IET Optoelectronics
Volume 12, Issue 5, October 2018
Volumes & issues:
Volume 12, Issue 5
October 2018
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- Author(s): Ali Akhavan ; Hassan Ghafoorifard ; Saeed Abdolhosseini ; Hamidreza Habibiyan
- Source: IET Optoelectronics, Volume 12, Issue 5, p. 220 –227
- DOI: 10.1049/iet-opt.2018.0028
- Type: Article
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p.
220
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In this study, a compact plasmonic structure for realising plasmon-induced transparency is proposed and numerically investigated by using the finite-difference time-domain method. The suggested device consists of double side-coupled square ring resonators based on a metal–insulator–metal platform. The coupled mode theory is introduced to describe the spectral response of the proposed structure, which is verified by numerical simulations. By changing the geometrical and material parameters such as outer side length and width of square ring resonators and metal collision frequency, the transmission characteristics can be easily tuned. The simulation results show that the proposed plasmonic system is used as a sensor by filling the insulator region with different refractive index. The sensitivity and figure of merit of this sensor are calculated, 806 nm/RIU and 66 RIU–1, respectively. It is found that the slow light effect can appear in the proposed structure. By design optimisation, the maximum value of the group index is achieved close to 65. Meanwhile, the group index profile is obtained for different values of geometrical parameters like coupling aperture widths. The proposed structure provides a new way to utilise in nanosensor devices and slow light systems.
- Author(s): Vasile Z. Tronciu ; Hans Wenzel ; Mindaugas Radziunas ; Matthias Reggentin ; Jörg Wiedmann ; Andrea Knigge
- Source: IET Optoelectronics, Volume 12, Issue 5, p. 228 –232
- DOI: 10.1049/iet-opt.2018.0025
- Type: Article
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p.
228
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The authors report theoretical and experimental results on the properties of distributed Bragg reflector semiconductor lasers. Using the traveling wave equation model, they show that a proper choice of coupling coefficient and front facet reflectivity allows an optimisation of the laser operation, such that for wide range of injected current into the active region the laser emits a temporally stable output power. The numerical results are in a qualitative agreement with the measured characteristics.
- Author(s): Jau-Ji Jou ; Tien-Tsorng Shih ; Zhe-Xian Su ; Chuan-Yu Liao ; Wei Wang
- Source: IET Optoelectronics, Volume 12, Issue 5, p. 233 –238
- DOI: 10.1049/iet-opt.2018.0027
- Type: Article
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233
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Here, a directly modulated coaxial distributed feedback (DFB) laser diode (LD) transmitter optical subassembly (TOSA) module is proposed for 25 Gb/s non-return-to-zero (NRZ) and 50 Gb/s four-level pulse amplitude modulation (PAM-4) transmissions. A low-cost TO-56 header was used in the DFB LD TOSA package. The high-frequency performance of the coaxial 1310 nm DFB LD TOSA module was simulated and analysed. The simulated frequency response can correspond with the measured result, and the 3 dB bandwidth was 19 GHz. In the back-to-back and 10 km signal mode fibre transmissions, 25 Gb/s NRZ and 50 Gb/s PAM-4 eye diagrams of the DFB LD TOSA were measured. Clear 25 Gb/s NRZ and 50 Gb/s PAM-4 eye openings can be observed. For 25 Gb/s NRZ transmissions, the received sensitivity was −11.8 dBm under a bit error rate (BER) of 10−12. For 50 Gb/s PAM-4 transmissions, the BER was estimated to be below the forward error correction threshold. The low-cost coaxial DFB LD TOSA is suitable in 100, 200, and 400 Gb/s transmissions.
- Author(s): Nguyen Dong-Nhat ; Lim Nguyen ; Amin Malekmohammadi
- Source: IET Optoelectronics, Volume 12, Issue 5, p. 239 –243
- DOI: 10.1049/iet-opt.2018.0003
- Type: Article
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239
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This study presents the external modulation and direct detection of duobinary signal in optical access networks at 25 and 50 Gb/s with the use of first-order optical equaliser at the transmitter output (pre-equalisation) to compensate the waveform distortion induced by fibre dispersion. The first-order optical equaliser is then replaced by second-order optical equaliser to further improve the bit error rate (BER) performance and extend the maximum transmission distance by compensating the residual dispersion for the first time. The authors explain the enhancement in the BER by analysing the eye diagrams and optical spectra. The authors also investigate non-return-to-zero signal with similar setup parameters for reference.
- Author(s): Haraprasad Mondal ; Mrinal Sen ; Chandra Prakash ; Kamanashis Goswami ; Champak Kumar Sarma
- Source: IET Optoelectronics, Volume 12, Issue 5, p. 244 –248
- DOI: 10.1049/iet-opt.2018.0020
- Type: Article
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p.
244
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An impedance matching theory-based methodology is presented in this study for designing/optimising photonic crystal-based all-optical AND gate. A basic architecture for the AND gate is projected first, and thereafter the same is optimised utilising the proposed methodology. Performance of the AND gate is evaluated based on several metrics that are calculated using a finite-difference-time-domain simulation. The optimised AND gate has exhibited a high extinction ratio in the order of 6.9 dB, within a very small footprint of . It also supports propagation of a high bit rate (≈1 Tb/S) and has a wide operational bandwidth (≈4 THz), which make the device suitable for different photonic integrated circuit applications.
- Author(s): Sedigheh Pirsalami ; Seyed Mojtaba Zebarjad ; Habib Daneshmanesh
- Source: IET Optoelectronics, Volume 12, Issue 5, p. 249 –253
- DOI: 10.1049/iet-opt.2018.0005
- Type: Article
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249
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Transparent conductors (TCs) have applications in numerous electronic and optoelectronic devices and are commonly ranked by a parameter known as figure of merit (FoM). In this study, TCs from copper networks are prepared by a combination of electrospinning and DC-magnetron sputtering and their performance is evaluated and compared by conventional FoMs. Also, the novel concept of ‘application-oriented’ FoM is introduced and accordingly a new FoM is defined. This FoM is based on the fundamental requirements of transparency, conductivity and flexibility; each represented in terms of optical transmittance, sheet resistance and the new parameter ‘threshold bending radius’, respectively. The proposed FoM identifies TCs with improper, optimum and over-qualified performance for a desired application. It is shown that this FoM is a more justified criterion for rating TCs for practical means compared to previously defined FoMs.
- Author(s): Ying Jiang and Mingjin Yu
- Source: IET Optoelectronics, Volume 12, Issue 5, p. 254 –257
- DOI: 10.1049/iet-opt.2018.5016
- Type: Article
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254
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The influence of birefringence fibre (BF) loop mirror (Bi-FLM) length on the light intensity sensitivity to strain was analysed theoretically and investigated experimentally. The same type of BF but the different length was chosen as the sensing element to be glued to the test object. The relationship between the light intensity and strain was obtained for the Bi-FLM with different BF length. Afterwards, the light intensity signals were converted into voltage signals. The influence of BF length on the average voltage sensitivity to strain was investigated experimentally. The experimental results indicate that the Bi-FLM with a long BF has a high average voltage sensitivity to strain but a small strain measurement range, while the Bi-FLM with a short BF has a low average voltage sensitivity to strain but a large strain measurement range. From the experiments carried out, it was seen that the average voltage sensitivity to strain can be improved by increasing the BF length. This method does not increase the system complexity.
- Author(s): Sofien Mhatli ; Hichem Mrabet ; Abdelkerim Amari
- Source: IET Optoelectronics, Volume 12, Issue 5, p. 258 –262
- DOI: 10.1049/iet-opt.2018.5041
- Type: Article
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p.
258
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In this study, a performance comparison of fibre non-linearity mitigation is performed in the context of 10 and 20 Gb/s coherent optical orthogonal frequency-division multiplexing and wavelength division multiplexing (CO-OFDM-WDM). The authors compare two regression methods based on the third-order Volterra series and least mean square algorithm in terms of the bit error rate (BER) for different transmission distances and modulation formats. They also evaluate the BER as a function of the number of OFDM subcarriers for the Volterra-based non-linear equaliser (VNLE). In addition, by increasing the order of the VNLE from third-order to fifth-order series, a significant increase of performance is obtained for 100 Gb/s CO-OFDM-WDM system. Likewise, a comparison study of 16-QAM 40 Gb/s CO-OFDM system is performed as a function of Q-factor for support vector machine, Volterra equaliser and linear equaliser, respectively.
Metal–insulator–metal waveguide-coupled asymmetric resonators for sensing and slow light applications
Investigation of red-emitting distributed Bragg reflector lasers by means of numerical simulations
Low-cost coaxial DFB LD transmitter optical subassembly for 25 Gb/s NRZ and 50 Gb/s PAM-4 transmissions
Using duobinary with first- and second-order optical equalisers for extending transmission distance of optical access networks
Impedance matching theory to design an all-optical AND gate
Figures of merit for transparent conductors from copper networks prepared by DC-magnetron sputtering of electrospun templates
Influence of birefringence fibre length on demodulation sensitivity based on a fibre loop mirror sensor
Extensive simulation of fibre non-linearity mitigation in a CO-OFDM-WDM long-haul communication system
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