D400FC In Stock

The D400FC by ThorLabs is an InGaAs fiber optic photo detector that is capable of measuring both pulsed and CW light sources. The D400FC is designed to be completely self-contained and serves as an input module for converting electronic test equipment into an optical system. To optimize the use of the D400FC with free-space beams, it is recommended to utilize a fiber coupling package that is mounted into a kinematic mount, which allows for easy coupling into the photo detector.

The D400FC is a high-speed and ready-to-use photo detector that is made up of a detector, an internal 12V bias battery, a FC/PC bulkhead, and a ruggedized insulated housing. With a FC/PC type fiber optic bulkhead connector, the user can couple the D400FC to fiber-based light sources with ease. The D400FC utilizes an SMA style jack, which offers an optimized frequency response. The direct photocurrent out of the photodiode anode is a function of the incident light power and wavelength, which provides the user with precise measurement results.

The D400FC boasts many other impressive features including a reverse biased PIN photo diode and an ON/OFF switch. For the D400FC to reach its highest bandwidth capacity, it is advisable to use a direct connection with a device that has an impedance of 50Ω. In cases where a direct connection isn't feasible, using an SMA-SMA cable with a 50Ω terminating resistor at the end helps to reduce ringing by guaranteeing the coaxial cable retains its intrinsic impedance. If bandwidth is not a crucial factor, the user can increase the amount of voltage for a given input light by increasing the RLOAD up to a maximum of 10kΩ. This added flexibility allows for a wider range of applications and makes the D400FC a valuable asset to any laboratory or testing environment.