| 摘要 |
A staggered quadrature phase shift keyed modulator which avoids the need for timing circuits. Three phase modulators serially change the phase of a laser beam so that it may sequentially have a total phase shift of pi , pi /2, 0, - pi /2. The input signal is divided into two pulse trains, one of which is delayed to provide the stagger. The two pulse trains are logically combined to form three control signals for the modulators.
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