Hybrid Series 1.25 GBPS Photodiode Amplifiers

OSI Optoelectronics’ FCI-H125G-10 are low-noise, high-bandwidth photodetectors plus transimpedance amplifiers designed for short wavelength (850 nm) high-speed fiber optic data communications. This hybrid series incorporates a 250 µm diameter large sensing area, high sensitivity silicon photodetector. They also include a high gain transimpedance amplifier producing a differential output voltage for latching to post amplifiers used in electro-optical receivers and transceivers for Gigabit Ethernet and Fibre Channel applications up to 1.25 Gbps over multi-mode fiber. The photodetector converts the light into an electrical signal while the output voltage increases with light in/out. This is achieved by a single 3.3 V to 5 V positive power supply.

These devices are available in 4-pin TO-46 metal packages with either a double-sided AR coated window cap or an integrated lens cap. The 250 µm diameter sensing area eases fiber alignment for connectorization or receptacle attachment. The proximity of the transimpedance amplifier to the photodetector lowers the capacitance associated with long traces, allowing higher bandwidth and sensitivity.