Optical waveguides – With optical coupler – Plural
Patent
1997-04-02
1999-11-02
Bovernick, Rodney
Optical waveguides
With optical coupler
Plural
385 31, 385 76, 385 88, G02B 626
Patent
active
059785284
ABSTRACT:
A method and various structures are described for reducing excess photon noise in short coherence light sources, such as broadband superfluorescent fiber or superluminescent diodes, for example. The method contemplates splitting the light source signal into a plurality of components, thereby splitting, and reducing, the photon noise or "beat noise" as well as the light intensity. Each component travels in a separate path having a unique time delay which is longer than the coherence time of the light source. The light from each separate path is recombined at an output end, prior to detection, causing the signal to get back to its original intensity, while keeping the total beat noise at a reduced level. The paths may be created using different length polarization maintaining (PM) fibers, different length optical fibers, or multi-mode fibers having several propagation modes propagating at different rates.
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Bovernick Rodney
Kang Ellen E.
Litton Systems Inc.
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