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Publisher Summary It is noted that semiconductor diode lasers have undergone years of refinement to satisfy the demands of a wide range of telecommunication systems that includes performance, reliability, and cost. To be specific, long-haul terrestrial and undersea systems demand reliability, speed, and low chirp, short-reach systems demand low cost, and finally analog cable TV systems demand high power and linearity. The history, the basic elements of device design and function, the applications, and the essential fabrication techniques of telecom lasers have been illustrated in the chapter. The four major classes of telecom lasers include analog, directly modulated, electroabsorption modulated, and wavelength-selectable. It is observed that many R&D institutions are developing low-capacitance device architectures to extend the device structures upto 40 Gb/s and beyond. It is also noted that along with higher functionality comes issues such as increased monolithic integration, need for closed loop electronic control, and architectural uncertainty. All of these issues, essentially, led to the development of tunable lasers. |
