order to analyze and synthesize optical wave propagation along a non-uniform optical structure which is used in integrated optics communication as tapered optical coupler. The new mathematical model is simply developed by introducing modifications to the intrinsic integral, and its numerical evaluation illustrates the electromagnetic field distribution inside a taper thin film and also outside the waveguide constituted by the substrate and the cladding of lower refractive index. The proposed method permits efficiently tracking the behaviour of the optical waves both inside and outside the optical waveguide, and quantifying the radiation and optical coupling occurring from the taper thin film of higher refractive index to adjacent mediums until a total energy transfer; this happens at thicknesses lower than waveguide cutoff thickness of each mode. The new model can be applied to all types of tapered optical coupler, made from different optical materials and having different wedge angles.

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Efficient nonadiabatic planar waveguide tapers

Cited by 53 publications

References 12 publications

A silicon-on-insulator polarization diversity scheme in the mid-infrared

A silicon-on-insulator polarization diversity scheme in the mid-infrared

Proposal for fabrication-tolerant SOI polarization splitter-rotator based on cascaded MMI couplers and an assisted bi-level taper

Radiation Field and Optical Coupling Evaluation Using a New Mathematical Model

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