• Title, Summary, Keyword: Optical logic

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The Transmission of Random Clock Data using FPGA (FPGA를 이용하여 다양한 클럭 데이터 전송)

  • Kim, Yun-Kwon;Shin, Hyun-Sung;Jeong, Je-Myung
    • Proceedings of the KIEE Conference
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    • pp.385-387
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    • 2006
  • We made the logic that can transmit the service data and clock of interest by using the optical signal and demodulate the original signal at the receiving end. Because We can interface the all communications equipment to which We intended to send the signal. We can modulate the dock and clocked data using optical signal and then transmit the original optical signal to the receiving end, finally, arbitrarily control the traffic between ports.

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A Study on the Optical Bistable Characteristic of a Multi-Section DFB-LD (다전극 DFB-LD의 광 쌍안정 특성에 관한 연구)

  • Kim, Geun-Cheol;Jeong, Yeong-Cheol
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.39 no.8
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    • pp.1-11
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    • 2002
  • A multi-section DFB-LD shows optical bistability subject to externally injected light signal, then it has potential applications such as wavelength conversion and optical logic gates. In this paper, we have studied the optical bistability in multi-section DFB-LD using split-step time-domain model. It is confirmed that the multi-section DFB-LD, which is excited inhomogeneously, shows bistability. The optical bistable characteristics are investigated when input light is injected into a absorptive region. Simulation results show that multi-section DFB-LD works as a flip-flop depending on the set-reset optical pulse which has a few ns in switching time and a few pj in switching energy, so that it can act as a optical logic device. Besides, if we change the carrier lifetime and the differential gain coefficient, it is expected that the response time of optical output signal can be reduced.

Data Compression Algorithm for Efficient Data Transmission in Digital Optical Repeaters

  • Kim, Jae Wan;Eom, Doo Seop
    • Journal of the Institute of Electronics and Information Engineers
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    • v.49 no.12
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    • pp.142-146
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    • 2012
  • Today, the demand for high-speed data communication and mobile communication has exploded. Thus, there is a growing need for optical communication systems that convert large volumes of data to optical signals and that accommodate and transmit the signals across long distances. Digital optical communication with these characteristics consists of a master unit (MU) and a slave unit (SU). However, the digital optical units that are currently commercialized or being developed transmit data without compression. Thus, digital optical communication using these units is restricted by the quantity of optical frames when adding diversity or operating with various combinations of CDMA, WCDMA, WiBro, GSM, LTE, and other mobile communication technologies. This paper suggests the application of a data compression algorithm to a digital signal processor (DSP) chip as a field programmable gate array (FPGA) and a complex programmable logic device (CPLD) of a digital optical unit to add separate optical waves or to transmit complex data without specific changes in design of the optical frame.

All-Optical Bit-Rate Flexible NRZ-to-RZ Conversion Using an SOA-Loop Mirror and a CW Holding Beam

  • Lee, Hyuek Jae
    • Journal of the Optical Society of Korea
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    • v.20 no.4
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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.

Simulative Investigation of Spectral Amplitude Coding Based OCDMA System Using Quantum Logic Gate Code with NAND and Direct Detection Techniques

  • Sharma, Teena;Maddila, Ravi Kumar;Aljunid, Syed Alwee
    • Current Optics and Photonics
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    • v.3 no.6
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    • pp.531-540
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    • 2019
  • Spectral Amplitude Coding Optical Code Division Multiple Access (SAC OCDMA) is an advanced technique in asynchronous environments. This paper proposes design and implementation of a novel quantum logic gate (QLG) code, with code construction algorithm generated without following any code mapping procedures for SAC system. The proposed code has a unitary matrices property with maximum overlap of one chip for various clients and no overlaps in spectra for the rest of the subscribers. Results indicate that a single algorithm produces the same length increment for codes with weight greater than two and follows the same signal to noise ratio (SNR) and bit error rate (BER) calculations for a higher number of users. This paper further examines the performance of a QLG code based SAC-OCDMA system with NAND and direct detection techniques. BER analysis was carried out for the proposed code and results were compared with existing MDW, RD and GMP codes. We demonstrate that the QLG code based system performs better in terms of cardinality, which is followed by improved BER. Numerical analysis reveals that for error free transmission (10-9), the suggested code supports approximately 170 users with code weight 4. Our results also conclude that the proposed code provides improvement in the code construction, cross-correlation and minimization of noises.

Study of Neuron Operation using Controlled Chaotic Instabilities in Brillouin-Active Fiber Based Neural Networks

  • Kim, Yong-K.;Huh, Do-Geun;Kim, Kwan-Woong;Yu, C.
    • Journal of Electrical Engineering and Technology
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    • v.1 no.4
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    • pp.546-549
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    • 2006
  • In this paper the neuron operation based on Brillouin-active fiber in optical fiber is described. The inherent optical feedback by the backscattered stokes wave in optical fiber leads to instabilities in the form of optical chaos. Controlling of chaos induced transient instability in Brillouin-active fiber is implemented with Kerr nonlinearity having a non-instantaneous response in network systems. The controlling chaotic instabilities can lead to multistable periodic states; create optical logic 'on' or high level '1' or 'off', or low level '0'. It is theoretically possible to apply the multi-stability regimes as an optical memory device for encoding and decoding series and complex data transmission in optical systems.

5 Gb/s all-optical XOR gate by using semiconductor optical amplifier (Semiconductor Optical Amplifier를 이용한 5 Gb/s전광 XOR논리소자)

  • Kim, Jae-Hun;Byun, Young-Tae;Jhon, Young-Min;Lee, Seok;Woo, Deok-Ha;Kim, Sun-Ho
    • Korean Journal of Optics and Photonics
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    • v.13 no.1
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    • pp.84-87
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    • 2002
  • By using SOA (Semiconductor Optical Amplifier), all-optical XOR gate has been demonstrated at 5 Gb/s in RZ format. Firstly, Boolean AB-and Boolean AB have been obtained. Then, Boolean AB and Boolean AB have been combined to achieve the all-optical XOR gate, which has Boolean logic of AB+AB.