Production method of polarization maintaining fiber
AssigneeSumitomo Electric Industries, Ltd.
InventorsTetsuya Haruna, Hideyuki Iziri, Motohide Yoshida, Takahiro Seki
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Abstract
The invention provides a production method for a PMF. Two or more bores at regular intervals are formed in a glass rod including a core and a clad so that the bores may be located on a concentric circle around a center axis of the glass rod. A stress applying member is inserted into the bore. The glass rod and the stress applying member may be heated before or after inserting. The glass rod with the stress applying is drawn without exposure to the atmosphere after heating in order to form an optical fiber.
Claims9
A production method of a polarization maintaining fiber, the method comprising the steps of:
- forming two or more bores at predetermined intervals in a glass rod including a core and a clad so that said two or more bores are located on a concentric circle around a center axis of said glass rod;
- inserting a stress applying member into said bores;
- heating said glass rod including the core and the clad and said stress applying member before or after inserting said stress applying member into the bore of the glass rod;
- and
- drawing said glass rod with said stress applying member inserted in said bore without exposure to atmosphere after heating said glass rod with said stress applying member.
Dependencies are inferred from the claim text.