OCEANPORT, NJ, Sept 26 -- Tellium Inc., A start-up manufacturer of high-capacity optical switches, has filed an initial public offering with the Securities and Exchange Commission. The price or amount of shares to be offered was not disclosed. The company hopes to raise $250 million, which it will use for general corporate purposes, including working capital and potential acquisitions, it said.Originally a research and development company, Tellium only began developing optical networking technology during the second quarter of last year. Thc company now makes a set of fiber optic switches that can send Internet traffic at high speeds over long distances. Competitors to Tellium include Ciena, Sycamore Networks and Cisco Systems, among others.