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ABSTRACT: A new approach for filtering an optical band-pass in optical amplifier is proposed using a macro bending. The proposed filter leverages the bending loss of higher order modes at shorter wavelengths. At longer wavelengths, the filter increases fiber's bending loss as the fundamental mode 'tail' is leak out from the cladding. The combination of wavelength dependent loss at longer and shorter wavelength gives rise to the optical band-pass filter characteristic inside the fiber. The simulated spectral response of the filter is found to be in good agreement with the experimental results. Subsequently, the proposed optical band-pass filter is applied in Thulium-doped fiber amplifiers (TDFA) system for gain and noise figure enhancements. The filter functions to suppress both the amplified spontaneous emission (ASE) at 800 nm and 1800 nm wavelength regions and thus improves both gain and noise figure performances in S-band region. By bending of the gain medium, gain and noise figure of the TDFA are improved by about 2 dB and 0.5 dB respectively, within a wavelength region from 1440 and 1500 nm when the 1050 nm pump power is fixed at 250 mW.
Optics Express 12/2012; 20(28):29784-97. · 3.59 Impact Factor
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01/2011; , ISBN: 978-953-307-521-1
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Laser Physics Letters 07/2010; · 9.97 Impact Factor
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Progress In Electromagnetics Research 03/2010; · 5.30 Impact Factor
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ABSTRACT: The bending Diameter and depressed cladding erbium doped fiber (DC-EDF) length for single-pass depressed cladding Erbium-Doped Fiber Amplifiers (DC-EDFA) are theoretically optimized by solving differential equations. 22 dB peak gain at 1502 nm wavelength has been obtained with 18 m long DC-EDFA and 16 cm bending diameter.
Communications (MICC), 2009 IEEE 9th Malaysia International Conference on; 01/2010
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ABSTRACT: Gain and noise figure improvements are demonstrated in a shorter wavelength region of double-pass EDFA using a macro-bending approach. The EDF is wound in a small radius to suppress the amplified spontaneous emission at the longer wavelength in order to achieve a high amplification in the shorter wavelength. Gain enhancements of about 12 ~ 14 dB are obtained with macro-bending at wavelength region between 1480 nm and 1530 nm. The micro-bending also reduces the noise figure of the EDFA at wavelengths shorter than 1525 nm with maximum improvement of 25 dB.
PhotonicsGlobal@Singapore, 2008. IPGC 2008. IEEE; 01/2009
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S. A. Daud, S. D. Emami,
K. S. Mohamed,
N. M. Yusoff,
L. Aminudin,
H. A. Abdul-Rashid,
S. W. Harun,
H. Ahmad,
M. R. Mokhtar,
Z. Yusoff,
F. A. Rahman
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ABSTRACT: Gain and noise figure improvements are demonstrated in a shorter wavelength region of a double-pass EDFA using a macrobending
approach. The EDF is wound in a small radius to suppress the amplified spontaneous emission at the longer wavelength in order
to achieve a high amplification in the shorter wavelength. Gain enhancements of about 12–14 dB are obtained with macrobending
at the wavelength region between 1480 and 1530 nm. The macrobending also reduces the noise figure of the EDFA at wavelengths
shorter than 1525 nm with a maximum improvement of 25 dB.
Laser Physics 10/2008; 18(11):1362-1364. · 3.61 Impact Factor
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ABSTRACT: An efficient fluoride-based thulium-doped fiber amplifier (TDFA) is theoretically demonstrated using a dual pumping scheme.
Differential equations are solved directly in the theoretical analysis. An auxiliary pump at 1560 nm is used for ground-state
absorption to enhance the excited-state absorption provided by the main pump of 1050 nm and, thus, to improve the gain and
noise figure of the TDFA. A gain improvement of more than 10 dB is obtained at the 1470-nm region with the use of a 1560-nm
pump at 20 mW. A small signal gain as high as 30 dB is obtained at this region with 100 mW of a 1050-nm pump and 20 mW of
a 1560-nm pump using a 20-m of thulium-doped fiber. The corresponding noise figure is obtained at lower than 5 dB.
Laser Physics 07/2008; 18(8):977-982. · 3.61 Impact Factor
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ABSTRACT: An efficient fluoride-based thulium-doped fiber amplifier (TDFA) is theoretically demonstrated using a double-pass scheme. A reflector is incorporated in the double-pass TDFA to allow double propagation of the test signal in the gain medium and thus improve the gain of the TDFA. The small signal gain improvement of more than 15 dB is obtained in the 1465 nm region. A gain as high as 42 dB is obtained in this region with 300 mW of 1050 nm pump using 20 m of thulium-doped fiber. However, a noise figure penalty of approximately 1 dB is also obtained in this wavelength region. Differential equations are solved using the Runge–Kutta method in the theoretical analysis. The theoretical result is in agreement with the experimental result.
Optik - International Journal for Light and Electron Optics 121(14):1257-1262. · 0.51 Impact Factor
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ABSTRACT: Performance of a Bismuth-based Erbium-doped fiber amplifier is experimentally and theoretically investigated using 1480 nm pumping with double-pass scheme. In the theoretical analysis, the rate and power propagation equations are solved to examine the optimum length for the C-band operation as well as the gain and noise figure characteristics. The calculated small signal gain is 38 dB with gain variation of less than 3 dB. The measured gain is 4 dB lower due to spurious reflections which were ignored in the theoretical analysis. At input signal power of 0 dBm, a gain of 14.5 dB is obtained experimentally with gain variation of less than 1 dB within the wavelength region from 1530 to 1565 nm. The noise figure is less than 12 dB within this region.
Optics & Laser Technology.
