Optical isolator

Details Optical isolator Optical isolator

1990-11-09

1992-09-29

Lee, John D.

Optical waveguides

Directional optical modulation within an optical waveguide

Magneto-optic

385 4, 385 11, 359281, 359282, G02B 626

Patent

active

051519550

ABSTRACT:
An optical isolator having three or four birefringent crystals and two magneto-optic elements is disposed between two light waveguides to prevent reverse-directed light from returning to the light waveguide on the light-source side. Forward-directed light emitted from the light waveguide on the light-source side is allowed to properly enter into the other light waveguide, whereas the reverse-directed light returning reflectively toward the light waveguide on the light-source side is separated into two polarized component and undergoes polarization rotation while propagating in the optical isolator, to thereby advance out of the optical axis of the light-source side light waveguide.

REFERENCES:
patent: 4178073 (1979-12-01), Uchida et al.
patent: 4239329 (1980-12-01), Matsumoto
patent: 4541691 (1985-09-01), Buzak
patent: 4865429 (1989-09-01), Takeda et al.
patent: 4893890 (1990-01-01), Lutes
Shirasaki et al, "Compact optical isolator for fibers using birefringent wedges", Applied Optics (Dec. 1982) v. 21, No. 23, pp. 4296 to 4299.
Chang et al, "Polarization Independent Isolator Using Spatial Walkoff Polarizers", IEEE Photonics Technology Letter (Mar. 1989) v. 1, No. 3, pp. 68 to 70.

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