Flexible ROADM-less optical hub and spoke node architecture for coherent transponders

摘要

One embodiment provides a network node of a metro optical network that includes first and second optical filters. The first optical filter is configured to pass wavelength channels in a first wavelength band and block wavelength channels in a non-overlapping second wavelength band. The second optical filter is configured to block wavelength channels of the first wavelength band and pass wavelength channels of the second wavelength band. An optical splitter is configured to split a received optical signal into first and second signal portions and to direct the first signal portion to the first optical filter. An optical combiner is configured to combine output of the second optical filter with the second signal portion from the optical splitter. An optical transceiver is configured to recover data from a first wavelength channel passed by the first optical filter, and to output a second wavelength channel passed by the second optical filter.

主权项

1. An apparatus, comprising:
a first optical splitter configured to split a received wavelength-division multiplexed (WDM) optical signal into first and second signal portions; a first high-pass optical filter configured to pass shorter-wavelength channels of the first signal portion in a first wavelength band and to block longer-wavelength channels of the first signal portion in a non-overlapping second wavelength band, a shortest-wavelength channel of said second wavelength band being longer than a longest-wavelength channel of said first wavelength band a first low-pass optical filter configured to block the shorter-wavelength channels and to pass the longer-wavelength channels; and an optical combiner configured to combine the second signal portion with an added wavelength channel passed by the first low-pass optical filter.