Optical waveguides – Directional optical modulation within an optical waveguide
Patent
1997-08-21
1999-01-12
Ullah, Akm E.
Optical waveguides
Directional optical modulation within an optical waveguide
359161, G02F 1295
Patent
active
058599363
ABSTRACT:
An optical beam splitting device which selectively disables a faulty output port to stop further emission of the optical beam therefrom. When an optical fiber cable is broken or a cable plug is disconnected, some part of the optical beam is reflected at the fiber end face that is left open. An optical sensing device, such as a photodiode, equipped in the beam splitting device receives this reflected light and transduces it into an electrical signal. A reflection detection controller examines this electrical signal and recognizes the presence of the back reflection if the electrical signal exceeds a predetermined reference level. The reflection detection controller then sends a beam control signal to an external modulator disposed at that faulty output port. With the beam control signal, the external modulator varies the intensity of the light beam so that only a limited power will be delivered to the faulty port where the back reflection is observed.
REFERENCES:
patent: 4956702 (1990-09-01), McQuade et al.
patent: 5247382 (1993-09-01), Suzuki
patent: 5253309 (1993-10-01), Nazarathy et al.
patent: 5696859 (1997-12-01), Onaka et al.
Japanese Patent Abstract No. 3-06504, published (Jan. 14, 1991).
Fujitsu Limited
Ullah Akm E.
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