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We demonstrate a PDM-QPSK modulator operating at 100-Gb/s. Two QPSK modulators and a polarization beam combiner are integrated using a hybrid assembly technique with silica PLCs and LiNbO3 phase modulators.
We demonstrate a PDM-QPSK modulator operating at 100-Gb/s. Two QPSK modulators and a polarization beam combiner are integrated using a hybrid assembly technique with silica PLCs and LiNbO3 phase modulators.
We developed a compact RZ-DQPSK modulator using six arrayed optical phase modulators with an LN waveguide, two PLCs with 1times2 couplers and a U-turned waveguide. This modulator exhibited good 111-Gbit/s CSRZ-DQPSK modulation performance.
We have proposed novel transmission formats including CS-RZ, DCS-RZ, and CSRZ-DPSK. We discuss the transmission performance of these formats in the aspect of DWDM and present 40 ch/spl times/43-Gbit/s/ch transmission demonstration with excellent amplifier technology.
A novel compact-spectrum RZ signal is proposed, its bandwidth is approximately twice the bit-rate. It is generated by a single-stage Mach-Zehnder modulator with 2:1 multiplexing function. 50 GHz-spaced 8times20-Gbit/s DWWM transmission is realized
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