TM‐Mode selective filter using leaky waveguide structure

Ohke, Shigeaki; Umeda, Tsutomu; Cho, Yoshio

doi:10.1002/ecjb.10037

Cited by 5 publications

(5 citation statements)

References 14 publications

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“…For example, one can use leaky-mode propagation to design simple and compact filters for TM-polarized light. While traditional TE/TM mode filters typically use composite structures, such as metal-clad and buffer layers [36], or anisotropic substrates [37], we propose using straight single-constituent waveguides. Consider a waveguide whose width L x varies adiabatically as a function of z, so it consists of a wide and a narrow section.…”

Section: Discussionmentioning

confidence: 99%

Polarization dependence of the propagation constant of leaky guided modes

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Moiseyev

2018

Phys. Rev. A

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We show that transverse-magnetic (TM) leaky modes can propagate further than transverse electric (TE) modes in real-index dielectric waveguides. We compute the density of states and find that while the TE spectrum contains only overlapping resonances, the TM spectrum typically contains several isolated peaks. By transforming the TM equation into a Schrödinger-type equation, we show that these isolated peaks arise due to δ-function barriers at the core-cladding interface. Our theory is useful for a range of applications, including filtering TM modes from initially unpolarized light and transferring information between distant waveguides.

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Section: Discussionmentioning

confidence: 99%

Polarization dependence of the propagation constant of leaky guided modes

Pick

Moiseyev

2018

Phys. Rev. A

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“…Novelty of such mode selective filters originates from its simplicity over the counterparts, which utilize multilayer structures, metal films, or anisotropy of deposited film (Ohke et al 2002;Suematsu et al 1972;Okamura et al 1977). Therefore, the proposed mode selective device geometry has a huge advantage compared to previously mentioned filters (Ohke et al 2002;Suematsu et al 1972;Okamura et al 1977) due to its simplicity and ease of fabrication.…”

Section: Region Numbermentioning

confidence: 97%

Extensive mode mapping and novel polarization filter design for ALD grown Al2O3 ridge waveguides

et al. 2016

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In this work we report on realistic simulations aiming at extending our design knowledge on the fabrication and optimization of highly efficient integrated optical waveguide amplifiers. We focus specifically on atomic layer deposition grown Al 2 O 3 layers which will serve as the host matrix for rare-earth ion doping and form the basic device geometry. Current study aims at identification of the physical boundaries of single mode, wavelength and polarization insensitive zones (if any) for three different Al 2 O 3 film thicknesses of 0.5, 0.75 and 1 lm. Beam propagation method is used for systematic width and etch depth mapping of these films. In addition, geometrical propagation characteristics of the confinement factor are also estimated by tracking the optical power along the Al 2 O 3 ridge waveguides. Together with the technological requirements, this would give the optimal geometrical dimensions prior to microfabrication process of Er doped Al 2 O 3 based integrated optical amplifiers for the 1.48 lm to 1.61 lm wavelength range, within the third communication window. Our simulation efforts also reveal a potential TE and TM mode selective filter geometry, which can be fabricated using single step lithography.

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“…This so-called buffer layer isolates the light in the waveguiding structure from the substrate. Various functional integrated optical circuits [1] can be made using this approach, including those that exploit the specific properties of these structures like waveguide polarizers [2]. Besides waveguides made on high-index substrates, the existence of a high-index component in the proximity of an ordinary waveguide also creates a buffered leaky waveguiding structure.…”

Section: Introductionmentioning

confidence: 99%