Polarization-maintaining optical fibers for coupler fabrication

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

1988-09-01

1990-03-06

Gonzalez, Frank

350 9615, 350 9620, G02B 610

Patent

active

049060686

ABSTRACT:
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.times.10.sup.-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.

REFERENCES:
patent: 4801189 (1989-01-01), Shaw et al.

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