ABSTRACT
The development of optical fiber transmitter systems has spawned semiconductor lasers with broad bandwidths and high launch powers, features that should be equally attractive to optical wireless applications. To transmit light in an optical wireless communication link, a suitable light source is needed at the end of the transmitter circuit. The appropriate light source can be a light emitting diode (LED) or a laser diode (LD), is chosen depending on the specific application of the system. Both LEDs and LDs provide good brightness, small size, low drive voltage, and are able to emit a signal at a desired wavelength or range of wavelengths. Data retiming is useful in eliminating the pulsewidth distortion and jitter from the input data signal. The nonlinearity of the optical transmitter presents a primary limitation to the performance of an optical transceiver. Predistortion is divided into two subcategories: digital pre-distortion and analog predistortion.
