• Title/Summary/Keyword: Gain saturation

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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.

A Study of the Transient Effect at the Thulium-doped Optical Fiber Amplifier (Thulium이 도핑된 광섬유 증폭기의 과도현상에 관한 연구)

  • 이재명;이영우
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2001.10a
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    • pp.349-352
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    • 2001
  • The transient response in TDFA(Thulium-Doped Fiber Amplifier) is theoretically investigated. The TDFA has the spectral gain band in 1.47 ${\mu}{\textrm}{m}$. The transient model includes the transient buildup of the population inversion, the pump power, the signal power and their transient variation along the fiber amplifier. The results of numerical analysis can predict the gain saturation and recovery time at the fiber amplifier. It also shows the gain saturation and recovery effect depending on the pumping and saturation rate.

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Measurement of Gain Coefficient and Saturation Power of CW Waveguide CO_2$$ Laser (연속발진 도파형 이산화탄소 레이저의 이득계수 및 포화출력 측정)

  • 이승걸;김현태;박대윤
    • Korean Journal of Optics and Photonics
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    • v.1 no.2
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    • pp.162-168
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    • 1990
  • Two ZnSe loss plates were installed in the resonator of waveguide CO2 laser which consisted of Pyrex capillary tube in order to change the internal loss. By rotating the loss plates, the output variations with the internalloss was measured on various discharge conditions. The variations could be explained by the Rigrod theory. and the saturation power and the unsaturated gain coefficient were determined by fitting of the experimental results. It was found that the saturation power increased while the unsaturated gain coefficient reduced as the discharge current or the gas flow rate increased.reased.

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Optimum thickness of GaAs top layer in AlGaAs-based 850 nm VCSELs for 56 Gb/s PAM-4 applications

  • Yu, Shin-Wook;Kim, Sang-Bae
    • ETRI Journal
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    • v.43 no.5
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    • pp.923-931
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    • 2021
  • We studied the influence of GaAs top-layer thickness on the small-signal modulation response and 56 Gb/s four-level pulse-amplitude modulation eye quality of 850 nm vertical-cavity surface-emitting lasers (VCSELs). We considered the proportionality of the gain-saturation coefficient to the photon lifetime. The simulation results that employed the transfer-matrix method and laser rate equations led to the conclusion that the proportionality should be considered for proper explanation of the experimental results. From the obtained optical eyes, we could determine an optimum thickness of the GaAs top layer that rendered the best eye quality of VCSEL. We also compared two results: one result with a fixed gain-saturation coefficient and the other that considered the proportionality. The former result with the constant gain-saturation coefficient demonstrated a better eye quality and a wider optimum range of the GaAs top-layer thickness because the resultant higher damping reduced the relaxation oscillation.

The effect of gain recovery at the optical fiber amplifier by the input pulse train (광섬유 증폭기에서의 입력 펄스 열에 의한 Cain Recovery 특성)

  • 이재명;이영우
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.6 no.3
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    • pp.459-463
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    • 2002
  • We studied the effect of gain recovery at the optical fiber amplifier by the input pulse trains We also theoretically analyzed the limitation of the saturation and recovery time for the PDFA(Praseodymium-Doped Fiber Amplifier) which has the spectral gain at 1.3${\mu}{\textrm}{m}$ band. We can predict the interval between the pulse train, pump power, and the effect of the saturation and recovery time which is affected to the amplification of the optical pulse.

The effect of gain recovery at the optical fiber amplifier by the input pulse train (광섬유 증폭기에서의 입력 펄스 열에 의한 Cain Recovery 특성)

  • 이재명;이영우
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2002.05a
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    • pp.505-508
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    • 2002
  • We studied the effect of gain recovery at the optical fiber amplifier by the input pulse trains. We also theoretically analyzed the limitation of the saturation and recovery time for the PDFA(Praseodymium-Doped Fiber Amplifier) which has the spectral gain at 1.3${\mu}{\textrm}{m}$ band. We can predict the interval between the pulse train, pump power, and the effect of the saturation and recovery time which is affected to the amplification of the optical pulse.

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A Study of the Gain Recovery Properties at the Thulium-doped fiber Amplifier ($Tm^{3+}$가 첨가된 광섬유 증폭기의 이득회복 특성)

  • 이재명;황대석;김규식;이영우
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2002.11a
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    • pp.533-534
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    • 2002
  • In this paper, we studied the transient gain response in TDFA(Thulium-Doped Fiber Amplifier) theoretically. We also investigated the limitation of the gain saturation and recovery time when the short pulse trains are incident into the TDFA with the spectral gain band in 1.47${\mu}{\textrm}{m}$ for using at WDM. We can predict the interval between the pulse train, pump power and the effect of the saturation and recovery time which is affected to the amplification of the optical pulse.

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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.

Color matching using dot gain and intensity compensation for different substrates (점이득 보정과 명도 보정을 이용한 서로 다른 매질 사이의 색정합)

  • 이철희;이채수;김경만;하영호
    • Journal of the Korean Institute of Telematics and Electronics S
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    • v.34S no.5
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    • pp.73-85
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    • 1997
  • In a drop-on-demand thermal ink-jet printer, the dot size of an ink droplet expelled from a printer depends on the absorption of the paper. This causes severe differences between output images on the different paper materials. In this paper, the color matching algorithm for different papers is proposed. To achieve corresponding color reproduction, dot gain compensatio nbased on saturation was applied to predict color reproduction on a printer. If the dot gain of pigment increases, the white portion of paper decreases while the saturation value increases monotonically. As the results of dot gain compensation, intensity change may appear. Therefore, an intensity compensation without any hue variation is followed to match the colors of different subtrates.

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