According to different optical signal transmission methods, digital triple band repeaters can be divided into single-mode digital triple band repeaters and multi-mode digital triple band repeaters.

According to different optical signal interface methods, digital triple band repeaters can be divided into pigtail digital triple band repeaters and connector end digital triple band repeaters.

According to the working principle of digital triple band repeaters, it can be divided into displacement digital triple band repeaters, Direct coating type digital triple band repeaters and attenuator type digital triple band repeaters, etc.

In actual use, the attenuator is selected according to different attenuation methods. Therefore, digital triple band repeaters can be divided into fixed digital triple band repeaters and variable digital triple band repeaters. Fixed digital triple band repeaters can be divided into pigtail, converter and converter digital triple band repeaters, Variable digital triple band repeaters are divided into small variable digital triple band repeaters, Step variable digital triple band repeaters and successive variable digital triple band repeaters.

With the development of optical communication technology, the demand for digital triple band repeaters is: Low insertion loss, high return loss, good resolution linearity and repetition type, large adjustable attenuation scale, high attenuation accuracy, small size of the equipment, good environmental function, among which, the resolution linearity depends on the characteristics of the attenuation element equipment and the reading development method and mechanical adjustment structure used, and the medium recovery also depends on the reading development method and mechanical adjustment structure used. digital triple band repeaters The important targets are attenuation, insertion loss, attenuation accuracy and return loss.

1. Attenuation and insertion loss: attenuation and insertion loss are important technical objectives of digital triple band repeaters. The attenuation target of fixed digital triple band repeaters is actually its insertion loss, while the variable digital triple band repeaters have a separate insertion loss target requirement in addition to the attenuation. High quality variable digital triple band repeaters have insertion losses below 1.0db.

2. Attenuation accuracy: The attenuation accuracy of digital triple band repeaters is one of the important objectives of digital triple band repeaters. The attenuation accuracy of general mechanical digital triple band repeaters is plus or minus 0.1 times of its attenuation.

3. Return loss: The return loss of digital triple band repeaters is the ratio of the light energy incident into digital triple band repeaters and the light energy emitted along the incident optical path in digital triple band repeaters. High functional digital triple band repeaters have a return loss of more than 40db.

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