| http://www.w3.org/ns/prov#value | - An input optical signal is split into N channels of optical signals, in which N is an integer greater or equal to 2; band-pass filtering is performed on the split N channels of optical signals, in which central frequencies of a frequency band used in the performing of band-pass filtering on the N channels of optical signals are not exactly the same, and a passband of the frequency band and a frequ
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