The intensity of the optical signal received by the optical receiving device needs to be within a certain range, and the optical power cannot be too strong or too weak, otherwise the life of the device will be shortened or it will not work normally. The optical fiber attenuator is an optical passive device that can be used to reduce the energy of the optical signal and attenuate the input optical power to avoid distortion of the optical receiver due to the super-strong input optical power.
The optical fiber attenuator reduces the optical power through the absorption, reflection, diffusion, scattering, deflection, diffraction, and dispersion of the optical signal. For example, for the absorption of optical signals, set the optical fiber attenuator to a working wavelength range that can absorb light energy. In this range, it does not reflect light and reduces unnecessary echo reflection. In this way, the optical power attenuation effect is achieved. . Generally use air isolation technology, displacement dislocation technology, attenuation fiber technology, absorption glass method and other technologies to make optical attenuators.
The attenuation range of the optical attenuator is 0～65dB. Among them, the attenuation power of the fixed fiber attenuator currently on the market is between 1 and 30 dB. Fixed fiber attenuator is a type of fiber attenuator, which fixes the attenuation power at an attenuation value. Generally used in telecommunications networks, optical fiber test equipment, local area networks (LAN) and cable television (CATV) systems.
There is also a variable optical attenuator. The attenuation level of the variable attenuator can be adjusted, for example, from 0.5 dB to 20 dB, or even 50 dB. Some variable attenuators have very fine resolution, such as 0.1dB or even 0.01dB. Mainly used in: optical distribution frames, optical fiber network systems, high-speed optical fiber transmission systems, cable television (CATV) systems, long-distance trunk dense wavelength division multiplexing (DWDM) systems, optical add/drop multiplexers (OADM).
Among them, the fixed optical attenuator has pigtail type, converter type, and converter type. It can be made into FC, SC, ST, LC, MU and other interface types, and it is convenient to use in daily wiring. Usually a single optical attenuator has two interfaces, male and female, which can be male-female or female-female. The male connector interface is generally used to plug into the receiver of the device or the adapter on the adapter panel, and the female connector interface is used to connect the optical fiber jumper. Yiyuantong can provide various types of fixed female and male optical fiber attenuators with stable performance and reliable quality, which can meet the customized requirements of various connector interface types and working wavelengths of ST, SC, FC, MU, and LC.
Among passive components, fiber optic attenuators are widely used, second only to connectors and couplers. The performance indicators of optical attenuators mainly include attenuation, insertion loss, attenuation accuracy, and return loss. High-performance optical attenuators have low insertion loss, and return loss is usually above 40dB.