Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 22, Issue 5, Pages 344-346Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2009.2039748
Keywords
Electrooptic devices; optical modulation; optical planar waveguides; quadrature amplitude modulation (QAM)
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Quadrature amplitude modulation (QAM) is a promising approach for increasing the spectral efficiency of wavelength-division-multiplexing transmission, but its optical implementation is challenging. We demonstrate a 64-level QAM (64QAM) modulator, which uses a signal synthesis in the optical domain. We achieved an integration of low-loss asymmetric couplers and three quadrature-phase-shift-keying modulation circuits using a hybrid configuration of silica-based planar lightwave circuits and an array of LiNbO phase modulators. The modulator successfully operated at 60 Gb/s (10 Gbaud).
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