Signal detection systems and methods on a fiber carrying multiple wavelengths
AssigneeCiena Corporation
InventorsVipul Bhatnagar, Michael Y. Frankel
Life of this patent
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Abstract
Systems and methods to detect a wavelength of interest (λRX) amongst one or more wavelengths (λ1, λ2, . . . , λN) include receiving the one or more wavelengths (λ1, λ2, . . . , λN); using a portion of a transmitted wavelength (λTX) as a Local Oscillator (LO) signal to perform performing coherent detection with the one or more wavelengths, wherein the transmitted wavelength (λTX) and the wavelength of interest (λRX) are a bi-directional communication link; and determining a presence of the wavelength of interest (λRX) based on the coherent detection.
Claims20
A method to detect a wavelength of interest (λRX) amongst one or more wavelengths (λ1, λ2, . . . , λN), the method comprising:
- receiving the one or more wavelengths (λ1, λ2, . . . , λN);
- using a portion of a transmitted wavelength (λTX) as a Local Oscillator (LO) signal to perform coherent detection with the one or more wavelengths, wherein the transmitted wavelength (λTX) and the wavelength of interest (λRX) are a bi-directional communication link;
- and
- determining a presence of the wavelength of interest (λRX) in the one or more wavelengths based on the coherent detection.
An apparatus adapted to detect a wavelength of interest (λRX) amongst one or more wavelengths (λ1, λ2, . . . , λN), the apparatus comprising:
- one or more couplers adapted to receive the one or more wavelengths (λ1, λ2, . . . , λN) and a portion of a transmitted wavelength (λTX) as a Local Oscillator (LO) signal, wherein the transmitted wavelength (λTX) and the wavelength of interest (λRX) are a bi-directional communication link;
- a plurality of detectors adapted to receive outputs from the one or more couplers, wherein the one or more couplers and the plurality of detectors are adapted to perform coherent detection with the one or more wavelengths and the LO signal;
- and
- an envelope detector adapted to receive a combined output from the plurality of detectors and adapted to determine a presence of the wavelength of interest (λRX) in the one or more wavelengths.
An optical 1+1 path protection system, comprising:
- a splitter adapted to receive and split a transmitted wavelength (λTX), wherein a split portion of a transmitted wavelength (λTX) is used a Local Oscillator (LO) signal;
- a selector adapted to receive two inputs each comprising one or more wavelengths (λ1, λ2, . . . , λN);
- and
- a signal presence monitor adapted to determine a presence of a wavelength of interest (λRX) in each of the two inputs based on coherent detection using the LO signal and the one or more wavelengths (λ1, λ2, . . . , λN), wherein the signal presence monitor is adapted to control the selector based on the presence, and wherein the transmitted wavelength (λTX) and the wavelength of interest (λRX) are a bi-directional communication link.
Dependencies are inferred from the claim text.