Influence of bidirectional pumping in high-power EDFA on single-channel, multichannel and pulsed signal amplification

Deepa, R.; Vijaya, R.

doi:10.1016/j.yofte.2007.05.002

Cited by 5 publications

(4 citation statements)

References 34 publications

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“…The results are plotted in Fig. 5 showing that the highest net gain takes place for the backward pumping configuration (in agreement with other works [17][18][19] ) whereas the forward pump shows the lowest net gain. This result does not allow us to properly explain that the largest advancement occurs in the bidirectional scheme, as shown in Fig.…”

Section: Maximum Fractional Advancementsupporting

confidence: 89%

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Fast Light Enhancement by Bidirectional Pumping in Erbium-Doped Fibers

Ezquerro

Hernandez

Nombela

et al. 2010

J. Nonlinear Optic. Phys. Mat.

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We analyze the effect of pump configuration on the propagation velocity of an amplitudemodulated 1536 nm signal propagating through an ultra-highly doped erbium fiber amplifier. The nonlinear effects arising from the high value of the doping level lead to a strong variation of the pump power and signal gain along the fiber. We found that bidirectional pumping presents larger advancements than co-propagating and counterpropagating configurations. Numerical simulations allow us to explain the phenomenon in terms of the gain profile uniformity.

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Section: Maximum Fractional Advancementsupporting

confidence: 89%

“…17,18 As a compromise, bidirectional pumping scheme presents a gain between that of the unidirectional pumping schemes when using the same total pump power. 19 In fact, gain and noise figure can be controlled by adjusting the pumping power ratio.…”

Section: Introductionmentioning

confidence: 99%

Fast Light Enhancement by Bidirectional Pumping in Erbium-Doped Fibers

Ezquerro

Hernandez

Nombela

et al. 2010

J. Nonlinear Optic. Phys. Mat.

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show abstract

“…Pump power is distributed equally through both wavelength division multiplexers (WDM-1 and WDM-2) via a 3-dB optical coupler (OC-1), which forces the pump signal to propagate in opposite directions in the gain medium. This also ensures a uniform inversion in the HRFL gain medium [32], comprising of a section of EDF spliced between 90 km long Truewave REACH fiber (TW fiber). It is a single mode fiber that is claimed to have the highest Raman gain efficiency on the market.…”

Section: Impact Of Edf Length On Hybrid Raman-erbium Random Fiber Lasermentioning

confidence: 99%

Open Cavity Controllable Dual-Wavelength Hybrid Raman-Erbium Random Fiber Laser

et al. 2019

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This investigation demonstrates a simple open-ended controllable dualwavelength random fiber laser based on hybrid amplification of the Raman and erbiumdoped fiber (EDF). Bidirectional pumping is employed to power a 80 km Truewave REACH fiber and a section of EDF as the gain medium. Without cavity selectors and reflectors, a single or dual wavelength operation is obtained by pump power variation. Interchangeable lasing peaks are obtained at wavelengths 1557 and 1567 nm, and both with peak power discrepancies of 16.2, 18.3, and 0.1 dB, respectively. The proposed scheme presents opportunities for long distance applications utilizing single laser, dual laser, or combination of both.

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“…In this work, we focus to generate an optimized flattened gain spectrum in C-band using bidirectional pumping scheme. Out of different pumping schemes, bi-directional pumping has proved the best way of achieving high power amplification with a moderate noise level, using single core EDF [20] A pump laser of frequency 980 nm and pump power of 68 mW is used for co -propagating pump and frequency of 975 nm and 100 mW is used for counter-propagation. A single mode fiber of 100 km is used as the channel for transmission.…”

Section: Introductionmentioning

confidence: 99%

Optimized Flattened Gain Spectrum in C –Band WDM using Automatic Gain Control in Bi-Directionally Pumped EDFA

Saraswathy¹,

Vaidyan²

2015

IJERT

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In most of the telecommunication requirements, information needs to be carried at a long distance more than hundreds of kilometre and where the need of optical amplifier comes into picture to compensate mainly for the attenuation losses. Advancement in WDM and DWDM techniques enable the co-propagation of signals of different wavelength, thereby achieving data transmission speed as high as hundreds of gigabit per second over thousands of kilometre in a single mode fibre with most suitable optical amplifiers [1]. Erbium Doped Fiber Amplifiers have evolved as the most preferred optical amplifier and are widely used due to its transient suppression, wide band variable gain operation and also because of the low losses, amplification window where fiber has useable gain, high power transfer efficiency, large dynamic range, low noise figure etc. [2]. But, amplifier gain variations is an important concern in WDM networks, because the signal power fluctuations can be severe as the number of channel increases and the gain depends on the transmitted power. EDFA typically operated in two different modes viz. APC (Automatic power Control) and AGC (Automatic Gain Control), but, AGC method is mostly used in multi-channel WDM applications [3]. Several techniques were reported for the EDFA gain equalization, like, Thin film filters, long period fiber gratings, chirped fiber Bragg gratings etc[4]. There are different approaches being studied for automatic gain control in EDFA[5-8]. In this paper, we attempted one such automatic gain control technique to achieve an optimized flattened gain with very low noise figure with the help of numerical methods. The maximum value of the gain is 24.85 dB with a gain tilt of 1.65 dB, which is a very promising result since optical gain greater than 20 DB is very useful in WDM applications, with the advantage of having a flattened spectrum.

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Influence of bidirectional pumping in high-power EDFA on single-channel, multichannel and pulsed signal amplification

Cited by 5 publications

References 34 publications

Fast Light Enhancement by Bidirectional Pumping in Erbium-Doped Fibers

Fast Light Enhancement by Bidirectional Pumping in Erbium-Doped Fibers

Open Cavity Controllable Dual-Wavelength Hybrid Raman-Erbium Random Fiber Laser

Optimized Flattened Gain Spectrum in C –Band WDM using Automatic Gain Control in Bi-Directionally Pumped EDFA

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