A panel system incorporating a plurality of side by side panels which are joined to one another with tongue and slot connectors. A photodetector array, a multiport free-space optical isolator, and a strip of thin-film gain flattening filter are attached to a side surface of the planar lightwave circuit, which has a tunable optical power splitter for variably splitting the optical pump power for the laser diode between the two erbium doped fiber coils, and variable tilters for correcting the gain tilt of the amplifier. The first contacting member electrically connects to a signal wire of a cable for signal transmission, and the main member electrically connects to a ground wire of the cable. A tab is formed at the rear portion of the body, and has an inlet defined through the tab and in communication with the recess. The separator is capable of moving between the fractions upon centrifugation, and sealing the fractions from one another when centrifugation ends. A distance between the points is determined, and thee discrepancy in the width or length value is determined by comparison of the actual position and the desired position of the points.