100Gbps Transmission System Solutions

100G DWDM Systems – History of Mitsubishi’s DWDM Systems

History of Mitsubishi’s DWDM Systems

Mitsubishi Electric Corp. has been developing products using DWDM for high capacity Metro and Core Networks, with particular emphasis on L-band DWDM systems in addition to C-band. L-band offers good performance over the DSF (Dispersion Shifted-Fiber) that is especially common in Japanese networks, so Mitsubishi’s DWDM system can be applied to any optical network in the world without considering the type of fiber. Furthermore, we have advanced forward error correction (FEC) technology, optical semiconductor (device) products with a large share of the world market, extensive experience of long-distance transmission gained in the course of numerous submarine cable projects spanning 20 years, and user-friendly NMS (Network Management System) supervisory and control technology.

In 1997, taking advantage of optical semiconductor technology manufactured in our own factory, we placed a 622 Mbps-based DWDM system in the market.

In 2000, we marketed in major Japanese cities a 32ch x 2.5 Gbps DWDM system that could be used without 3R regeneration. In addition, we developed and marketed a bidirectional DWDM system.

In 2002, we marketed a 40ch x 10 Gbps L-band DWDM system corresponding to a ring network span of up to 4,000 km*1 and it was adopted as the backbone network of a major mobile carrier. In this system, an OUPSR (Optical-Unidirectional Path Switching Ring) system was adopted as the protection function. This function reduced the shut-down time when switching from a working path to a protection path to 50 ms or less.

In 2007, we marketed an 80ch x 10 Gbps L-band ROADM (Re-configurable Optical Add/Drop Multiplexer) system with a function to re-configure a ring network path. It was upgraded to 40 Gbps in 2011, and to 100 Gbps in 2013.

In recent years, with the explosive growth of communication devices like smart-phones and tablets, the demand for communication capacity has continued to increase steadily all over the world. Diversity is also required in terrestrial DWDM/OADM systems, and large capacity, high reliability and further sophisticated functions have become necessary. Based on new technologies and its accumulated know-how, Mitsubishi Electric has responded to the needs of customers. Mitsubishi Electric will continue to work on developing speeds up to 400Gbps and 1Tbps and improving the efficiency of the network.

*1: SMF, estimated at 0.3 dB/km.