Abstract
We propose a novel polarization dependent frequency shift (PDf) reduction
method for fabricating a silica-based PLC DQPSK demodulator incorporating an
asymmetrically positioned half-wave plate, and demonstrate error-free
43-Gbit/s demodulation for any incident SOP. The PDf has a detrimental
effect on the demodulation performance of a DQPSK signal, and it is degraded
by various kinds of PLC fabrication errors. In this paper, we focus on the
polarization crosstalk in the coupler, which is one of the main causes of
PDf. To eliminate such PDf, we controlled both the position of the half-wave
plate in the MZI and the polarization of the propagated light. We describe
the principle of this PDf reduction method in detail and provide a
theoretical and experimental discussion. In addition, we describe a compact
DQPSK demodulator composed of a single MZI based DQPSK demodulator with a
90-degree optical hybrid. This demodulator configuration can reduce the
receiver's footprint. Finally we achieved a compact DQPSK demodulator with a
low PDf of less than 0.10 GHz in the L-band.
© 2009 IEEE
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription