A laser transmitter comprising a laser diode and a monitoring photodiode adapted to receive a small part of a light signal of the laser diode and to derive therefrom an output current. The method also evaluates whether the access environment satisfies the necessary condition and activates a principal responsive to the evaluation and authenticates the actor against the principal. The voice services node queries a customer profile database to obtain a list of telecommunications services available to the subscriber. Appropriate placement of the diffuser plate, light sources, and back reflector can yield a backlight having exceptional thinness, brightness uniformity, and average brightness. As the result, an image is formed by ideal shape of dots D with high-quality.