The Experts below are selected from a list of 18177 Experts worldwide ranked by ideXlab platform
S J B Yoo - One of the best experts on this subject based on the ideXlab platform.
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Silicon nitride tri-layer vertical Y-junction and 3D couplers with arbitrary Splitting Ratio for photonic integrated circuits
Optics express, 2017Co-Authors: Kuanping Shang, Shibnath Pathak, Guangyao Liu, Shaoqi Feng, Weicheng Lai, S J B YooAbstract:We designed and demonstrated a tri-layer Si3N4/SiO2 photonic integrated circuit capable of vertical interlayer coupling with arbitrary Splitting Ratios. Based on this multilayer photonic integrated circuit platform with each layer thicknesses of 150 nm, 50 nm, and 150 nm, we designed and simulated the vertical Y-junctions and 3D couplers with arbitrary power Splitting Ratios between 1:10 and 10:1 and with negligible(< −50 dB) reflection. Based on the design, we fabricated and demonstrated tri-layer vertical Y-junctions with the Splitting Ratios of 1:1 and 3:2 with excess optical losses of 0.230 dB. Further, we fabricated and demonstrated the 1 × 3 3D couplers with the Splitting Ratio of 1:1:4 for symmetric structures and variable Splitting Ratio for asymmetric structures.
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silicon nitride tri layer 1 3 couplers with arbitrary Splitting Ratio for 3d photonic integrated circuits
Optical Fiber Communication Conference, 2017Co-Authors: Kuanping Shang, Guangyao Liu, Shaoqi Feng, S J B YooAbstract:We design tri-layer Si 3 N 4 1×3 couplers with arbitrary power Splitting Ratio and small reflection for 3D photonic integrated circuits. We demonstrate the power Splitting Ratio from 1:1:4 to 1:22:27 with 0.185 dB excess loss.
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OFC - Silicon nitride tri-layer 1×3 couplers with arbitrary Splitting Ratio for 3D photonic integrated circuits
Optical Fiber Communication Conference, 2017Co-Authors: Kuanping Shang, Guangyao Liu, Shaoqi Feng, S J B YooAbstract:We design tri-layer Si 3 N 4 1×3 couplers with arbitrary power Splitting Ratio and small reflection for 3D photonic integrated circuits. We demonstrate the power Splitting Ratio from 1:1:4 to 1:22:27 with 0.185 dB excess loss.
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tri layer vertical y junction si3n4 sio2 3d photonic integrated circuits with arbitrary Splitting Ratio
Optical Fiber Communication Conference, 2016Co-Authors: Kuanping Shang, Shibnath Pathak, Binbin Guan, Guangyao Liu, Shaoqi Feng, S J B YooAbstract:We design Si3N4 tri-layer vertical Y-junction with arbitrary Splitting Ratio and low reflection, fabricate bi-layer asymmetric vertical coupler, and demonstrate tri-layer vertical Y-junction with Splitting Ratio of 1:1 and 3:2 for multilayer photonic integrated circuits.
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OFC - Tri-layer, vertical Y-junction, Si3N4/SiO2 3D photonic integrated circuits with arbitrary Splitting Ratio
Optical Fiber Communication Conference, 2016Co-Authors: Kuanping Shang, Shibnath Pathak, Binbin Guan, Guangyao Liu, Shaoqi Feng, S J B YooAbstract:We design Si3N4 tri-layer vertical Y-junction with arbitrary Splitting Ratio and low reflection, fabricate bi-layer asymmetric vertical coupler, and demonstrate tri-layer vertical Y-junction with Splitting Ratio of 1:1 and 3:2 for multilayer photonic integrated circuits.
Hiroki Takahashi - One of the best experts on this subject based on the ideXlab platform.
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y branch waveguides with stabilized Splitting Ratio designed by wavefront matching method
IEEE Photonics Technology Letters, 2006Co-Authors: Yohei Sakamaki, Takashi Saida, Tsugumichi Shibata, Yasuhiro Hida, T. Hashimoto, M. Tamura, Hiroki TakahashiAbstract:We designed optical Y-branch waveguides with a stabilized Splitting Ratio by using a new design approach based on the wavefront matching method. The designed Y-branches were fabricated using silica-based planar lightwave circuit technology. We suppressed any variation in the Splitting Ratio of the Y-branch experimentally and obtained excess losses of <0.35 dB over a wide wavelength range of 1.3-1.7 /spl mu/m.
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Y-branch waveguides with stabilized Splitting Ratio designed by wavefront matching method
IEEE Photonics Technology Letters, 2006Co-Authors: Yohei Sakamaki, Takashi Saida, Tsugumichi Shibata, Yasuhiro Hida, T. Hashimoto, M. Tamura, Hiroki TakahashiAbstract:We designed optical Y-branch waveguides with a stabilized Splitting Ratio by using a new design approach based on the wavefront matching method. The designed Y-branches were fabricated using silica-based planar lightwave circuit technology. We suppressed any variation in the Splitting Ratio of the Y-branch experimentally and obtained excess losses of
Kuanping Shang - One of the best experts on this subject based on the ideXlab platform.
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Silicon nitride tri-layer vertical Y-junction and 3D couplers with arbitrary Splitting Ratio for photonic integrated circuits
Optics express, 2017Co-Authors: Kuanping Shang, Shibnath Pathak, Guangyao Liu, Shaoqi Feng, Weicheng Lai, S J B YooAbstract:We designed and demonstrated a tri-layer Si3N4/SiO2 photonic integrated circuit capable of vertical interlayer coupling with arbitrary Splitting Ratios. Based on this multilayer photonic integrated circuit platform with each layer thicknesses of 150 nm, 50 nm, and 150 nm, we designed and simulated the vertical Y-junctions and 3D couplers with arbitrary power Splitting Ratios between 1:10 and 10:1 and with negligible(< −50 dB) reflection. Based on the design, we fabricated and demonstrated tri-layer vertical Y-junctions with the Splitting Ratios of 1:1 and 3:2 with excess optical losses of 0.230 dB. Further, we fabricated and demonstrated the 1 × 3 3D couplers with the Splitting Ratio of 1:1:4 for symmetric structures and variable Splitting Ratio for asymmetric structures.
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silicon nitride tri layer 1 3 couplers with arbitrary Splitting Ratio for 3d photonic integrated circuits
Optical Fiber Communication Conference, 2017Co-Authors: Kuanping Shang, Guangyao Liu, Shaoqi Feng, S J B YooAbstract:We design tri-layer Si 3 N 4 1×3 couplers with arbitrary power Splitting Ratio and small reflection for 3D photonic integrated circuits. We demonstrate the power Splitting Ratio from 1:1:4 to 1:22:27 with 0.185 dB excess loss.
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OFC - Silicon nitride tri-layer 1×3 couplers with arbitrary Splitting Ratio for 3D photonic integrated circuits
Optical Fiber Communication Conference, 2017Co-Authors: Kuanping Shang, Guangyao Liu, Shaoqi Feng, S J B YooAbstract:We design tri-layer Si 3 N 4 1×3 couplers with arbitrary power Splitting Ratio and small reflection for 3D photonic integrated circuits. We demonstrate the power Splitting Ratio from 1:1:4 to 1:22:27 with 0.185 dB excess loss.
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tri layer vertical y junction si3n4 sio2 3d photonic integrated circuits with arbitrary Splitting Ratio
Optical Fiber Communication Conference, 2016Co-Authors: Kuanping Shang, Shibnath Pathak, Binbin Guan, Guangyao Liu, Shaoqi Feng, S J B YooAbstract:We design Si3N4 tri-layer vertical Y-junction with arbitrary Splitting Ratio and low reflection, fabricate bi-layer asymmetric vertical coupler, and demonstrate tri-layer vertical Y-junction with Splitting Ratio of 1:1 and 3:2 for multilayer photonic integrated circuits.
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OFC - Tri-layer, vertical Y-junction, Si3N4/SiO2 3D photonic integrated circuits with arbitrary Splitting Ratio
Optical Fiber Communication Conference, 2016Co-Authors: Kuanping Shang, Shibnath Pathak, Binbin Guan, Guangyao Liu, Shaoqi Feng, S J B YooAbstract:We design Si3N4 tri-layer vertical Y-junction with arbitrary Splitting Ratio and low reflection, fabricate bi-layer asymmetric vertical coupler, and demonstrate tri-layer vertical Y-junction with Splitting Ratio of 1:1 and 3:2 for multilayer photonic integrated circuits.
Weihua Han - One of the best experts on this subject based on the ideXlab platform.
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ultra compact low loss 1 4 optical power splitter with Splitting Ratio of 1 2 4 8 based on two stage cascaded mmi couplers
Optics Letters, 2019Co-Authors: Yang Liu, Huan Guan, Weihua HanAbstract:An ultra-compact low-loss 1×4 optical power splitter with a Splitting Ratio of 1∶2∶4∶8 is proposed and demonstrated on a 220-nm-thick silicon-on-insulator (SOI) platform at the C band. The splitter is based on two stages of a cascaded 1×3 multimode interference (MMI) coupler and a 4×4 MMI coupler. The footprint of the device is 124.0 μm×6.4 μm, which is more compact than the traditional scheme of four-stage cascaded 1×2 MMI couplers. Phase shifters based on taper waveguides are incorporated in the device as the connection of two MMI couplers. The fabricated device exhibits a 3 dB power difference with a deviation of less than 0.88 dB from 1530 nm to 1570 nm. The average power difference is 3.14 dB at the center of the C band with an insertion loss of 1.84 dB.
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Ultra-compact low-loss 1 × 4 optical power splitter with Splitting Ratio of 1∶2∶4∶8 based on two-stage cascaded MMI couplers.
Optics letters, 2019Co-Authors: Yang Liu, Huan Guan, Weihua HanAbstract:An ultra-compact low-loss 1×4 optical power splitter with a Splitting Ratio of 1∶2∶4∶8 is proposed and demonstrated on a 220-nm-thick silicon-on-insulator (SOI) platform at the C band. The splitter is based on two stages of a cascaded 1×3 multimode interference (MMI) coupler and a 4×4 MMI coupler. The footprint of the device is 124.0 μm×6.4 μm, which is more compact than the traditional scheme of four-stage cascaded 1×2 MMI couplers. Phase shifters based on taper waveguides are incorporated in the device as the connection of two MMI couplers. The fabricated device exhibits a 3 dB power difference with a deviation of less than 0.88 dB from 1530 nm to 1570 nm. The average power difference is 3.14 dB at the center of the C band with an insertion loss of 1.84 dB.
Masamichi Fujiwara - One of the best experts on this subject based on the ideXlab platform.
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long reach and high Splitting Ratio wdm tdm pon systems using burst mode automatic gain controlled soas
Journal of Lightwave Technology, 2016Co-Authors: Masamichi Fujiwara, Ryo KomaAbstract:This paper presents novel burst-mode automatic gain controlled semiconductor optical amplifiers (AGC-SOAs) that are utilized as one upstream channel of a repeater in long-reach time- and wavelength-division multiplexed passive optical networks (WDM/TDM-PONs). Two SOAs are cascaded in the AGC-SOAs to achieve high gain. Two-stage gain switching with a fast feed forward (FF) control circuit is applied to the first SOA and the second SOA equalizes output burst frame powers regardless of input powers; the combination plays a key role in expanding the system operating range of long-reach systems. The first SOA with the simple gain control scheme can be also utilized as a preamplifier, which is useful to realize high-Splitting-Ratio systems without facing any electric supply issues. Unlike conventional burst frame power equalizers which change the gain of a single SOA through an FF control circuit and so do not provide a wide enough input dynamic range for PON applications, our gain control scheme successfully overcomes this issue. It improves the accuracy of output power equalization by reducing the input power range to the second SOA. We develop a prototype that implements this scheme and experimentally confirm that it can expand the system operating range of both long-reach and high-Splitting-Ratio systems. Although we have only one prototype at this time, experiments and discussions that consider the presence of neighbouring WDM channels support the possibility of WDM opeRations.
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Long-Reach and High-Splitting-Ratio WDM/TDM-PON Systems Using Burst-Mode Automatic Gain Controlled SOAs
Journal of Lightwave Technology, 2016Co-Authors: Masamichi Fujiwara, Ryo KomaAbstract:This paper presents novel burst-mode automatic gain controlled semiconductor optical amplifiers (AGC-SOAs) that are utilized as one upstream channel of a repeater in long-reach time- and wavelength-division multiplexed passive optical networks (WDM/TDM-PONs). Two SOAs are cascaded in the AGC-SOAs to achieve high gain. Two-stage gain switching with a fast feed forward (FF) control circuit is applied to the first SOA and the second SOA equalizes output burst frame powers regardless of input powers; the combination plays a key role in expanding the system operating range of long-reach systems. The first SOA with the simple gain control scheme can be also utilized as a preamplifier, which is useful to realize high-Splitting-Ratio systems without facing any electric supply issues. Unlike conventional burst frame power equalizers which change the gain of a single SOA through an FF control circuit and so do not provide a wide enough input dynamic range for PON applications, our gain control scheme successfully overcomes this issue. It improves the accuracy of output power equalization by reducing the input power range to the second SOA. We develop a prototype that implements this scheme and experimentally confirm that it can expand the system operating range of both long-reach and high-Splitting-Ratio systems. Although we have only one prototype at this time, experiments and discussions that consider the presence of neighbouring WDM channels support the possibility of WDM opeRations.
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high Splitting Ratio wdm tdm pons using automatic gain controlled soas designed for central office use
Optical Fiber Communication Conference, 2015Co-Authors: Masamichi Fujiwara, Ryo Koma, Katsuhisa TaguchiAbstract:Our AGC-SOAs implement a modified gain control scheme that effectively increases Splitting Ratio even if they are located in central office; they provide network operators with significant benefits from the viewpoint of CAPEX and ????.
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OFC - High-Splitting-Ratio WDM/TDM-PONs using automatic gain controlled SOAs designed for central office use
Optical Fiber Communication Conference, 2015Co-Authors: Masamichi Fujiwara, Ryo Koma, Katsuhisa TaguchiAbstract:Our AGC-SOAs implement a modified gain control scheme that effectively increases Splitting Ratio even if they are located in central office; they provide network operators with significant benefits from the viewpoint of CAPEX and ????.
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High-Splitting-Ratio PON systems using a PLC-based funnel-shaped waveguide with dual-mode fiber [invited]
Journal of Optical Communications and Networking, 2014Co-Authors: Masamichi Fujiwara, Ken-ichi Suzuki, Manabu Oguma, Shunichi Soma, Naoto YoshimotoAbstract:This paper increases the Splitting Ratio of 10 Gb/s-class passive optical network (PON) systems by using a novel low-loss optical splitter based on single-mode (SM) to multimode (MM) coupling. It consists of a planar lightwave circuit (PLC)-based funnel-shaped waveguide (FW) and a dual-mode fiber (DMF) that supports both SM and MM propagation through its dual core configuRation. While conventional low-loss splitters based on a similar principle, called mode couplers or mode combiners (MCs), pass through only upstream signals, the proposed FW-DMF acts as a low-loss splitter for upstream and a conventional splitter for downstream despite its simple configuRation. Compared to conventional MCs, it greatly reduces the number of optical components required for an optical line terminal. Considering the more efficient use of existing infrastructures, we develop two types of FW-DMFs with branching Ratios of 4 and 16. Bit error rate measurements assuming 10 G-EPON systems show the ability of our prototypes to realize 128-split 10 Gb/s-class PON systems.
