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US 2003/0072056 A1Published application
Wavelength division multiplexer and wavelength division multiplexing system
OwnerTakeshi Otainventor
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OwnerTakeshi Otainventor
Estimating the term…
A wavelength division multiplexer comprising three WDM optical fiber couplers connected in a tree-like configuration. Two multiplexed wavelengths λ2 and λ4 inputted through a common port are split and outputted separately via two branch ports. Wavelengths λ1 and λ3 inputted via two different branch ports are combined and outputted via the common port. The wavelengths λ1, λ2, λ3, and λ4 are set sequentially larger. Isolation between neighboring channels (wavelengths) is low, but isolation between one channel and the channel adjacent to the neighboring channel is sufficiently large. By transmitting light of neighboring channels in opposite directions on the same optical fiber, leakage of the optical signal does not occur even with a low isolation between neighboring channels.
A wavelength division multiplexer comprising a single common port and three or more branch ports such that light received via the common port is split into at least three optical signals of different wavelengths that are transferred to corresponding branch ports, wherein an isolation α between a first wavelength and a second wavelength adjacent to the first wavelength is set to 10-17 dB and an isolation β between the first wavelength and a third wavelength adjacent to the second wavelength is set to 20 dB or greater.
A wavelength division multiplexer comprising a thin film filter type three-port device and WDM optical fiber coupler connected in tandem.
A wavelength division multiplexer comprising a thin film filter type three-port device and a WDM optical fiber coupler, wherein one of branch ports of the three-port device is connected to a common port of the WDM optical fiber coupler.
A wavelength division multiplexer comprising a first thin film filter type three-port device for separating received light into optical signals of a short wavelength band and optical signals of a long wavelength band, and two wavelength division multiplexer units;
A wavelength division multiplexer comprising a thin film filter type three-port device for separating received light into optical signals of a short wavelength band and optical signals of a long wavelength band, and two wavelength WDM optical fiber couplers, wherein the common port of each WDM optical fiber coupler is connected to a branch port of the thin film filter type three-port device.
A wavelength division multiplexing system employing one or more wavelength division multiplexers and configured to perform bi-directional communications over a single optical fiber, while using opposite transmission directions for neighboring wavelengths,
A wavelength division multiplexing system employing one or more wavelength division multiplexers and configured to perform bi-directional communications over a single optical fiber, while using opposite transmission directions for neighboring wavelengths,
A wavelength division multiplexing system employing one or more wavelength division multiplexers and configured to perform bi-directional communications over a single optical fiber, while using opposite transmission directions for neighboring wavelengths,
A wavelength division multiplexing system employing one or more wavelength division multiplexers and configured to perform bi-directional communications over a single optical fiber, while using opposite transmission directions for neighboring wavelengths,
A wavelength division multiplexing system employing one or more wavelength division multiplexers and configured to perform bi-directional communications over a single optical fiber, while using opposite transmission directions for neighboring wavelengths,
Dependencies are inferred from the claim text.