IET Optoelectronics
Volume 12, Issue 6, December 2018
Volumes & issues:
Volume 12, Issue 6
December 2018
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- Author(s): O.M. Kharraz ; A.S.M. Supa'at ; A. Atieh ; A.K. Zamzuri ; M.A. Mahdi
- Source: IET Optoelectronics, Volume 12, Issue 6, p. 263 –268
- DOI: 10.1049/iet-opt.2018.5029
- Type: Article
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p.
263
–268
(6)
This study proposes an enhanced gain saturation model of non-linear semiconductor optical amplifiers (SOAs) by incorporating material-dependent gain compression factor. The rate equations are utilised with the extra gain compression term for Indium–Gallium–Arsenide material-based SOA to account for the steep relaxation oscillations behaviour of non-linear SOAs. The proposed gain saturation model is verified with experimental results that showed very good agreements with a mean square error of 0.094.
- Author(s): Michalis P. Ninos ; Hector E. Nistazakis ; Harilaos G. Sandalidis ; Argyris N. Stassinakis ; George S. Tombras
- Source: IET Optoelectronics, Volume 12, Issue 6, p. 269 –272
- DOI: 10.1049/iet-opt.2018.5055
- Type: Article
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p.
269
–272
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The authors consider a point-to-point optical wireless communication link with on–off keying (OOK) modulation scheme. The propagation is deteriorated by the joint effects of gamma–gamma atmospheric turbulence and misalignment induced fading described by a non-zero boresight pointing error model. Mathematical expressions are derived for the average block error rate and their accuracy is verified through numerical simulations with Monte Carlo method.
- Author(s): Gabriela Alejandra Romero-Munoz ; Kyuntak Kim ; Kyesan Lee
- Source: IET Optoelectronics, Volume 12, Issue 6, p. 273 –279
- DOI: 10.1049/iet-opt.2018.5046
- Type: Article
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p.
273
–279
(7)
In this study, the authors propose an enhanced inter-lighting interference cancellation (E-ILIC) in order to distinguish the received signals, combating the equal powers at the receiver side and hence improve the average bit error rate (BER) performance of a multiple-input-single-output visible light communication (VLC) system. VLC is a promising technology for indoor environments, it makes use of the light emitting diode (LED) lamps already installed to transmit information through the visible light. When several LEDs transmit simultaneously different data to increase the transmission capacity, it leads to co-channel interference that degrades the BER performance. For this reason, they investigate E-ILIC that is a combination of ILIC with closed loop power control to receive the signals with different power level. It employs power allocation at the transmitter when the received power ratio does not comply with a specific threshold. Furthermore, it reduces significantly the interference between adjacent LED lamps, obtaining useful information at the receiver side. Through computer simulations, E-ILIC achieves the best average BER performance in any user position when the assignment of the power weights is correctly performed on the LEDs.
- Author(s): Kousik Bishayee ; Shantanu Mandal ; Arindum Mukherjee ; B. N. Biswas ; Chandan K. Sarkar
- Source: IET Optoelectronics, Volume 12, Issue 6, p. 280 –288
- DOI: 10.1049/iet-opt.2018.5025
- Type: Article
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p.
280
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This study introduces the concept of dynamic controlled bandpass filter (BPF) to achieve improved synchronisation capability of a single-loop optoelectronic oscillator (OEO) under the effect of externally applied angle modulated signal. The governing equation for synchronisation ability of an OEO using dynamic control BPF has been derived. Theoretical study and comparison of locking capability enhancement using this dynamic BPF over a conventional static BPF are provided which is properly validated by simulation. Finally, the ability of frequency modulation to amplitude modulation conversion has been compared by measuring the total harmonic distortion values of the reconstructed signals.
- Author(s): Ignacio Marin-Garcia ; Victor Guerra ; Patricia Chavez-Burbano ; Jose Rabadan ; Rafael Perez-Jimenez
- Source: IET Optoelectronics, Volume 12, Issue 6, p. 289 –292
- DOI: 10.1049/iet-opt.2018.5052
- Type: Article
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p.
289
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Visible light communication (VLC) technologies are becoming a method to communicate with a wide range of devices. One of VLC's biggest proposed advantages is the inherent security that this technology provides. The concept of securing on VLC is based on its indoor use since optical radiation is confined by walls. However, doors and windows are usually present in any inhabited structure through which the optical signal can leak and be detected by external devices. In this study, the signal leaked through such a window and the risk of eavesdropping the VLC-based channel may have is studied. In this way, a risk evaluation parameter, which includes different variables, is proposed and analysed.
- Author(s): Hichem Mrabet ; Sofien Mhatli ; Iyad Dayoub ; Elias Giacoumidis
- Source: IET Optoelectronics, Volume 12, Issue 6, p. 293 –298
- DOI: 10.1049/iet-opt.2018.5042
- Type: Article
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p.
293
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All-optical orthogonal frequency division multiplexing (AO-OFDM) and optical code-division multiple-access system (OCDMA) are combined in the first analytical model, which considers subcarrier hopping by means of advanced two-dimensional (2D) hybrid-coded (2D-HC) signature. The model incorporates probabilistic subcarrier overlapping, multiple-access interferences and is tested, for the first time, over amplifier-free long-reach passive optical networks (LR-PONs) using cost-effective intensity modulations and direct detection. For the upstream direction at 40 Gb/s, AO-OFDM-OCDMA outperforms a ‘classical’ multi-channel OCDMA system for low received powers and any number of simultaneous users. In comparison to conventional 1D Walsh–Hadamard, 1D prime code and 2D prime hop system, coding with 2D-HC can improve the performance of AO-OFDM-CDMA, thus allowing a higher number of simultaneous users in LR-PON without optical amplification. From numerical simulations, the authors show that 16-quadrature amplitude modulation (16-QAM) AO-OFDM-CDMA with 45 users has comparable performance to conventional multi-channel 16-QAM coherent optical OFDM in the downstream direction and up to 58 km with 1:45 split ratio, without employing complex coherent technology. Similarly, based on the feasibility of physical implementation configuration, a budget power calculation is performed showing 108 km as maximum reachability distance for 40 Gb/s QAM signal, 1:64 split ratio when considering standard forward-error-correction.
Enhanced gain saturation model of non-linear semiconductor optical amplifiers
Block error rate performance of OOK free-space optical links over gamma–gamma turbulence channels with generalised non-zero boresight pointing errors
Enhanced inter-lighting interference cancellation using power control to improve the performance of indoor visible light communication systems
Study on synchronisation capability enhancement of optoelectronic oscillator using dynamic control bandpass filter
Evaluating the risk of eavesdropping a visible light communication channel
Performance analysis of AO-OFDM-CDMA with advanced 2D-hybrid coding for amplifier-free LR-PONs
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