(Bloomberg) -- German fiber company Deutsche Glasfaser Holding GmbH is exploring options in case its plan to raise preferred equity fails.  The firm, owned by private equity firm EQT Corp. and Canadian pension fund OMERS, is working with Lazard Inc to consider alternatives, said people familiar with the matter, who spoke on the condition of anonymity. Boston Consulting Group is also carrying out an independent business review, the people said. In the meantime, Deutsche Glasfaser is continuing its process ...