1. OPERATIONAL
PARAMETERS OF
SWITCHING DEVICES
BY:
ANKUR MAHAJAN
M.E. I&C (REGULAR)
ROLL NO. 112505

2. OBJECTIVE OF SEMINAR
 List important operational parameters of
switching devices.
 Comparison among different switching devices
on the basis of these parameters.

3. OPERATIONAL PARAMETERS
(1) Operating wavelengths
LED and AlGaAs LASER have wavelength between .8 and .9 um.
However advantage may be gained at the detector from
generating source with operating wavelength above 1.1 um as
both fiber attenuation and dispersion is reduced.
(2) Linearity
LED and Photodiodes has linear response while Injection LASER
response is non linear.
(3) Low cost
The simple construction of LED and photo detector reduce the cost
of construction but Injection LASER has high construction cost.

4. OPERATIONAL PARAMETERS(CONT.)
(4) Reliability
LED does not exhibit catastrophic degradation and has proven
less sensitive to gradual degradation than Injection LASER. Photo
detectors are reliable at room temperature.
(5) Temperature dependence
The LED characteristic is less effected by temperature than
corresponding characteristic of ILD. The temperature dependence
is maximum for photo detectors.
(6) Drive circuitry
LED and ILD does not require driver circuit, this is due to lower
driver current and reduced temperature dependence but
characteristics of photo detectors changes with temperature
therefore compensation of temperature effect is necessary.