PLC optical splitter technical indicators

Insertion loss.

The insertion loss of the optical splitter refers to the dB number of each output relative to the input optical loss, and its mathematical expression is: Ai=-10lg Pouti/Pin, where Ai refers to the insertion loss of the i-th output port; Pouti is The optical power of the ith output port; Pin is the optical power value of the input port. additional loss.

The additional loss is defined as the DB number of the sum of the optical power of all output ports relative to the input optical power loss. It is worth mentioning that for optical fiber couplers, the additional loss is an index reflecting the quality of the device manufacturing process, reflecting the inherent loss of the device manufacturing process. The insertion loss only represents the output power status of each output port, not only the inherent loss factor, but also the influence of the splitting ratio. Therefore, the difference in insertion loss between different fiber couplers does not reflect the quality of the device. Spectral ratio.

The splitting ratio is defined as the ratio of the output power of each output port of the optical splitter. In the system application, the splitting ratio is indeed based on the actual optical power required by the optical node of the system to determine the appropriate splitting ratio (except for the average distribution), The splitting ratio of the optical splitter is related to the wavelength of the transmitted light. For example, when an optical splitter transmits light of 1.31 μm, the splitting ratio of the two output ends is 50:50; when transmitting light of 1.5 μm, it becomes 70: 30 (The reason for this is that the optical splitter has a certain bandwidth, that is, the frequency bandwidth of the transmitted optical signal when the splitting ratio is basically unchanged). Therefore, the wavelength must be indicated when ordering the optical splitter.