Optical demultiplexing device and optical monitoring device
AssigneeFujitsu Limited
InventorHaruhiko Tabuchi
Life of this patent
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Abstract
An optical demultiplexing device used in an optical monitoring device includes an input port and an output port unit including a plurality of ports, and separates a WDM light of plural channels, which is input from the input port, for each wavelength to output to the output port unit. The output port unit includes a plurality of output port sets each of which includes at least two individual output ports as a set, and crosstalk between adjacent individual output ports in a single output port set is larger than crosstalk between adjacent individual output ports belonging to different output port sets.
Claims20
An optical demultiplexing device that splits a wavelength division multiplexing (WDM) signal into a plurality of channel signals of an identical diffraction order, comprising:
- a first output port set that includes a first output port and a second output port to each of which one of the channel signals is input so that a wavelength shift of the channel signal from a center wavelength of the first output port set is calculated based on an intensity ratio of an optical signal output from the first output port and an optical signal output from the second output port;
- and
- a second output port set that includes a third output port and a fourth output port to each of which another one of the channel signals is input so that a wavelength shift of the another channel signal from a center wavelength of the second output port set is calculated based on an intensity ratio of an optical signal output from the third output port and an optical signal output from the fourth output port, wherein:
- the second output port set is adjacent to the first output port set, the third output port is adjacent to the second output port, and
- optical crosstalk between the first output port and the second output port and optical crosstalk between the third output port and the fourth output port are larger than optical crosstalk between the second output port and the third output port.
An optical monitoring device comprising:
- an optical demultiplexing unit that splits a wavelength division multiplexing (WDM) signal into a plurality of channel signals of an identical diffraction order, and includes
- an output port set that has a first output port and a second output port to each of which one of the channel signals is input;
- and
- a signal processing unit that calculates a wavelength shift Δλ of the channel signal from a center wavelength of the output port set based on an intensity ratio of an optical signal output from the first output port and an optical signal output from the second output port.
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Dependencies are inferred from the claim text.