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2.5 Gbps 광통신용 Distributed Feedback Laser Diode(DFB - LD) 모듈 제작 및 광송신 실험
박경현(K. H. Park),강승구(S. G. Kang),송민규(M. K. Song),이중기(J. K. Lee),조호성(H. S. Cho),장동훈(D. H. Jang),박찬용(C. Y. Park),김정수(J. S. Kim),김홍만(H. M. Kim),박형무(H. M. Park),한정희(J. H. Han),심창섭(C. S. Shim) 한국광학회 1994 한국광학회지 Vol.5 No.3
DFB-LD 칩으로부터 단일모드 광섬유 부착 2.5 Gbps 광통신용 광원인 DFB-LD 모듈을 설계, 제작하였다. DFB-LD 모듈은 광 isolator가 삽입된 2 렌즈 quasi confocal 광학계로 구성된 원통형 서브 모듈과 14 pin butterfly 패키지가 분리된 구성으로서 이들 사이의 전기적 연결은 bias-T 회로가 형성된 하이브리드 기판으로 이루어지도록 설계하였다. 모듈 제작시 정밀한 부품 고정이 요구되는 서브 모듈 조립에는 레이저 웰딩 방법을 사용하였다. 제작된 DFB-LD 모듈은 광결합 효율 20%, -3dB 소신호 변조 대역폭 2.6 ㎓ 이상의 특성을 가졌으며, 온도 순환검사에도 10% 이내의 광출력 변동만을 보임으로써 기계적 신뢰성을 확인할 수 있었다. 제작된 DFB-LD 모듈의 광송신 성능을 실제 2.5 Gbps 광통신 시스템의 광원으로 적용하여 평가한 결과 47 ㎞의 광섬유 전송시 BER 1×10^(-10) 조건에서 최대 -30.2 dBm의 수신감도를 얻었으며, 이 때 전송페널티는 소광비에 의한 것이 1.5 dB, 분산에 의한 것이 1.0 dB로 나타났다. We designed and fabricated the single mode fiber pigtailed DFB-LD module for 2.5 Gbps optical communication system. In the design of the DFB-LD module, we made the module divided into two parts of inner sub-module and outer 14-pin butterfly package and cylindrical shaped sub-module contain quasi confocal 2 lens system including optical isolator and electrical connection between these parts via hybrid substrate of bias T circuit.<br/> Laser welding was used to assemble the sub-module which requires accurate fixing between optical elements. The fabricated DFB-LD module showed optical coupling efficiency of 20% and -3 dB small signal response of more than 2.6 ㎓. We confirmed mechanical reliability of the module by temperature cycle test where the tested module exhibit optical power fluctuation of less than 10%. Finally we evaluated the performance of the fabricated DFB-LD module as light source of 2.5 Gbps optical communication system, sensitivity of -30.2 dBm was obtained through 47 ㎞ optical fiber transmission under the criterion of 1×10^(-10) BER and transmission penalties were 1.5 dB caused by extinction ratio and 1.0 dB caused by chromatic dispersion of normal single mode fiber.
테라헤르츠파 기반 대인 보안검색 기술의 동향과 발전 전망
이일민,이의수,김무건,최다혜,박동우,신준환,김영호,김정수,조진철,김영훈,조성우,곽동용,박경현,Lee, I.M.,Lee, E.S.,Kim, M.G.,Choi, D.H.,Park, D.W.,Shin, J.H.,Kim, Y.H.,Kim, J.S.,Cho, J.C.,Kim, Y.H.,Jo, S.,Kwak, D.Y.,Park, K.H. 한국전자통신연구원 2022 전자통신동향분석 Vol.37 No.2
Terahertz electromagnetic waves are considered the waves for the next generation of security checking technology. They can penetrate opaque materials, such as plastics, fibers, papers, and leathers. In addition, they are harmless to humans they cannot penetrate human skins. Moreover, because their frequencies are higher than those of millimeter waves, higher resolution and more detailed information is expected than the millimeter wave-based technologies In this study, we describe the trends and prospectives of terahertz technology as security checking technology that can be directly applied to a human body.
김현수,이의수,박동우,이일민,문기원,최다혜,신준환,김무건,최경선,박경현,Kim, H.S.,Lee, E.S.,Park, D.W.,Lee, I.M.,Moon, K.,Choi, D.H.,Shin, J.H.,Kim, M.G.,Choi, K.S.,Park, K.H. 한국전자통신연구원 2019 전자통신동향분석 Vol.34 No.3
The bandwidth of wireless communication is expected to grow exponentially due to the expansion of mobile devices and the increase of real-time and realistic multimedia services. Recently, the studies on terahertz band wireless communication have been actively conducted for the next generation communication after 5G wireless communication. The terahertz band, which is the unallocated frequency band, has been applied to the non-contact, non-destructive quality inspection industry such as the terahertz imaging and spectral systems through the development of terahertz generating and detecting components. This article briefly describes recent research trends on terahertz wireless communication technologies and introduces the details of photonics-based terahertz devices and systems that have been focused on the Terahertz Basic Research Section of Electronics and Telecommunication Research Institute.
최다혜,신준환,이의수,문기원,이일민,박동우,김현수,김무건,최경선,박경현,Choi, D.H.,Shin, J.H.,Lee, E.S.,Moon, K.W.,Lee, I.M.,Park, D.W.,Kim, H.S.,Kim, M.G.,Choi, K.S.,Park, K.H. 한국전자통신연구원 2019 전자통신동향분석 Vol.34 No.5
Modern imaging technologies utilizing electromagnetic waves are indispensable in our daily lives. Applications, such as television and smartphone screens, radar imaging for weather forecast, and medical imaging, can be attributed to technology developments in various electromagnetic regions. Terahertz (THz) waves, electromagnetic (EM) waves located between far infrared and microwave regions, had left unexplored EM waves. Recent advances in technology have led to various two-dimensional and three-dimensional THz imaging techniques. In this article, we explain THz imaging techniques as well as the experimental results from our laboratory. Additionally, we introduce commercial THz cameras developed worldwide. Finally, we present the applications of THz imaging techniques.
김무건,이의수,박동우,최다혜,이일민,신준환,김영호,김정수,조진철,김영훈,곽동용,박경현,Kim, M.G.,Lee, E.S.,Park, D.W.,Choi, D.H.,Lee, I.M.,Shin, J.H.,Kim, Y.H.,Kim, J.S.,Cho, J.C.,Kim, Y.H.,Kwak, D.Y.,Park, K.H. 한국전자통신연구원 2021 전자통신동향분석 Vol.36 No.3
The terahertz wave (THz wave) is a band between infrared and microwaves and is defined as an electromagnetic wave having a frequency of 0.1 to 10 THz band. THz waves have the property of transmitting nonpolar materials, which the visible light cannot be transmitted, such as ceramics, plastics, and paper; and the photon energy is low, such as several meV. For this reason, non-destructive testing equipment based on THz imaging technology can be applied to the industrial field. Recently, THz imaging technology was applied in wide industrial fields, such as automobiles, batteries, food, medical, and security, and being actively studied. In this paper, we describe the research trends of terahertz imaging technology and experimental results. Furthermore, we summarize the recent commercialized terahertz camera. Finally, we present the research results in the field of the human security scanner system.
신준환,최다혜,이의수,문기원,박동우,주경일,김무건,최경선,이일민,박경현,Shin, J.H.,Choi, D.H.,Lee, E.S.,Moon, K.W.,Park, D.W.,Joo, K.I.,Kim, M.G.,Choi, K.S.,Lee, I.M.,Park, K.H. 한국전자통신연구원 2020 전자통신동향분석 Vol.35 No.4
The terahertz (THz) region lies in between the millimeter and infrared spectral bands. A THz wave has the characteristics of non-invasiveness and non-ionization due to low photon energies, while having high penetrability in dielectrics. In addition, since the resonance frequencies of various molecules are included in the THz band, research on the application of spectral analysis and non-destructive testing has been widely studied. Towards this end, the research and development of THz detectors has become increasingly important in order to assess their applications in different areas such as astronomy, security, industrial non-destructive evaluations, biological applications, and wireless communications. In this report, we summarize the operating principles, characteristics, and utilization of various broadband technologies in THz detection devices. Further, we introduce the development status of our Schottky barrier diode technology as one of the broadband THz detectors that can be easily adopted as direct detectors in many fields of applications.