The Maryland-based networking giant, which has a presence in Ottawa, posted a GAAP loss of US$29.8 million, a slight improvement from $31.5 million in the same quarter last year.
Revenues increased to $471.4 million, up almost nine per cent from $435.3 million in Q3 2011.
"We are experiencing the effects of ongoing macroeconomic challenges and slower than expected roll-outs of new design wins," stated Ciena CEO Gary Smith.
"However, our approach to the market is working ... (we are) gaining traction with customers globally, and our view of the long-term opportunity is unchanged.”
Thursday's press release comes after some headcount reductions for the company earlier this year.
In February, Ciena disclosed it would trim its headcount in Ottawa by an undisclosed amount as part of a larger set of cost-cutting across the company.
"We're working towards rightsizing the company in terms of improved and sustained profitability," said company spokesperson Nicole Anderson in an OBJ interview at the time.
"This action is really around driving alignment between the product development activity and market demand, and also optimizing the global cost structure."
In 2010, Ciena acquired most of Nortel's optical networking and carrier ethernet assets for US$773.8 million and appointed former Nortel MEN president Philippe Morin as senior vice-president of its global products group.
The company is believed to occupy about 265,000 square feet on Nortel's former campus and is slated to move out of Carling Place no earlier than March 2015 to make way for the federal government.