Analysis of the polarization rotation effect in the inversely tapered spot size converter

Jia, Litao; Liow, Tsung-Yang; Song, Junfeng; Huang, Ying; Tu, Xiaoguang; Luo, Xianshu; Li, Chao; Qing, Feng‐Ling; Yu, Mingbin; Lo, Guo‐Qiang

doi:10.1364/oe.23.027776

Cited by 12 publications

(3 citation statements)

References 12 publications

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“…Although a fiber based mode splitter may couple to optical fiber links better, however, often a compact photonic integrated circuit (PIC) based design can be considered to integrate such mode splitter with other functional devices. Silicon PIC with lower than 5 µm bending radius can yield a very compact functional device, however, to mitigate coupling loss various coupling approaches are being considered, such as grating couplers [12] and tapered [13] or uniform spot-size coupler [14] to couple silicon PIC to an optical fiber with a significantly larger spot-size. Such mode splitters can be designed by using asymmetrical Y-splitter [15], MMI [16] and micro-ring [17] based approaches.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Design of compact mode splitters using identical coupled waveguides with slots

Hada

Rahman

2019

OSA Continuum

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In the past, multimode transmission through fibers has not been considered a preferred means of signal propagation due to the intermodal dispersion, which limits the data rate. However, recently, there has been an interest in using different modes as individual channels to increase the overall data rate. However, the challenging task in implementing such a system is that each individual mode has to be excited separately without mixing, and these should remain separated even at the bents and splices, and finally, they need to be collected separately. In this paper, design and optimization of a compact optical mode splitter by introducing a small slot in a silicon nanowire waveguide is demonstrated by employing a full-vectorial finite element method. The authors report here that by creating a slot within a waveguide, the desired coupling length ratio of 1:2 between the fundamental and the second modes can be obtained. The waveguide junctions have also been analyzed by using a rigorous least squares boundary residual method to study power transfer efficiency and effect of fabrication tolerances.

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Section: Theoretical Backgroundmentioning

confidence: 99%

Design of compact mode splitters using identical coupled waveguides with slots

Hada

Rahman

2019

OSA Continuum

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“…Also, disadvantages of using lensed fiber are of critical fabrication process and small alignment tolerance. Another approach is to integrate a taper spot-size converter (SSC) into the PIC system [20][21][22]. A 3D taper structure can adiabatically transform the mode of an SOI waveguide to the fiber mode.…”

Section: Introductionmentioning

confidence: 99%

Multi-Poly-Silicon-Layer-Based Spot-Size Converter for Efficient Coupling Between Silicon Waveguide and Standard Single-Mode Fiber

et al. 2016

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A novel spot-size converter (SSC) incorporating phase matched polycrystalline-silicon (Poly-Si) multi-layer is proposed and optimised for efficient nanophotonic coupling, which can be fabricated by using the CMOS compatible process and can be directly integrated. An efficient algorithm, combining the rigorous H-field based full-vectorial finite element method and the least squares boundary residual method, is developed for the design optimization of the SSC. Use of simple single layer and multi-layer Poly-Si based SSCs are investigated, in which the coupling process, phase matching for isolated and composite waveguides are also carried out. The coupling loss can be reduced to 2.72 dB by using an eleven Poly-Si layers based SSC. The on-chip integrated SSC opens up the feasibility of a low cost passive aligned fiber-pigtailed electronic-photonics integrated circuits platform.

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“…No obstante, las 1.2 Propiedades ópticas del silicio pérdidas de acoplo que pueden conseguirse con este tipo de estructuras están por debajo de 1dB. Múltiples investigaciones sobre el funcionamiento y optimización de este tipo de acopladores se han realizado para longitudes de onda de operación en banda C [15]. Las estructuras propuestas para cambiar el tamaño del modo de propagación son variadas [16].…”

Section: Acoplador Mediante Convertidor De Tamaño De Modounclassified

Dispositivos emisores de luz para transmisión óptica de alta velocidad

Luzuriaga¹,

Alejandro²

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Silicon photonics is one of the technologies that has raised a higher interest during the last two decades. Therefore, the development of photonic integrated circuits has had an important presence in the research of new components and devices for the improvement of performance in optical communication systems. One of the main advantages of silicon photonics is its compatibility with CMOS electronic technology, which makes it a promising platform for mass production at low cost. The reduced size of photonic structures and the low propagation losses achieved in nanometric photonic waveguides has allowed the development of devices with a high density of integration. Similarly, high-speed optical modulators and highly efficient photodetectors have been demonstrated. However, the development of the light source or laser, an indispensable element in any optical communication system, is not possible due to the indirect bandgap of silicon. Therefore, other direct bandgap materials have been studied and proposed to integrate a laser on the silicon chip with emission in the O and C bands. The main challenge lies in reaching the coherent stimulated emission regime by means of an electric pump and in an efficient way. For this, several integration schemes have been proposed. Monolithic integration deals with the fabrication of the laser directly on the chip. On the other hand, hybrid integration consists in the fabrication of the laser separately to later be integrated into the chip. The best results have been achieved by means of this approach. Therefore, the main goal of the thesis has been the development of an external cavity laser by means of a hybrid integration scheme and with operation in the O-band. The different basic building blocks have been analyzed, designed, fabricated and experimentally demonstrated. Finally, the integration with the active material has been carried out, successfully demonstrating stimulated emission and single-mode operation. In addition, the thesis has also addressed the coupling to slow waveguide guidance structures, which have been proposed in monolithic integration schemes.

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Analysis of the polarization rotation effect in the inversely tapered spot size converter

Cited by 12 publications

References 12 publications

Design of compact mode splitters using identical coupled waveguides with slots

Design of compact mode splitters using identical coupled waveguides with slots

Multi-Poly-Silicon-Layer-Based Spot-Size Converter for Efficient Coupling Between Silicon Waveguide and Standard Single-Mode Fiber

Dispositivos emisores de luz para transmisión óptica de alta velocidad

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