Optical Wavelength Shifter for Wavelength-Division-Multiplexed Networks
High capacity optical communications systems can be constructed by wavelength division multiplexing (WDM), in which signals carried at different wavelengths are combined through a single optical fiber transmission network. A WDM network with many users would be based on frequency routing, in which the address of a narrow-bandpass receiver is determined by its assigned wavelength. The capacity of such a wavelength-routed WDM network is limited by the tuning range of the transmitter laser. Frequency reuse within the available optical bandwidth can substantially increase the capacity of such networks.
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