• Title, Summary, Keyword: Optical logic

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Active Optical Logic Devices Using Surface-emitting Microlasers (표면광 마이크로 레이저를 이용한 능동형 광 논리 소자의 동작 특성)

  • 유지영
    • Korean Journal of Optics and Photonics
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    • v.4 no.3
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    • pp.294-300
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    • 1993
  • Monolithic NOR and INVERTER active optical logic devices inte- grated with surface-emitting microlasers, heterojunction photo- transistors(HPT) in parallel and resistors in series are characterized. The differential quantum efficiency of the typical AlGaAs superlattice microlaser integrated in the active optical logic devices is 15%. Current gain of the HPT is 57, when emitter-collector voltage and input optical power are 4 V and $50{\mu}W$, respectively. $57{\mu}W$ of output power from the active optical logic device decreases to zero when $47{\mu}W$ of input optical power is incident on the HPT part of the active logic device.

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Realization of High Speed All-Optical Half Adder and Half Subtractor Using SOA Based Logic Gates

  • Singh, Simranjit;Kaler, Rajinder Singh;Kaur, Rupinder
    • Journal of the Optical Society of Korea
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    • v.18 no.6
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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.

Fast All-Optical AND Logic Gates (고속 순광학적 AND Logic Gate)

  • 유연석;오세권;신정록;김동균
    • Proceedings of the Optical Society of Korea Conference
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    • pp.148-149
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    • 2001
  • 순광학적 스위치와 logic gate는 초고속 networks와 컴퓨터를 위한 차세대의 기술로 부각되고 있다. 현재 사용되고 있는 전자적인 switching, routing, 신호 처리들은 대용량 고속화에 그 한계를 나타내고 있다. 미래에 요구되는 초고속 광 네트워크의 계획은 광학 스위치와 광 변조장치가 필요하다는 것을 지적하고있다 최근에 전자나 광전자적으로 가능한 것 이상으로 미래에 요구되는 Tera bits/sec에 접근할 수 있는 고속 연산과 신호처리가 가능한 스위칭에 관한 연구가 활발이 진행되고 있다. (중략)

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A Study on the Optical Logic Gates Using Liquid Crystal Displays (액정 표시 소자를 이용한 광 논리 게이트에 관한 연구)

  • 송주소;권원현;은재정;박한규
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.25 no.7
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    • pp.844-850
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    • 1988
  • In this paper, the implementation of optical parallel boolean logic gates using two Liquid Crystal TVs is described. Based on theory of polarization modulation, two Liquid Crystal TVs are arranged in tandem and parallel to perform optical logic operations. Experimental results of binary image using two Liquid Crystal TVs are presented.

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All-Optical Composite Logic Gates with XOR, NOR, OR, and NAND Functions using Parallel SOA-MZI Structures (병렬 SOA-MZI 구조들을 이용한 XOR, NOR, OR 그리고 NAND 기능들을 가진 전광 복합 논리 게이트들)

  • Kim Joo-Youp;Han Sang-Kook
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.43 no.1
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    • pp.13-16
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    • 2006
  • We have proposed and experimentally demonstrated the all-optical composite logic gates with XOR, NOR, OR and NAND functions using SOA-MZI structures to make it possible to simultaneously perform various logical functions. The proposed scheme is robust and feasible for high speed all-optical logic operation with high ER.

Optical AND/OR gates based on monolithically integrated vertical cavity laser with depleted optical thyristor (집적화된 광 싸이리스터와 수직구조 레이저를 이용한 광 로직 AND/OR 게이트에 관한 연구)

  • Choi, Woon-Kyung;Kim, Doo-Gun;Kim, Do-Gyun;Choi, Young-Wan
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.43 no.12
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    • pp.40-46
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    • 2006
  • Latching optical switches and optical logic gates AND and OR are demonstrated, for the first time, by the monolithic integration of a vertical cavity lasers with depleted optical thyristor structure, which have not only a low threshold current with 0.65mA, but also a high on/off contrast ratio more than 50dB. By simple operating technique with changing a reference switching voltage, this single device operates as two logic functions, optical logic AND and OR. The thyristor laser fabricated using the oxidation process achieved a high optical output power efficiency and a high sensitivity to the optical input light.

Differential switching operation of vertical cavity laser with depleted optical thyristor for optical logic gates (광 로직 게이트 구현을 위한 차동구조 Vertical Cavity Laser - Depleted Optical Thyristor에 관한 연구)

  • Choi, Woon-Kyung;Kim, Doo-Gun;Choi, Young-Wan
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.44 no.7
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    • pp.24-30
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    • 2007
  • Latching optical switches and optical logic gates with AND or OR, and the INVERT functionality are demonstrated, for the first time, by the monolithic integration of a differential typed vertical cavity laser with depleted optical thyristor (VCL-DOT) structure with a low threshold current of 0.65 mA, a high slope efficiency of 0.38 mW/mA, and high sensitivity to input optical light. Many kinds of logic functions (AND, OR, NAND, NOR, and INVERT) are experimentally demonstrated using a differential switching operation scheme changing the intensity of a reference input beam without any changes of electrical circuits.

2.5 Gbit/s all-optical GR logic gate using semiconductor optical amplifiers (반도체 광증폭기(SOA)를 이용한 2.5 Gbit/s 전광 OR 논리 게이트)

  • Byun, Young-Tae;Kim, Jae-Hun;Jhon, Young-Min;Lee, Seok;Woo, Deok-Ha;Kim, Sun-Ho
    • Korean Journal of Optics and Photonics
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    • v.13 no.2
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    • pp.151-154
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    • 2002
  • All-optical OR logic gate is realized by use of gain saturation and wavelength conversion in the semiconductor optical amplifiers (SOA). It is operated by the nonlinearity of the SOA gain and hence 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. The operation characteristics of all-optical OR logic gate are successfully measured at 2.5 Gbit/s.

Characteristics of Top-Surface-Emitting Microlasers and Active Surface Emitting Laser Logic Devices (표면광 마이크로레이저 및 능동형 광학 연산소자의 특성)

  • 이용희
    • Korean Journal of Optics and Photonics
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    • v.2 no.4
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    • pp.233-241
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    • 1991
  • Structures, fabrication, and characteristics of top-surface-emitting GaAs four quantum well microlaser are described. The microlasers have good room-temperautre CW characteristivs. The maximum CW laser output is >3mW from a 30 $\mu\textrm{m}$ diameter microlaser and the maximum differential quantum efficiency is >70% from a 10 $\mu\textrm{m}$ diameter microlaser. Active surface emitting laser logic devices are designed and fabricated as a discrete version of a top-surface-emitting laser and heterojunction phototransistor. The active surface emitting laser logic device have high optical gain (>20 overall, >200 differential) and very high on/off ratio. Two-dimensional arrays of top-surface-emitting microlasers and active surface emitting laser logic devices will be critical elements for optical computing, photonic switching and neural network applications.

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Optical Implementation of Asymmetric Cryptosystem Combined with D-H Secret Key Sharing and Triple DES

  • Jeon, Seok Hee;Gil, Sang Keun
    • Journal of the Optical Society of Korea
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    • v.19 no.6
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    • pp.592-603
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    • 2015
  • In this paper, an optical implementation of a novel asymmetrical cryptosystem combined with D-H secret key sharing and triple DES is proposed. The proposed optical cryptosystem is realized by performing free-space interconnected optical logic operations such as AND, OR and XOR which are implemented in Mach-Zehnder type interferometer architecture. The advantage of the proposed optical architecture provides dual outputs simultaneously, and the encryption optical setup can be used as decryption optical setup only by changing the inputs of SLMs. The proposed cryptosystem can provide higher security strength than the conventional electronic algorithm, because the proposed method uses 2-D array data, which can increase the key length surprisingly and uses 3DES algorithm, which protects against “meet in the middle” attacks. Another advantage of the proposed asymmetrical cryptosystem is that it is free to change the user’s two private random numbers in generating the public keys at any time. Numerical simulation and performance analysis verify that the proposed asymmetric cryptosystem is effective and robust against attacks for the asymmetrical cipher system.