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Nonlinear tolerant constant modulus multi-dimensional modulation formats for coherent optical communication systems
Nonlinear tolerant constant modulus multi-dimensional modulation formats for coherent optical communication systems
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机译:相干光通信系统的非线性容限恒定模量多维调制格式
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摘要
Constant modulus multi-dimensional modulation system and methods are disclosed herein, employing multi-intensity quadrature amplitude modulation (QAM) to generate a dual-polarization symbol. j bits may be mapped to one of a plurality of dual-polarization symbols having a same constant power modulus on a two-level constellation including first and second intensity rings in a four-dimensional (4D) space including in-phase (I), quadrature (Q), X polarization (Xpol) and Y polarization (Ypol). A first bit of the j bits may indicate that the symbol is on the first intensity ring for the Xpol and the second intensity ring for the Ypol, a next k bits may indicate a location of the symbol on the first intensity ring in the Xpol, and a remaining j−k−1 bits may indicate a location of the symbol on the second intensity ring in the Ypol. Maximum correlation decoding may be used to decode the first symbol at the receiver.
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