The term LED full form stands for a light-emitting diode is used in suited for short-range narrow and medium bandwidth links. LED can be suitable for the digital system technology up to 140 Mb / sec. Here this post gives information about the advantages and disadvantages to know more about LED.
Advantages of LED :
- LEDs produce more light per watt
- LED is more efficient
- Lower initial cost
- Simple design
- LED doesn't change their light tint as the current passing through them is lower
- Ease of manufacture
- Simpler fabrication
- Simple drive circuitry
- Simple system integration
- Linear light output against current characteristics.
- High reliability
- Less temperature dependent
- LED will achieve full brightness in few microseconds
- LED does not contain mercury, unlike compact fluorescent lamps
- Excellent CRI ( Color rendering index )
- Environmental friendly
- Quick turn ON and OFF
- Good adaptability to coherent laser operation
- No warm-up period
- Not affected by cold temperature
Disadvantages of LED :
- Refraction of light at semiconductor/air interface
- The average lifetime of radiative recombination is only a few nanoseconds, therefore, modulation BW is limited to only a few hundred megahertz
- Low coupling efficiency-usually low optical power coupled into the fiber (W)
- Large chromatic dispersion
- Driving LED hard in ambient temperature may result in overheating of the LED package, eventually leading to device failure
- Incoherent light source
- Spontaneous emission and non-linear output characteristics
- Little effective in a wide area
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