High-Speed Fiber-Coupled InGaAs Bias Detectors 20GHz

SKU: HSDT

The HSDT series High-Speed Fiber-Coupled Detectors feature high fidelity analog response at high bandwidth up to 20GHz. Biased detectors are the preferred method to measure a signal’s fast transit characters, avoiding distortions caused by amplification circuitry. The HSDT fiber-coupled detectors produce a linear response to the incident light. Being reverse-biased with an internal battery, the HSDT consists of a high-speed InGaAs PIN photodiode with an internal bias. It is operated in a photoconductive mode in which an input light generates a current flow. The high bandwidth signal is output through an RF SMA connector for monitoring with an oscilloscope or other measurement electronics. Since the signal is not amplified, a parallel resistor to 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 is, 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 measurement <300MHz, no resistor is needed. For measurement >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.