Samant will discuss the benefits of DWDM return technology, which, implemented on a gradual basis, allows operators to upgrade existing return path performance incrementally on an as-needed basis. DWDM, which allows several wavelengths to run over a single fiber, can be used to aggregate return paths, thus increasing the capacity of each node and hub site. Combining DWDM with a digitized return path further helps optimize bandwidth. One digital transmitter can carry twice the bandwidth of an analog transmitter, says Samant. Or, put another way, digital transmitters can serve twice the customers as their analog counterparts.
Digital transmitters can also replace block converters and help to improve noise performance.
Adding to its flexibility, DWDM gear can be deployed in the node or at the hub, depending on each network configuration, according to Samant. In addition, DWDM gear at hub sites can accommodate more capacity as return path demand increases, without adding more fiber between the hub and headend. ADC Telecommunications Supplies several types of return path amplifiers and receivers, including dual and quad receivers, in addition to optical distribution and power domain nodes. Applied Instruments Sells test and measurement equipment, including a return alignment system. Arcom Offers window filters, MRSA step attenuator drop noise devices and high-pass filters.