Low loss 1 × 8 silica-based phased array switch with low power consumption

Katayose, Satomi; Hashizume, Yoshio; Mori, Akira; Itoh, M.

doi:10.7567/jjap.53.08mb01

Cited by 7 publications

(13 citation statements)

References 20 publications

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“…Figure 1 shows the configuration of a 1 × N arrayedwaveguide optical switch. [13][14][15][16][17][18][19] It is composed of an input optical waveguide, two slab optical waveguides, arrayedwaveguides with the same length, and output optical waveguides. The light from the input optical waveguide spreads in the input slab optical waveguide, and its optical power is distributed to each arrayed-waveguide.…”

Section: Principlementioning

confidence: 99%

“…[7][8][9][10] Based on the 1 × 2 MZIs, waveguide-type optical switches with up to 32 × 32 ports have been reported using a silica-on-silicon planar lightwave circuit 11) or silicon photonics. 12) Compared with the optical switch based on the 1 × 2 MZIs, an arrayed-waveguide optical switch [13][14][15][16][17][18][19] based on optical beam steering 20,21) has an advantage of compactness because it has N output ports ( > N 2). In this configuration, after input light is distributed to each arrayed-waveguide in the input slab optical waveguide, a linear phase difference is given between the arrayed-waveguides.…”

Section: Introductionmentioning

confidence: 99%

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Design of arrayed-waveguide optical switch employing window function for crosstalk reduction

Shimada¹,

Watanabe²,

Nagayama³

et al. 2019

Jpn. J. Appl. Phys.

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An optical switch that routes optical signals without converting them into electrical signals is a key component used in optical fiber communications. It is required to exhibit low loss, low crosstalk, and low power consumption. A 1 × N arrayed-waveguide optical switch has an advantage whose circuit size is small. In a design of the 1 × N arrayed-waveguide optical switch, we employ some window functions other than a conventional Gaussian distribution. We show that slight modification of the optical power ratio between the arrayed-waveguides effectively suppresses the crosstalk to unrouted output ports.

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Section: Principlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of arrayed-waveguide optical switch employing window function for crosstalk reduction

Shimada¹,

Watanabe²,

Nagayama³

et al. 2019

Jpn. J. Appl. Phys.

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“…1, the SSCs were installed in the input waveguides. We have already demonstrated a conventional narrowly tapered SSC [18] for the 5%-Δ waveguide, but to improve fabrication tolerance, we employed a three-branched SSC [19]. Fig.…”

Section: B Three-branched Ssc For Low Loss Single-mode Fiber (Smf) Cmentioning

confidence: 99%

Heterogeneously Integrated PLC With Low-Loss Spot-Size Converter and Newly Developed Waveplate PBS for DC-DP-16QAM Receiver

Kurata

Hashizume

Aozasa

et al. 2015

J. Lightwave Technol.

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Digital coherent transmission systems with multilevel and multicarrier modulation formats have been moving beyond 100-G systems. In this paper, we report a one-chip 400-G coherent receiver founded on a silica-based planar lightwave circuit (PLC) integration platform. To integrate a polarization beam splitter (PBS), two polarization rotators, four-optical hybrids, and 16 high-speed photodiodes (PDs) in one chip, we employed a 5%-Δ waveguide with a minimum bending radius of 300 μm, and the heterogeneous integration of InP-PDs. To achieve a compact receiver without any degradation in optical passive performance, we also investigated a three-branched spot size converter with a low loss and a high-fabrication tolerance and a waveplate type PBS with a high-polarization extinction ratio. Using these techniques, we fabricated a dual-carrier dual-polarization (DP) 16-level quadrature amplitude modulation (QAM) receiver PLC, and successfully demonstrated 32-Gbaud DP-16QAM signal demodulation for each channel.Index Terms-Coherent receiver, digital coherent, grass waveguides, heterogeneous integration, optical 90°hybrid, optical fiber communication, photodiode, photonic integration circuits, polarization beam splitter, spot-size converter.

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“…Recently, ultrasonic phased array technique has been researched and adopted for billet inspection using the pulse echo method. [14][15][16][17] This technique enables highresolution inspection by focusing or steering an ultrasonic beam. However, phased array transducers are expensive and defect detection for high-attenuation billets is still difficult.…”

Section: Introductionmentioning

confidence: 99%

Defect detection and size estimation in billet from profile of time-of-flight using ultrasonic transmission method with linear scanning

Miyamoto

Mizutani

Ebihara

et al. 2015

Jpn. J. Appl. Phys.

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In this study, defect detection and size estimation in billet by transmission method with linear scanning were carried out and the validity of the method was evaluated by numerical simulation. In addition, the suitable signal frequency and aperture of transducers were clarified. As a result, the following were found: a defect can be detected, signals with frequencies lower than those generally used in conventional ultrasonic testing (i.e., 0.5–1.5 MHz) are desirable, and the time-of-flight (TOF) deviation Δτ becomes largest when the wavelength at center frequency and the aperture of transducers are comparable. Defect size can be estimated when a single defect exists alone and the defect is not near the surface of a billet. Although defect size estimation becomes difficult when the defect is near the surface of a billet, the defect can be detected by our proposed method.

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Low loss 1 × 8 silica-based phased array switch with low power consumption

Cited by 7 publications

References 20 publications

Design of arrayed-waveguide optical switch employing window function for crosstalk reduction

Design of arrayed-waveguide optical switch employing window function for crosstalk reduction

Heterogeneously Integrated PLC With Low-Loss Spot-Size Converter and Newly Developed Waveplate PBS for DC-DP-16QAM Receiver

Defect detection and size estimation in billet from profile of time-of-flight using ultrasonic transmission method with linear scanning

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