• Journal of the Optical Society of Korea
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• 제5권1호
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• pp.20-24
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• 2001

Non-destructive measurement of zero-dispersion wavelength variation in a dispersion shifted fiber by four-wave mixing technique is carried out. The oscillatory behavior of the four-wave mixing efficiency is utilized for the measurement of the linear dispersion slope and zero-dispersion wavelength. A simple formula useful for engineering estimation of the characteristics of fiber four-wave mixing efficiency is presented.

• Journal of the Optical Society of Korea
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• 제1권2호
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• pp.94-99
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• 1997

In this paper, we calculate the four coefficients for the quantum theory of multiwave mixing including a local-field correction resulting from dipole-dipole interactions. We make contact with the semiclassical calculations of probe absorption and four-wave-mixing coupling coefficients, and illustrate the effects of local field corrections on resonance-fluorescence and coupled-mode-fluorescence spectra. The method uses the hybrid quantum-Langevin-equation master-equation approach of An and Sargent.

• 한국진공학회지
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• 제12권S1호
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• pp.7-9
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• 2003

Solid-state reactions in Ni/Si multilayered films (MLF) with an overall stoichiometry of $Ni_2Si$, NiSi and $NiSi_2$, induced by ion-beam mixing (IBM) and thermal annealing, were studied by using spectroscopic ellipsometry and magneto-optical spectroscopy as well as x-ray diffraction (XRD). The mixing was performed with Ar+ ions of an energy of 80 keV and a dose of $1.5 x\times10^{16}$ $Ar^+$/$\textrm{cm}^2$. It was shown that the IBM induces structural changes in the Ni/Si MLF, which cannot be detected by XRD but are confidently recognized by the optical method. A thermal annealing at 673 K of the Ni/Si MLF with an overall stoichiometry of NiSi and $NiSi_2$ causes formation of the first η -NiSi phase. The first trace for $NiSi_2$ phase on the background of NiSi one was detected by XRD after an annealing at 1073 K while, according to the optical results, $NiSi_2$ turns out be the dominant phase for the annealed Ni/Si MLF with an overall stoichiometry of $NiSi_2$.

• 한국광학회지
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• 제14권2호
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• pp.175-183
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• 2003

Kerr 매질로 구성된 비선형 간섭계의 파라메트릭 증폭을 자기위상변조(self-phase modulation)를 이용하여 구하고, 사광자혼합(four-wave mixing)의로 구한 것과 등가임을 보여 파라메트릭 이득 발생에 적합함을 보였다. 또한 빛의 전파 거리에 대한 파워 이득의 변화율을 구하여 비선형 팔의 길이에 따라 이득이 포화됨을 보이고, 파라메트릭 증폭의 대역폭 특성을 비축퇴사광자혼합(nondegenerated four-wave mixing)을 통해 분석하였다. 수치해석을 통해 자기위상변조로 구한 파라메트릭 증폭의 여러 특성을 분석하여, 전광증폭기(all-optical amplifier)와 같은 전광소자의 분석 및 설계에 적용될 수 있음을 보였다.

• Journal of the Optical Society of Korea
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• 제18권6호
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• pp.639-645
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• 2014

In this paper, the scheme of a single module for simultaneous operation of all-optical computing circuits, namely half adder and half subtractor, are realized using semiconductor optical amplifier (SOA) based logic gates. Optical XOR gate by employing a SOA based Mach-Zehnder interferometer (MZI) configuration is used to get the sum and difference outputs. A carry signal is generated using a SOA-four wave mixing (FWM) based AND gate, whereas, the borrow is generated by employing the SOA-cross gain modulation (XGM) effect. The obtained results confirm the feasibility of our configuration by proving the good level of quality factor i.e. ~5.5, 9.95 and 12.51 for sum/difference, carry and borrow, respectively at 0 dBm of input power.

• 전자공학회논문지D
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• 제35D권8호
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• pp.69-75
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• 1998

We demonstrate wavelength conversion of 2.5Gb/s optical signals by four-wave mixing (FWM) in a semiconductor optical amplifier (SOA). We investigate the effect of input pump and signal powers on the coversion efficiency, optical signal-to-noise ratio (OSNR) and extinction ratio to be a measure of performance in a wavelength converter. As a result, we show that the maximum bit error rate (BER) performance can be obtained by co promising among high-vonversion efficiency (minimum Pprobe), high-OSNR (maximum Pprobe) and low-cross-gain saturation effects (Pprobe kept at least 6dB weaker than Ppump). In our experiment, we obtain optimum performance at +3 dBm pump power and -6dBm signal power. The power penalty incurred in the wavelength conversion can be minimized by careful selection of the input pump and signal powers. We show that about 0.5dB power penalty for 3.2nm wavelength coversion at 10-10 BER is achievable.

• 한국광학회지
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• 제8권1호
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• pp.63-67
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• 1997

분산천이 광섬유를 이용하는 등간격 다채널 광전송 시스템에서 광섬유의 4광파혼합이 전송품질에 미치는 영향에 대하여 실험적으로 고찰하였다. 4광파혼합의 효율을 최소화하기 위해 편광조절기를 사용하여 인접한 채널 간의 편광상태가 서로 직교하도록 하였다. 이 경우 채널들의 편광이 일정하게 정렬된 경우와 비교하여 전송시 전력 페널티가 1.5dB 감소되었다.

• 한국광학회:학술대회논문집
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• 한국광학회 2004년도 하계학술발표회
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• pp.192-193
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• 2004

• 한국광학회:학술대회논문집
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• 한국광학회 1999년도 제16회 광학 및 양자전자 학술발표회Proceedings of 16th Optics and Quantum Electronics Conference, 1999
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• pp.96-97
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• 1999

• ETRI Journal
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• 제23권3호
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• pp.106-110
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• 2001

Subpicosecond all-optical switching method based on the simultaneous two-photon coherence exchange is proposed and numerically demonstrated. The optical switching mechanism is based on the optical field induced dark resonance swapping via nondegenerate four-wave mixing processes. For potential applications of ultrafast all-optical switching in fiber-optic communications, 10-THz channel number independent quantum router is discussed.