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Convergence Components & Materials Research Laboratory

HOME > R&D > Convergence Components & Materials Research Laboratory > Photonic/Wireless Convergence Components Research Department > areas for Research & Development

areas for Research & Development

Study on Compound Semiconductor based

Overview

ETRI has been the national leading center of semiconductor technology for last 20 years and is now on the leading edge of compound semiconductor technologies. Recently, the research is targeted especially on GaN based high power MMICs and power amplifier modules for the applications of mobile infrastructures and military radars. InP based HEMT and MMICs will be developed for the next generation terahertz frequency applications. ETRI provides fabrication support in compound semiconductor area to domestic and international R&D group by developing new devices and MMICs and also provide fabrication supports of ETRI-developed commercial products to industry clients.

All R&D's are being conducted in a custom foundry level 3,600 sq. ft. clean-room laboratory dedicated solely for compound semiconductor device fabrication, which is fully loaded with many sophisticated equipments for processing, monitoring and characterizing up to 4-inch wafers. Laboratory equipments include 100 kV e-beam lithography, i-line stepper, inductively coupled plasma (ICP) etcher, plasma-enhanced chemical vapor deposition (PECVD), rapid thermal annealing, e-beam evaporator, and so on. Also RF measurement laboratory and package laboratory have been established for the vigorous research work.

In order to vitalize high frequency RF components industry by providing the basis for the development and commercialization schemes that not only further developing R&D prototypes to commercially viable ones but also providing fabrication services of multi wafer project shuttles, This study would at the same time provoke country-wise industry-academia-research cooperation system to help medium-to-small enterprises in this industry establish the thrust for the market penetration. Also, a hub for the industrial development will be provided and contribute to the assistance of industry’s marketing activities by establishing the relationship with product test/certification organizations and mass production facilities.

Study on Compound Semiconductor based

Study on Eye-safe Three-dimensional Laser Image

Overview

Three-dimensional laser image technology is one of strategic research areas as a key fundamental technology which cannot be covered by conventional sensors in the cutting-edge military and commercial applications. Especially when considered its versatile usages ranging from robot vision and autonomous navigation vehicle to the national defence applications which are also strongly related to the security of a nation, this technology has been gaining its importance more and more.

Most traditional approaches to detect three dimensional images in a very short distance are mainly based on a silicon photo-detector. It means that those cannot be efficient to detect the eye-safe wavelength (~1.5 μm), resulting several critical limitations to be adapted in specific applications. Since there have been some reports about the superior properties of eye-safe wavelength (~1.5 μm) in the military applications as well as the safety issues in the car autonomous navigation applications, the eye-safe wavelength will be a key factor in the research area of the three-dimensional laser image technology.

Under these circumstances, the eye-safe three-dimensional laser image technology is strategically located in both of the market-driven arena and technology-driven arena. However, simultaneously, since it also has strong relations to the key military applications which can be easily threaten the security of one nation, the barrier of this technology between nations has been kept high to protect their national security, and most components at various hierarchical levels cannot be exported in any case. Consequently, this kinds of researches have been developed in each national project separately.

Meanwhile, since the traditional silicon-based photodetector cannot provide a efficient way to detect the eye-safe wavelength, skilled and proficient research backgrounds on the compound process and device are required to develop the high sensitivity photodetector to detect a light in a single-photon-level. Our research environments including researcher with various technological backgrounds and experiences on the compound semiconductor and optoelectronics, enables us to proceed this research area in a exceptionally efficient way.

Consequently, in this research, utilizing the various fabrication experiences and knowledges about optoelectronics applications in an eye-safe wavelength, the FPA module with the very high sensitivity are obtained in the early stage of the research, and simultaneously the seemless integration and optimization will be followed to proof the ability of the developed high-gain FPA and the optimization of each parameters in the full structure design of three-dimensional image technology. It means that the optimization of the whole system, not a single FPA module, and represents our core system design ability to adopt the developed technology to various industrial applications.

Especially, the developed high-sensitivity detector in this research area effects not only on the eye-safe three-dimensional laser image applications, but also some strongly related industries as well. Among several industrial applications, the detectors in extremely expensive medical equipments such like SPECT (Single Photon Emission Computed Tomograph) and PET (Positron Electron Tomograph) are expected to be replaced due to the drawbacks of the currently used detectors. Besides those, since the high sensitivity detector can be also utilized in quantum cryptograph and communications between planets in the near future, the single-photon-level photodetector, the kernel of eye-safe three-dimmensional laser image technology, are itself an invaluable technological element in the sense of its applicability and value.

Study on Eye-safe Three-dimensional Laser Image

Coherent Optical Orthogonal Frequency Division Multiplexing

Overview

There are increasing demand for high speed trasmission technology up to 100Gbps because various IT devices are widely used. Coherent optical orthogonal frequency division multiplexing (CO-OFDM) draws attension as a next-generation technology for high-capacity data transmission. In this research we have target of developing both key components and test-bed for CO-OFDM.

Until now OOK(On-off keying) has been mainly used for modulation. However, as DP-QPSK(dual-polarization quadrature phase-shift keying) is used in CO-OFDM, different optical components are required such as QPSK phase modulator, coherent receiver, polarization splitter, etc. In addition, DSP algorithm and high-speed DAC/ADC for data processing are indispensible both in transmitter and receiver in order to configure the total CO-OFDM system. This research is performed with the cooperation of Alcatel-Lucent Bell Laboratories to develop all the key technologies for components and CO-OFDM system. CO-OFDM test-bed will be constructed with the products of this project. Through the project, many IPR's are expected to be obtained.

Coherent Optical Orthogonal Frequency Division Multiplexing

Study on key devices for optical internet network

Overview

A variety of researches are in progress to establish technologies which are necessary to realize key optical devices for the next-generation high speed optical network with enormous capacity. As high capacity is demanded in the metro-nework, DWDM(Dense Wavelength Division Multiplexing) is adopted to increase the efficiency of the optical transport. As shown in the figure, the optical ADD/DROP functionality is installed at the nodes in the ring network architecture. The intellectual optical switch is needed for high capacity, as the optical path in the link can be remotely controled. ROADM (reconfigurable Optical Add Drop Multiplexer) optical switch with these functionalities is a key device in the optical ring network.

The following figure shows the developed ROADM optical switch. It consisted of AWG(Arrayed Waveguide Grating) for optical Mux/DeMux, 40channel optical switches, VOA(variable optical attenuator), monitor PD, etc. Automatic controller and firmware were equipped for remote-controling, too.

As the traffic of optical network rapidly increases, it is crucial to upgrade the network speed in ONU. To upgrade FTTH network, we are developing various optical devices operating in the range of 2.5~10Gbps. As FTTH generically represents the networks that use optical fiber to replace all part of the usual copper wire used for last mile network, there are a diversity of devices which should be upgraded. The figure shows the relation between developing/developed devices and optical network.

Study on key devices for optical internet network

Study on Advanced LED and Laser Technology

Overview

LED chips and packaged modules as well as high power lasers are key devices for next generation green technologies such as lightening, display, mobile industry, and medical care. We are committing multiple research projects to develop high efficiency and high power light sources that are essential components in the next green-growth industries.

Initial efforts in LED are toward basic researches that identifying the origin of a big unsolved issue of " droop ", and improving LED efficiencies through new epi design, chip and packaged module fabrications. For their applications in next generation lightening, high resolution display, mobile device, and medical care, we are improving several LED performances that needed in the real system demonstrations. For realizing intelligent green road lightening system in public domain, a remote control system based on wireless communications is testing to achieve the energy saving. Additional LED based new device developments are being conducted on medical care instruments, flexible display panels and flexible touch sensors in order to achieve novel original performances to fit the green issues.

High power laser technology has been employed in various applications such as industry, military and medical fields. Especially, high power lasers based on semiconductor technology are compact, operate with low maintenance costs over conventional lasers. ETRI is researching arrayed laser diode sources based on quantum dot technologies that emitting high power with good temperature stability, and also developing high power fiber lasers that converting their beam into better qualities, and converting operation wavelengths. The high power fiber laser can be applied for realizing a 3 dimensional image, cutting and welding for high precision, and medical surgery and therapy. For the high power fiber laser, ETRI has been already developed a pump beam combiner, and then developing the high power laser with industry.

Study on Advanced LED and Laser Technology

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