Optical networking specialist, Infinera, has demonstrated its DTN system transmitting data over a 4,000km third-party subsea network. By implementing a system with 25GHz channel spacing, compared to the 50GHz spacing of the previously installed equipment, the company claims to have doubled the bandwidth capacity of the subsea system.
At the heart of Infinera's DTN is the company's photonic integrated circuit (PIC) technology - a two-chip solution that combines dozens of optical components, including lasers, modulators, wavelength multiplexers, demultiplexers and photodetectors. The large-scale PICs are designed to work as a pair, handling transmit and receive functions respectively. Infinera says that its original PICs have a 100Gb/s capacity, although it has demonstrated a PIC capable of 1.6 terabits per second in the lab.
"The ability of the Infinera DTN to transmit data undersea for 4,000km, and over a foreign amplifier chain is a path breaking demonstration, which holds out the opportunity of a new, innovative, and cost-effective way to increase capacity on subsea networks," commented Infinera Fellow Dr. Steve Grubb, who will be presenting the demonstration at an Optical Fiber Communication Conference later today.
A traditional submarine optical network consists of chains of subsea optical amplifiers that have been designed for the demands of operation on the ocean floor, and submarine line terminating equipment (SLTE), located in terrestrial landing stations and connected to either end of the amplifier chain. In this demonstration, Infinera DTNs replaced just the SLTE systems and transmitted Dense Wave-Division Multiplexing (DWDM) optical signals across the existing subsea amplifier chain.