Equally c. More d. Unpredictably. The light coming out of the source is split by a beam splitter into two paths called the reference and sample arms of the interferometer. Hence, more protection is needed than copper ones.The optical fibers have many applications. A photodetector is a device which absorbs light and converts the optical energy to measurable electric current.
The band gap of AlGaAs is 1.92 eV while that of GaAs is 1.42 eV.
Optical Sources and Detectors . They have a central core surrounded by a concentric cladding with slightly lower refractive index. x��Zmo�6��_��p��WI��@7��Zlq��P`�^ۛ�ub�c'����2�8%9��x-�҈��yf������by,��n~�u�.��w���q�{,�?����zU|���������o��.��^Tŝ��Nj�MUPV�~��E���E͉P��� �(n.>^�s,g�%��䍾,K��.�M��ے��E93"7�[I{��ڊʙ�D��Z��iA���I��3=� ~*�Wk!h������.�JJ�����3�^������?�#���,����H�ł��xI��� �^3;���T����'���2���0�a���J �2R1�S�4^;ٷ�o�����ov���9��-��2Jں��4
Figure 1: Absorption coefficient of a direct and an indirect semiconductor a) Which curve belongs to the direct and which one belongs to the indirect semiconductor? In this article, you will find the Study Notes on Optical Sources & Detectors which will cover the topics such as Light Emitting Diode, Working of LED, Double Heterojunctions, Quantum Efficiency, Coupling of LED output to optical Fibre, LASER, Interaction of Radiation with Matter, Photodetectors, Population Inversion, Physical process in light detection, Performance parameters, Photodiode, LDR.
One of the ways in which light output in LEDs is increased is to use hetero-junction rather than homojunction. %����
OPTICAL SOURCES & DETECTORS Randhir Bhatnagar Chief Scientist, CSIR-CSIO, Chandigarh Emission of light, (in the form of a photon) can take place either spontaneously or it can be stimulated by the presence of another photon of the right energy level.
Tutorial on Optical Sources and Detectors April 24rd 2012 Problem 1: Direct and indirect semiconductors Figure 1 shows the absorption coefficients of a direct and an indirect semiconductor as a function of wavelength. This has led to introduction of multiple electronic parts, consideration of information treatment methods and visualization means. Radiometric concepts, symbols, units and nomenclature. Blackbodies and other radiation sources. Less b. /ON [486 0 R 487 0 R]
endstream Tutorial on Optical Sources and Detectors July 3rd 2012 Problem 1: Amplitude-phase coupling Modulating the injection current of a semiconductor laser affects both the real part and the imaginary part of the complex refractive index n n n j i within the active zone. .�i�����B����*p#���J�F����6�t�d����+��V��B�AȬ.AB&|2B&��T$�iNv#.K&�����B�~�����t2[��^���9�4��o?�O��0�_�s��ԀN�����|V����Ʊ�߅�����u֖v��Ӌ#ͱ/ߺ{�wm�ڄ��I��O_�3Y����&4g�Vܿ��]� ~�n��G���~�-A�>F�����BD#|v9=Kp �֥9ri�a�9;�yUN0��
The surface emitting LED can be coupled to a fibre by etching a well in a planar LED structure and bring the end of the fibre as close to the active layer as possible.
Some of them are as follows −Used in data link for computer networks, CATV SystemsUsed for connecting fire, police, and other emergency services.Used in hospitals, schools, and traffic management systems.They have many industrial uses and also used for in heavy duty constructions. They are −The communication system of fiber optics is well understood by studying the parts and sections of it. q The electron-hole recombination occurs in relatively wide layer = 10 μm.
The efficiency of an LED refers to the percentage of power output in relation to input. Hence, such a point is called as A light ray, if passed into a glass, at such condition, it is totally reflected back into the glass with no light escaping from the surface of the glass.Depending upon the material composition of the core, there are two types of fibers used commonly.
stream 1.3 Sources and detectors in optical electronic devices Over the last decades optical instruments have enabled a plenty of important applications where the human eye is not used as a receiving part of a system anymore.
The light propagation, along a waveguide can be described in terms of a set of guided electromagnetic waves, called as A fundamental optical parameter one should have an idea about, while studying fiber optics is For an optically dense material, if the reflection takes place within the same material, then such a phenomenon is called as If the angle of incidence $\phi _1$ is much larger, then the refracted angle $\phi _2$ at a point becomes Π/2 . 3 0 obj >> a. Further refraction is not possible beyond this point. ANSWER: (b) Equally
The need for relatively large detectors (10-20 µm) was driven by lack of detector sensitivity; the resulting reduction in resolution compared to the better films that had film grains of 2-3 µm was a consequence of this, rather than a technological limit to producing smaller detectors. The major elements of an optical fiber communication system are shown in the following figure.The basic components are light signal transmitter, the optical fiber, and the photo detecting receiver. We have already defined the internal quantum efficiency as a fraction of the electron hole pairs injected into the depletion layer which recombines to generate light.
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