Abstract
We discuss the use of a coherent digital receiver for the compensation
of linear transmission impairments and polarization demultiplexing in a transmission
system compatible with a future 100-Gb/s Ethernet standard. We present experimental
results on the transmission performance of 111 Gbit/s POLMUX-RZ-DQPSK. For
a dense WDM setup with channels carrying 111 Gbit/s with a 50 GHz channel
spacing (2.0 bits/s/Hz), we show the feasibility of 2375 km transmission.
This is enabled through coherent detection which results in excellent noise
performance, and subsequent electronic equalization which provides the high
tolerance to polarization mode dispersion and chromatic dispersion (CD). Furthermore,
we discuss the impact of sampling and digital signal processing with either
1 or 2 samples/bit. We show that when combined with low-pass electrical filtering,
1sample/bit signal processing is sufficient to obtain a
large tolerance towards CD. The proposed modulation and detection techniques
enable 111 Gbit/s transmission that is directly compatible with the existing
10 Gbit/s infrastructure.
© 2007 IEEE
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