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Orthogonal frequency division multiplexing (OFDM) is currently discussed as an attractive format to overcome physical impairments in spectrally efficient optical communication links such as modal dispersion, chromatic dispersion and polarization mode dispersion. This paper reviews recent progress in the field.
In this paper, pre-emphasis and RF-pilot tone phase noise compensation are discussed for coherent OFDM transmission systems. It is shown that only 1.6% of the total power is required for the RF-pilot for optimal phase noise compensation.
The ongoing development and deployment of a single seamless converged network responsible for the transmission of voice, video, and data through wireline and wireless applications is creating a complex eco-system. Ethernet has expanded beyond its traditional LAN roots, and is now everywhere. This has resulted in an ecosystem in which IP-based content and applications are transported seamlessly between...
We review recently demonstrated options for serial transport technologies at 100 Gb/s, including binary, multi-level, and coherently detected polarization-multiplexed formats.
The dispersion tolerance in an optical transmission system tends to be proportional to the inverse square of the bit rate of the optical channel. A variety of methods have been used to compensate chromatic dispersion at 10 Gb/s with subsequent improvements in dispersion tolerance ranging from 800 ps/nm to 80,000 ps/nm, and also a range of circuit costs. At 40 and 100 Gb/s not only is the impact of...
We discuss coherent equalization to realize robust 111-Gb/s transmission. For 111-Gb/s POLMUX-RZ-DQPSK we experimentally show the advantage of coherent equalization over direction detection for compensation of both chromatic dispersion and differential group delay.
Digital coherent receivers have enabled ultra-long haul transmission of QPSK data. We outline the principles behind such receivers which have allowed 42.8 Gbit/s data to be transmitted over 6400 km of standard fiber without optical dispersion compensation.
This paper focuses on the design of the components required to realize a 10 Gbaud synchronous optical quadrature phase shift keying (QPSK) transmission system. These are a 5 bit 10 Gsamples/s analog-to-digital converter and a digital signal processing unit for carrier and data recovery.
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