Fujitsu’s 40 Gbps interfaces for its FLASHWAVE 7500 ROADM

Fujitsu Network Communications announced the availability of second-generation 40 Gbps interfaces for its FLASHWAVE 7500 Reconfigurable Optical Add/Drop Multiplexer (ROADM). Utilizing an Adaptive Differential Phase Shift Keying (ADPSK) modulation scheme and Fujitsu patented Variable Dispersion Compensation (VDC), the second generation units enable network growth up to 1.6 Tbps of capacity to meet ongoing demands for increased speed and bandwidth.

Three new 40 Gbps units are available for the FLASHWAVE 7500 ROADM, including the 40 Gbps Transponder, 4:1 Muxponder, and 40 Gbps Regenerator. Primarily intended for 40 Gbps core router interconnection services, the 40 Gbps Transponder provides a full-band tunable network interface and an OC-768 client interface. Supporting four 10 Gbps client interfaces, the 4:1 Muxponder provides an efficient method for aggregating 10 Gbps traffic and quadrupling the capacity of existing 10 Gbps-based networks. The 40 Gbps Regenerator provides electrical signal regeneration for long spans, eliminating the cost and complexity involved with the use of back-to-back transponders.

All units support ITU G.709 Optical Transport Network (OTN) standards for mapping client signals, optical layer performance monitoring, alarm indication signals, and Enhanced Forward Error Correction (EFEC) for improved optical performance. A Fujitsu-patented VDC device is incorporated into each module, permitting 40 Gbps transmission over wavelengths originally designed to have a maximum speed of 10 Gbps. With this flexibility, network planners who face capacity shortages on existing networks can now effectively increase wavelength capacity fourfold and offer new 40 Gbps services without requiring changes to their existing 10 Gbps wavelengths and networks.

The FLASHWAVE 7500 ROADM is a complete optical hubbing and transport solution widely deployed in traditional telecom carrier and cable operator networks to support core network consolidation, metro/regional capacity relief, and triple-play service delivery. It is available in ANSI and ETSI configurations. Network topology support spans from simple two-degree (2D) ROADM ring networks to advanced 8-degree optical hubbing/mesh applications. The system supports network sizes of up to 1000 km, up to 24 add/drop nodes per network, and a capacity of up to 1.6 Tbps.