6. Working principle of polarization maintaining optical fiber jumper
Polarization-maintaining jumpers achieve coupling alignment of polarization modes through precise connector keying. Compared with traditional optical fiber jumpers, polarization maintaining jumpers have the advantages of transmitting polarized light signals through polarization maintaining fibers, ensuring that the direction of linear polarization remains unchanged, improving the coherent signal-to-noise ratio, and realizing high-precision measurement of physical quantities.
The polarization-maintaining connector is an important component for the coupling of two polarization-maintaining fibers. It ensures that the polarization mode of the two polarization-maintaining fibers during coupling maintains the original polarization state of the polarized light and maintains a high extinction ratio for transmission. This requires accurate docking of the slow axis or fast axis of the two optical fibers to minimize the θ angle error. Aligning the polarized light polarization direction with one of the axes, the polarization component divided into the other axis will be small, thereby maintaining the polarization state of the transmitted light. The polarization-maintaining angle and extinction ratio reflect the quality of maintaining the polarization state.
7. how to align the "cat's eye".
The stress rod is parallel to the fiber core, and the applied stress produces birefringence in the fiber core, which is conducive to the polarization propagation of light in only one direction, so as to maintain the polarization maintaining work. Panda stress rods are cylindrical, while bowtie stress rods are trapezoidal prisms.
Generally speaking, the quality of the polarization maintaining fiber depends on the incident state of the polarized light, and the polarization state of the polarized light is required to be aligned with the fast and slow axes of the polarization maintaining fiber. To ensure that the two optical fibers transmit with a high extinction ratio, it must be ensured that when the polarization-maintaining optical fiber is terminated through the optical fiber connector, the stress rod should be aligned with the key of the connector. Whether the keys are aligned directly determines the link transmission function of the polarization maintaining connector, and this indicator is very critical.
8. Where is it used?
Polarization-maintaining fibers are generally used in applications that are sensitive to polarization states, such as interferometers or lasers. It is also often used in sensors such as fiber optic gyroscopes, fiber optic hydrophones, and fiber optic communication systems such as DWDM and EDFA.
