Radio altimeters are an important tool for pilots during takeoff and landing. They help to determine the height of the aircraft above the ground and can be crucial in ensuring a safe landing. However, training with radio altimeters can be difficult and costly, especially when using real aircraft. This is where radio altimeter simulators come in….
An optical delay line is a device that can change the optical path, and it has a wide range of applications in optical detection fields such as terahertz time-domain spectroscopy (THz-TDS), optical coherence tomography (OCT), and ultrafast time-resolution spectroscopy. Photoconductive Antenna Detection Principle In a typical terahertz time-domain spectroscopy system based on a photoconductive antenna, the…
There are three common photoelectric conversions (conversion of absorbed photons into charges) mechanisms in photodetectors, which are the photoconductive effect (PCE), photovoltaic effect (PVE), and photo thermoelectric effect (PTE). Fig. 1 (a) Schematic diagram of the structure of 2D photodetector based on SiO2/Si substrate. (b) Schematic diagram of the photoconductive effect: in a dark field and…
This tutorial focuses on reverse-biased p-n junctions that are commonly used for making optical receivers. Metal-semiconductor-metal (MSM) photodetectors are also discussed briefly. 1. P-N PHOTODIODES A reverse-biased p-n junction consists of a region, known as the depletion region, that is essentially devoid of free charge carriers and where a large built-in electric field opposes the flow of…
Photodiodes and phototransistors are often confused with each other because of their similar operation. Both are semiconductor-based components that sense light intensity and convert it into an electrical signal, but they differ. What is the difference between a photodiode and a phototransistor? Before diving into the differences between photodiodes and phototransistors, we need to understand…
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DS-HES series aircraft radio altimeter is a photoelectric delay system that was specially developed for various radio altimeter simulators’ productions, measurements, and maintains. The systems depend on the technology of the fiber-optic delay line, using fiber-optic lines as the carrier, and the feature of light delay to simulate RF microwave signals’ space transmission distance. In…
The FCAMPD is integrated by a broadband InGaAs photodiode and low noise amplifier. The response wavelength of the InGaAs PIN photodiode is 1000 to 1650nm. The RF gain of a low-noise amplifier is 20~30 dB. FCAMPD can provide the bandwidth of 1GHz, 2.5GHz, or customization（maximum 5GHz. Operates on +5V supply voltages. An optical input port…
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