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Patent

Article comprising a wavelength selective add-drop multiplexer

TLDR
In this paper, a wavelength selective add-and-drop multiplexer is described for adding and/or dropping spectral components from a wavelength-division-multiplexed optical signal.
Abstract
A wavelength-selective add-drop multiplexer is disclosed for adding and/or dropping spectral components from a wavelength-division-multiplexed optical signal. (1x1) or (2x2) optical switches are used, either alone or in conjunction with other optical elements, to separate spectral components identified for drop from other spectral components.

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Citations
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References
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Patent

Optical add-drop multiplexers for WDM optical communication systems

TL;DR: In this article, an optical add-drop multiplexer for wavelength division multiplexed optical communication systems was proposed, which includes first and second optical couplers which optically communicate with each other through an optical filter.
Patent

Optical add-drop multiplexer

TL;DR: In this article, the authors proposed an optical add-drop multiplexer capable of giving improved characteristics with a simple, inexpensive arrangement which needs not a corresponding number of optical bandpass filters to the wavelength components of a light signal to be carried.
Patent

Tunable add drop optical filtering method and apparatus

TL;DR: In this paper, a tunable add/drop filter that utilizes the unique operational characteristics of a wavelength grating router (WGR) is proposed. But it does not specify the frequency components of the WDM signal at different outputs.
Journal ArticleDOI

Tunable add/drop optical filter providing arbitrary channel arrangements

TL;DR: A novel add/drop optical filter providing arbitrary channel arrangements between two input wavelength division multiplexing (WDM) signals and two output WDM signals is presented.
Patent

Efficient electromechanical optical switches

TL;DR: In this article, a planar reflector which is aligned to reflect one of a pair of signals crossing between two collimating lenses can also reflect the other crossing signal, thereby providing highly efficient multiple signal switching.