Optical isolator

Details Optical isolator Optical isolator

1993-02-22

1994-05-31

Ullah, Akm E.

Optical waveguides

Polarization without modulation

G02B 600, G02B 632

Patent

active

053176553

ABSTRACT:
An improved optical isolator of the type having an input optical fiber, a first GRIN lens, a first polarizer, a optical rotator, a second polarizer, a second GRIN lens and an output optical fiber. Lithium niobate and lithium tantalate birefringent crystals are used for lowered costs and high performance. Improvements also include polishing the end of the input optical fiber at a slant and covering the end with a window coated with antireflection material. The surface of the GRIN lens facing the end of the input optical fiber is slant-polished reciprocally and spaced apart with gap which avoids Fabry-Perot interference.

REFERENCES:
patent: 4966444 (1990-10-01), Droegemuller et al.
patent: 5208876 (1993-05-01), Pan

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