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| Fiber Optic Splice Closure consists of a transmitter | |
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| Tweet Topic Started: Dec 22 2017, 08:45 AM (54 Views) | |
| MadgeHaley | Dec 22 2017, 08:45 AM Post #1 |
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Light source plays a significant part in a fiber optic communication system. The basic Fiber Optic Splice Closure consists of a transmitter, an optical fiber, and a receiver. The transmitter has a light source which is modulated by a suitable drive circuit in accordance with the signal to be transmitted. The choice of an optical source is determined by the particular application. For high speed fiber optic communication systems, which operate at speed higher than 1 Gbit/s, the selection of light source is even more critical. The source should meet several basic requirements. The first requirement is that it needs to emit a wavelength which corresponds to low loss window of fused silica, the most common optical fiber material, namely 1.3um and 1.5um windows. This is very critical since fiber links often operate at several tens of kilometers span without repeater. For a given optical power at the wavelength, lower fiber losses would lead to larger repeater spacings. The second requirement is high speed digital modulation. Current generation of fiber optic communication systems have reached speed to 40Gb/s and 100Gb/s. This requires the light source to be modulated at speeds in excess of 2.5Gb/s. To meet this requirement, two types of modulation methods have been developed. The DOME Fiber Closure is to directly modulate the light source at the speed desired. The second modulation type is to use a LiNbO3 external modulator. For the second type, the light source is required to give steady power output. |
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12:35 AM Jul 11