Every optical link has a source of light in it. It may be a LED or a laser of some sort. With the exception of fibre lasers, a semiconductor diode generates the light. This chapter is concerned with the generation of light from LEDs and lasers. It begins with some semiconductor physics before going on to examine light generation from a variety of sources. Fibre lasers are also discussed.
KeywordsSemiconductor Fermi level Band-gap Diode Direct band-gap semiconductors Compound semiconductors Rate equations LED Heterojunction Laser Spontaneous emission Stimulated emission DFB laser VCSEL Lithium niobate Mach-Zehnder modulator
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