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Passive 40G/100G transmission overlay launched

Posted: 30 Sep 2011     Print Version  Bookmark and Share

Keywords:transmission  rf transceiver  overlay  data centre network 

Demand for digital bandwidth is driving fibre deployment beyond the proximity of the central office and deep into regional hubs, local nodes, wireless backhaul corridors, street-level pedestals and even subterranean distribution pods. Furthermore, enterprise, campus and dispersed data centre network expansions increasingly extend fibre links directly to the "end-user".

Many "Middle Mile" networks already strain under current traffic loads to say nothing of the increasing data quantity and data rate trends. Cube Optics recognised the imminent need to upgrade bandwidths and to implement 40Gbps and 100Gbps links while participating in setting the IEEE 802.3ba standard for pluggable 40G and 100G transceivers.

The company supplies advanced multi-wavelength MUX modules to major CFP transceiver vendors. Implementing the technical conventions made the urgency for solutions exploiting existing fibre strands with higher transmission rates evident. For example, installing the 40G Base-LR4 and 100G Base-LR4 transceivers over existing multiple 10Gbps DWDM metro links defeats the intended bandwidth augmentation leading instead to a bandwidth decrease. The typical metro application obliges reliable and uninterrupted use of the legacy DWDM topology and supplementing with 40G or 100G transport channels. The concept of overlaying existing DWDM networks including up to 40 DWDM channels with an additional 40G or 100G service is convenient. Such an overlay approach relies on a simple, passive and inherently 100 per cent interoperable approach boasting an enviable track record of reliable operation across all contemporary DWDM and 40G Base-LR4/ER4 and 100G Base-LR4/ER4 transceivers and optical transport interfaces. Introducing discretely independent channels via different (or similar) transmission protocols and data rates relieves fibre exhaust in practically all legacy LRF infrastructures quickly and cost effectively.

The Network Cube optical layer multiplexing family of solutions boast a low cost and straightforward means of adding needed bandwidth while preserving continuous and unencumbered operation of revenue generating legacy services. A recent carrier upgraded an existing 40G legacy network with 40 10G DWDM channels to attain a total capacity of 440Gbps over a single fibre pair deploying only one 1HU/19inch chassis per site.

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