IET Optoelectronics
Volume 9, Issue 3, June 2015
Volumes & issues:
Volume 9, Issue 3
June 2015
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- Author(s): Md. Ghulam Saber and Rakibul Hasan Sagor
- Source: IET Optoelectronics, Volume 9, Issue 3, p. 125 –130
- DOI: 10.1049/iet-opt.2014.0027
- Type: Article
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p.
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A theoretical study of nano-plasmonic couplers constructed using aluminium arsenide (AlAs) and alumina (Al2O3) is presented. The analysis has been done using the finite difference time domain technique. The dependence of coupling efficiency on the width of the air layer of silver–air–silver waveguide has been investigated to determine the optimal width of air. Coupling efficiency with the variation in input signal wavelength, reflection coefficient and return loss have been calculated numerically in order to characterise the performance of AlAs and Al2O3 as nano-plasmonic couplers. The resonant peaks have also been obtained for both AlAs and Al2O3. The couplers provide appreciable performance at 1550 nm wavelength and have simple rectangular shape with no tapering which provides advantage in the fabrication process. It also offers broadband operation.
- Author(s): I.M. Babar ; M.B.S. Sabran ; Sulaiman Wadi Harun ; Harith Ahmad ; M.C. Paul ; Arindam Halder ; Shyamal Das ; S.K. Bhadra
- Source: IET Optoelectronics, Volume 9, Issue 3, p. 131 –135
- DOI: 10.1049/iet-opt.2014.0042
- Type: Article
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p.
131
–135
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Simple and low cost passive Q-switched thulium–ytterbium co-doped fibre lasers (TYFL) operating at 1977.5 nm is demonstrated using 905 nm multimode pumping, in conjunction with a multi-walled carbon nanotubes (MWCNTs) saturable absorber. It uses a new octagonal shaped double-clad thulium ytterbium co-doped fibre, manufactured using a modified chemical vapour deposition process and a solution doping. The Tm3+ and Yb3+ cladding absorptions of the fibre are 0.325 and 3.3 dB/m at 790 nm and 976 nm, respectively. The MWCNTs composite is prepared by mixing the MWCNTs homogeneous solution with a diluted polyvinyl alcohol polymer solution before it is left to dry at room temperature to produce thin film. The film is sandwiched between two fibre connectors and integrated into the laser cavity for Q-switching pulse generation. The repetition rate of the Q-switching pulse can be tuned from 18.8 to 50.6 kHz while the pulse width reduces from 8.6 to 1.0 µs as the pump power increases from 1.6 to 2.3 W. At the pump power of 2.1 W, the TYFL produces the maximum pulse energy of 5.7 nJ.
- Author(s): Md. Rajibul Islam ; Muhammad Mahmood Ali ; Man-Hong Lai ; Kok-Sing Lim ; Dinusha Serandi Gunawardena ; Venkata Rajanikanth Machavaram ; Harith Ahmad
- Source: IET Optoelectronics, Volume 9, Issue 3, p. 136 –140
- DOI: 10.1049/iet-opt.2014.0056
- Type: Article
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136
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This study reports on the demonstration and characterisation of a short cavity fibre Fabry-Perot resonator (FPR) for the detection of ultrasonic waves propagating through a solid medium over a frequency range of 1 kHz–10 MHz. The proposed sensing device has some outstanding features in terms of simple fabrication technique, frequency response and high sensitivity over a wide frequency range. The response of the surface-mounted FPR sensor showed good agreement with that of a commercially available piezoelectric transducer during ultrasonic excitation.
- Author(s): Yu-Chun Hsueh ; Sheng-Che Chiou ; Sham-Tsong Shiue
- Source: IET Optoelectronics, Volume 9, Issue 3, p. 141 –144
- DOI: 10.1049/iet-opt.2014.0025
- Type: Article
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141
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The viscoelastic behaviour of commercial polymeric coatings for optical fibres is measured at room temperature using dynamic mechanic analysis, and the relationship between strain and stress in polymeric coatings is obtained. The thermally induced viscoelastic stresses in dual-coated optical fibres are derived from the viscoelastic behaviour of commercial polymeric coatings. The compressive radial stress on the glass fibre surface produces microbending losses, which can be diminished by properly choosing the thickness and material properties of polymeric coatings. The design of dual-coated optical fibres to diminish thermally induced microbending losses caused by viscoelastic behaviour of polymeric coatings is proposed. The thermally induced microbending loss in dual-coated optical fibres evaluated by Maxwell model is underestimated.
Design and study of nano-plasmonic couplers using aluminium arsenide and alumina
Q-switched thulium–ytterbium co-doped fibre laser using newly developed octagonal shaped inner cladding double-clad active fibre and multi-walled carbon nanotubes passive saturable absorber
Wide-range in-fibre Fabry-Perot resonator for ultrasonic sensing
Minimisation of thermally induced microbending losses in dual-coated optical fibres caused by viscoelastic behaviour of commercial polymeric coatings
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