Even if the ordinary optical fiber and then made to be symmetrical, in practical applications will be subjected to mechanical stress becomes asymmetric birefringence, therefore, the polarization state of the optical fiber transmission in an ordinary time will be no changes regularly. The main factors are the wavelength, bending, and temperature. Polarization maintaining fiber
change the polarization state can solve the problem, but it does not eliminate the fiber birefringence phenomenon, but is by design on the fiber geometry, resulting in more intense birefringence effect, to eliminate stress on the polarization state of the incident light impact.
Polarization maintaining fiber：polarization maintaining optical fiber transmission line polarized light, widely used in various fields of aerospace, aviation, marine, industrial manufacturing technology and communications of the national economy. In optical coherent detection based interferometric fiber optic sensor using polarization-maintaining fiber can guarantee linear polarization direction of the change, to improve coherence SNR in order to achieve high-precision measurement of physical quantities. PMF as a specialty fiber, mainly used in fiber-optic gyroscope, fiber optic hydrophone and other sensors and DWDM, EDFA and other fiber-optic communication systems. Since the fiber optic gyroscope and fiber optic hydrophone, etc. can be used for military inertial navigation and sonar, are high-tech products, and polarization maintaining fiber is its core components, which have been included in the PMF embargo on my list of Western countries. Now the domestic part of the optical fiber manufacturing company has been able to produce.
Polarization maintaining fiber change the polarization state can solve the problem, but it does not eliminate the fiber birefringence phenomenon, but is by design on the fiber geometry, resulting in more intense birefringence effect, to eliminate stress on the polarization state of the incident light impact. So polarization maintaining fiber is generally applied to the polarization state sensitive applications, such as interferometers, or laser, or used in connection between the light source and an external modulator and so on.
Low attenuation polarization maintaining fiber: single-mode fiber with the continuous improvement of technology, loss, material dispersion and waveguide dispersion is no longer a major factor in the impact of optical fiber communication, single-mode fiber polarization mode dispersion (PMD) is becoming limiting optical fiber communication quality the most serious bottleneck in the 10 Gbit / s and above, high-speed optical fiber communication systems particularly prominent. In order to solve the degradation of the transmission performance of the system brings PMD problems are generally taken to compensate for PMD solution, but PMD of temperature and other environmental conditions, and the disturbance source wavelength light are very sensitive to random changes will occur with time, these PMD compensation optical fiber communication systems gave difficult. If the low attenuation polarization maintaining fiber can successfully developed, will provide new solutions to solve high-speed transmission systems PMD issues;
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