• Title, Summary, Keyword: Optical logic

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All-optical Logic gate using the SOA/DFB-SOA with Broadband-Gain (광대역 이득을 가진 SOA/DFB-SOA를 이용한 전광 논리구현)

  • Kim, Young-Il;Kim, Jae-Hun;Lee, Seok;Woo, Heok-Ha;Yoon, Tae-Hoon
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.109-111
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    • 2002
  • We have demonstrated all-opticalflip-flop based on optical bistability in a SOA/DFB-SOA with broadband gain. Input signal with the wavelength of 1340.23 nm or 1680.93 nm and the current of about 98% of the lasing threshold is injected into theDFB-SOA. Current injected into SOA is 80 mA All-optical flip-flop has various applications such as all-optical memory, demultiplexing, packet-header buffering, and retiming.

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An All-Optical NOR Logic Device using a Semiconductor Optical Amplifier and an External Modulation Technique (반도체 광증폭기와 외부변조 기법을 이용한 전광 NOR 논리소자)

  • Byun, Young-Tae;Kim, Sang-Hyuck;Lee, Seok;Kim, Jae-Hun;Woo, Deok-Ha;Kim, Sun-Ho
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.197-200
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    • 2000
  • All-optical NOR logic device was realized by use of two pump signals with a single wavelength and a semiconductor optical amplifier(SOA). Specially, Mach-Zehnder(MZ) modulator was used for an external modulation of the pump signals. To obtain the sufficient gain saturation of the SOA, pump signals are amplified by an Er-doped fiber amplifier(EDFA) at the input of the SOA. Pump and probe signals are obtained from a DFB laser diode(${\lambda}_p$=1554 nm) and a tunable laser diode(${\lambda}_s$=1535 nm), respectively. The operation characteristics of the NOR logic device are successfully measured and demonstrated at the modulation frequency of 4.83 MHz.

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Sensitivity analysis of 20:1 zoom infrared optical system with zernike polynomial coefficients (제르니케(Zernike)계수를 이용한 20:1 줌 적외선 광학계 민감도 분석)

  • 최세철;김현숙;김창우;김연수;이국환;김현규
    • Korean Journal of Optics and Photonics
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    • v.14 no.5
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    • pp.535-544
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    • 2003
  • The sensitivity analysis of a middle wave infrared optical system with 20: 1 zoom ratio is performed to analyze manufacturing and alignment tolerances, and to establish the alignment logic and the focus control strategy. The characteristics of the sensitivities of Zernike coefficients are investigated to all mechanical displacements and several zoom positions using Code-V Macro. From this result, the tolerances of manufacturing and alignment of the optical system are derived and the effective alignment logic is established. Futhermore, an effective focus control strategy is established to make the system simple and compact.

Implementation of Optical Paralle Adder using Polarization Coding (실시간 편광부호화에 의한 광병렬 가산기 구현)

  • 조웅호;배장근;노덕수;김수중
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.17 no.12
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    • pp.1484-1493
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    • 1992
  • In this paper, we propose the polarization coding of optical logic gates using filters and LCTV's, and represent the real-time system of an optical parallel adder to improve a carry propagation delay time. We fabricated a polarization filter for the polarization coding of a cell and an electrical system instead of an optical flip-flop which was necessary to an optical parallel adder. We used an optical fiber to play a part of decoding mask and interconnections in an optical parallel adder. The experimental results show that the polarization coding of a cell can represent 16 optical logic functions and that the implemented optical parallel adder can operate in real-time.

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A Study on the optical logic gate using LED array (LED 배열을 이용한 광논리 게이트에 관한 연구)

  • 권원현;박한규
    • Proceedings of the Korean Institute of Communication Sciences Conference
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    • pp.25-27
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    • 1984
  • Using LED sources, the system that performs optical logic function of the input data arrays will be presented. Sixteen possible functions of two binary data arrays, such as AND, OR, NOR and XOR are simply obtained in parallel by controlling LED switching mode. Experimental result and some examples of application will be given.

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Real-time Optical Logic Processors by Two-Wave Mixing in $BaTiO_3$ Crystal ($BaTiO_3$ 결정에서의 두 광파 혼합현상을 이용한 광 논리처리기)

  • 김기홍;권원현;오창석;박한규
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.26 no.10
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    • pp.1571-1575
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    • 1989
  • Nonlinear beam coupling phenomena in photorefractive materials are analyzed as a function of the input beam intensities. Signal beam saturation and pump beam depletion are shown to be the intensity-dependent functions of these materials. Utilizing these phenomena in a photorefractive BaTiO3 crystal, optical logic processors such as AND, OR, NOT, etc., are implemented.

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A novel 10 Gbit/s all-optical NOR logic gate (새로운 10 Gbit/s 전광 NOR 논리 게이트)

  • Byun, Young-Tae;Kim, Jae-Heon;Jeon, Young-Min;Lee, Seok;Woo, Duk-Ha;Kim, Sun-Ho
    • Korean Journal of Optics and Photonics
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    • v.14 no.5
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    • pp.530-534
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    • 2003
  • A novel all-optical NOR gate is proposed and demonstrated for the first time by use of gain saturation in a semiconductor optical amplifier (SOA). It is operated by the nonlinearity of the SOA gain. Hence, to obtain sufficient gain saturation of the SOA, pump signals are amplified by an Er-doped fiber amplifier at the input of the SOA. The operation characteristics of the all-optical NOR gate are successfully measured at 10 Gbit/s.

Dynamics of All-Optical Switching in Bacteriorhodopsin and its Application to Optical Computing

  • Singh, C.P.;Roy, Sukhdev
    • Journal of Photoscience
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    • v.9 no.2
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    • pp.317-319
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    • 2002
  • All-optical switching has been demonstrated in bacteriorhodopsin (bR) based on nonlinear intensity induced excited state absorption. The transmission of a cw probe laser beam at 410 nm corresponding to the peak absorption of M state through a bR film is switched by a pulsed pump laser beam at 570 nm that corresponds to the maximum initial 8 state absorption. The switching characteristics have been analyzed using the rate equation approach considering all the six intermediate states (B, K, L, M, N and 0) in the bR photocycle. The switching characteristics are shown to be sensitive to life time of the M state, absorption cross-section of the 8 state at probe wavelength ($\sigma$ $\_$Bp/) and peak pump intensity. It has been shown that the probe laser beam can be completely switched off (100 % modulation) by the pump laser beam at relatively low pump powers, for $\sigma$$\_$Bp/ = O. The switching characteristics have been used to design all-optical NOT, OR, AND and the universal NOR and NAND logic gates for optical computing with two pulsed pump laser beams.

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