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A vector-modulator-based phase shifter for 43-Gbps RZ-DQPSK optical transceivers was developed by using InP HBTs. The weighting of the vector paths is controlled by a novel pseudo-sine-cosine generator using folding circuit, which covers the phase-control range of 810° with only one control voltage. To reduce the process, voltage, and temperature (PVT) dependence, a PVT compensation circuit is newly...
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