Basic info about LED characteristics
What is the bit rate of the optical communication in LED?
#)The bit rate of the optical communication in LED is less than approximately 100-200 Mb/s.
What are the two basic LED configurations being used for fiber optics?
#)The two basic LED configurations being used for fiber optics are surface emitters (also called burrus or front emitters) and edge emitter.
Why the name double-heterostructure is used in LED?
#)The double-heterostructure device is used because of the two different alloy layers on each side of the active region.
What is lambertian pattern?
#)The isotropic pattern from a surface emitter is called lambertian pattern.
Why the alloys GaAIAs and InGaAs are to make LED?
#)The two alloys are chosen because it is possible to match the lattice parameters of the het6erostructure interfaces by using a proper combination of binary, ternary, and quaternary materials.
Under what wavelength the peak output powers can be obtained in LED?
#)The peak output powers for the LED can be obtained at any wavelength between 1.0 and 1.7 micrometer.
What is the quantum efficiencies of LEDs having double heterojunction?
#)The LEDs having double hetero junction structures can have quantum efficiencies of 60-80 percent.
What is internal quantum efficiency?
#)The internal quantum efficiency is the ratio of the radiative recombination rate to the total recombination rate.
What is the modulation band width of an LED?
#)The modulation band width of an LED can be defined in either electrical or optical terms normally, electrical terms are used since the band width is actually determined via the associated electrical circuitry.
How the frequency response of an LED is determined?
#)The frequency response of an LED is largely determined by three factors.
#)They are the doping level in the active region, the injected carrier life time in the recombination region, and the parasitic capacitance of the LED.
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