| 摘要 |
PURPOSE:To enable easy assembly with low loss and less polarization dispersion without adjustment by inserting an element combined with a first double refractive plate, half-wave length plate and Faraday rotor and a second double refractive plate into groove parts at three points. CONSTITUTION:Optical fibers 1, 2 arranged in parallel in proximity to each other are cut at separate three points and are thereby formed with the groove parts. The first double refractive plate 5, the half-wave length plate 6 and the Faraday rotor 7 of a rotating angle 45 deg. in tight contact therewith and the second double refractive plate 8 are inserted into these groove parts. The double refractive plates 5, 8 are so constituted that the ordinary light of the incident light thereon advances rectilinearly and that the extraordinary light is axially misaligned and is emitted to another optical fiber. The half-wave length plate and the Faraday rotor 7 are adhered and integrated and are so constituted that the plane of polarization rotates 90 deg. with respect to the forward direction light transmitted as the ordinary light or extraordinary light through the double refractive plate 5 and that the plane of polarization does not rotate with respect to the backward direction light transmitted as the ordinary light or extraordinary light through the double refractive plate 8. |
