The optical and electrical properties of a photonic-plasmonic nanostructure on the back contact of thin-film solar cells were investigated numerically through the three-dimensional (3D) finite-difference time-domain method and the 3D Poisson and drift-diffusion solver. The focusing effect and the Fabry-Perot resonances are identified as the main mechanisms for the enhancement of the optical generation rate as well as the short circuit current density. However, the surface topography of certain nanopattern structures is found to reduce the internal electrostatic field of the device, thus limiting charge collection. The optimized conditions for both optics and electronics have been analyzed in this paper.
Full-vectorial finite element method based eigenmode solver and imaginary-distance beam propagation method are developed for analyzing modal leakage characteristics of microstructured fibers and photonic band gap fibers. In both schemes the curvilinear hybrid edge/nodal elements based on linear tangential and quadratic normal vector basis functions are adopted to accomplish the computational window divisions and perfectly matched layer (PML) is incorporated as the boundary condition to absorb waves out of the computational window. The two schemes give consistent results for the numerical examples considered and the validity and usefulness of this work are demonstrated. Comparison with published results is shown.
In the future digital video transmission, a multichannel subcarrier multiplexed system with M-ary quadrature- amplitude-modulation (M-QAM) signals over fiber-optic transmission is an excellent candidate. A system using 1.3 micrometers semiconductor optical amplifiers (SOAs) for increasing the span length or for power splitting is very economical at the situations of the penetration of 1.3-micrometers single-mode fiber with the having installed 1.3-micrometers optical transmitters. However, the significant intermodulation distortions (IMDs) resulted from the signal-induced carrier density modulation of SOA limits the system capability, including channel capacity and power budget. A method using the external light injection to the SOA used in a 77-channel 64-QAM signal transmission system as an in-line amplifier is capable of increasing system power budget. From the viewpoint of system design, two approaches are addressed, one is the optimization of the in-line SOA used the external light injection, the other is the consideration of the optical modulation index per channel (OMI/ch) applied to transmitted. From the experimental results, the pumping wavelength and the pump power in approach one are mainly decided by the requirement of BER and the dynamic range of SOA, in addition, choosing the pump resulting in a smaller accompanied signal gain reduction can enlarge the system power budget. In approach, the optimum position of the in- line SOA incorporated is determined by the value of applied OMI/ch.
Conference Committee Involvement (7)
Integrated Optics: Design, Devices, Systems, and Applications VIII
7 April 2025 | Prague, Czech Republic
Integrated Optics: Design, Devices, Systems, and Applications VII
24 April 2023 | Prague, Czech Republic
Integrated Optics: Design, Devices, Systems and Applications VI
19 April 2021 | Online Only, Czech Republic
Integrated Optics: Design, Devices, Systems and Applications
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