VI Systems GmbH presents its proprietary T25-850 optical transmitter subassembly (TOSA) and R25-850 optical receiver subassembly (ROSA) for data rates up to 28 Gbit/s. The receiver includes a PIN photodetector within a spectral range of 700-890 nm and a high-frequency transimpedance amplifier (TIA) in an extremely compact TO-type micro-encapsulation. The transmitter combines VI Systems' ultra-high-speed 850nm VCSEL and IC controller. The TO-type encapsulated transmitter and receiver are coupled to a 50µm multimode fiber. The assembly dimensions are less than 6 mm in diameter, matching those of SFP transceivers. The total length, including a protective plastic section for the fiber cable, is 40 mm. High-frequency test boards are available.

The T25-850 transmitter is specified for operation in a temperature range of 0 to +85°C. The supply voltage is 3.3 V. The TOSA features a low power consumption of only 130 mW. The T25-850 incorporates the latest generation of ultra-high-speed VCSELs from VI Systems, featuring an optimized epitaxial design.

The R25-850 receiver operates at +3.3 V and has a low power consumption of only 110 mW. The ROSA includes a VIS photodetector chip combined with the latest generation of transimpedance amplifier chips from VI Systems to ensure maximum performance at low power consumption.

Target applications are short-range optical transceiver modules used in storage area networks (SANs) and the computer industry. The Internetworking Forum (OIF) defined the first interfaces to operate at data rates of 25 and 28 Gbit/s. Other standards for serial transmission at ultra-high data rate ratios of 26 to 56 Gb/s are currently being developed in Fiber Channel FC32, OIF and Ethernet IEEE 40/100 Gbit/s and EDR Infiniband.

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