Optical isolator

Details Optical isolator Optical isolator

1994-03-04

1996-11-12

Nelms, David C.

Optical: systems and elements

Polarization without modulation

Polarization using a time invariant electric, magnetic, or...

359487, 359494, 372703, G02B 2728

Patent

active

055745954

ABSTRACT:
A polarization independent optical isolator for use in optical communication systems is provided. This optical isolator functions to provide dual-way optical isolation wherein an input optical signal entering in the isolation direction is transmitted through the optical isolator twice using a reflecting member, and includes a magnetooptic plate and a birefringent plate disposed between the magnetooptic plate and the reflecting member. The birefringent plate aligns two linearly polarized optical signals in a transmitting direction, having planes of polarization rotated through a predetermined angle by the magnetooptic plate, on a given optical path with a preselected spatial displacement therebetween for allowing transmission of the optical signals traveling in the transmitting direction, while it orients two linearly polarized optical signals in the isolation direction, having planes of polarization rotated through the predetermined angle by the magnetooptic plate, out of the given optical path for blocking transmission of the optical signals traveling in the isolation direction.

REFERENCES:
patent: 4548478 (1985-10-01), Shirasaki
patent: 4893890 (1990-01-01), Lutes
patent: 5033830 (1991-07-01), Jameson
patent: 5381261 (1995-01-01), Hirai et al.

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