The Fiber Optics Illustrated Dictionary - Part 80 fills a gap in the literature by providing instructors, hobbyists, and top-level engineers with an accessible, current reference. From the author of the best-selling Telecommunications Illustrated Dictionary, this comprehensive reference includes fundamental physics, basic technical information for fiber splicing, installation, maintenance, and repair, and follow-up information for communications and other professionals using fiber optic components. Well-balanced, well-researched, and extensively cross-referenced, it also includes hundreds of photographs, charts, and diagrams that clarify the more complex ideas and put simpler ideas into their applications context | Fiber Optics Illustrated Dictionary late 1980s and the 1990s and more recently has introduced Super DLTtape technologies that provide fast transfer-rate high-capacity storage on tape cartridges. See Super DLTtape. Quantum Flow Control QFC. In ATM networks a congestion avoidance scheme proposed for use on available bit rate ABR connections. For example in a network in which VCI tunneling is implemented the ATM device will send only after receiving explicit credit from a receiving ATM device at the other end of the connection. If tunneling is not used buffer allocation and a credit manager must be included. If the buffer allocation is exceeded noncomplying cells will be discarded. quantum mechanics The study of atomic structure and behaviors using various measuring instruments and techniques. See Heisenberg uncertainty principle quantum. quantum noise When using a detector to investigate quantum characteristics in electromagnetic phenomena there may be noise from random variations or fluctuations in the average rate of incidence of quantum interactions with the detector. These may be expressed in terms of photons. quantum well QW. A quantum phenomenon associated with a structure fabricated from ultrathin alternating layers of wide bandgap barrier and narrow bandgap well materials. When an electron is caught in a well formed between the barriers the probability of escaping the well is limited and the electron s energy level is affected. The quantization effects resulting from these events are related to the height and width of the fabricated barrier and can be derived through quantum mechanical calculations. Quantum well exhibiting structures can be constructed using crystal growth techniques for use in quantum cascade lasers for example . Quantum well components have unique properties that can be exploited for a variety of optical communications technologies. Quantum well physics can be used to create modulators through the application of an electrical field .
