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Performance of coherent optical square-16-QAM-systems based on IQ-transmitters and homodyne receivers with digital phase estimation

: Seimetz, M.


Institute of Electrical and Electronics Engineers -IEEE-:
Optical Fiber Communication Conference 2006 and the 2006 National Fiber Optic Engineers Conference : Anaheim, California, 5 - 10 March 2006
Piscataway, NJ: IEEE Operations Center, 2006
ISBN: 1-55752-803-9
10 S.
Optical Fiber Communication Conference (OFC) <2006, Anaheim/Calif.>
National Fiber Optic Engineers Conference (NFOEC) <2006, Anaheim/Calif.>
Fraunhofer HHI ()
optical fibre networks; optical modulation; optical receivers; optical transmitters; phase estimation; quadrature amplitude modulation; wavelength division multiplexing

The potential for higher spectral efficiency and recent activities in the area of coherent optical systems raise the interest in new multi-level modulation formats for optical transmission. In this paper square-16-QAM is introduced as a novel candidate for future high-capacity and high spectrally efficient optical systems. Different possible transmitters as well as the homodyne IQ-receiver are illustrated. At the transmitter side the implementation of an electrical level-generator is shown experimentally. At the receiver side options for the realization of the optical 2×4 90°-hybrid are discussed. Furthermore, an algorithm for square-16-QAM digital phase estimation is developed, whose performance and limitations are investigated in simulations.