Frequency offset estimation algorithm for a multi-subcarrier coherent fiber optical system

Ryan Ramdial; Xiaojun Liang; Shiva Kumar; John D. Downie; William A. Wood

doi:10.1117/12.2549280

31 January 2020 Frequency offset estimation algorithm for a multi-subcarrier coherent fiber optical system

Ryan Ramdial, Xiaojun Liang, Shiva Kumar, John D. Downie, William A. Wood

Proceedings Volume 11309, Next-Generation Optical Communication: Components, Sub-Systems, and Systems IX; 113090K (2020) https://doi.org/10.1117/12.2549280
Event: SPIE OPTO, 2020, San Francisco, California, United States

Abstract

We introduce a new technique for obtaining the frequency offset introduced at the receiver due to the heterodyning of the transmitter laser and the local oscillator. This technique is needed for multi-subcarrier systems, as the offset must be removed without knowledge of the modulation format, making well-known algorithms that correct using it impractical. By detecting the spectral edges for the transmitted and received signals, it is possible to get a coarse estimate of the intermediate frequency by finding the difference between these two values. We then use this approximation as a starting point to fine search for the true value, by taking a window of possible values around the approximation. By taking the cross-correlation between the received data and a subset of the transmitted data for the subcarriers, we can verify whether the correct value is chosen, and if not, move on to the next estimate.

Citation Download Citation

Ryan Ramdial, Xiaojun Liang, Shiva Kumar, John D. Downie, and William A. Wood "Frequency offset estimation algorithm for a multi-subcarrier coherent fiber optical system", Proc. SPIE 11309, Next-Generation Optical Communication: Components, Sub-Systems, and Systems IX, 113090K (31 January 2020); https://doi.org/10.1117/12.2549280

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