Optical coupler capable of preventing output of unwanted light a

Details Optical coupler capable of preventing output of unwanted light a Optical coupler capable of preventing output of unwanted light a

1996-09-18

1998-02-03

Palmer, Phan T.- H.

Optical waveguides

With optical coupler

Input/output coupler

385 31, 385 42, 385 38, G02B 632

Patent

active

057153400

ABSTRACT:
In an optical coupler comprising a first optical fiber (1) and a second optical fiber (2), first and second outgoing fiber ends of the first and second optical fibers are optically coupled along a predetermined length. First and second incidence fiber ends of the first and second incidence fibers are supplied with first and second lights, respectively. A primary condensing lens (10) is supplied with first and output lights from the first and second optical fibers and condenses the first and second output lights to produce a first condensing light. An optical isolator (8) has an incidence isolator end and an outgoing isolator end. The optical isolator is supplied with the first condensing light from the primary condensing lens through the incidence isolator end to output the first condensing light from the outgoing isolator end. The optical isolator prevents output of an unwanted light at the incidence isolator end. A secondary condensing lens (11) is supplied with the first condensing light from the optical isolator and condenses the first condensing light to produce a second condensing light. A third optical fiber (3) supplied with the second condensing light from the secondary condensing lens. The secondary condensing lens may be omitted.

REFERENCES:
patent: 5195155 (1993-03-01), Shimaoka et al.
patent: 5574809 (1996-11-01), Watanabe et al.

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