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PDM-QPSK Modulator With a Hybrid Configuration of Silica PLCs and LiNbO _{3} Phase Modulators

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4 Author(s)
Yamazaki, H. ; NTT Photonics Labs., NTT Corp., Atsugi, Japan ; Yamada, Takashi ; Goh, T. ; Kaneko, A.

We discuss detailed characteristics of a polarization-division-multiplexed quadrature-phase-shift-keying (PDM-QPSK) modulator with a hybrid configuration of silica planar lightwave circuits (PLCs) and LiNbO3 (LN) phase modulators. With a polarization multiplexing circuit consisting of a half-wavelength plate (HWP) and a Mach-Zehnder-type polarization beam combiner (PBC) in a PLC, the modulator outputs a PDM-QPSK signal with a inter-polarization-channel crosstalk smaller than -40 dB. The modulator also has a small insertion loss of 5.0 dB (7.7 and 8.4 dB for each polarization), and successfully operates at 100 Gb/s.

Published in:

Lightwave Technology, Journal of  (Volume:29 ,  Issue: 5 )