Circuitry for a node of an optical communication network has a mux andor a demux. The computer system further receives transaction information from a mobile wallet application associated with the customer which includes an indication of items that are to be purchased, an indication of the amount that is to be paid, and an indication that payment is to be made from a stored value account associated with the customer. There may also be optics situated near the proximal end of the elongated body and configured to receive light from the first and second waveguides and to transmit the received light through the at least one proximal opening onto a single light-receiving device. The opening in the front of the electronic device is larger than the opening in the masking. As a result, it is possible to obtain a mold type semiconductor laser capable of constantly detect accurate laser chip output and capable of forming an accurate optical output control circuit.