Optical transport analyser

The Yokogawa NX4000 is a transport analyser for testing 40 Gbps SONET/SDH and 43/44 Gbps OTN optical communication systems.

The ability to cleanly transmit data at 40G+ line rates requires special optical modulation techniques such as non-return-to-zero, optical duo binary, differential phase-shift key or differential quadrature phase-shift key.

At present, there is no well-defined preference for one particular technique and so the analyser has been designed as a modular unit using field-pluggable cards for each of these techniques.

It consists of a mainframe unit containing slots for the NX4100 SONET/SDH base module, an optical interface module for either NRZ at 39.81 and 43.02 Gbps (NX4120) or DQPSK at 43.02 and 44.57 Gbps (NX4121), and an additional OTN module for 43.02 and 44.57 Gbps (NX4110).

The instrument meets OC0768/STM-256 and OTN OTU3 requirements and can test 44 Gbps ethernet over OTN using four 10 Gbps ethernet channels with over-clocking of the OTU3 interface.

It includes ITU-compliant tunable DWDM line-side optics, and is compliant with the advanced optical modulation format.