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US 2019/0097727 A1Published application
Signal loopback circuit and signal loopback method
AssigneeNEC Corporation
InventorSatoshi MIKAMI
Life of this patent
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AssigneeNEC Corporation
InventorSatoshi MIKAMI
Estimating the term…
Provided is a signal loopback circuit which, in order to loop back a monitoring signal in a relay device for relaying optical signals of a plurality of wavelength bands, connects between a channel of first direction and a channel of second direction through which an optical signal of first wavelength band and an optical signal of second wavelength band are transmitted, wherein the signal loopback circuit is provided with a first coupler for branching the optical signal on the channel of first direction, a first filter for extracting at least one of a monitoring signal of first wavelength band and a monitoring signal of second wavelength band that are used in the channel of first direction from the optical signal branched by the first coupler, and a second coupler for causing the monitoring signal extracted by the first filter to be joined to the channel of the second direction.
A signal loopback circuit that makes connection between a channel of a first direction and a channel of a second direction, through which an optical signal of a first wavelength band and an optical signal of a second wavelength band are transmitted, the signal loopback circuit comprising:
A signal loopback method of making connection between a channel of a first direction and a channel of a second direction, through which an optical signal of a first wavelength band and an optical signal of a second wavelength band are transmitted, the signal loopback method comprising:
Dependencies are inferred from the claim text.