Question

Glass fibers have a minimum loss window for light transmission at 1.3 m and 1.55 m. These wavelengths determine the laser materials of choice for long distance optical communication. (a) List the various semiconductor combinations that can be used for lasers and detectors in such a system. (b) List only those materials that can be grown on GaAs and InP substrates with a strain of less than 1.5%. Using the virtual crystal approximation, estimate the electron effective masses of these materials.

Answer 1

1.Laser communication systems are used to transfer information from one point to a distant point.

2.Optical communication systems in the past consisted of techniques such as fire signals, smoke signals, flash lanterns, reflected sunlight and signal flags

The invention of the laser provided a coherent optical source capable of transmitting information at extremely high data rates.