Comparison of Silicon Nitride Based 1×8 Y-Branch Splitters Applying Different Waveguide Structures

Seyringer, Dana; Chovan, Jozef; Gajdošová, Lenka; Figura, Daniel; Uherek, Frantisek

doi:10.1109/icton.2019.8840394

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…From Equation ( 6), it can be inferred that the output light intensity varies with the effective refractive index. We used Rsoft software to simulate the function of the proposed device [24][25][26][27]. The device structure was modeled as shown in Figure 2a, and the beam propagation method was used to simulate the light transmission in the sensor.…”

Section: Principles and Simulationmentioning

confidence: 99%

Evanescent Field Controllable MZ Sensor via Femtosecond Laser Processing and Mechanic Polishing

et al. 2021

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Recently, optical sensors interacting with evanescent fields and the external environment around waveguides have attracted extensive attention. In the process of light propagation in the waveguide, the depth of the evanescent field is closely related to the accuracy of the optical sensor, and adjusting the depth of the evanescent field to obtain higher accuracy has become the primary challenge in fabricating on-chip optical sensors. In this study, the waveguide structure of a Mach–Zehnder interferometer was written directly in Corning Eagle 2000 borosilicate glass by a femtosecond laser, and the sensing window was exposed out of the bulk material by mechanical polishing. The refractive index detection device based on the proposed on-chip Mach–Zehnder interferometer has the advantages of small volume, light weight, and good stability. Its sensitivity can reach 206 nm/RIU or 337 dB/RIU, and the theoretical maximum measurement range is 1–1.508. Therefore, it can measure the refractive index quickly and accurately in extreme or complex environments, and has excellent application prospects.

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Section: Principles and Simulationmentioning

confidence: 99%

Evanescent Field Controllable MZ Sensor via Femtosecond Laser Processing and Mechanic Polishing

et al. 2021

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“…In the context of this work rib waveguides are an attractive solution because single mode propagation can be achieved for larger dimensions, when compared with strip waveguides. Some of the most common beam splitting and combining devices/strategies rely on Y-junctions [11], [12], S-bends [12], coupled mode [12]- [14] or multi-mode interference (MMI) [12], [15]- [17]. Another technique often applied in rib waveguides due to its compactness, is based on trenches filled with a dielectric medium (e.g., air, SU-8), which act as mirrors and can find applications in light distribution, by employing a Tshaped branch geometry [12], [18].…”

Section: Introductionmentioning

confidence: 99%

Silicon Nitride Interferometers for Optical Sensing with Multi-micron Dimensions

Costa

Almeida²,

Fantoni³

et al. 2022

J. Phys.: Conf. Ser.

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Increasing the size of the smallest features of Photonic Integrated Circuits (PICs) to multi-micron dimensions can be advantageous to avoid expensive and complex lithographic steps in the fabrication process. In applications where extremely reduced chip size is not a requirement, the design of devices with multi-micron dimensions is potential interesting to avoid the need for e-beam lithography. Another benefit is that making the dimensions larger reduces the effect of lithographic imperfections such as waveguide surface roughness. However, the benefits do not come without limitations. Coupling the light in and out of the circuit is more challenging since diffraction gratings are not available when designing for such large dimensions. Circuit bends must have a larger radius of curvature and the existence of multimode propagation conditions can have detrimental impact in the performance of several devices, such as interferometers. In this study we perform simulations of the coupling between a lensed multimode optical fiber and a multi-micron a-SiN:H rib waveguide. Light coupling efficiency is analyzed as a function of distance variations using the FDTD method and compared with coupling to a strip waveguide. Moreover, we use numerical simulations to study the performance of a Mach-Zehnder interferometer sensitive to refractive index variations. Both the interferometer, splitters and combiners are designed with multi-micron dimensions.

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Comparison of Silicon Nitride Based 1×8 Y-Branch Splitters Applying Different Waveguide Structures

Cited by 2 publications

References 2 publications

Evanescent Field Controllable MZ Sensor via Femtosecond Laser Processing and Mechanic Polishing

Evanescent Field Controllable MZ Sensor via Femtosecond Laser Processing and Mechanic Polishing

Silicon Nitride Interferometers for Optical Sensing with Multi-micron Dimensions

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