NTT Research and Development 2012 Review of Activities

Overview

This is an optical transmitter module for future 100 GbE^*1 transceivers. By monolithically integrating four 25-Gbit/s light sources and their optical multiplexer (MUX) on one chip, we have created a very compact 100 G transmitter chip. Furthermore, we have developed a 100 GbE TOSA^*2 using three-dimensional (3-D) wiring and an FPC^*3 electrical interface, whose volume is 94 % less than that of the conventional one. Ultrafast 100-Gbit/s optical signals can be generated with the module.

Features

• Broadband 25-Gbit/s EA-DFB laser^*4 for monolithic integration
• Compact optical semiconductor chip with four monolithically integrated 25 G light sources and their MUXes
• Specially designed TOSA, using 3-D wiring for high-speed modulation and low electrical crosstalk and FPC electrical interface
• 94 % volume reduction in comparison with a conventional transmitter unit
• Error-free operation in single-mode fiber transmission of up to 40 km

Application scenarios

• Faster, and higher capacity of client-side networks
• Middle and long- distance LANs, such as used by inter-data center networks
• “Green” optical devices (low power consumption, compact)
• Next step: Large-scale integration and capacity increase

• *1 100 GbE: 100 Gigabit Ethernet
• *2 TOSA: Transmitter Optical SubAssembly
• *3 FPC: Flexible Printed Circuit
• *4 EA-DFB laser: ElectroAbsorption modulator integrated with DFB laser