What are the technical requirements in terms of optical properties of fiber optic connectors?

I. Technical requirements for optical performance of fiber optic connectors? Optical properties of fiber optic connectors mainly include insertion loss and return loss. Insertion loss and return loss is not independent, the theory is that high insertion loss generally corresponds to low return loss, and on the contrary, low insertion loss generally corresponds to high return loss. But because the insertion loss optical power is much larger than the return loss optical power, so the above law is not true. In fact, the size of the return loss depends mainly on whether the reflected light can be bypassed as far as possible, which is very much related to the structure of the end of the pin end face. Fiber optic connectors insertion loss is caused by the fiber optic intrinsic loss and termination loss, while the fiber optic intrinsic loss mainly consists of fiber optic absorption loss and Rayleigh scattering loss, the current fiber optic manufacturing technology can make the fiber optic intrinsic loss in the vicinity of the 1550nm down to 0.2dB/km, and the fiber optic jumper is usually about 10m in length, so the fiber optic jumper intrinsic loss can be almost negligible. Therefore, the insertion loss of the fiber optic active connector mainly depends on the termination loss of the fiber optic patch cord. Termination loss refers to the loss caused by two fiber optic patch cords connected through the adapter. There are many reasons for termination loss, including fiber core size mismatch, numerical aperture mismatch, refractive index distribution mismatch, end face gap, axial inclination, lateral offset or concentricity, Fresnel (Fresnel) reflection and so on.

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