Efficient mode converters and filters using asymmetrical directional couplers with subwavelength gratings

Chen, Xuefeng; Shi, Xiaodong; Qiu, Pengfei; Dai, Zijie; Yu, Yu; Song, Xiaoxian; Zhang, Haiting; Chen, Mingyang; Ye, Yunxia; Ren, Xudong; Zhang, Jingjing

doi:10.1364/ol.466344

Cited by 15 publications

(3 citation statements)

References 26 publications

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“…Mode blocking filters (MBFs) can be implemented in MDM systems, which filter out the undesired modes after demultiplexing different modes. Stripping the fundamental mode can be achieved by grating waveguides [47], Mach-Zehnder interferometer structures [48], asymmetric directional couplers [49], inversed designed metamaterials [50], L-shaped 3D graphene waveguides [51], and so on. It is straightforward to block a higherorder mode due to its weaker confinement through a tapered waveguide with a cut-off width and an appropriate waveguide bend.…”

Section: Mode Blocking Filtermentioning

confidence: 99%

Ultracompact Integrated Mode-Order Converter and Reciprocal Optical Diode with Etched Subwavelength Structures

Zhu,

Deng,

Chen

et al. 2023

Photonics

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Three ultracompact integrated photonic devices are proposed, assisted by etched structures. A mode-order converter (MOC) is achieved with a footprint of 0.85 × 1.4 μm2, which exhibits high performances with insertion loss (IL) below 0.34 dB and mode purity (MP) above 90% within 100 nm waveband. Moreover, a mode blocking filter (MBF) is proposed based on a subwavelength grating with a footprint of 0.8 × 4.12 μm2, which allows the propagation of TM0 mode but blocks the TM1 mode with a remarkably high extinction ratio of 31.6 dB at the wavelength of 1550 nm. Finally, a compact reciprocal optical diode (ROD) is presented by cascading the abovementioned MOC and MBF with a footprint of 0.85 × 5.9 μm2. This ROD enables one-way transmissions for both TM0 mode and TM1 mode with contrast ratios of 19.74 dB and 32.04 dB, respectively. The design methodology paves a new way for mode manipulation in integrated multimode photonic circuits.

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Section: Mode Blocking Filtermentioning

confidence: 99%

Ultracompact Integrated Mode-Order Converter and Reciprocal Optical Diode with Etched Subwavelength Structures

Zhu,

Deng,

Chen

et al. 2023

Photonics

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“…Over the past few years, metasurfaces have rapidly emerged as a fast developing research field due to their distinctive capabilities in optical manipulation. By adjusting the geometric parameters of nanostructures constituting the metasurfaces, manipulation of optical characteristics such as amplitude, phase, and polarization has been achieved [9][10][11][12][13][14] , leading to the realization plethora of ultrathin optical devices, including metalenses, holographic devices, and orbital angular momentum generators, etc [15][16][17][18][19][20][21][22] . Due to its inherent advantages of high sensitivity and high integration, polarization detectors based on metasurface designs have garnered widespread attention [23][24][25][26] .…”

Section: Introductionmentioning

confidence: 99%

Optimized optical catenary structures empower compact on-chip polarization detector

She,

Ha,

Guo

et al. 2024

Advanced Fiber Laser Conference (AFL2023)

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Polarized light has various applications in industrial inspection, remote sensing, and other fields. Traditional methods for detecting polarized light typically rely on the polarization properties of optical components or specific materials to detect and analyze light with different polarization states. However, the polarization detection system designed by these methods has a complex optical path, resulting in bulky size and high cost in large-scale integrated applications, thus hindering the development and application of polarization detection. Therefore, it is crucial to develop polarization detectors to meet the requirements of compact and highly integrated optical devices. The optical catenary structure is a kind of continuous metasurface structure, which has continuous, linear phase change and abundant electromagnetic modes. To further miniaturize the polarization detector for on-chip applications, a potential approach is to combine silicon waveguide with metasurface to achieve a compact, high-efficiency polarization detector. In this work, the on-chip beam polarization detector is effectively realized by using one single catenary gold nanostructure loaded atop silicon on an insulator (SOI) waveguide, which is optimized by the Particle Swarm Optimization algorithm. We envision that our finding could facilitate the application of polarization-optical devices and systems in various fields, including sensing, optical communications, imaging, quantum sciences, etc.

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“…Furthermore, compact photonic devices play a pivotal role in achieving high integration and low power consumption for photonic applications [5][6][7][8][9][10]. Specifically, their significance lies in their ability to accommodate a greater number of functional components within a small footprint, thereby enhancing the integration and functionality of photonic integrated circuits.…”

Section: Introductionmentioning

confidence: 99%

Gradient Probabilistic Algorithm for Compact Lithium Niobate Integrated Photonic Devices

Sheng,

Zhang,

Zhang

et al. 2024

Photonics

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Compact photonic devices are highly desired in photonic integrated circuits. In this work, we use an efficient inverse design method to design a 50/50 beam splitter in lithium niobate integrated platforms. We employ the Gradient Probability Algorithm (GPA), which is built upon traditional gradient algorithms. The GPA utilizes the adjoint method for the comprehensive calculation of the electric field across the entire design area in a single iteration, thereby deriving the gradient of the design area. This enhancement significantly accelerates the algorithm’s execution speed. The simulation results show that an ultracompact beam splitter with a footprint of 13μm × 4.5μm can be achieved in lithium niobate integrated platforms, where the insertion loss falls below 0.5 dB within the 1500 nm to 1700 nm range, thus reaching its lowest point of 0.15 dB at 1550 nm.

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Efficient mode converters and filters using asymmetrical directional couplers with subwavelength gratings

Cited by 15 publications

References 26 publications

Ultracompact Integrated Mode-Order Converter and Reciprocal Optical Diode with Etched Subwavelength Structures

Ultracompact Integrated Mode-Order Converter and Reciprocal Optical Diode with Etched Subwavelength Structures

Optimized optical catenary structures empower compact on-chip polarization detector

Gradient Probabilistic Algorithm for Compact Lithium Niobate Integrated Photonic Devices

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