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Optical fibre excitation by partially coherent sources
Springer Science and Business Media LLC - Tập 8 - Trang 545-556 - 1976
D. J. Carpenter, C. Pask
Sources for optical fibre excitation have previously been assumed to be either totally coherent or incoherent. This paper formulates the modal excitation problem for partially coherent sources. The modal excitation coefficients are given in terms of the source complex degree of coherence and numerical results and simple analytical expressions appropriate to multimode step index fibres are presente...... hiện toàn bộ
Performance optimization of RSOA based mm-wave radio-over-fibre access network
Springer Science and Business Media LLC - Tập 53 - Trang 1-14 - 2021
Eszter Udvary
In this paper, a Reflective Semiconductor Optical Amplifier based, Radio-over-Fibre access network configuration has been proposed to feed future millimeter-wave radio systems. The system architecture combines several approaches to overcome the challenges of millimeter-wave signal transmission. Reflective semiconductor optical amplifier modulator realizes a colorless and relatively cost-effective ...... hiện toàn bộ
Analysis of planar waveguides with index discontinuity or index slope discontinuity
Springer Science and Business Media LLC - Tập 33 - Trang 675-683 - 2001
Qing Liu, Zhuang Qi Cao, Qishun Shen, Xiaoming Dou, Yingli Chen
In this paper, we propose a novel analytic transfer matrix method (ATMM) to the analysis of planar waveguides with index discontinuity or index slope discontinuity, for the cases when the conventional WKB method is no longer valid. We also analyze the physical insight of the approximations in WKB theory, and according to our research, the phase shift at the turning point is not π/2, but exactly π....... hiện toàn bộ
Unsupervised learning method for events identification in φ-OTDR
Springer Science and Business Media LLC - Tập 54 - Trang 1-16 - 2022
Jie Zhang, Xiaoting Zhao, Yiming Zhao, Xiang Zhong, Yidan Wang, Fanchao Meng, Jinmin Ding, Yingli Niu, Xinghua Zhang, Liang Dong, Sheng Liang
In this paper, an unsupervised-learning method for events-identification in φ-OTDR fiber-optic distributed vibration sensor is proposed. The different vibration-events including blowing, raining, direct and indirect hitting, and noise-induced false vibration are clustered by the k-means algorithm. The equivalent classification accuracy of 99.4% has been obtained, compared with the actual classes o...... hiện toàn bộ
Assessing the quality of the excess chemical potential flux scheme for degenerate semiconductor device simulation
Springer Science and Business Media LLC - Tập 53 - Trang 1-10 - 2021
Dilara Abdel, Patricio Farrell, Jürgen Fuhrmann
The van Roosbroeck system models current flows in (non-)degenerate semiconductor devices. Focusing on the stationary model, we compare the excess chemical potential discretization scheme, a flux approximation which is based on a modification of the drift term in the current densities, with another state-of-the-art Scharfetter–Gummel scheme, namely the diffusion-enhanced scheme. Physically, the dif...... hiện toàn bộ
Improved performances of the organic light-emitting devices by doping in the mixed layer
Springer Science and Business Media LLC - Tập 35 - Trang 1149-1155 - 2003
W.B. Gao, J.X. Sun, K.X. Yang, H.Y. Liu, J.H. Zhao, S.Y. Liu
The brightness, efficiency and lifetime of organic light-emitting diodes (OLEDs) were remarkably improved by doping in a mixed layer. In this device, the emitting layer consists of a mixture of α-naphthylphenybiphenyl amine (NPB), tris (8-hydroxyquinolinolate) aluminum (Alq3) (referred to as the mixed layer) and an emissive dopant 5,6,11,12-petraphenylnaphthacene (rubrene), where the concentration...... hiện toàn bộ
Fiber optic evanescent field absorption sensor: Effect of fiber parameters and geometry of the probe
Springer Science and Business Media LLC - Tập 31 - Trang 625-636 - 1999
S.K. Khijwania, B.D. Gupta
A comparative experimental study of the fiber-optic evanescent field absorption sensor based on straight and U-shaped probes is presented. The effects of numerical aperture and the core radius of the fiber on the sensitivity of the sensor are experimentally investigated. Increase in the numerical aperture of the fiber increases the sensitivity of the sensor in the case of both the probes. The effe...... hiện toàn bộ
Super-continuum generation of an optical pulse in a silicon micro-ring resonator
Springer Science and Business Media LLC - Tập 48 - Trang 1-13 - 2016
S. Chiangga, S. Suwanarat, P. Phatharacorn, P. Yupapin
The super-continuum (SC) system of an optical pulse within a silicon micro-ring resonator is designed and simulated. A self-phase modulation within the device is a key process for an efficient SC generation, which can be used to create and recover the required maximum output SC peak power signals. The waveguide length is L1 = L3 = 0.15-cm-long, and LR = 15.5 µm, where in the simulation the input p...... hiện toàn bộ
Recent advances on all-optical photonic crystal analog-to-digital converter (ADC)
Springer Science and Business Media LLC - - 2022
Masoud Mohammadi, Forouzan Habibi, Mahmood Seifouri, Saeed Olyaee
A design for a nonreciprocal phase shifter
Springer Science and Business Media LLC - Tập 17 - Trang 195-199 - 1985
Y. Okamura, T. Negami, S. Yamamoto
A design is described for a nonreciprocal phase shifter, which is the key element in the constitution of a Mach-Zehnder interferometric isolator consisting of a magneto-optical channel waveguide. A four-layered structure waveguide is dealt with in which a cover layer having a larger refractive index than that of the film is placed on the magneto-optic thin film; it is revealed that the phase shift...... hiện toàn bộ
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