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Optical Solutions

NoBI® OBI-Free Active Splitter (NoBI)

Lindsay Broadband totally eliminates OBI with its outdoor temperature-rated NoBI active optical splitter. It does so even in networks with multiple upstream lasers, by combining them on a single upstream wavelength.

Optical beat interference (OBI) occurs when simultaneous optical upstream transmissions from multiple CPE devices (RFoG mini nodes) interfere with each other – a condition that becomes more likely as subscriber densities increase. OBI is a huge issue that RFoG fiber to the home (FTTH) networks face.

The NoBI OBI-free active splitter eliminates OBI without compromising network performance, and allows operators to migrate to higher capacity DOCSIS® 3.0 and 3.1 technologies. The active splitter easily allows operators to achieve twice the reach of traditional passive splitters in an RFoG network. The 19”, 1RU NoBI active splitter can be installed in either a headend/hub or a distribution cabinet. The device is also available in an outdoor wall/pole/strand enclosure, which can be used in multi-dwelling (MDU) applications. The device is rated to withstand temperatures from -40°C to +60°C (-40°F to +140°F).

Lindsay’s NoBI active splitter includes an optional erbium-doped fiber amplifier (EDFA) for a downstream 1550 nm optical signal that compensates for splitting losses. It also has an integrated 1550/1610 nm WDM. The upstream active combiner is a DOCSIS 3.1 capable, 204 MHz upstream bandwidth, wideband (1240 nm to 1620 nm; except 1540-1560 nm) multi diode receiver. The multiple upstream signals are received by this multi diode receiver, conditioned, and sent to the headend using a 1610 nm high performance CW 6 dBm distributed feedback (DFB) laser.

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