Abstract: This article explains, in laymen's terms, the growing importance of optic-based telecommunications and describes the various standards (SDH, SONET, and FDDI) that are being used to implement this technology. As a young technology, improvements can be made to both improve the performance of the technology and reduce costs in manufacturing process. Digital potentiometers provide a means to set critical laser driver and feedback circuits for optimal performance. Temperature sensing mechanisms inside these pots can be used to monitor and compensate these circuits for any parametric changes that may occur as a function of temperature. These digital potentiometers can also be used to automate production calibration procedures once performed manually using mechanical potentiometers or handpicked fixed resistors. This not only reduces the production cost of these laser drivers, but also can be used to improve the reliability and quality of the devices by removing the element of human error from the calibration process. Dallas Semiconductor potentiometers discussed include the DS1845, DS1846, DS1847, and DS1848.
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