© 2018 by Taylor & Francis Group, LLC. The rapid growth in the development of optical networks requires small, inexpensive, and easy-to-integrate optical amplifiers for use as basic amplifiers (power boosters, in-line amplifiers to compensate for fiber loss, and optical receiver preamplifiers) and also as optoelectronic signal processing devices such as wavelength converters, optical switches, intensity and phase modulators, logic gates, and dispersion compensators.