Beat Interference Analysis between Multi-Position Amplitude-Phase Subcarrier Signals in Direct Photodetection

V. A. Vardanyan ¹*

¹ Siberian State University of Telecommunications and Information Sciences, Novosibirsk, 630102 Russia

Correspondence to: *e-mail: vardgesvardanyan@mail.ru

November 7, 2019

Abstract—The mathematical model for estimating a standard deviation of beat interference generated during photodetection of subcarrier signals with QPSK and M-QAM modulation formats is considered. The theory and the results of computer simulation are used to derive a formula for calculating the spectral distribution of beat interference depending on the number of signals and used modulation formats.

Keywords: single-sideband (SSB) optical modulationdirect photodetectionsignal-to-signal beat interference (SSBI)orthogonal frequency-division multiplexing (OFDM)QPSKM-QAM

DOI: 10.3103/S8756699020030140