| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a phase baseband encoding device for solving the problem that it is not possible to easily detect DC drift. Ž<P>SOLUTION: A control part 15 controls phase modulators 12 and 13 so that each of the combination of phase modulation values ϕ1 and ϕ2 can be used at an uneven proportion, and that the relative phase of a double optical pulse coupled by an optical coupler 14 can be modulated into quaternary. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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