• 디지털산업정보학회논문지
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• 제7권2호
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• pp.59-65
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• 2011

All-optical signal processing is expected to offer advantages in speed and power consumption against over electronics signal processing. It has a potential to solve the bottleneck issues of ultra-high speed communication network nodes. All-optical serial-to-parallel and parallel-to-serial data converters would make it possible to easily process the serial data information of a high-speed optical packet without optical-to-electronic-to-optical data conversion. In this paper, we explain the principle of simple and easily expandable all-optical serial-to-parallel and parallel-to-serial data converters based on Mach-Zehnder interferometers. We experimentally demonstrate these data converters at 10Gbit/s serial data rate. They are useful all-optical devices for the all-optical implementations of label decoding, self-routing, control of variable packets, bit-wise logical operation, and data format conversion.

• 대한전자공학회논문지TC
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• 제40권10호
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• pp.79-88
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• 2003

링 구조형 광통신망에 적합한 완전 광 패킷 스위칭 시스템을 실험적으로 검증한다. 실험적 검증을 위해, 비디오 신호는 헤더와 페이로드로 구성된 광 패킷에 실리고, 완전 광 패킷 스위칭 노드에 전달된다. 전달된 광 패킷은 여러가지 완전 광 프로세서에 의해 처리되는데, 그들은 완전 팡 헤더 처리기, 패킷-레벨 클럭 추출기, 비트-레벨 클럭 추출기, 데이타 형태 변환기 등으로 구성되어 있다.

• 한국광학회지
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• 제13권5호
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• pp.421-424
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• 2002

반도체 광증폭기에 기반을 둔 소자들을 이용한 전광 반가산기가 처음으로 구현되었다. 전광 반가산기의 동작속도와 신호 형식은 각각 10Gb/s와 RZ였다. 전광 반가산기의 SUM과 CARRY의 동작에는 각각 전광 XOR 논리소자와 전광 AND 논리 소자가 이용되었으며 두 연산이 동시에 구현되었다.

• Current Optics and Photonics
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• 제2권5호
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• pp.400-406
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• 2018

The Semiconductor Optical Amplifier (SOA)-based Mach-Zehnder interferometer is a major contributor in all-optical digital processing and optical computation. Optical tree architecture provides one of the new, alternative schemes for integrated all-optical arithmetic and logical operations. In this paper, we propose an all-optical 3-bit integrated parity generator and checker using SOA-MZI-based optical tree architecture. The proposed scheme, able to process input signals at a desired operating wavelength, has been characterized using RZ-modulated signals at 10 Gbps. The maximum extinction ratios achieved at the output of the parity generator and checker are 10 dB and 8 dB respectively.

• Journal of the Optical Society of Korea
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• 제6권4호
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• pp.165-171
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• 2002

By using a semiconductor optical amplifier and a cross-phase modulation wavelength converter, fundamental all-optical logic gates including NOT, AND, NOR, XOR, and XNOR have been newly proposed and implemented. Realization of these all-optical logic gates will bring up not only all-optical networks but also all-optical computing and signal processing.

• Journal of the Optical Society of Korea
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• 제20권4호
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• pp.464-469
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• 2016

All-optical non-return-to-zero (NRZ) -to- return-to-zero (RZ) data-format conversion has been successfully demonstrated using a semiconductor optical amplifier in a fiber-loop mirror (so-called SOA-loop mirror) with a continuous-wave (CW) holding beam. The converted RZ signal after pulse compression has been used to create a 40 Gb/s OTDM (Optical Time Division Multiplexing) signal. Here is proposed an NRZ-to-RZ conversion method without any additional optical clocks, unlike conventional methods based on optical AND logic. In addition, it has the merit of operating at various bit-rate speeds without any controlling device. Moreover, it has a simple structure, and it can be used for all-optical bit-rate-flexible clock recovery.

• 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.

• 한국광학회지
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• 제13권2호
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• pp.151-154
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• 2002

선광(all-optical) OR 논리소자가 반도체 광증폭기 (SOA)의 이득포화와 파장변환 특성을 이용하여 구현되었다. 전광(all-optical) OR 논리소자는 이득의 비선형성에 의해 동작되므로 SOA의 이득포화를 충분히 얻기 위해 펌프신호는 SOA의 입력단에서 어븀 첨가 광섬유 증복기(EDFA)에 의해 증폭되었다. 전광 OR논리소자의 동작특성은 2.5 Gbit/s에서 성공적으로 측정되었다.

• Journal of Communications and Networks
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• 제18권4호
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• pp.551-558
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• 2016

In multifiber all-optical networks, optical amplifiers are used for amplifying multiple optical signals with different wavelengths in fibers. An optical amplifier operates when any of lightpaths passes through it. Therefore, it should simultaneously amplify as many lightpaths as possible for efficiently utilizing its power. This paper proposes a dynamic lightpath establishment scheme considering the use efficiency of the optical amplifiers and the depletion of the wavelength resources in multifiber all-optical networks. The proposed scheme provides a routing and wavelength assignment strategy that reduces both the power consumption of the optical amplifiers and the blocking probability of the lightpath establishment. Through simulation experiments, we demonstrate the effectiveness of the proposed scheme.

• Journal of the Optical Society of Korea
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• 제14권2호
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• pp.137-141
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• 2010

We report, for the first time to our knowledge, observation of polarization bistability from 1.55-${\mu}m$ wavelength single-mode VCSELs of a conventional cylinder-shape under control of their driving current, and demonstration of all-optical flip-flop (AOFF) operations based on the bistability with optical set and reset pulse injection at a 50 MHz switching frequency. The injection pulse energy was less than 14 fJ. The average on-off contrast ratio of the flip-flopped signals was about 7 dB. These properties of the VCSELs will be potentially useful for future high-speed all-optical signal processing applications.