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백용순,Baek, Yongsoon 한국광학회 2013 한국광학회지 Vol.24 No.6
With the explosive growth of internet data traffic due to the FTTH penetration, prevalence of smart devices and cloud network service, the demand for higher bandwidth is ever increasing with the pace of more than 40% annual growth. To accommodate ultra high bandwidth traffic, optical components in each hierarchy have progressed rapidly. WDM has begun to be deployed along with higher bandwidth service in the access network. Next-generation ROADM is under development for efficient network management in the metro network. For long-haul transmission, an advanced modulation scheme based on coherent transmission technology has been adopted to enhance spectral efficiency. In this paper, core components to meet the demands of high speed, high efficiency and low power consumption will be reviewed. 스마트 기기, 클라우드 서비스, 광가입자망 등의 보급에 따른 멀티미디어 기반의 대용량 인터넷 트래픽의 급속한 증가로 통신 수요는 연 40%이상씩 증가하고 있다. 이러한 대역폭 증가를 수용하기 위해서 광통신용 광부품의 진화도 각 계층별로 빠르게 진행되고 있다. 가입자망에서는 변조속도 증가와 더불어 파장다중방식의 도입이 시작되고 있고, 매트로망에서는 보다 효율적인 망 운용을 위해 차세대 ROADM에 대한 개발이 진행중이며, 장거리 통신에서는 코히어런트 통신 기반의 새로운 변조방식이 도입되어 스팩트럼 효율을 향상시키고 있다. 본 논문에서는 이러한 폭발적인 통신 대역폭 증가 요구에 따른 광통신망의 진화와 이를 수용하기 위한 고속화, 효율화, 저전력화로 발전하고 있는 핵심 광부품에 대해 살펴본다.
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백용순,Baek, Y.S. 한국전자통신연구원 2009 전자통신동향분석 Vol.24 No.6
인터넷의 보급과 더불어 폭발적으로 늘어나기 시작한 데이터 통신은 FTTH의 보급과 IPTV, VoD 등 본격적인 멀티미디어 수요의 증가에 따라 매 18개월마다 통신량이 2배씩 증가하는 "광 무어의 법칙"이 성립되고 있다. 지속적인 대역폭의 증가를 수용하기 위해서는 핵심 광부품의 소형화 및 저가화가 반드시 필요하며 이러한 요구사항 수용을 위한 핵심요소는 광집적화 기술 개발을 통한 광소자의 고집적화 및 고속화 달성이다. 광집적화 기술은 크게 두 가지 분류로 나눌 수 있는데 이종 물질간의 하이브리드결합에 의한 구현과 단일 혹은 유사 물질에 의한 모놀리식 집적에 의한 방법이다. 본 고에서는 하이브리드 집적 및 모놀리식 집적 기술의 핵심 요소 및 기술발전 현황에 대해 살펴본다.
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白鏞舜,이진무 中央醫學社 1964 中央醫學 Vol.6 No.2
3 Cases of cryptorchism treated surgically are presented. All cases were treated with gonadotrophin, at first, respectively 6,000 IU, 7,000 IU and 27,000 IU in doses. The first case was resulted to slight descent, the second case was nonresponse and the third case with marked descent, But there were never complete descent into the scrotum. The first and third cases were bilateral and the second case was unilateral(Left). All cases were treated surgically by Bevan's technic(Orchiopexy). In review of the literatures, it is emphasized that orchiopexy dose not decrease the incidence of the malignant change and biopsy of the testicle is important for evaluating the ability of fertilization, and also orchiopexy is not done for preventing the malignant change but promoting the fertilizing ability.
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白鏞舜,張祥範,이진무 中央醫學社 1963 中央醫學 Vol.5 No.3
A case of partent urachus is presented with its review of literatures. It is the second case reported in Korea, the first case reported by Yonsei University. Medical School in June, 1960. It was associated with other congenital anomalies such as agenesis of gher left kidney, ureter and trigon of the bladder, and tuberculous infection in the urachus. Embryologically, it is considered that the urachus is probably originated from the cloaca rather than allantois.
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Self-Pulsation in Multisection Distributed Feedback Laser Diode with a Novel Dual Grating Structure
박경현,백용순,김동철,심은덕,Young Ahn Leem,Dae-Su Yee,김성복 한국전자통신연구원 2003 ETRI Journal Vol.25 No.3
A self-pulsating multisection distributed-feedback laser diode (DFB LD) can potentially realize all-optical clock extraction. This device generally consists of three sections, two DFB sections and one waveguide section. The most important variable in this device is detuning, which is the relative spectral position between the stop bands of two DFB sections. We fabricated a novel structure in which two gratings were located one over and one under the active layers. Each grating structure was independently defined in processing so that detuning, which is the prerequisite for self-pulsation, could be easily controlled. Observing various self-pulsating phenomena in these devices under several detuning conditions, we characterized the phenomena as dispersive Q-switching, mode beating, and self-mode-locking.
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권오기,백용순,정윤철,박형무 한국전자통신연구원 2013 ETRI Journal Vol.35 No.3
A novel integrated laser, that is, a distributed reflector laser diode integrated with an electroabsorption modulator, is proposed to improve the output efficiency, single-mode stability, and chirp. The proposed laser can be realized using the selective metalorganic vapor phase epitaxy technique (that is, control of the width of the insulating mask), and its fabrication process is almost the same as the conventional electroabsorption modulated laser (EML) process except for the asymmetric coupling coefficient structure along the cavity. For our analysis, an accurate time-domain transfer-matrix-based laser model is developed. Based on this model, we perform steady-state and large-signal analyses. The performances of the proposed laser, such as the output power, extinction ratio, and chirp, are compared with those of the EML. Under 10-Gbps NRZ modulation, we can obtain a 30% higher output power and about 50% lower chirp than the conventional EML. In particular, the simulation results show that the chirp provided by the proposed laser can appear to have a longer wavelength side at the leading edge of the pulse and a shorter wavelength side at the falling edge.
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