The present invention provides an improved optical assembly for use in an optical telecommunications system and an improved method for aligning the optical assembly. The inhibitors retard the occurrence of undesirable reactions of the alkylene carbonate with itself and impurities present in the pot, and hence greatly reduce or minimize the formation of undesirable by-products which otherwise tend to reduce overall yields of alkylene carbonate recovered by the distillation process. A pattern process is conducted to form a plurality of openings associated with the die units, whereby each die can be exposed via one of the openings. The downwardly angled surface forces the paneling section against the wall. A substrate holder includes a substrate holding surface that has at least one curve along the scanning direction matching a bend in the target substrate caused by the weight thereof, and this curve occurs in the direction perpendicular to the scanning direction. This method enables an overdrive scheme to be determined during use of the device.