A5041796624- Semiconductor Lasers and Optical Devices
- Optical Network Technologies
- Photonic and Optical Devices
- Advanced Optical Network Technologies
- Advanced Photonic Communication Systems
- Advanced Fiber Optic Sensors
- Photonic Crystal and Fiber Optics
- Metamaterials and Metasurfaces Applications
- Thin-Film Transistor Technologies
- Plasmonic and Surface Plasmon Research
- Liquid Crystal Research Advancements
- CCD and CMOS Imaging Sensors
- Photonic Crystals and Applications
- Semiconductor materials and interfaces
- Gas Sensing Nanomaterials and Sensors
- Horticultural and Viticultural Research
- Infrared Target Detection Methodologies
- Microwave Engineering and Waveguides
- GaN-based semiconductor devices and materials
- Optical Wireless Communication Technologies
- Image Enhancement Techniques
- Copper Interconnects and Reliability
- Advanced Sensor and Energy Harvesting Materials
- Nanomaterials and Printing Technologies
- Polydiacetylene-based materials and applications
NTT (Japan)
2015-2024
Keio University
2011-2019
NTT (United States)
2019
We demonstrate 1.01-Pb/s transmission over 52 km with the highest aggregate spectral efficiency of 91.4 b/s/Hz by using low-crosstalk one-ring-structured 12-core fiber. Our multi-core fiber and compact fan-in/fan-out devices are designed to support high-order modulation formats up 32-QAM in SDM transmission.
Image sensors play a critical role in current technologies ranging from smartphones to autonomous vehicles. In these technologies, high-sensitivity image are highly desired because they enable dark-scene/ultra-fast imaging. Unfortunately, conventional sensor architecture that employs color filters on every pixel fundamentally limits the detected light power per of filtering, which has been long-standing barrier sensitivity improvement. Here, we demonstrate polarization-insensitive...
We demonstrate bidirectional transmission over 450 km of newly-developed dual-ring structured 12-core fiber with large effective area and low crosstalk. Inter-core crosstalk is suppressed by employing propagation-direction interleaving, 409-Tb/s capacities are achieved for both directions.
We have achieved the longest three mode-multiplexed full C-band transmission yet attained over 3060 km. In wideband weakly-coupled fewmode fibers (FMFs), width of signal impulse responses is dependent on wavelength, and also exhibits a linear growth with increased distance because presence differential mode delay (DMD). Those properties are technically challenging issues for future deployable space division multiplexing (SDM) transport systems since they make system design complicated,...
Demonstrated is a fan‐out device using small diameter fibres for 7‐core singlemode multicore fibre, which realises compact size with ferrules and split sleeve, also achieves physical contact connection an average loss of 0.17 dB return exceeding 49 dB.
We propose a low-loss fan-out for 12-core multicore fiber, which achieves physical-contact connection between coupled cores by accurately arranging fibers and optimizing the conditions physical contact, demonstrate contact with low average insertion loss of 0.64 dB high return over 55 12 cores.
Proposed is a multi‐core fibre amplification method that can reduce crosstalk, in which the optical amplified signals two adjacent cores propagate opposite directions. By employing proposed method, confirmed crosstalk improvement of more than 4 dB using outer six seven‐core erbium‐doped fibre.
An optical coupling method with high alignment tolerance by self-written waveguide (SWW) formation is a promising candidate for co-packaged optics (CPO) silicon photonics (SiPh). However, conventional SWWs cannot be used Si waveguides because visible light SWW radiate from the facet. Here, we devised new, to best of our knowledge, circuit SiOxNy an SiPh chip. With circuit, achieved between chip and standard single-mode fiber (SSMF) tapered (TSWW). The lowest excess loss compared butt...
This paper describes a low-loss fiber-bundle-type fan-in/fan-out (FI/FO) device for 6-mode 19-core fiber, which exhibits low mode-dependent loss (MDL) with physical-contact connection all the cores. We reveal that reducing offset at of few-mode fibers (FMFs) butt coupling does not necessarily result in minimum MDL, and FMFs should be aligned so as to minimize by experimentally investigating MDL function lateral coupling. develop precise rotational alignment mechanism accurately adjust core...
We report on space-division multiplexing (SDM) transmissions of up to 400 Gb/s over a homogeneous four-core fiber using discrete multitone (DMT) modulation for intra-datacenter applications and 200/400 GbE links. The transmission system is enabled by compact, SDM-channel scalable, multi-core (MCF) pluggable, energy-efficient SDM transmitter composed 4-channel 1.3-μm membrane directly modulated laser (DML) array-on-silicon integrated with fiber-bundle type fan-in loss less than 1 dB...
We describe a physical-contact (PC) multicore fiber (MCF) connector with good optical characteristics. To achieve stable connection, we clarify the relationship between connector-end deformation and compression force spherical polished ferrule end structures using finite element analysis actual measurements. On basis of obtained relationship, demonstrate design approach that shows condition all cores simplex connector. In addition, criteria for low-loss connection by employing rotational...
We clarify the physical-contact conditions for multicore fiber connectors with good optical characteristics, and demonstrate a sufficiently high return loss of more than 40 dB all cores.
A fan‐in/fan‐out device using small‐diameter fibres for 12‐core single‐mode multicore fibre, which realises a hexagonal closely packed fibre arrangement by employing v‐groove substrates and low insertion loss is demonstrated.
We describe a new multicore fiber (MCF) receptacle for space division multiplexing (SDM) based transceiver applications, in which we integrated compact fiber-bundle type fanin/fan-out device directly connecting MCF to LDs and PDs.We design the length of fan-out fibers taking their bending stress into account achieve configuration with smaller footprint.With proposed receptacle, develop 100 Gb/s SDM transmitter on four-channel, 1.3 µm membrane laser array Si, spot-size convertor (SSC) using...
We propose a waveguide frontend with integrated polarization diversity optics for wavelength selective switch (WSS) array liquid crystal on silicon switching engine to simplify the free space configuration and alignment process in optical modules. The function is realized by integration of waveguide-type beam splitter rotating half-wave plate launcher using silica-based planar lightwave circuit technology. confirmed experimentally feasibility our proposed two-in-one 1 × 20 WSS. experimental...
We describe a multicore-fiber LC receptacle with compact fan-in/fan-out as new transceiver interface for connecting LDs and PDs. achieve low-loss coupling the between 4-core MCF laser array.
We demonstrate the longest three mode-multiplexed full C-band transmission over 3060 km. The cyclic mode permutation technique enabled DMD-unmanaged across 4.4-THz optical bandwidth FMF having DMD of > 33.7 ps/km.
A 4-channel wire-bond-free 3D-stacked transmitter module consisting of a 65-nm CMOS cascode shunt LD driver, 1.3-μm LD-array-on-Si, and LTCC interposer achieves simultaneous 25-Gbps error-free transmission over 1.2-km-long SSMF, with power consumption 2.67 mW/Gbps.
We demonstrate 4×56-GBaud PAM-4 signals over 125-μm-cladding, 4-core fiber by simultaneous, direct modulation of four 1.3-μm membrane III-V-on-silicon lasers, each requiring <25-mWatts (@12 mA). A reach extension ~15x is achieved compared to previous works.
A new multiple multicore fibre (MCF) connector is presented that employs the compressive deformation of in a ferrule. This enables physical‐contact connection for all cores including outer ones with small compression force even if end has manufacturing errors. The been designed and fabricated 7‐core single‐mode MCF taking account relationship between structure force, it achieves physical contact loss below 0.7 dB return exceeding 54 dB.
The NTT laboratories have been researching and developing connection technology for multi-core fiber, which is expected to be the transmission medium in future high-capacity systems.In this article, we introduce a fiber connector that achieves physical-contact with low loss, pluggable fan-in/fan-out device connecting single-core fiber.
We describe a low-loss fiber-bundle-type fan-in/fan-out device for 6-mode 19-core fiber, which achieves physical-contact connection. suppress the mode-dependent loss of by accurately arranging fibers and utilizing precise rotational alignment mechanism.
We present a filter-free color image sensor utilizing full-color-sorting metalens array. Our demonstration shows the sensor’s ability to create high-quality images while enhancing pixel-signal levels compared with those of conventional sensors.