Optical Wavelength Shifter for Wavelength-Division-Multiplexed Networks
B. Glance and J. M. Wiesenfeld
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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