An 8 km optical fibre link consisting of graded-index fibre has a multimode rms pulse broadening of 172 ps. The fibre has a relative core-cladding refractive index difference of 1.2%. What is the core axis refractive index? O Nco 1.552 %3D nco =0.002 nco=1.466 -1.485

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Thermistors

A thermistor is a special type of resistor whose resistance is more temperature-dependent than standard resistors.  The resistance of the thermistor decreases with increasing temperature. This is the basic principle of thermistors. This allows the thermistor circuit to detect very small temperature changes that cannot be observed with the Resistance temperature detectors (RTDs) or the thermocouples. Since the resistance of a thermistor is temperature dependent, it can be connected to an electrical circuit to measure body temperature. This high sensitivity to temperature changes makes thermistors very useful for accurately controlling and calibrating temperature measurements. In general, resistance increases with increasing temperature in most metals, but thermistors react negatively.