Multi-port optical isolator

Details Multi-port optical isolator Multi-port optical isolator

1998-06-18

2000-06-13

Shafer, Ricky D.

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359282, 359484, 359495, 359497, 372703, 385 11, 385 24, 385 33, 385 73, 385 74, G02B 530, G02B 626, G02B 632, G02F 109

Patent

active

06075642&

ABSTRACT:
An optical nonreciprocal apparatus, preferably an optical isolator, and a method of isolating propagation of light signals from multiple input optical fibers to multiple output optical fibers utilize compact isolator chips formed by a nonreciprocal rotator assembly that is sandwiched between two walk-off crystals. The nonreciprocal rotator assembly provides 90.degree. rotation of polarization components of forward propagating light beams, while providing 0.degree. rotation for rearward propagating light beams. In one embodiment, the optical nonreciprocal apparatus includes two isolator chips between an array of lenses to provide two-stage optical isolator. Preferably, the walk-off crystals in the second isolator chip provide displacement of aligned polarization components of forward propagating light beams in a direction that is perpendicular to the walk-off directions of the walk-off crystals in the first isolator chip. In another embodiment, the array of lenses are replaced by two converging lenses that are arranged in optical series. The first lens inversely project parallel light beams onto the second lens, in a diverging manner.

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