ANALYSIS OF BEAT NOISE BETWEEN MULTIPOSITION AMPLITUDE-PHASE SUB-CARRIER SIGNALS IN DIRECT PHOTODETECTION
V. A. Vardanyan
Siberian State University of Telecommunications and Information Sciences, Novosibirsk, Russia
Keywords: однополосная оптическая модуляция (SSB), прямое фотодетектирование, интерференционный шум биений между сигналами (SSBI), ортогональное частотное мультиплексирование (OFDM), QPSK, M-QAM, single-sideband (SSB) optical modulation, direct photodetection, signal-signal beat interference (SSBI) noise, orthogonal frequency-division multiplexing (OFDM), QPSK, M-QAM
Abstract
A mathematical model is considered, which allows one to estimate the root-mean-square deviation of beat noise arising in photodetecting of sub-carrier channel signals with QPSK and M-QAM modulation formats. Based on the theory and simulation results, a formula is derived for calculating the spectral distribution of beat noise as a function of the number of signals and the number of modulation formats used
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