High-Speed Fiber-Coupled InGaAs Bias Detectors

SKU: HSDT

The HSDT series High-Speed Fiber-Coupled Detectors feature high fidelity response at high bandwidth >GHz. Biased detectors are the preferred method for measuring a signal’s fast transit characteristics, avoiding distortions caused by amplification circuitry. The HSDT fiber-coupled detectors produce a linear response to the incident light. When reverse-biased with an internal battery, they are operated in a photoconductive mode in which an input light generates a current flow. The high bandwidth signal is output through an SMA connector for monitoring with an oscilloscope or other measurement electronics. Since the signal isn’t amplified, placing a parallel resistor at the output that converts the detector current to an output voltage can maximize the response frequency. The smaller the parallel resistance at the output end, the higher the peak power of the incident optical signal is required. The HSDT has a 100k parallel resistance built-in to reduce the background noise. For measurements <300MHz, no resistor is needed. For measurements >300MHz, a 50‑ohm resistor is required to terminate parallelly at the oscilloscope input. To measure > 500ns laser pulse, the detector output needs 1k-10k ohm resistance in parallel.
The HSDT detectors are designed for test or measurement applications, including research in the fields of data communications, analog microwaves, and general high-speed photonics. A wall-pluggable DC power supply is an available option.