Fiber optics characterisation and transmission loss measurement
The objectives for this study are to compare the transmission signal characteristics from transmitter and receiver through different type of fiber optics by using the laboratory experiment set. Besides that, the attenuation loss for this fiber optics was compared and which is the best fiber optics f...
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| Format: | Academic Exercise |
| Language: | English English |
| Published: |
2009
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| Subjects: | |
| Online Access: | https://eprints.ums.edu.my/id/eprint/36618/1/24%20PAGES.pdf https://eprints.ums.edu.my/id/eprint/36618/2/FULLTEXT.pdf |
| Summary: | The objectives for this study are to compare the transmission signal characteristics from transmitter and receiver through different type of fiber optics by using the laboratory experiment set. Besides that, the attenuation loss for this fiber optics was compared and which is the best fiber optics for the transmission line among them was identified. All the fiber optics used was up to the length of 3.2 meter. The relationship between the voltage and current can be determined by adjusting the potentiometer at the fiber optics transmitter SO420 l-9L. The characteristics of the transmitting diode for wavelength 875 nm and 950 nm are similar, which is quadratic increased with x-axes variables. The frequency response for transmitter is linear for both wavelengths. But the frequency response of the transmission line is quadratic decreased as frequency increased. The upper limit frequency of the transmission line is 300 kHz and its determining factor is fiber optics detector. Plastics fiber optics type A, B and D show the clear increase of length-dependent attenuation as the fiber length and the wavelength increased. Compared to glass fiber type C, it has the lowest length-dependent attenuation but highest coupling attenuation among others. This is because the lost of the light absorption and cattering during the transmission are minima and thus low length-dependent attenuation. The high coupling attenuation is because of the loss at the broken end of fibcr optics during the cutting process and the loss at the connection between transmitter-fiber, fibcr-fiber and fiber-receiver. The coupling attenuation is not dependent on wavelength. Glass fiber optics (type C) is the best for optical transmission. |
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