Ditemukan 29 dokumen yang sesuai dengan query
Nur Hasanah
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Speckle Interferometry method capable for determining both the vibration amplitude and phase shifting So that double exposure for the vibration analysis applying speckle pattern interferometry is reported. Its method is recorded on a negative film using double-exposure; two object states which are peak and valley of the object vibration are recorded. The film with double exposure is then illuminated with coherent light, and each pair produces of speckle becomes the slits of Young's experiment With ...
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Depok: Fakultas Teknik Universitas Indonesia, 1994
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Supriadi
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Parallel-coupled wave-guide with symmetrical structure has interesting coupling characteristics and can be used as multiplexer/demultiplexer when certain working requirements are met. The coupling properties in the coupled wave-guide are analyzed theoretically on the basis of two mode interference effect of the propagating waves, wavelength dependence of wave-guide directional coupler is investigated in the coupling region. A rough approximation of the dependence is determined based on simplified transfer matrix multiplications followed by more detailed computer calculation ...
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Depok: Fakultas Teknik Universitas Indonesia, 1994
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Nasruddin MN
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ABSTRAK
A micro optical branching circuit [MOBC] array by the use of planar micro lens array and a cubical beam splitter was proposed in a previous study. To study further the performance of the elements of the branching array, the constructed circuit has been implemented by modulating three optical signals on different wave lengths of carrier waves transmitted by LD optical sources. The measurement on coupling efficiency gives a value of 36,4 % which is uniform ...
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1992
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Simbolon, Toga Walter
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In this research work an experiment on the application of fiber sensor for measuring an acoustic vibration has been carried out. A light beam from He-Ne laser source was into two arms of Mach tender Interferometer. Each arm of the interferometer was a piece of optical fiber with a length of 2 m.
The beam transmitting through the sensing arm was modulated in phase by an acoustic vibration produced by a signal generator. The output of ...
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Depok: Universitas Indonesia, 1990
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Mohammad Amir
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Development of optical fiber communication system is mainly due to the progressive influence of optical source. Laser diode as optical source in optical transmission system is of great attention because laser diode produces coherent monochromatic-light. Furthermore, laser diode has a high quantum efficiency, can be modulated at a very high speed, has small size and compact. The application of such optical source is also wide, ranging from optical signal communication to radar optics. Therefore, laser ...
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Depok: Fakultas Teknik Universitas Indonesia, 1988
T56
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Kaunang, John Poerwadi
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ABSTRACT
Recently, there -is a rapidly grow in the field of optical fiber communications, particularly in the technology of fiber waveguide which is used as transmitting media or communication lines. 'Due mayor problem in optical waveguide systems is the coupling loss in connectors or couplers for the purpose of gaining maximum coupling efficiency. This research is dedicated to obtain an efficient wavegui de devi ce by studyi ng the applicability of cone-shaped fiber end-face as fiber ...
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1988
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UI - Tesis Membership Universitas Indonesia Library
Tampubolon, Berlian
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A fabrication and application of planar micro-lens is presented in this thesis. With the goal of alignment free of the optical component, a branching circuit have been considered.
Even now, the alignment of optical components is still a problem. The advantages of the branching circuit consists of planar micro-lens is easy to connect with other optical component. Since integration of optical subsystems which allows the easy alignment and high efficiency is strongly required for future networks. ...
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Depok: Universitas Indonesia, 1996
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Janizal
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ABSTRAK
A parallel optical switching system using array structure of planar microlens was developed. The optical switching device is much simpler and low costly compared with the electronic one because it is not necessary to convert optical signals to the electronics, execute the interchange and then reconvert back to optics. The concept of parallel optical switching is constructed by using array structure of planar microlens. Aligning on array form and making match between each lens input-output ...
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1993
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Antonius Suhartomo
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The advantages optical fiber in communication field are widely utilized in developing steps from electrical communication to optical communication. Optical fiber communication promise extremely high data rate over long distance transmission without needing to amplify and retransmit along the way. It is well understood that if frequency of the transmitted signals. is increased some problems such as electromagnetic interferences. crosstalk and signal distortions will appear. Those difficulties can. be solved or eliminated by using optical ...
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Depok: Universitas Indonesia, 1993
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Hidayat Wiriadinata
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A nonconductor optical technique, having lateral resolution of about 5 μm and vertical resolution of about 0.09 μm, for surface profile (roughness) measurement was studied. It based on a heterodyne interferometer in which two orthogonal polarized beams of slightly different frequencies were used in a modified interference microscope. The beams scanned the surface of a work piece, and the reflected beams were allowed to interfere with one another. The phase of the beat frequency of ...
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Depok: Universitas Indonesia, 1992
T-Pdf
UI - Tesis Membership Universitas Indonesia Library
