Optical waveguides – With optical coupler – Input/output coupler
Patent
1997-11-12
2000-06-20
Lee, John D.
Optical waveguides
With optical coupler
Input/output coupler
385 24, 385 28, G02B 634
Patent
active
060787090
ABSTRACT:
Embodiments of the invention include an optical fiber system and method for separating the different wavelengths of transmitted light transmitted therethrough and for monitoring the respective optical power in the separated spectral components. More specifically, embodiments of the invention scan or modify the physical parameters of in-fiber gratings that couple light between spatially different modes of light within a wavelength-division-multiplexed (WDM) optical fiber system, separate the spatial modes using a mode-discriminating device (MDD) and monitor or detect the separated spectral components using a conventional or other suitable detector. By scanning the in-fiber gratings, the peak wavelength of coupling between two dissimilar modes is modified, thus allowing control of the coupling within the fiber optic system. Scanning the grating is performed, e.g., by changing the temperature or modifying the physical dimensions of the grating. In one embodiment, the system employs a long-period grating that couples light between two co-propagating, spatially different modes. In an alternative embodiment, the system uses a short-period grating that couples light between a forward propagating mode and a spatially dissimilar, backward propagating mode.
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Abramov Anatoli A.
Hale Arturo
Mock Joel Leslie
Strasser Thomas A.
Vengsarkar Ashish Madhukar
Hao Victoria D.
Harman John M.
Lee John D.
Lucent Technologies - Inc.
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