Inverse design of efficient and compact 1 × N wavelength demultiplexer

Yilmaz, Yusuf Abdulaziz; Alpkilic, Ahmet Mesut; Yeltik, Aydan; Kurt, Hamza

doi:10.1016/j.optcom.2019.124522

Cited by 21 publications

(12 citation statements)

References 32 publications

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“…First, we design an on-chip CWDM with two 1550 nm and 1570 nm wavelength channels to demonstrate the momentumassisted adjoint method. Many WDM devices based on inverse design have been reported before [11], [12], [35], [36], [37], but how to achieve smaller channel spacing is still a challenge. To achieve a narrow channel spacing of 20 nm in a small footprint, we need a higher design dimension to endow the device pattern with a more sensitive wavelength-dependent performance.…”

Section: Inverse Design Of Cwdmmentioning

confidence: 99%

Momentum-Assisted Adjoint Method for Highly Efficient Inverse Design of Large-Scale Digital Nanophotonic Devices

Zeng

Xiang

et al. 2023

IEEE Photonics J.

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Gradient-descent-based digitized adjoint method offers a way to realize the high-efficiency inverse design of digital nanophotonic devices with diverse functions. However, the vanishing gradient problem encountered in the design of high-dimension devices may lead to significant inefficiencies, making it difficult to integrate novel functions on a single chip. Here, we propose a highly efficient digitized adjoint method for large-scale inverse design, called adaptive gradient-descent with momentum. It uses the firstand second-order momentum, instead of the gradient, to update the device pattern during adjoint optimization. To demonstrate the efficiency of the proposed method, we design a coarse wavelength division multiplexer and a three-mode power divider with design dimensions of 800 and 1360, respectively, which are approximately 2-4 times that of conventional digital nanophotonic devices. The simulation results show that, compared with the conventional gradient descent method, the momentum-assisted adjoint method has about 4-6 times higher efficiency and obtains better optimization performance, which provides a powerful tool for the inverse design of novel digital nanophotonic devices.

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Section: Inverse Design Of Cwdmmentioning

confidence: 99%

Momentum-Assisted Adjoint Method for Highly Efficient Inverse Design of Large-Scale Digital Nanophotonic Devices

Zeng

Xiang

et al. 2023

IEEE Photonics J.

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“…The previously demonstrated integrated photonic devices include reflectors, polarization rotators, , power splitters, , waveguide crossings, − mode (de)multiplexers, and bends . These inverse-designed devices have a compact footprint, low loss, and broad operating bandwidth, which enabled multifunctional integrated photonic systems. − For wavelength decorrelation, inverse-designed wavelength demultiplexers which function as a conventional spectrometer have been developed, giving a spectral channel spacing of dozens of nanometers. − However, a deterministic scheme of a speckle spectrometer based on inverse-designed components is yet to be explored.…”

Section: Introductionmentioning

confidence: 99%

Inverse-Designed Linear Coherent Photonic Networks for High-Resolution Spectral Reconstruction

Zhang

Wang

et al. 2023

ACS Photonics

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Miniaturized spectrometers on an integrated chip have many applications, such as material discrimination and portable sensing. However, it is challenging to achieve high resolution and ultrasmall footprint simultaneously in a spectrometer, because reducing its size results in concomitant degradation of its resolution or bandwidth. Here, we proposed and experimentally demonstrated an integrated photonic network for high-resolution spectral reconstruction. The photonic network, which consists of inverse-designed components with reduced footprints, serves as a multiport interferometer and provides the high-quality spectral fingerprint for reconstructing the input spectrum. As a result, spectral lines separated by 100 pm and continuous spectra were experimentally reconstructed from a device with an ultracompact footprint of 88 × 300 μm 2 . The demonstrated photonic network sets a new paradigm for high-resolution miniaturized spectrometers, which have great potential in spectroscopy-based sensing and imaging.

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“…By contrast, conveying different wavelengths to specific waveguides can be considered a great opportunity to redesign new compact and efficient optical communication systems. In this direction, in recent decades, WDMs have attracted significant attention with state-of-the-art nanophotonic design tools and approaches [5][6][7][8][9][10][11][12][13][14] . Optically conveying a light source with minimum loss is crucial in the design of efficient and integrable WDMs.…”

Section: Introductionmentioning

confidence: 99%

“…By contrast, the second approach is based on advanced algorithms and combined simulations to seek a solution that minimizes (or maximizes) a single objective or multi-objective related to the desired nanophotonics functionalities, also known as an "Inverse Design." Because non-heuristic methods provide an effective optimization of all structural parameters that are impossible with conventional methods, they have been used effectively in the design of nanophotonic devices [11][12][13][14][19][20][21][22][23][24][25][26][27][28][29][30][31] . One example of the first method is integrating a Mach-Zehnder interferometer (MZIs) and Si 3 N 4 on a silicon platform for the design of an on-chip polarization-insensitive WDM (PIWDM) device with a footprint of only 2.5 mm × 0.9 mm 10 .…”

Section: Introductionmentioning

confidence: 99%

“…By contrast, to achieve the optimum structure by using inverse design techniques, the gradient-based inverse design technique called "objective-first" is exploited. This approach is used in different nanophotonic applications such as WDMs 12 , optical diodes 28 , and metalenses with a tunable focal distance 29 . As the main limitation in the design of photonic structures, the structure to be fabricated can only be made using a limited number of different materials to realize the variation in the permittivity distributions through the structure.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical and experimental demonstration of inverse designed low-index polarization-insensitive wavelength demultiplexer

Icli¹,

Alpkilic²,

Yilmaz³

et al. 2021

J. Phys. D: Appl. Phys.

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The computational inverse design has paved the way for the design of highly efficient, compact, and novel nanophotonic structures beyond human intuition and trial-and-error approaches. Consequently, with this new design power, the exploration and implementation of multi-objective, complex, and functional nanophotonic devices become feasible. Herein, we used a recently emerged inverse design framework to demonstrate the design of a 1 × 2 polarization-insensitive wavelength division multiplexer (PIWDM) made of a low-refractive-index material with an index of 1.55. The designed PIWDM structure successfully steers toward the targeted channels for 1.30 µm and 1.55 µm with TE and TM polarizations, respectively. The transmission values were -2.42 and -2.18 dB for TE and -2.19 and -2.23 dB for TM polarization at the upper and lower waveguides, respectively. Taking advantage of the design with a low refractive index material, we scaled the structural dimensions corresponding to the microwave region, fabricated the compact device using a 3D printer, and conducted an experiment as a proof of concept. The experimentally verified PIWDM structure shows a power transmission efficiency of over -2.42 dB and a crosstalk value of less than -11.45 dB for the targeted wavelengths.

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Inverse design of efficient and compact 1 × N wavelength demultiplexer

Cited by 21 publications

References 32 publications

Momentum-Assisted Adjoint Method for Highly Efficient Inverse Design of Large-Scale Digital Nanophotonic Devices

Momentum-Assisted Adjoint Method for Highly Efficient Inverse Design of Large-Scale Digital Nanophotonic Devices

Inverse-Designed Linear Coherent Photonic Networks for High-Resolution Spectral Reconstruction

Numerical and experimental demonstration of inverse designed low-index polarization-insensitive wavelength demultiplexer

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