Optical isolator

Details Optical isolator Optical isolator

1996-05-13

1998-10-20

Ngo, John

Optical waveguides

With optical coupler

Particular coupling function

385 34, 385 43, 372703, G02B 626

Patent

active

058259503

ABSTRACT:
An optical isolator for passing light in a forward direction with greater intensity than reverse directed light, is provided. The device includes a conventional isolating means having at least two birefringent crystals, and a non-reciprocal rotating element disposed between the two crystals. The isolating means is disposed between two substantially collimating GRIN lenses, and a thermally expanded core (TEC) output optical fiber is coupled to one of the two lenses and an optical fiber having a thermally expanded core optically coupled to the other of the two collimating lenses. Unwanted reflected incident light is poorly coupled into the input TEC optical fiber due the angle of incidence at the fiber end.

REFERENCES:
patent: 5446578 (1995-08-01), Chang et al.
patent: 5642447 (1997-06-01), Pan et al.
patent: 5642448 (1997-06-01), Pan et al.
patent: 5652814 (1997-07-01), Pan et al.

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