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Optical Networks - _Summary2_30

Optical Networks - _Summary2_30 - 106 Propagation of...

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106 Propagation of Signals in Optical Fiber long times) to relieve strain and hence does not suffer the chemical surface changes that afflict strained glass. Plastic optical fiber has been in the home for decades. For example, the Sony/Philips Digital Interconnect Format (S/PDIF) interfaces are used to carry audio signals between devices and stereo components. The physical medium can be optical fiber using the TOSLINK R (TOShiba-Link) standard. This application uses step- index polymethyl methacrylate (PMMA) fibers whose 1 mm total diameter consists of a 980 micron diameter plus 10 micron thick cladding ring. The core index is 1.49 and the cladding index is 1.42. The bit rate-distance product is 10 MHz-km. Because of the short distances of the applications, the bandwidth limitations have typically not come from the fiber but from the speed of the transmitters, which are 650 nm LEDs. The material does not transmit in the infrared, thus disallowing the use of 850 nm VCSEL transmitters used in gigabit per second data communications.
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