Patent
1985-11-21
1988-10-11
Wan, Gene
350 9620, G02B 626
Patent
active
047766590
ABSTRACT:
An optical isolator that includes a light emitter unit for converting an input electric signal to a corresponding light signal and a light detector unit for converting the light signal to a corresponding output electric signal, both units having a casing of the same diameter and a central port. The emitter unit is optically joined to the detector unit by a coupler formed of concentric layers of transparent dielectric material constituted by a core disposed within a cladding tube of the same length to define a light pipe and a sleeve surrounding the tube and projecting therefrom at either end to define input and output sockets to snugly receive the units with the ports thereof in juxtaposition to the opposite ends of the core. The core and the cladding tube of the light pipe have different indexes of refraction, whereby light from the emitter unit is propagated by multiple internal reflections to the detector unit. The sleeve has a different index of refraction from that of the tube, whereby the interface therebetween is reflective with respect to external light.
REFERENCES:
patent: 3825319 (1974-07-01), Cook et al.
patent: 4188087 (1980-02-01), D'Auria et al.
patent: 4270049 (1981-05-01), Tanaka et al.
Ebert Michael
Wan Gene
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