Optimization of the 1050nm Pump Power and Fiber Length in Single-Pass and Double-Pass Thulium Doped Fiber Amplifiers (original) (raw)
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IEEE Photonics Technology Letters, 2000
We report on the characterization of a recently introduced dual-wavelength pumping scheme for thulium-doped fiber amplifiers using 800 and 1050 nm. Using a counterpropagating pump configuration, 180 mW of total pump power yielded 27-dB small-signal gain and less than 5-dB noise figure. Furthermore, using optical frequency domain reflectometry, the distributed gain in this configuration was evaluated, allowing for optimization of the doped fiber length.
IEEE Photonics Technology Letters, 2000
We present experimental results of distributed gain measurements from a dual-pumped (1050 nm + 1550 nm) thulium-doped fiber amplifier using optical frequency-domain reflectometry. We show that significant reductions in total pump power and/or fiber length are realized with the addition of a few milliwatts at 1550 nm. For our experimental conditions, the addition of 5 mW of 1550 nm allows for a reduction of 100 mW of pump power at 1050 nm or a reduction of 44% of doped fiber length to reach the same gain as with 1050-nm pumping alone. Index Terms-Fluoride fiber, optical fiber amplifiers, optical frequency-domain reflectometry (OFDR), thulium-doped fiber amplifier (TDFA).
Low-pump-power, short-fiber copropagating dual-pumped (800 and 1050nm) thulium-doped fiber amplifier
Optics Letters, 2003
Using optical frequency-domain ref lectometry to reveal the gain distribution and allow us to optimize a thulium-doped fiber amplifier, we have demonstrated 18-dB gain by employing only 5 m of a 2000-parts-in-10 6 -Tm-doped fiber pumped with 145 mW of power at dual wavelengths of 800 and 1050 nm. The role of the 800-nm pump, which by itself does not permit population inversion, was clearly observed experimentally.
Thulium Doped Fiber Amplifier (TDFA) for S-band WDM Systems
Open Journal of Applied Sciences
A comprehensive numerical model based on solving rate equations of a thulium-doped silica-based fiber amplifier is evaluated. The pump power and thulium-doped fiber (TDF) length for single-pass Thulium-Doped Fiber Amplifiers (TDFA) are theoretically optimized to achieve the optimum Gain and Noise Figure (NF) at the center of S-band region. The 1064 nm pump is used to provide both ground-state and excited state absorptions for amplification in the S-band region. The theoretical result is in agreement with the published experimental result.
IEEE Photonics Technology Letters, 2000
Signal amplification in the -and + -band is demonstrated for the first time by simultaneous pumping of thuliumdoped fiber amplifier (TDFA) with 690 and 1050 nm (or 1400 nm). Both pumping schemes are investigated and shown to be highly efficient: Roughly 20 dB of signal gain is available with only 80 mW of 1050 nm plus 42 mW of 690 nm, while signal input power is fixed at 35 dBm. Furthermore, these excitations can take advantage of low-cost readily available pump laser diodes at 690 nm for digital video disk applications. This makes TDFA a promising candidate for coarse wavelength-division-multiplexing applications in metropolitan area network and access network environment.
Thulium doped fiber amplifier in the SIS + band Employing Different Concentration profiles By
2009
This work contains a comparative study for the signal gain of thulium-doped fiber amplifier (TDFA) in the S-Band. Different doping techniques are used to obtain different concentration profiles in silica fibers. The optimal one is found to be the step like profile. TDFA is investigated in new prepared glass hosts. These hosts include: silicate, bismuth, fluoride, tellurite, chalcohalide, and heavy metal oxide. The effect ofthe different parameters on signal gain of the optical amplifiers is studied, followed by a comparison to select the best glass host. Results showed that the highest gain can provide by bismuth (Bi) glass host and broad band gain from 1450 nm to 1520 nm with a peak wavelength around 1480 nm. A maximum gain above 28.5 dB is obtained with 11 m long Bi-TDFA. These characteristics indicate that Bi-TDFA is a very promising candidate for S-band amplifiers. Indlex Ternms: Thulium, Concentration Profile, Optical Fiber Amplifiers, Wavelength Division Multiplexing (WD:M).
Broadband silica-based thulium doped fiber amplifier employing multi-wavelength pumping
Optics express, 2016
A multi-wavelength pumped thulium doped fiber amplifier is investigated to extend the spectral gain coverage of the amplifier in the 1.7-1.9μm wavelength range. Through the use of a combination of 791 nm, 1240 nm, and 1560 nm laser diode pumping, the amplifier gain can be improved significantly and overall gain bandwidth enhancement of ~47% as compared to single-wavelength pumping achieved. A nominal gain of 15 dB is achieved over a bandwidth of more than 250 nm spanning from 1700 to 1950 nm with a maximum gain of 29 dB and a noise figure of less than 5 dB.
Theoretical modelling of S-band thulium-doped silica fibre amplifiers
Optical and Quantum Electronics, 2000
A comprehensive numerical model of a thulium-doped silica-based fibre amplifiers is presented. The model is spectrally and spatially resolved and is general in terms of pumping scheme used. The application of the model for predicting the S-band amplifier performance and for optimization of amplifier parameters is shown. For optimized Tm-doped fibre with 3 H 4 level lifetime of 45 ls, which is the maximum value in the Tm-doped silica fibres prepared by the authors, above 20 dB of gain with 2000 mW pump power at the 1050 nm pump band can be expected according to the simulations.
100 W, Tunable In-band Pumped Thulium Fiber Amplifier
We detail the design and performance of a high efficiency in-band pumped thulium fiber amplifier operating at the 100 W level. Using a novel pumping architecture based on three incoherently combined thulium fiber oscillators at 1904 nm and a seed laser tunable from 1970-1990 nm, efficient amplification is demonstrated in a high dopant concentration 25/65/250 μm thulium fiber. Here we use the 65 μm pedestal surrounding the core as a pump cladding to increase the cladding to core overlap and improve the overall pump absorption. Up to 89% slope efficiency is obtained with ~100 W output power at 1990 nm. These results indicate that in-band pumping is a viable route to circumvent the thermal limitations associated with 793 nm diode pumping and provide a pathway for development of multi-kW laser sources in the 2 μm spectral window.
This paper aims to evaluate a comprehensive numerical model based on solving rate equations of a thulium-doped silica-based fiber amplifier. The pump power and thulium-doped fiber (TDF) length for single-pass thulium-doped fiber amplifiers (TDFA) are theoretically optimized to achieve the optimum gain and noise figure (NF) at the center of S-band region. The 1064 nm pump is used to provide both ground-state and excited state absorptions for amplification in the S-band region. The theoretical result is in agreement with the published experimental result.