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Cable Technology Feature Article

June 10, 2009

Fujitsu Intros New 40 Gbps Interfaces for its FLASHWAVE 7500 ROADM

By Anshu Shrivastava, TMCnet Contributor

Fujitsu (News - Alert) Network Communications, a supplier of optical and wireless networking solutions, has announced the general availability of second-generation 40 Gbps interfaces for its FLASHWAVE 7500 Reconfigurable Optical Add/Drop Multiplexer (ROADM (News - Alert)).
The second generation units use an Adaptive Differential Phase Shift Keying (ADPSK) modulation scheme and Fujitsu patented Variable Dispersion Compensation (VDC).
This, company officials said allow the units to enable network growth up to 1.6 Tbps of capacity to help customers meet ongoing demands for increased speed and bandwidth.
Bill Erickson, senior vice president of planning and development at Fujitsu Network Communications (News - Alert), said that with the introduction of the second generation 40 Gbps units the company is improving optical performance. In addition, the company is also reducing the physical size of the 40 Gbps units by 50 percent as compared to the first generation 40 Gbps cards announced in June 2007.
Three new 40 Gbps units are currently available for the FLASHWAVE 7500 ROADM, including the 40 Gbps Transponder, 4:1 Muxponder, and 40 Gbps Regenerator.
The 40 Gbps Transponder has been primarily intended for 40 Gbps core router interconnection services and now provides a full-band tunable network interface and an OC-768 client interface.
Officials said that the 4:1 Muxponder supports four 10 Gbps client interfaces, and provides an efficient method for aggregating 10 Gbps traffic and quadrupling the capacity of existing 10 Gbps-based networks.
Also, the 40 Gbps Regenerator provides electrical signal regeneration for long spans, which eliminates the cost and complexity involved with the use of back-to-back transponders, said officials.
Officials said that all units support ITU G.709 Optical Transport Network (OTN) standards for mapping client signals, optical layer performance monitoring, alarm indication signals, and also Enhanced Forward Error Correction (EFEC) for improved optical performance.
A Fujitsu-patented VDC device is incorporated into each module, which permits 40 Gbps transmission over wavelengths originally designed to have a maximum speed of 10 Gbps. Officials said that this flexibility allows network planners—who face capacity shortages on existing networks—to increase wavelength capacity fourfold and offer new 40 Gbps services without changing their existing 10 Gbps wavelengths and networks.
A complete optical hubbing and transport solution, FLASHWAVE 7500 ROADM is deployed in traditional telecom carrier and cable operator networks to support core network consolidation, metro/regional capacity relief, and triple-play service delivery.
Officials said that the FLASHWAVE 7500 platform is available in ANSI and ETSI (News - Alert) configurations. Network topology support spans from simple two-degree (2D) ROADM ring networks to advanced 8-degree optical hubbing/mesh applications.

Anshu Shrivastava is a contributing editor for TMCnet. To read more of Anshu’s articles, please visit her columnist page.

Edited by Stefania Viscusi