All-Fiber Circular Polarization Filter Realized by Using Helical Long-Period Fiber Gratings

作者：Zhu, Chengliang; Yamakawa, Takuya; Zhao, Hua; Li, Hongpu^*

来源：IEEE Photonics Technology Letters, 2018, 30(22): 1905-1908.

DOI：10.1109/LPT.2018.2871844

• Helical long-period fiber grating
• circular polarization converter
• single mode fiber

A simple method to produce an all-fiber circular polarization filter is proposed and experimentally demonstrated, which is realized based on the utilization of two consecutively cascaded single-helix helical long-period fiber gratings but with opposite helicities (SHLPGs-OHs). The proposed SHLPGs-OH can be used as a circular polarizer as well as an equivalent half wave-plate, which enables us to turn a left-circular (right-circular) polarization light to a right-circular (left-circular) polarization one. As a concept-proof example, a polarization-converter with an extinction ratio (between the left- and the right-circular polarization light) of similar to 20 dB, insertion loss of similar to 10 dB, and a bandwidth of similar to 4 nm has been successfully demonstrated.

• 出版日期2018-11-15
• 单位南京师范大学