Abstract: Principle of biconically fused fiber polarization beamsplitters (FPBS) has been introduced in this paper, and a new method for fabricating FPBS has been presented. Compared with the conventional methods in which the first polarization modulation waist point (PMWP) arrived after drawing through many power transfer cycles, the power transfer variation versus the drawn length became fast and the stop point in the drawing process was difficult to control, our method has the advantages of easy fabrication. We use a low temperature heater to fuse and taper the fiber coupler, so the coupling region of the coupler is extremely weakly fused such that the fibers are barely touching. Consequently, the number of power transfer cycles before arriving the first PMWP is greatly reduced, and the first PMWP can be determined easily. In our experiment, the first PMWP in the power transfer curve monitored with unpolarized 1312-nm laser light is taken as the stop point in the coupler drawing process, the experimental results show that, an average extinction ratio of $MIN@14.06 dB at the throughput port and $MIN@14.11 dB at the coupled port have been achieved at 1312-nm wavelength. Experimental results show that this method is simple and convenient. !12
展开▼
