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As optical communication and optical fiber sensing technology, the rapid development of optical filters have been widely used, and has become an important optical devices, especially on WDM and DWDM systems, the narrow band pass filter which is one of the key components , so a variety of optical fiber communication and even filter has been a hot topic in the field of photonics . And with a birefringent fiber Sagnac loop filter, compared with other filter components , has a simple structure , low cost , low loss, flexibility, polarization independent , stable and easy to adjust the filter characteristic advantages, such as fiber optic sensing solutions tune , tunable multi-wavelength fiber lasers and fiber-optic communication filters and other areas with great prospect , it has become a focus of attention in recent years . Based on the basic theory of the Jones matrix , theoretically derived from a single-stage high-birefringence fiber Sagnac loop transmission and reflection function of a variety of forms of expression , and through numerical simulation and experimental studies were basic high birefringence Sagnac loop of different components parameters , such as the coupler coupling coefficient , the deflection angle of the polarization controller , the length of high birefringence fiber beat length of its filter characteristics , in order to verify the correctness of the theory . The author also this basis, using numerical analysis method further high birefringence Solc-Sagnac and Lyot-Sagnac The filtering characteristics are analyzed in detail , proposed several good performance of the filter design.
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