ABSTRACT
Since its invention in 1962 [1-4], the semiconductor injection laser has emerged as an important device in many optoelectronic systems such as optical recording, high-speed data transmission through fibres, optical sensors, high-speed printing and guided wave signal processing. Perhaps the most important impact of semiconductor lasers is in the area of lightwave transmission systems where the information is sent through encoded light beams propagating in glass fibres. These lightwave transmission systems, which are currently being installed throughout the world, offer a much higher transmission capacity at a lower cost than coaxial copper cable transmission systems.
