Optical device of enhanced optical isolation at various waveleng

Optical: systems and elements – Optical modulator – Light wave directional modulation

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359280, 359283, G02B 2608, G02F 109

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active

059698497

ABSTRACT:
An optical isolator comprises two polarizers arranged before and after an optical rotator and a magnet surrounds the optical rotator. The magnet may generate a magnet field with a direction in spatial space parallel to the propagation direction of light traveling in the optical rotator and a strength sufficient to rotate the light to a predetermined rotation angle. Preferably, the polarizers are birefringent wedges of identical shape and optical properties. The magnet in accordance with the present invention may have a pair of magnetic adapters to generate the desired direction and strength of magnetic field. The direction of magnetic field varies in three-dimension space as the magnet is adjusted. The present invention provides an optical isolator of high isolation for high-volume mass production at a low cost. In particular, it may be easily operated at different wavelengths to achieve desired isolation without sacrifice of other optical properties of the optical isolator.

REFERENCES:
patent: 5111330 (1992-05-01), VanDelden et al.
patent: 5602673 (1997-02-01), Swan
patent: 5661829 (1997-08-01), Zheng

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