| http://www.w3.org/ns/prov#value | - In the present invention, the optical spectrum of the transmitted optical electric field 34 (or 34 a-34 e) depends on several factors, including the information bit rate, the number of levels in the transmitted optical electric field (2M???1), the precise choice of those levels, and the choice of encoder (150, 182, 322 or 335), the design of the lowpass filter (180 or 331), and the choice of modul
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