Connector employing mode field modification

Details Connector employing mode field modification Connector employing mode field modification

1987-05-21

1988-08-16

Sikes, William L.

350 9620, 350 9633, G02B 626

Patent

active

047639768

ABSTRACT:
Disclosed is a mode field modifier for use with an optical fiber having a core and a cladding of outside diameter d. The modifier comprises a modifier core having a refractive index n.sub.1. Surrounding the modifier core is first cladding layer having a refractive index n.sub.2 that is less n.sub.1. On the surface of the first cladding layer is a second cladding layer having a refractive index n.sub.3 which is less than n.sub.2. The modifier is tapered intermediate its ends whereby it has a large diameter end and a small diameter end. The diameters of at least the core and first cladding layer at the large diameter end are greater than the corresponding diameters at the small end. The diameter D.sub.1 of the first cladding layer at the large diameter end is greater than d. An axially disposed hole in the large diameter end receives a fiber which is held in such alignment with the mode field modifier that it is in light coupling relationship with the modifier core. The mode field of a signal coupled from the fiber to the mode field modifier expands as it propagates though the tapered portion of the modifier to the small diameter end. An in-line coupler between two optical fibers is effected by connecting together in axial alignment two such mode field modifiers with their small diameter ends adjacent one another.

REFERENCES:
patent: 3779628 (1973-12-01), Kapron et al.
patent: 4252403 (1981-02-01), Salisbury
patent: 4415227 (1983-11-01), Unger
patent: 4465335 (1984-08-01), Eppes
patent: 4521070 (1985-06-01), Sottini et al.
patent: 4654532 (1987-03-01), Hirschfeld
patent: 4678267 (1987-07-01), Burns et al.
patent: 4688884 (1987-08-01), Scifres et al.

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