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Pump Light Power of Wideband Optical Phase Conjugator using HNL-DSF in WDM Systems with MSSI
이성렬,조성언,Lee Seong real,Cho Sung eun The Korean Institute of Communications and Informa 2005 韓國通信學會論文誌 Vol.30 No.3a
장거리 3×40 Gbps 파장 분할 다중 시스템에서 색 분산과 자기 위상 변조에 의해 왜곡된 광 펄스를 최상으로 보상할 수 있는 최적의 펌프 광 전력을 수치적 방법으로 살펴보았다. 광 펄스 왜곡 보상 기법으로 경로 평균 강도 근사를 채택한 MSSI (Mid-Span Spectral Inversion) 기법을 사용하였고, 전체 전송로 중간에서 MSSI를 수행하는 광 위상 공액기(OPC)의 비선형 매질로는 HNL-DSF(Highly-Nonlinear Dispersion Shifted Fiber)를 이용하였다. 광 대역 WDM 전송을 위한 OPC의 비선형 매질로는 HNL-DSF가 매우 유용하다는 것을 확인하였고, 최상의 보상을 위한 OPC의 펌프 광 전력은 OPC를 통해 두 번째 광섬유로 입사하는 공액파 광 전력이 WDM 채널의 입력 광 전력과 같아지도록 전체 전송 거리와 관련하여 선택되어야 한다는 것을 확인하였다. 또한 적은 변환 효율을 갖는 WDM 채널의 개선된 보상은 전력 변환비를 1 이상으로 증가시킬 수 있는 전력의 펌프 광을 이용해야 얻을 수 있다는 것을 확인하였다. In this paper, we numerically investigated the optimum pump light power resulting best compensation of pulse distortion due to both chromatic dispersion and self phase modulation (SPM) in long-haul 3×40 Gbps wavelength division multiplexing (WDM) systems. We used mid-span spectral inversion (MSSI) method with path-averaged intensity approximation (PAIA) as compensation approach, which have highly nonlinear dispersion shifted fiber (HNL-DSF) as nonlinear medium of optical phase conjugator (OPC) in the mid-way of total transmission line. We confirmed that HNL-DSF is an useful nonlinear medium in OPC for wideband WDM transmission, and in order to achieve the excellent compensation the pump light power is selected to equal the conjugated light power into the latter half fiber section with the input light power of WDM channel depending on total transmission length. Also we confirmed that compensation degree of WDM channel with small conversion efficiency is improved by using pump light power increasing power conversion ratio upper than 1.
성층권 비행선을 이용한 이동통신 시스템의 성능에 관한 연구
고봉진,김혜영,조성언,Ko Bong Jin,Kim Hye Young,Cho Sung Eun 한국융합신호처리학회 2000 융합신호처리학회 논문지 (JISPS) Vol.1 No.2
This paper presents the analytic results of outage probability, considering the effect of Rician fading, interference and interference-reduction techniques, when a mobile communication system was constructed by using Stratospheric platform, one of the next generation wireless communication infrastructure which provides high speed multimedia services. The results show that carrier to interference power ratio C/I and fading depth K have an effect on outage probability. That is, outage probability decreases as K value increases for constant C/I value and C/I value increases for constant K value.
송창훈,이슬희,오성원,정종진,김수연,이상민,조성언,선승호,황진우,백태현,Song, Chang-Hoon,Lee, Seul-Hee,Oh, Sung-Won,Jeong, Jong-Jin,Kim, Soo-Yeon,Lee, Sang-Min,Cho, Sung-Eun,Sun, Seung-Ho,Hwang, Jin-Woo,Baek, Tae-Hyun 대한한방내과학회 2007 大韓韓方內科學會誌 Vol.28 No.2
Objectives and Methods : Chronic pancreatitis is an inflammative disease characterized by both persistent and irreversible progression of pancreatic lesions that accompanies complications and pain which hinders everyday life activities. As the alcohol consuming population increases, chronic pancreatitis is increasing consequently. We retrospectively analyzed the medical record of a chronic pancreatitis patient who had been treated with oriental herbal medicine, acupuncture and moxibustion for 40 days. He complained of anorexia, fatigue, indigestion, weight loss, constipation, abdominal discomfort and pain. We prescribed him Daekumeumja, Bojungikgi-tang and other oriental herbal medicines in order to cure these symptoms. Results and Conclusion : For 40 days he was treated with oriental medicine and the symptoms mostly disappeared. When it comes to the therapeutic effects, it could be suggested that oriental medicine has significant effects on improving symptoms and qualities of lives.