• Title/Summary/Keyword: EDFA

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Optimizing the Net Gain of a Raman-EDFA Hybrid Optical Amplifier using a Genetic Algorithm

  • Singh, Simranjit;Kaler, Rajinder Singh
    • Journal of the Optical Society of Korea
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    • v.18 no.5
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    • pp.442-448
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    • 2014
  • For the first time, a novel analytical model of the net gain for a Raman-EDFA hybrid optical amplifier (HOA) is proposed and its various parameters optimized using a genetic algorithm. Our method has been shown to be robust in the simultaneous analysis of multiple parameters (Raman length, EDFA length, and pump powers) to obtain large gain. The optimized HOA is further investigated at the system level for the scenario of a 50-channel DWDM system with 0.2-nm channel spacing. With an optimized HOA, a flat gain of >17 dB is obtained over the effective ITU-T wavelength grid with a variation of less than 1.5 dB, without using any gain-flattening technique. The obtained noise figure is also the lowest value ever reported for a Raman-EDFA HOA at reduced channel spacing.

Analysis of Laser Weldment Distortion in the EDFA LD Pump Packaging (광신호 증폭기 EDFA LD 펌프 패키징 레이저 용접부 변형 해석)

  • Gang, Dae-Hyeon;Son, Gwang-Jae;Yang, Yeong-Su
    • Journal of the Korean Society for Precision Engineering
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    • v.18 no.1
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    • pp.139-146
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    • 2001
  • This paper presents a study on heat transfer and residual distortion analysis of laser welded EDFA(Erbium Doped Fiber Amplifier) LD(Laser Diode) Pump using the finite element method. In the production process of LD Pump in light-wave communication system, ferrule and saddle are welded by Nd-YAG laser. These parts experience thermal and mechanical effect during heating and cooling cycle with the laser welding. Thus distortion happens in the laser-welded packaging, and it makes an error in detecting the light signal translate through optical fiber in LD Pump. The amount of final displacement produced by the laser welding is predicted using the finite element method. And the optimal shape of saddle is proposed with the results of numerical analyses to minimize the displacement.

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Double-Pass Two-Stage EDFA with Gain-Flattening Filters

  • Sohn, Ik-Bu;Baek, Jang-Gi;Song, Jae-Won
    • Journal of the Optical Society of Korea
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    • v.7 no.2
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    • pp.64-66
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    • 2003
  • The optical gain and noise figure improved double-pass two-stage EDFA using a mirror, circulator, and gain-flattening filters is proposed. By double passing the pump light and removing the ASE propagating into the input part, the signal gain of 5 ㏈ and noise figure of 2.1 ㏈ are improved compared to the conventional single- and double-pass EDFA With gain-fattening filters in the second stage of EDFA, we obtain an improved flat gain with a gain flatness less than 1 ㏈ over 33-nm wavelength range at the 980-nm pump power of 86 ㎽.

Jitter Reduction by Modulator-Bias Control in Analog Fiber-Optic Links Employing a Mach-Zehnder Modulator Followed by an Erbium-Doped Fiber Amplifier (마하-젠더 광 변조기와 EDFA로 구성된 아날로그 광통신 링크에서 변조기 바이어스 조정을 이용한 랜덤 지터의 감소)

  • Lee, Min-Young;Yoon, Young-Min;Shin, Jong-Dug
    • Journal of IKEEE
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    • v.13 no.4
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    • pp.103-109
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    • 2009
  • We report an efficient jitter reduction technique in an analog fier-optic link employing a Mach-Zehnder modulator followed by an erbium-doped fiber amplifier. By adjusting the modulator-bias to $0.089V_{\pi}$, we could increase the RF gain up to 10.65 dB for 10 GHz RF signal and reduce the random jitter by 46.5%, max, at an input optical power of -0.11 dBm to the EDFA.

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A Study on Optimization of Transmission network platform using for DWDM in Optical fiber system (파장분할 광통신 방식을 이용한 전송망 구축의 최적화 방안 연구)

  • Kim, Sang-Kyun;Woo, Mi-Ae
    • Proceedings of the Korea Information Processing Society Conference
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    • 2003.05b
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    • pp.1117-1120
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    • 2003
  • DWDM(DensedWavelengthDivisionMultiplexing)은 광 파이버를 이용하여 기존의 통신보다 높은 대역폭(B/W)을 얻기 위한 기술로 여러 신호를 각각 다른 파장으로 변조해 하나의 Fiber 를 통해 전송하는 방식이며, 기본적으로 EDFA(Erbium Doped Fiber Amplifier), AWG(Arrayed Wave guide Grating), OADM(Optical Add/Drop Multiplexer) 등의 주요 부품과 여러 광 관련 부품들로 구성돼 있으며, 다수의 파장을 MUX(AWG)에서 다중화하고, 장거리 전송을 위해 OA(EDFA)에서 광신호를 증폭하게 된다 그리고 일부 특정 파장만 Add/Drop하기 위해 OADM이 놓이게 되며, 또한 선로(광섬유)의 손실을 보상하기 위해 필요한 구간에 리피터(EDFA)를 두어 광신호를 증폭 송신하며 수신단에서는 들어오는 여러 파장을 OA(EDFA)를 통해 증폭한 후 DEMUX(AWG)에서 역 다중화해 수신하게 된다. 이와 같은 DWDM방식을 이용한 Network는 Star, Mesh, Ring 등의 다양한 형태로 구성될 수 있으며, 초기에는 Point-to-Point 방식의 장거리 전송에 주로 사용돼 왔으나 Metro 구간의 Traffic 이 급격히 증가하면서 Metro- DWDM Network 이 부각되고 있어 본 논문에서는 현재 SK Telecom에서 상용화되고 있는 1,600G DWDM과 Metro-DWDM간의 망 구축의 최적화 방안을 연구해 본다.

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320km Optical Transmission using EDFA and Raman amplifier for 10Gbit/s 128 Channel DWDM Signals (10 Gbit/s 128 채널 고밀도 파장다중화 신호를 위해 EDFA와 라만 증폭기를 이용한 320km 광전송 실험)

  • Choi, Bo-Hun
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.34 no.6B
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    • pp.568-574
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    • 2009
  • 320km optical transmission link for 128 channel DWDM (dense wavelength-division-multiplexing) signals is simulated and fabricated. An optical fiber amplifier for the link is composed of a distributed Raman amplifier and dual C/L-band EDFAs which are optimized for the performances of an optical amplifier obtained from the simulation. Gain and NF of the optimized EDFAs are above 19dB and below 7.5dB, respectively. The resultant OSNRs (optical signal to noise ratios) of the link are average 25dB on each band.

Simulation of Dispersion Compensation Transmission System Using Split-Step Finite Element Method (단계 분할 유한 요소법을 이용한 분산 보상 광 전송 시스템의 시뮬레이션)

  • Hong, Soon-Won;Lee, Ho-Joon
    • Journal of the Korean Institute of Telematics and Electronics D
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    • v.36D no.8
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    • pp.79-86
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    • 1999
  • A simulation of 10 Gbps optical fiber transmission system using DCf(dispersion compensating fiber) for the dispersion compensation is performed. In order to analyze the NRZ pulse propagation in nonlinear, dispersive and lossy fiber, the split-step finite element method that is combination of finite element method and finite difference method is used. Also, we obtained the optical eye diagram and BER characteristics at the receiver of the system that is contained the optical amplifier and system noises. As a result of simulation, we obtain that the dispersion penalty is about 0.8dB after 50km transmission and the receiver sensitivities at $10^{-9}$ BER are -27.4dBm with EDFA pre-amplifier of 12dB gain and -15.6dBm without EDFA.

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The Characteristics of Transient Response According to Lasing Wavelengths and Propagation Directions in Double-Pass Gain-Clamped L-band EDFA with Linear Cavity (이중경로증폭 선형공진 고정이득 L-band EDFA에서 발진 파장 및 방향에 따른 과도응답 특성)

  • Kim Ik-Sang
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.31 no.6A
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    • pp.547-555
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    • 2006
  • We implemented DPU(Double-Pass Gain-Clamped) L-band EDFA for highly efficient amplification. A lasing signal generated within the linear cavity, can minimize the fluctuation of surviving channels when several WDM(Wavelength Division Multiplexing) channels are added or dropped. The new method measuring the characteristics of transient response of surviving channels quantitatively is suggested. It is to measure the ratio of lasing output before add or drop to that after add or drop. We investigated dynamic characteristics by using this method according to lasing wavelengths and propagation directions within the cavity. Experimental measurements show that the short lasing wavelength and backward propagation direction is the best condition for small fluctuation of surviving channels.