Optium, a US based maker of optical subsytems, had this to say regarding 40 Gbps components in their latest earnings report:

Optium added to its product line with the acquisition of Kailight Photonics Inc of Nes Ziona, Israel (announced at the end of March and completed in May), whose 40Gb/s product line addresses both client-side and line-side applications. “As we connect our strong base of customers to Kailight’s leading technology, we are seeing a very positive response,” claims Gertel. “Customers have been particularly interested in our ability to offer module solutions that can be integrated into line-cards cost effectively,” he adds. “We expect to make our first 40Gb/s product shipments in our current fiscal fourth quarter.”