Polarization Beam Splitter Based on MMI Coupler With SWG Birefringence Engineering on SOI

Xu, Luhua; Wang, Yun; Kumar, Amar; Patel, David; El-Fiky, Eslam; Xing, Zhenping; Li, Rui; Plant, David V.

doi:10.1109/lpt.2018.2794466

Cited by 77 publications

(35 citation statements)

References 24 publications

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“…A more detailed description of this anisotropy phenomenon can be found in [26]. Indeed, this concept can be exploited to develop MMIs that act as broadband polarization splitters [27]. Recently, tilted SWGs were proposed as a means to control the anisotropy of the metamaterial, enabling independent engineering of the propagation constants of TE and TM polarized modes [28].…”

Section: Introductionmentioning

confidence: 99%

Design of a Broadband Polarization Splitter Based on Anisotropy-Engineered Tilted Subwavelength Gratings

et al. 2019

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Polarization management is of paramount importance in integrated optics, particularly for highly birefringent photonic platforms such as silicon-on-insulator. In this paper, we present a polarization beam splitter based on a multimode interference coupler incorporating tilted subwavelength gratings. The tilt provides accurate control of the structural anisotropy and enables independent selection of the beat length for two orthogonal polarization states. As a result, device length is reduced to less than 100 μm while simultaneously achieving broadband operation through subwavelength grating dispersion engineering. Insertion losses below 1 dB and an extinction ratio higher than 20 dB are demonstrated through three-dimensional FDTD simulation in a 131-nm bandwidth.

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Section: Introductionmentioning

confidence: 99%

Design of a Broadband Polarization Splitter Based on Anisotropy-Engineered Tilted Subwavelength Gratings

et al. 2019

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“…High-performance polarization beam splitters can be implemented using a variety of approaches including directional couplers [14,15], bi-level tapered waveguides [16,17], and partially etched multimode interference couplers (MMIs) [18]. These complex fabrication requirements can be circumvented by exploiting the anisotropic properties of SWGs, hence enabling the design of single etch polarization beam splitters for a variety of silicon thicknesses with remarkable performance [19][20][21]. While SWG-based splitters with extinction ratios (ER) in excess of 20 dBs, insertion losses (IL) well below 1 dB and bandwidths in excess of 150 nm have been reported, they often exhibit sub-100-nm minimum feature sizes (MFS) and use specialized cladding materials, such as SU-8, to achieve a good filling of the small gaps between the subwavelength elements [21].…”

Section: Introductionmentioning

confidence: 99%

Experimental demonstration of metamaterial anisotropy engineering for broadband on-chip polarization beam splitting

Herrero-Bermello¹,

Dias-Ponte²,

Luque‐González³

et al. 2020

Opt. Express

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Subwavelength metamaterials exhibit a strong anisotropy that can be leveraged to implement high-performance polarization handling devices in silicon-on-insulator. Whereas these devices benefit from single-etch step fabrication, many of them require small feature sizes or specialized cladding materials. The anisotropic response of subwavelength metamaterials can be further engineered by tilting its constituent elements away from the optical axis, providing an additional degree of freedom in the design. In this work, we demonstrate this feature through the design, fabrication and experimental characterization of a robust multimode interference polarization beam splitter based on tilted subwavelength gratings. A 110-nm minimum feature size and a standard silicon dioxide cladding are maintained. The resulting device exhibits insertion loss as low as 1 dB, an extinction ratio better than 13 dB in a 120-nm bandwidth, and robust tolerances to fabrication deviations.

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“…Sub-wavelength grating (SWG) structures have been used to control the dispersions to enhance the operation bandwidth in couplers [15]- [17]. The engineering on anisotropy of the SWGs can enlarge the difference between the beat lengths for TE and TM polarization, therefore a shorter and broadband PBS also can be achieved [18]- [20]. An ultra-compact PBS using SWG-based anisotropic metamaterials shows a record working bandwidth >200 nm with a small loss of <1 dB and a large ER of >20 dB [21].…”

Section: Introductionmentioning

confidence: 99%

High Performance Polarization Beam Splitter Based on Cascaded Directional Couplers Assisted by Effectively Anisotropic Structures

Chen

2019

IEEE Photonics J.

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A high performance polarization beam splitter (PBS) based on cascaded directional couplers (DCs) assisted by effectively anisotropic structures is proposed. The sub-wavelength grating (SWG) structures between the two coupled waveguides act as anisotropic metamaterial cladding to block/enhance light coupling for transverse electric (TE)/magnetic (TM) polarization. Cascading the DCs designed at different central wavelengths can improve the extinction ratio (ER) within the desired bandwidth or broaden the working wavelength bandwidth for TM polarization. Three design examples show the excellent performance of PBS with ER of >35 dB, 20 dB or 14 dB and loss of <0.12 dB, 0.4 dB or 0.8 dB over a bandwidth (BW) of 60 nm, 250 nm or 400 nm, which is difficult to achieve in any PBS structure reported before. The BW ER>20dB of the PBS based on the cascaded DCs increases by ∼11 times when compared with a single DC.

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Polarization Beam Splitter Based on MMI Coupler With SWG Birefringence Engineering on SOI

Cited by 77 publications

References 24 publications

Design of a Broadband Polarization Splitter Based on Anisotropy-Engineered Tilted Subwavelength Gratings

Design of a Broadband Polarization Splitter Based on Anisotropy-Engineered Tilted Subwavelength Gratings

Experimental demonstration of metamaterial anisotropy engineering for broadband on-chip polarization beam splitting

High Performance Polarization Beam Splitter Based on Cascaded Directional Couplers Assisted by Effectively Anisotropic Structures

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