System for checking the operation of an optical filter
AssigneeMarconi Communications, Inc.
InventorRobert C Goodfellow
Life of this patent
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Abstract
A system for checking the correct operation of a wavelength filter comprising a wavelength filter comprising a first selectively reflective element (SRE) for reflecting a first signal of a first wavelength and a second SRE for reflecting a second signal of a different wavelength. The system also detects the second signal reflected by the second selectively reflective element.
Claims32
A system for checking operation of a wavelength filter, comprising:
- a wavelength filter comprising a first selectively reflective element (SRE) for reflecting a first signal of a first wavelength and a second SRE for reflecting a second signal of a different wavelength;
- and
- checking means for checking the operation of the wavelength filter by detecting the signal reflected by a particular one of the SREs, said first and second SREs being superposed.
A method for checking operation of a wavelength filter comprising a first selectively reflective element (SRE) for reflecting a first signal of a first wavelength and a second SRE for reflecting a second signal of a different wavelength;
- the method comprising the step of detecting the signal reflected by a particular one of the SREs, in which the first and second SREs are superposed.
A wavelength division multiplexing (WDM) switch comprising a system for checking operation of a wavelength filter, in which the system comprises a wavelength filter comprising a first selectively reflective element (SRE) for reflecting a first signal of a first wavelength and a second SRE for reflecting a second signal of a different wavelength;
- the system also comprising checking means for checking the operation of the wavelength filter by detecting the signal reflected by a particular one of the SREs, said first and second SREs being superposed.
A wavelength division multiplexing (WDM) optical communications system comprising a system for checking operation of a wavelength filter, in which the system comprises a wavelength filter comprising a first selectively reflective element (SRE) for reflecting a first signal of a first wavelength and a second SRE for reflecting a second signal of a different wavelength;
- the system also comprising checking means for checking the operation of the wavelength filter by detecting the signal reflected by a particular one of the SREs, said first and second SREs being superposed.
Dependencies are inferred from the claim text.