Ultracompact and Broadband Silicon-Based Polarization Beam Splitter Using an Asymmetrical Directional Coupler

Ni, Bin; Xiao, Jinbiao

doi:10.1109/jqe.2017.2721539

Cited by 35 publications

(8 citation statements)

References 37 publications

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“…On the contrary, inverse/non-linear algorithm designs achieve extremely short devices at expense of a complex design process and a limited low-loss bandwidth. However, arguably the most widely used mechanism for polarization splitting in integrated photonic chips is directional coupling (DC-PBS) [16][17][18][19][20][21][22][23][24][25][26]. These splitters can be classified in two categories, symmetric and asymmetric.…”

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confidence: 99%

Polarization splitting directional coupler using tilted subwavelength gratings

et al. 2020

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On-chip polarization splitters are key elements for coherent optical communication systems and polarization diversity circuits. These devices are often implemented with directional couplers that are symmetric for one polarization and strongly asymmetric for the other polarization. To achieve this asymmetry, highly dissimilar waveguides are used in each coupler arm, often requiring additional material layers or etch steps. Here we demonstrate polarization splitting with a directional coupler composed of two fully etched subwavelength waveguides, which only differ in the tilt angle of the silicon segments. Our device exhibits deep-UV compatible feature sizes, is only 14 µm long, and covers a 72 nm bandwidth with insertion losses below 1 dB and an extinction ratio in excess of 15 dB. http://dx.doi.org/XX.XXXX/OL.XX.XXXXX

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confidence: 99%

Polarization splitting directional coupler using tilted subwavelength gratings

et al. 2020

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“…We have previously investigated a MZDI-type polarization beam splitter (PBS, hereafter referred to as MZDI-PBS) for use in polarization diversity operation [16]. There are several types of PBSs, such as the asymmetric waveguide directional coupler (DC) [17,18,19,20] bending coupler-type DC [21,22,23,24], plasmonic waveguide DC [23], multimode interferometer (MMI) [25,26], cascaded MMI [27], and MMI with subwavelength gratings [28]. A wide range of wavelengths over the C-band and a large polarization extinction ratio (PER) of > 20 dB have been reported using the bending DC structure, and a very small size has been achieved using a bending DC with plasmonic waveguides.…”

Section: Introductionmentioning

confidence: 99%

Polarization-diversity silicon photonic Mach-Zehnder delay interferometer for optical signal processing integrated with a phase-controllable polarization beam splitter

Arai

Uenohara

2020

IEICE Electron. Express

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This study investigates a polarization-diversity Mach-Zehnder delay interferometer (MZDI) for optical signal processing integrated with a polarization beam splitter (PBS) using silicon photonics technology. The PBS consists of two-stage MZDIs. By using the birefringence of the silicon waveguide and controlling the phase with thermal heaters on MZDIs, the polarization extinction ratio (PER) of the PBS was improved. MZDIs with a free spectral range (FSR) of 40 GHz in both TE and TM modes were designed using the group index for both polarization modes. The PER of 40-GHz-FSR MZDIs for TE and TM modes of 15 and 10 dB, respectively, within the C-band were observed.

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“…Directional couplers are often used for polarization beam splitting in highly birefringent photonic integration platforms such as silicon-on-insulator (SOI) [1][2][3][4][5]. These devices can be classified in two types: symmetric and asymmetric directional coupler polarization beam splitters (DC-PBS).…”

Section: Introductionmentioning

confidence: 99%