Analysis
Laser Transmitter Modules for 10Gb/s and 8Gb/s SFP+
With its new transmitter optical sub assembly (TOSA) series Mitsubishi Electric has developed four 1.3µm band laser modules for optical transmission at speeds of 10Gb/s and, respectively, 8Gb/s.
Each individual module fits into an enhanced 8.5 and 10 Gigabit small form factor pluggable module (SFP+) measuring just 13.3mm x 13.4mm x 56.5mm. Compared to XFP (10 Gigabit small factor pluggable module) the SFP+ compliant transceivers are 60 percent smaller in width and 70 percent smaller in length. The new devices use a Flexible Printed Circuit (FPC) for the electrical interface between the modules and transceivers.
As tBy using highly-efficient distributed feedback laser diodes (DFB-LDs) for medium and long-distance transmissions and fabry-perot laser diodes (FP-LD) for short-distance communications, the new product can operate at currents of just 70mA, which is 20 percent lower than the current consumed by previous modules. This leads to a decrease in power consumption as well as to an increase in operating temperature to 90 degrees C, which is 10 °C higher than before.
With these features the new TOSA series (FU-456RDF and FU-466RLD for 10G and FU-442RDF and FU-443RLD for 8.5G transmission) from Mitsubishi Electric enables the design of small transceiver systems. These are operating with low power consumption over a wider temperature range which is essential features to achieve high-density installations in fiber based applications like metro area networks and high speed storage area networks.