Some characteristics of optical attenuator in optical devices

There are several characteristics of an optical attenuator:

(1) attenuation and insertion loss. The attenuation and the insertion loss is an important index of optical attenuator, attenuation index of fixed optical attenuator is actually the insertion loss, and in addition to variable attenuator attenuation, and separate insertion loss index, the insertion loss of the variable attenuator of high quality in the 1.0dB next to the general average of the index is less than the variable attenuator you can use 2.5dB.

(2) attenuation accuracy of optical attenuator. Attenuation accuracy is an important index of optical attenuator, and the attenuation precision of mechanical adjustable optical attenuator is usually 0.1 times of its attenuation, and the size depends on the degree of precision processing of mechanical components.

(3) return loss. One of the most important parameters affecting the system performance is echo loss in the optical device parameters. The impact of return light on optical network systems is well known. The return loss of an optical attenuator refers to the ratio of the light energy incident to the optical attenuator and the reflected light reflected along the incident light path in the attenuator. High performance optical attenuator has more than 45dB return loss. In fact, due process, the actual return loss from the theoretical value of the attenuator is still a certain gap to reduce the line return loss, high return loss must be used in the corresponding attenuator circuit, but also for optical attenuator with a wider range of temperature and frequency range.