Optical isolator with polarization dispersion and differential t

Details Optical isolator with polarization dispersion and differential t Optical isolator with polarization dispersion and differential t

1993-12-29

1997-05-20

Shafer, Ricky D.

Optical: systems and elements

Polarization without modulation

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

359495, 359496, 359497, 359281, 372703, 385 11, 385 36, G02B 530, G02B 2728, G02F 109

Patent

active

056317719

ABSTRACT:
An optical isolator includes an optical isolator unit including a main polarization discriminator in concatenation with a Faraday rotator, and an auxiliary polarization discriminator disposed in series with the optical isolator unit. One of the polarization discriminators initially divides an applied optical signal propagating in a forward direction along a reference axis into two polarized signals subsequently experiencing polarization dispersion and differential transverse deflection, while the other polarization discriminator eventually eliminates the polarization dispersion. The auxiliary discriminator includes a plate of a uniform thickness inclined at a tilt angle with respect to the reference axis selected so that the transverse deflection difference incurred during the passage through the one polarization discriminator is eliminated in the other polarization discriminator. This facilitates achieving very low polarization dependent loss in the isolator.

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patent: 5278853 (1994-01-01), Shirai et al.
patent: 5315431 (1994-05-01), Masuda et al.
patent: 5446578 (1995-08-01), Chang et al.

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