• The KIPS Transactions:PartC
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• v.13C no.3 s.106
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• pp.311-316
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• 2006

We propose the optical sensor network using optical CDMA with bipolar receiver and modified Pseudorandom Noise codes which are widely used in the wireless communication network. We numerically analyze the performances in the optical sensor network. In the proposed network, multiple access interferences between two sensors are suppressed by performing synchronization between the optical encoder and the optical decoder and adjusting the delay times of optical delay lines. Numerical simulations confirm that the performance can be acquired by suppressing the beat noise among optical signals as the number of sensors increases.

• Proceedings of the KIEE Conference
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• 2001.07c
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• pp.1847-1849
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• 2001

본 논문에서는, 광통신에서 정보전송량을 극대화하기 위한 방법으로 WDM의 전송링크에 광 CDMA의 부호기와 복호기를 병합하여 WDM과 광 CDMA를 하이브리드 함으로써 전송용량을 극대화하는 방법을 제안하였다. 하이브리드 방법에는 초단펄스를 이용한 방법과 광지연 선로를 사용하는 방법이 있으나, 본 논문에서는 초단 펄스를 이용한 방법을 사용하여 적용하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2014.10a
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• pp.182-185
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• 2014

In this paper, the ADC performs research and development for high speed data transfers to minimize the optical delay. Have more $6{\mu}s$ delay in the data signal converting optical repeater transmission system existing there has been a limit on the high-speed data transmission, and signal conversion. The need to develop a new technique to reduce the delay in time within $2{\mu}s$ data signal converted by using this direct conversion system. It is desired the development of the core technologies necessary for the signal transduction component, such as mobile communications LTE, LTE advanced service transport network is established, the delay time $3{\mu}s$ technology for reducing the delay time in the signal converting a revolutionary step is applied in this paper we have developed an ADC.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1996.06a
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• pp.297-299
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• 1996

• Proceedings of the Optical Society of Korea Conference
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• 2006.07a
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• pp.395-396
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• 2006

• Journal of Internet Computing and Services
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• v.7 no.6
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• pp.113-121
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• 2006

To reduce switch cost, the optimum numbers of tunable wavelength converters (TWCs) and internal wavelengths required for contention resolution of asynchronous and variable length packets like internet traffics, is presented in the optical packet switch (OPS) with the shared fiber delay line (FDL) buffer. To optimize TWCs and internal wavelength related to on OPS design cost, we proposed a scheduling algorithm for the limited TWCs and internal wavelengths. For three TWC alternatives (not shared, partially shared, and fully shared cases), the optimum numbers of TWCs and internal wavelengths to guarantee minimum pocket loss are evaluated to prevent resource waste. Under o given load, TWCs and internal wavelengths could be significantly reduced, guaranteeing the same pocket loss probability as the performance of on OPS with full TWCs and internal wavelengths.

• Electronics and Telecommunications Trends
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• v.16 no.4 s.70
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• pp.1-13
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• 2001

광패킷 라우팅 방식 중 OBS(Optical Burst Switching)는 최근 IP over WDM 구현과 테라 비트 광라우터 구축을 위해 제안되는 해이다. OBS 광패킷 헤더 처리기는 광버스트 스위칭 망 기반의 광패킷 라우터에서 물리광 계층의 헤더 패킷을 인식하고 처리하기 위한 것으로 본 고에서는 코어용 광패킷 라우터의 제어장치인 광패킷 헤더 처리기의 설계에 관하여 고찰한다.

• Korean Journal of Optics and Photonics
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• v.16 no.3
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• pp.287-294
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• 2005

In this paper, an optical true time-delay (TTD) for two-dimensional (2-D) phased array antennas (PAAs), composed of a multi-wavelength optical source and a fiber optic delay line matrix consisting of $2\times2$ optical switches with optical fiber connected between cross ports, has been proposed. A 2-bit $\times4-bit$ optical TTD for 10-GHz 2-D PAAs has been implemented by cascading a wavelength dependent TTD (WD-TTD) and a wavelength independent TTD (WI-TTD). The unit time delay for WD-TTD and WI-TTD have been chosen as ${\Delta}T=12ps$ and $\Delta\tau=6ps$, respectively. Time delay have been measured at all radiation angles. The maximum delay error for WD-TTD was measured to be 3 ps due to jitter incurred from gain switching. For the case of WI-TTD, error was within ${\pm}\;1\;ps$. The proposed optical TTD for a 2-D PAA has the following advantages: 1) higher gain compared to one-dimensional linear PAAs, 2) stabilization of optical power and wavelength by using a multi-wavelength optical source, and 3) fast beam scan and simple operation due to electronic control of the $2\times2$ optical switches matrix on a column-by-column basis.

• Korean Journal of Optics and Photonics
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• v.12 no.1
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• pp.5-9
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• 2001

A wavemeter was realized using the phenomena that the phase lag between principal polarization states in an optical retarder is a function of wavelength. The change in the polarization state of the optical beam as it passes through the optical retarder is dependent on wavelength. The wavelength of the optical beam is determined by comparing the power difference between principal polarization states. A prototype wavemeter was successfully implemented using a polarization maintaining fiber with birefringence $3\times10^{-4}$ and length 100 mm as the optical retarder. The measurement resolution was 0.08 nm over a wavelength region of 1554.38 nm-1557.l9 nm, which agreed well with theoretically calculated results. In addition, the dependence of operating characteristics on temperature was analyzed theoretically and experimentally.mentally.

• Electronics and Telecommunications Trends
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• v.13 no.2 s.50
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• pp.1-9
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• 1998

고속 광 시스템에서 필요로 하는 광 재생 중계기, 시간 분할 스위칭 시스템이나 다중 분리화 회로 및 클럭 재생 기술이 필수적이다. 본 고에서는 고주파수 광 클럭 추출을 구현하기 위해서 활발히 진행되고 있는 광 클럭 재생 기술의 최근 개발 동향을 분석해 보고자 한다. 아직은 어느 하나도 완벽한 방법이라 할 수 없겠지만, 각 방법의 장단점을 헤아려 보고 구성하고자 하는 통신망에 적절한 광 클럭 재생기술을 채택하여 사용하는 것이 필요하리라 본다.