Silica-based 2.5%-Δ arrayed waveguide grating using simple polarisation compensation method with core width adjustment

Maru, Koichi; Okawa, M.; Abe, Yukio; Hakuta, T.; Himi, S.; Uetsuka, Hiroshi

doi:10.1049/el:20073098

Cited by 15 publications

(6 citation statements)

References 7 publications

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“…Similarly, we obtain 𝑃𝐷𝜆 = 0.026 nm for the type E AWG, which corresponds to a waveguide birefringence Δ𝑛 eff = 2.45 × 10 −5 . The 𝑃𝐷𝜆 measured in our experiment is comparable to the value of 0.05 nm achieved using polarization compensation by core width adjustment in 2.5% silica waveguides [25]. However, a birefringence of the order 10 −5 is still significant considering the high spectral resolution targeted by the AWG designs.…”

Section: Dicing Of the Output Facetsupporting

confidence: 80%

Design, simulation and characterization of integrated photonic spectrographs for Astronomy I: Generation-I AWG devices based on canonical layouts

Stoll,

Madhav,

Roth

2021

Preprint

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We present an experimental study on our first generation of custom-developed arrayed waveguide gratings (AWG) on silica platform for spectroscopic applications in near-infrared astronomy. We provide a comprehensive description of the design, numerical simulation and characterization of several AWG devices aimed at spectral resolving powers of 15,000 -60,000 in the astronomical H-band. We evaluate the spectral characteristics of the fabricated devices in terms of insertion loss and estimated spectral resolving power and compare the results with numerical simulations. We estimate resolving powers of up to 18,900 from the output channel 3-dB transmission bandwidth. Based on the first characterization results, we select two candidate AWGs for further processing by removal of the output waveguide array and polishing the output facet to optical quality with the goal of integration as the primary diffractive element in a cross-dispersed spectrograph. We further study the imaging properties of the processed AWGs with regards to spectral resolution in direct imaging mode, geometry-related defocus aberration, and polarization sensitivity of the spectral image. We identify phase error control, birefringence control, and aberration suppression as the three key areas of future research and development in the field of high-resolution AWG-based spectroscopy in astronomy.

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Section: Dicing Of the Output Facetsupporting

confidence: 80%

Design, simulation and characterization of integrated photonic spectrographs for Astronomy I: Generation-I AWG devices based on canonical layouts

Stoll,

Madhav,

Roth

2021

Preprint

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“…Numerical comparisons with a full wave commercial software successfully validate the proposed design procedure. Lens antennas are widely used in millimeter wave applications such as automotive radar [1,2], satellite transmissions [3], or indoor communications [4]. Lens antennas typically consist of a dielectric lens (spherical or hemispherical) fed by a primary source (single feed or array).…”

Section: Discussionmentioning

confidence: 99%

“…Arrayed waveguide gratings (AWGs) are key devices in optical communication systems in which they can serve as multiplexers [1][2][3][4][5], the spectral response of AWG plays an important role in dense wavelength-division multiplexing (DWDM) system. Some factors will result in the shift of the transmission spectrum of the AWG device, such as manufacturing tolerances, temperature, etc.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of a 17 × 17 polymer arrayed waveguide grating with flat spectral response

Qin

2010

Microw. Opt. Technol. Lett.

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“…For silica waveguides, the realization index contrasts of up to 4% using germanium doping have been previously reported by Bellman and other researchers at Corning [1] [13], although no further reports from these researchers seem to exist after 2004 on this subject. More recently, researchers from Hitachi have developed silica waveguides with a 2.5% index contrast [15][16]. Interestingly, researchers at NTT have also recently forayed into the 2.5% index contrast point to produce compact devices [17].…”

Section: High-contrast Silica-on-silicon-a Brief Reviewmentioning

confidence: 99%

High-contrast germanium-doped silica-on-silicon waveguides

Dumais

Callender

Blanchetière

et al. 2012

Photonics North 2012

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Silica-on-silicon planar lightwave circuits have a number of advantages including stability and low insertion loss to optical fiber networks. Standard GeO 2 doping levels in the waveguide cores lead to a refractive index contrast, ∆n/n, of 0.75%-2%. This range of index contrast requires relatively large bend radii in order to minimize bend losses. This limits the density scaling of these circuits. By using high dopant levels for a ∆n/n of 4%, the bend radius can be decreased to less than 1 mm, from which significant gains in optical circuit density can be obtained. In addition, low-loss ring resonators with free spectral ranges of a few tens of gigahertz can be realized, enabling some additional optical signal processing and filtering on that scale. Optical devices with such high dopant levels have been reported by Bellman et al. in 2004 [1] but to the authors' knowledge, no other experimental work on high-delta GeO 2 -doped waveguides has been reported since. In this paper, we present experimental measurements on high-delta devices including directional couplers, MMI couplers, Mach-Zehnder interferometers, and ring resonators. Device performance, including propagation loss, bend loss, interferometer contrast ratio and birefringence will be presented. We demonstrate that ring resonators with 40 GHz free spectral range can be fabricated for optical signal processing.

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Silica-based 2.5%-Δ arrayed waveguide grating using simple polarisation compensation method with core width adjustment

Cited by 15 publications

References 7 publications

Design, simulation and characterization of integrated photonic spectrographs for Astronomy I: Generation-I AWG devices based on canonical layouts

Design, simulation and characterization of integrated photonic spectrographs for Astronomy I: Generation-I AWG devices based on canonical layouts

Fabrication of a 17 × 17 polymer arrayed waveguide grating with flat spectral response

High-contrast germanium-doped silica-on-silicon waveguides

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