The present invention provides systems and methods for processing calls over a network using a web page. The thigh component and shin component are pivotally joined along an axis of rotation coinciding with that of the prosthetic knee joint. Variation of the duty cycle of the pulses regulates the total amount of time in each cycle that the lamp is illuminated, with the aggregate \u201con\u201d time determining the apparent brightness of the lamp. The recording layer is formed in a concavo-convex shape in each servo area, with a servo signal unit portions formed as either a convex portions or a concave portions of the concavo-convex shape. The body is formed with an engagement groove, into which a caulking portion, which is formed by bending or flexing the one end of the housing, is engaged to integrally couple the body and the housing with each other. The pumping beam is introduced into the fibre laterally with respect to the optical axis of the fibre, and focused by the curvature of the fibre on a mirror formed by a polished end face so as to deflect it inside a numerical aperture cone of the optical fibre.