Polarization-maintaining optical fiber for coupler fabrication

Details Polarization-maintaining optical fiber for coupler fabrication Polarization-maintaining optical fiber for coupler fabrication

G - Physics

02

B

26/197, 88/97.5,

G02B 6/28 (2006.01) G02B 6/10 (2006.01)

Patent

CA 1320373

FN 43439 CAN 5A ABSTRACT OF THE DISCLOSURE Polarization-maintaining coupler is made by a biconically-tapered-fused process from two short lengths of an optical fiber, each having a small, oval stress-applying region that substantially contacts the core. The area of the stress-applying region of the optical fiber is less than 10 percent, preferably less than 2 percent, that of the optical fiber and preferably is contiguous with the core. Couplers of highest quality are made from quartz glass fibers having a birefringence between 1 and 3 x 10-4. It is believed that the principal axes of the oval stress-applying regions of those couplers of highest quality have been collinear or parallel. To permit a coupler to be handled, it can be mounted on a quartz glass substrate with the coupler suspended in air and then potted in a cured elastomer.

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