Dense Wavelength Division Multiplexing (DWDM) is an optical multiplexing technology used to increase the bandwidth over existing fiber networks. It works by combining and transmitting multiple signals simultaneously at different wavelengths on the same fiber. It creates multiple virtual fibers, thus multiplying the capacity of the physical medium. It is also an ultra-long-haul transport with high capacity bandwidth possible. Modular and scalable architecture that ensures both low initial cost and flexibility into the future.