• Current Optics and Photonics
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• 제4권4호
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• pp.310-316
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• 2020

We propose and experimentally demonstrate an all-optical radio frequency (RF) spectrum broadening system based on time compression. By utilizing the procedure of dispersion compensation values, the frequency domain is broadened by compressing the linear chirp optical pulse which has been multiplexed by the radio frequency. A detailed mathematical description elucidates that the time compression is a very preferred scheme for spectrum broadening. We also report experimental results to prove this method, magnification factor at 2.7, 8 and 11 have been tested with different dispersion values of fiber, the experimental results agree well with the theoretical results. The proposed system is flexible and the magnification factor is determined by the dispersion values, the proposed scheme is a linear system. In addition, the influence of key parameters, for instance optical bandwidth and the sideband suppression ratio (SSR), are discussed. Magnification factor 11 of the proposed system is demonstrated.

• 한국광학회:학술대회논문집
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• 한국광학회 2002년도 제13회 정기총회 및 2002년도 동계학술발표회
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• pp.58-59
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• 2002

Jitter noise power at the all optical packet header processor, which uses a fiber-optic delay-line matched filter, has been calculated for various optical pulse shapes.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2002년도 춘계학술대회 논문집 디스플레이 광소자 분야
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• pp.112-113
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• 2002

Optical bistability can be applied to the optical logic. optical signal processing and optical memory. We have measured the optical bistability of DFB-SOA and demonstrated all-optical OR logic gate using switching characteristics of DFB-SOA.

• Journal of the Optical Society of Korea
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• 제20권6호
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• pp.698-703
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• 2016

We report a new all-optical flip-flop (AOFF) with a quite simple structure, using optical beating in an injection-locked Fabry-Perot laser diode (FP-LD) with optical bistability. While conventional AOFF methods using an injection-locked FP-LD require additional devices such as secondary FP-LDs or polarization controllers for reset operation, the proposed method can be implemented using only a single commercially available FP-LD with set and reset signals. The optical beating induces intensity fluctuations inside the FP-LD, and releases the locking state to the reset state. Even though we demonstrated the AOFF at 100 Mbit/s, we expect that its operation rate could extend to 10 Gbit/s, according to the limit of the FP-LD's frequency response.

• Journal of the Optical Society of Korea
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• 제19권5호
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• pp.437-443
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• 2015

In this paper, we analyze the performance of the all-optical multihop radio over a free space optical (RoFSO) communication system with amplify-and-forward (AF) relays under varying weather conditions. The proposed channel model considers the propagation loss, attenuation and atmospheric fading modeled by the Gamma-Gamma (GG) distribution. Both the amplified spontaneous emission (ASE) noise in the all-optical relays and the background noise projected onto receiver apertures have been considered in the analysis. The lower bound analytical expressions for the end-to-end bit error rate (BER) and outage probability are derived for the multihop system employing the all-optical relays with the full channel state information (CSI). Meanwhile, the exact results for BER and outage probability are obtained via Monte Carlo simulation. Results indicate the performance of the proposed system will be improved by the multihop transmission technology. For a fixed number of relays, the BER and outage probability will be increased with the deterioration of the weather conditions.

• Current Optics and Photonics
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• 제3권3호
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• pp.227-235
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• 2019

With slimmer, lighter and all-reflective imaging systems in high demand for consumer and military applications, coaxially folded optical image systems are widely considered because they can extend focal length and reduce track length. Most of these systems consist of multiple surfaces, and these surfaces are machined on one element or grouping processing on two elements. In this paper, we report and first experimentally demonstrate an all-aluminum all-reflective optical system which consists of two optical elements, with two high order aspherical surfaces in each element. The coaxially folded system is designed with Seidel aberration theory and advanced optimization with Zemax. The system is made of all-aluminum material processing by single point diamond turning (SPDT). On this basis, we completed the system integration and performed an imaging experiment. The final system has the advantages of short track length and long focal length and broad application prospects in the micro-unmanned aerial vehicle field.

• Journal of the Optical Society of Korea
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• 제12권1호
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• pp.52-56
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• 2008

An all-optical read only memory utilizing cross gain modulation in semiconductor optical amplifiers (SOAs) has been demonstrated for the first time to our knowledge. In our demonstration, an all-optical 2-to-4 line decoder constructed with SOAs has been employed for the construction of this all-optical read only memory. Storing four characters in an American standard code for information interchange (ASCII) format has been successfully carried out. Each character consisting of seven binary bits could be read out at a rate of 10 Giga characters per second.

• 한국광학회지
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• 제14권5호
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• pp.530-534
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• 2003

새로운 전광(all-optical) NOR논리소자가 반도체 광증폭기 (SOA)의 이득포화 특성을 이용하여 처음으로 제안되고 입증되었다. 전광 NOR논리소자는 이득의 비선형성에 의해 동작되므로 SOA의 이득포화를 충분히 얻기 위해 펌프신호는 SOA의 입력단에서 어븀 첨가 광섬유 증폭기에 의해 증폭되었다. 전광 NOR 논리소자의 동작특성은 10 Gbit/s에서 성공적으로 측정되었다.

• 한국광학회지
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• 제13권1호
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• pp.84-87
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• 2002

SOA (Semiconductor Optical Amplifier)의 inverter 원리를 응용하여 RZ 형식의 전광 XOR논리소자가 5 Gb/s 속도에서 처음으론 구현되었다. 먼저 Boolean AB와 Boolean AB가 실험적으로 구현되었으며 전광 XOR논리소자를 만들기 위해서 AB와 AB를 합하여 XOR의 Boolean 값인 AB+AB의 특성이 얻어졌다.

• 한국광학회지
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• 제23권4호
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• pp.143-146
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• 2012

본 논문에서는 반도체 광 증폭기(Semiconductor Optical Amplifier)의 교차 진폭 변조 현상을 이용하여 광 컴퓨팅이나 광통신에서 데이터의 패킷 교환, 데이터 리셋 혹은 추가나 제거에 필수적인 전광 데이터 추출을 시뮬레이션하고 실험적으로 구현하였다. 전광 데이터 추출의 실험적 시뮬레이션에는 상용 프로그램인 VPI Tool을 사용하였으며 기본적으로 두 개의 반도체 광 증폭기(SOA)를 사용하여 AND 논리를 구성한 후 이를 이용하여 데이터를 추출하였다. 또한 높은 집적성과 효율로 고속으로 연산할 수 있는 가능성을 확인하였다.