10Gbit/s error-free DPSK modulation using a push–pull dual-drive silicon modulator.

Abstract: We experimentally demonstrate a high-speed differential phase shift keying (DPSK) modulation using a silicon push–pull operated dual-drive Mach Zehnder modulator (MZM) based on carrier depletion. 5Gbit/s and 10Gbit/s error-free modulation is demonstrated by demodulating the generated DPSK modulated signal using a demodulation circuit based on a polarization delay interferometer through the use of a differential group delay (DGD). Furthermore, the potential for higher DPSK modulation speeds up to 20Gbit/s is also demonstrated. The obtained results validate the potential to achieve higher order modulation formats, such as quadrature phase shift keying (QPSK), by arranging the MZM in a nested configuration. [Copyright &y& Elsevier]