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    On successful completion of this module you should be able to:
    Discuss the optical source used for designing optical transmitters.List some Critical Parameters of optical SourcesDiscuss how light-matter interact in semiconductorsDistinguish between LED and laser diode structures.List possible reasons for loss of photons.State what emission pattern of LED is.Indicate the most commonly used transmitters.Discuss the limitations of LED that can be overcome using a laser diode.Summarize the characteristic features of a Fabry-Perot cavity.