Loss of photoelectric switch

The loss, dispersion and polarization characteristics of photoelectric switches are important characteristic parameters for studying photoelectric sensing and photoelectric nonlinear effects. Due to loss, the signal energy in the photoelectric switch will continue to attenuate. In order to realize long-distance optical communication and transmission, it is necessary to establish a relay station within the distance and repeatedly enhance the attenuated signal. Dissipation determines the large distance that the optical signal can travel before being amplified by the relay in the optoelectronic device. However, the allowable distance between relay stations not only depends on the optical loss, but is also limited by dispersion.

In terms of optoelectronics, the smaller the pulse dispersion, the larger the information capacity carried by the pulse. For example, if the pulse width is reduced from 1000ns to 1ns, the information capacity of the pulse transmission will increase from 1Mb/s to 1000Mb/s. Therefore, it is very important to carefully analyze the optical dissipation characteristics and dispersion characteristics.

In addition, single-mode optoelectronics cannot maintain the polarization state of transmitted polarized light, so polarization-maintaining fibers are required. Therefore, it is necessary to understand the polarization characteristics of photoelectric sensors, polarization maintaining and polarization control methods, and photoelectric nonlinear effects.