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AssigneeFujitsu Limited
InventorsHiroshi Onaka, Hideyuki Miyata, Kazue Otsuka, Yutaka Kai, Tadao Nakazawa, Terumi Chikama
Estimating the term…
In an OADM system, an OADM device includes an AOTF. The AOTF can select an optional wavelength by changing the frequency of an RF signal to be applied. An optical signal having a specified wavelength can be dropped from a wavelength-multiplexed optical signal input from an input terminal, or a wavelength-multiplexed optical signal input from an add port can be multiplexed with a through optical signal. However, considering the increase in coherent cross talk, the AOTF should be exclusively used for dropping in an actual device configuration. Otherwise, a drop optical signal is branched by an optical coupler with the wavelength selected by a tributary station. Thus, the wavelength selected by the tributary station can be extracted by the AOTF from the through optical signal.
A transmission ring system transmitting a plurality of wavelength channels, comprising:
A node used for a transmission ring system which transmits optical signals by a plurality of wavelength channels, comprising:
A transmission ring system transmitting a plurality of wavelength channels, comprising:
A node used for a transmission ring system which transmits optical signals by a plurality of wavelength channels, comprising:
A node used for a transmission ring system transmitting a plurality of wavelength channels, comprising:
A node used for a transmission ring system transmitting a plurality of wavelength channels, comprising:
Dependencies are inferred from the claim text.