Optical fiber transmits signals through light guide, non-conductive, and not afraid of lightning strikes, so there is no need to use grounding protection. According to the transmission mode of light in the optical fiber, we divide it into multi-mode optical fiber and single-mode optical fiber.
The semiconductor laser amplifier is small in size, wide in frequency band, and high in gain, but the biggest weakness is that the coupling loss with the optical fiber is too large, and it is easily affected by the ambient temperature, so its stability is poor. Semiconductor optical amplifiers are easy to integrate and are suitable for use in combination with optical integration and optoelectronic integrated circuits.
The SLED light source is an ultra-wideband light source designed for special applications such as sensing, fiber optic gyroscopes, and laboratories.
The fiber optic current sensor is a smart grid device whose principle uses the Faraday effect of magneto-optical crystals.
Structural design optimization: The three basic principles of semiconductor lasers are: electrical injection and confinement, electrical-optical conversion, optical confinement and output, which correspond to electrical injection design, quantum well design, and optical field design of the waveguide structure, respectively. Optimizing the structure of quantum wells, quantum wires, quantum dots, and photonic crystals has promoted the continuous improvement of laser technology, making the output power and electro-optical conversion efficiency of lasers higher and higher, beam quality getting better and better, and higher reliability .
The principle of the photodetector is that the conductivity of the irradiated material changes due to radiation. Photodetectors are widely used in various fields of military and national economy. In the visible or near-infrared band, it is mainly used for ray measurement and detection, industrial automatic control, photometric measurement, etc.; in the infrared band, it is mainly used for missile guidance, infrared thermal imaging, and infrared remote sensing. Another application of the photoconductor is to use it as the target surface of the camera tube.
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