Description Stay tuned: light-speed communication is Opnext. The company makes optoelectronic components used to assemble fiber-optic data and voice communications networks. These laser diode modules, transmitter/receiver devices, and transceivers are incorporated by other equipment makers into larger multiplexing and digital cross-connect systems used in data communications and telecommunications. Opnext has a limited number of customers. Alcatel-Lucent, Cisco Systems, and Huawei Technologies together account for about 45% of sales.Other customers include Nokia Siemens Networks and Ciena Corporation. The company gets 40% of its sales in North America.