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Low excess loss conditions of polarization-maintaining fiber couplers

1988; Optica Publishing Group; Volume: 27; Issue: 23 Linguagem: Inglês

10.1364/ao.27.004807

0003-6935

I. Yokohama, Kazunori Chida, Juichi Noda,

Photonic and Optical Devices

Loss characteristics and field intensity distributions of fused polarization-maintaining fiber couplers are measured. From the results, it is shown that excess loss spectra have a sinusoidal response. Further, the loss peaks of the usual polarization-maintaining and absorption-reducing (PANDA) fiber couplers with indexdepressed stress applying parts are larger than those of PANDA couplers with index-matched stress applying parts. It is also confirmed that low excess loss of <0.1 dB can be obtained for a large waist diameter of the fused region even in conventional PANDA fiber couplers.