• Title, Summary, Keyword: Optical logic

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Ultrahigh Speed Reconfigurable Logic Operations Based on Single Semiconductor Optical Amplifier

  • Kaur, Sanmukh;Kaler, Rajinder-Singh
    • Journal of the Optical Society of Korea
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    • v.16 no.1
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    • pp.13-16
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    • 2012
  • We demonstrate an optical gate architecture using a single SOA to perform AND, OR and NOT logic functions. Simple reconfigurable all-optical logic operations are implemented using RZ modulated signals at 40 Gb/s. Contrast ratio and extinction ratio values have been analysed for the different types of logic gates. Maximum extinction ratio and contrast ratio achieved are 19dB and 17.2 dB respectively. Simple structure and potential for integration makes this architecture an interesting approach in photonic computing and optical signal processing.

All Optical Logic Gate Based On Optical Bistability of DFB SOA (DFB SOA의 광쌍안정 특성을 이용한 전광논리구현)

  • Kim, Byung-Chae;Kim, Young-Il;Lee, Seok;Woo, Deok-Ha;Yoon, Tae-Hoon
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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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.

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All Optical Logic Gates Based on Two Dimensional Plasmonic Waveguides with Nanodisk Resonators

  • Dolatabady, Alireza;Granpayeh, Nosrat
    • Journal of the Optical Society of Korea
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    • v.16 no.4
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    • pp.432-442
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    • 2012
  • In this paper, we propose, analyze and simulate the performances of some new plasmonic logic gates in two dimensional plasmonic waveguides with nanodisk resonators, using the numerical method of finite difference time domain (FDTD). These gates, including XOR, XNOR, NAND, and NOT, can provide the highly integrated optical logic circuits. Also, by cascading and combining these basic logic gates, any logic operation can be realized. These devices can be utilized significantly in optical processing and telecommunication devices.

Optical Look-ahead Carry Full-adder Using Dual-rail Coding

  • Gil Sang Keun
    • Journal of the Optical Society of Korea
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    • v.9 no.3
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    • pp.111-118
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    • 2005
  • In this paper, a new optical parallel binary arithmetic processor (OPBAP) capable of computing arbitrary n-bit look-ahead carry full-addition is proposed and implemented. The conventional Boolean algebra is considered to implement OPBAP by using two schemes of optical logic processor. One is space-variant optical logic gate processor (SVOLGP), the other is shadow-casting optical logic array processor (SCOLAP). SVOLGP can process logical AND and OR operations different in space simultaneously by using free-space interconnection logic filters, while SCOLAP can perform any possible 16 Boolean logic function by using spatial instruction-control filter. A dual-rail encoding method is adopted because the complement of an input is needed in arithmetic process. Experiment on OPBAP for an 8-bit look-ahead carry full addition is performed. The experimental results have shown that the proposed OPBAP has a capability of optical look-ahead carry full-addition with high computing speed regardless of the data length.

Asymmetric Public Key Cryptography by Using Logic-based Optical Processing

  • Gil, Sang Keun
    • Journal of the Optical Society of Korea
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    • v.20 no.1
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    • pp.55-63
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    • 2016
  • In this paper, a new asymmetric public key cryptography based on the modified RSA algorithm is proposed by using logic-based optical processing. The proposed asymmetric public key algorithm is realized into an optical schematic, where AND, OR and XOR logic operations are implemented by using free space digital optics architecture. Schematically, the proposed optical configuration has an advantage of generating the public keys simultaneously. Another advantage is that the suggested optical setup can also be used for message encryption and decryption by simply replacing data inputs of SLMs in the optical configuration. The last merit is that the optical configuration has a 2-D array data format which can increase the key length easily. This can provide longer 2-D key length resulting in a higher security cryptosystem than the conventional 1-D key length cryptosystem. Results of numerical simulation and differential cryptanalysis are presented to verify that the proposed method shows the effectiveness in the optical asymmetric cryptographic system.

Optical Implementation of Triple DES Algorithm Based on Dual XOR Logic Operations

  • Jeon, Seok Hee;Gil, Sang Keun
    • Journal of the Optical Society of Korea
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    • v.17 no.5
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    • pp.362-370
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    • 2013
  • In this paper, we propose a novel optical implementation of a 3DES algorithm based on dual XOR logic operations for a cryptographic system. In the schematic architecture, the optical 3DES system consists of dual XOR logic operations, where XOR logic operation is implemented by using a free-space interconnected optical logic gate method. The main point in the proposed 3DES method is to make a higher secure cryptosystem, which is acquired by encrypting an individual private key separately, and this encrypted private key is used to decrypt the plain text from the cipher text. Schematically, the proposed optical configuration of this cryptosystem can be used for the decryption process as well. The major advantage of this optical method is that vast 2-D data can be processed in parallel very quickly regardless of data size. The proposed scheme can be applied to watermark authentication and can also be applied to the OTP encryption if every different private key is created and used for encryption only once. When a security key has data of $512{\times}256$ pixels in size, our proposed method performs 2,048 DES blocks or 1,024 3DES blocks cipher in this paper. Besides, because the key length is equal to $512{\times}256$ bits, $2^{512{\times}256}$ attempts are required to find the correct key. Numerical simulations show the results to be carried out encryption and decryption successfully with the proposed 3DES algorithm.

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)

  • Kim Doo-Gun;Jung In-Il;Choi Young-Wan;Choi Woon-Kyung
    • 한국정보통신설비학회:학술대회논문집
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    • pp.19-23
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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 0.65 mA. but also a high on/off contrast ratio more than 50 dB. 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.

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Design and Demonstration of All-Optical XOR, AND, OR Gate in Single Format by Using Semiconductor Optical Amplifiers (반도체 광증폭기를 이용한 다기능 전광 논리 소자의 설계 및 측정)

  • Son, Chang-Wan;Yoon, Tae-Hoon;Kim, Sang-Hun;Jhon, Young-Min;Byun, Yung-Tae;Lee, Seok;Woo, Deok-Ha;Kim, Sun-Ho
    • Korean Journal of Optics and Photonics
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    • v.17 no.6
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    • pp.564-568
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    • 2006
  • Using the cross-gain modulation (XGM) characteristics of semiconductor optical amplifiers (SOAs), multi-functional all-optical logic gates, including XOR, AND, and OR gates are successfully simulated and demonstrated at 10Gbit/s. A VPI component maker^TM simulation tool is used for the simulation of multi-functional all-optical logic gates and the10 Cbit/s input signal is made by a mode-locked fiber ring laser. A multi-quantum well (MQW) SOA is used for the simulation and demonstration of the all-optical logic system. Our suggested system is composed of three MQW SOAs, SOA-1 and SOA-2 for XOR logic operation and SOA-2 and SOA-3 for AND logic operation. By the addition of two output signals XOR and AND, all-optical OR logic can be obtained.

Realization of optical logic gates using photocycle properties of bacteriorhodopsin (박테리아로돕신의 광순환 특성을 이용한 광학적 논리회로 구현)

  • 오세권;유연석
    • Korean Journal of Optics and Photonics
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    • v.13 no.5
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    • pp.414-420
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    • 2002
  • We realized optical logic gates using a bacteriorhodopsin (bR) doped polymer film. The bR undergoes a complex photocycle characterized by several spectroscopically distinct intermediate states. We realized optical logic gates using a He-Ne laser (632.8 nm) and a He-Cd laser (413 nm) that consider B-state and absorption change of M-state in the photocycle of bR. Also, we realized high speed AND logic gate using He-Ne laser (632.8 nm) and the second harmonics at 532 nm from a pulsed Nd-YAG laser that considering absorption spectrum between B-state and K-state.

Demonstration of 10 Gbps, All-optical Encryption and Decryption System Utilizing SOA XOR Logic Gates (반도체 광 증폭기 XOR 논리게이트를 이용한 10 Gbps 전광 암호화 시스템의 구현)

  • Jung, Young-Jin;Park, Nam-Kyoo;Jhon, Young-Min;Woo, Deok-Ha;Lee, Seok;Gil, Sang-Keun
    • Korean Journal of Optics and Photonics
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    • v.19 no.3
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    • pp.237-241
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    • 2008
  • An all-optical encryption system built on the basis of electrical logic circuit design principles is proposed, using semiconductor optical amplifier (SOA) exclusive or (XOR) logic gates. Numerical techniques (steady-state and dynamic) were employed in a sequential manner to optimize the system parameters, speeding up the overall design process. The results from both numerical and experimental testbeds show that the encoding/decoding of the optical signal can be achieved at a 10 Gbps data rate with a conventional SOA cascade without serious degradation in the data quality.