Fiber optic patch cord performance

- Aug 20, 2018-

The performance of fiber optic connectors is first of all optical performance, in addition to the interchangeability, repeatability, tensile strength, temperature and number of insertions and removals of fiber optic connectors. Since fiber optic connectors are also a lossy product, they are also required to be inexpensive. To a certain extent, the performance of the fiber optic connector affects the reliability and performance of the entire optical transmission system. (1) Optical performance: The optical performance requirements of the optical fiber connector are mainly the two basic parameters of insertion loss and return loss. Insertion Loss is the loss of the effective optical power of the link caused by the introduction of the connector. There are two reasons for the insertion loss: 1. The inherent loss due to fiber tolerance. Mainly due to fiber manufacturing tolerances, ie core size, numerical aperture, core/cladding concentricity and refractive index mismatch. 2. The inherent loss caused by the connector assembly. This is due to the assembly tolerances of the connector, namely the end face clearance, the axial inclination, the lateral offset and the Fresnel reflection and the accuracy of the end face machining. The smaller the insertion loss, the better. Generally, the requirement should be no more than 0.5dB. In the usual cable TV engineering calculation, the value of the insertion loss is recorded as 0.5 dB. Return Loss (Reflection Loss) refers to the ability of the connector to suppress the reflection of the link optical power. It is a measure of the input power component reflected back from the connector and returned along the input channel. The typical value is not less than 25dB. For fiber-optic communication systems, as the transmission rate of the system continues to increase, the effect of reflection on the system is also increasing. The large reflection from the connector will affect the stability of the high-rate laser (switching rate is Gbit/s). And cause an increase in distributed noise and laser jitter. Especially in CATV systems, the requirements for return loss performance are higher. Therefore, the return loss only meets the requirements of the typical value, which cannot meet the actual requirements, and further needs to improve the return loss. Studies have shown that return loss can be made greater by special polishing or grinding of the ends of the butt ends of the connectors. In practical applications, the surface of the pin has been specially polished to provide a return loss of typically no less than 45 dB. (2) Interchangeable and repetitive optical fiber connectors are general-purpose passive devices. For the same type of optical fiber connectors, they can be used in any combination and can be used repeatedly. Therefore, the additional losses introduced are generally Should be in the range of less than 0.2dB. (3) Tensile strength of mechanical properties For a good optical fiber connector, the tensile strength is generally required to be not less than 90N. Bending performance At least 5 connector/cable assembly samples should be tested. A force of 15.0 N was applied to the cable at 1 m from the connector. Bend 300 cycles on a circular shaft with a radius of 1.25 cm. After the test is over, the additional loss should not exceed 0.2 dB. Vibration performance The test was carried out under the conditions of a vibration frequency range of (10 to 55) Hz and a stable amplitude of 0.75 mm. The maximum additional loss after the test should not exceed 0.2 dB. (4) Temperature characteristics Generally, the fiber optic connector must be able to operate normally at temperatures between -40oC and +70oC. (5) The fiber optic connectors used for plugging and unplugging times can be plugged and unplugged more than 1000 times, and the additional loss is less than 0.2 dB.

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