Optical isolator with reduced relative walk-off

Details Optical isolator with reduced relative walk-off Optical isolator with reduced relative walk-off

1995-10-16

1996-09-24

Dzierzynski, Paul M.

Optical: systems and elements

Polarization without modulation

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

359281, 359496, 385 36, 372703, G02B 530, G02B 2728

Patent

active

055596339

ABSTRACT:
An optical isolator comprises a non-reciprocal rotator disposed between a pair of birefringent wedges, an input wedge and an output wedge. In order to reduce walk-off between the ordinary and extraordinary rays at the output of the isolator in one embodiment, the input signal is made incident on the input wedge at an angle above the normal to the wedge. At a particular angle related to various parameters of the isolator the relative walk-off can be reduced to essentially zero. In another embodiment, the input angle and various isolator parameters are mutually adapted so that the ordinary and extraordinary rays intersect within the isolator.

REFERENCES:
patent: 4548478 (1985-10-01), Shirasaki
patent: 5000546 (1991-03-01), Saito et al.
patent: 5033830 (1991-07-01), Jameson
patent: 5034950 (1991-07-01), Jackel et al.
patent: 5105307 (1992-04-01), Nishiyama et al.
EPO Search Report, W. L. Emkey 5,94308081.2, Feb. 2, 1995.
Emkey, W. L. et al; Proceedings of the Optical Fiber Conference 1989, Houston, Texas.
Shirasaki, M. & Asama, K.; Applied Optics, vol. 21, No. 23, Dec. 1, 1982 pp. 4296-4299 "Compact Optical Isolator for Fibers Using Birefringent Wedges".

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