| 摘要 |
A method of forming a linear polarization-maintaining optical fiber for use in an amplifier, the method comprising the steps of:providing a rare-earth-doped non-polarization-maintaining optical fiber having one or more cladding layers and having a random birefringence;providing a mandrel having a selected diameter;coiling said non-polarization-maintaining optical fiber under a selected tension around said mandrel to induce a linear birefringence greater than said random birefringence in said non-polarization-maintaining optical fiber thereby forming a polarization-maintaining optical fiber;wherein said mandrel diameter is chosen to avoid significant bend loss;wherein said rare-earth dopant is selected from the group consisting Nd<3+>, Yb<3+>, Pr<3+>, Ho<3+>, Er<3+>, Sm<3+> and Tm<3+>;wherein said mandrel diameter is selected to be from about 0.1 cm to about 10 cm; andwherein said tension is chosen to avoid undesirable weakening of said non-polarization-maintaining fiber.
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