Optical transport equipment vendor Coriant says it has partnered with Polish alternative service provider Netia to trial 400-Gbps DWDM technology. This is Coriant’s second reported trial of 400G technology implemented on its hiT 7300 DWDM platform (see “Telekom Austria's A1, Coriant run 400 Gbps via space-division multiplexing” for the first).
Unlike the first trial, this 400G optical transmission consisted of a 150-GHz superchannel with four subcarriers on the ITU-T 50-GHz grid. The transmission leveraged Coriant’s Flexigrid ROADM technology. The trial included carrying the 400G superchannels alongside 10-Gbps NRZ wavelengths.
The trial system consisted of two Flexigrid ROADM nodes (without dispersion compensators) connected in a point-to-point architecture. Each node contained a standard amplifier for outbound signals and preamplifier for inbound signals.
Coriant says the test revealed no significant differences in optical performance when varying superchannel width from 400 GHz to 150 GHz. The adjacent 10G channels and 400G superchannel performed without mutual interference as well, the company reports.
The partners performed bit error rate measurements with EXFO test and measurement equipment delivered by Coriant's Polish partner, Rate Art.
Coriant has supplied DWDM equipment to Netia since the systems vendor was the optical transport business of Nokia Siemens Networks (see, for example, “Netia jumps to 100G in Poland with Nokia Siemens Networks”). Netia has deployed “almost all” of Coriant's DWDM portfolio, according to the systems house.
"At Netia we have been working very closely with our strategic partner Coriant to continue to stay at the forefront of innovation in optical transport and offer the most advanced, high-capacity services in Poland,” confirmed Marek Owczarski, technology development manager at Netia. “The trials that took place with Coriant highlight our commitment to deliver fast and reliable networks to our customers. Our aim is to deploy integrated telecoms services and media solutions to end users to continue to grow our customer base and value. We believe that 400G technology will enable Netia to offer these services, but also guarantee the quality of service to offer superior customer experience to the end-user."
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