VI Systems GmbH has introduced the T25-850 transmitter optical subassembly (TOSA) and the R25-850 receiver optical subassembly (ROSA) for data rates of up to 28 Gbps.

The receiver includes a PIN photodetector within a spectral range of 700-890 nm and a transimpedance amplifier (TIA) in a high frequency TO-style micropackage. The transmitter combines VI Systems’ ultra-high-speed 850-nm VCSEL and driver IC.

The transmitter and receiver TO-style package is coupled with a 50-micron multimode fiber. The dimensions of the assemblies are below 6 mm in diameter, which matches SFP transceivers. The overall length, including a plastic boot for strain relief of the optical fiber, is 40 mm. Complementary high-frequency test boards are available.

The T25-850 transmitter is specified to operate over a temperature range from 0 to +85 degree C. The supply voltage is 3.3 V. The TOSA features a power consumption of 130 mW.

The R25-850 receiver supply voltage is +3.3 V. It features a power consumption of 110 mW. The ROSA includes a VIS photodetector chip in combination with the latest generation of transimpedance amplifier chip from VI Systems to ensure maximum performance at low power consumption.

Target applications include short-reach optical transceiver modules used in Storage Area Networks and in the computer industry. The Optical Internetworking Forum (OIF) defined the first interfaces to operate at data rates of 25 and 28 Gbps. Further standards for serial transmission at ultra-high-speed data rates of 26-56 Gbps are currently being developed within Fibre Channel FC32, the OIF, and the Ethernet IEEE 40/100 Gbps and the Infiniband EDR standards bodies.