Same Wavelength Transmission of Frequency Standards and 224-Gb/s Coherent Optical Communication over 7-core fiber

Abstract

We propose and experimentally demonstrate a hybrid transmission scheme that combines radio frequency standards with coherent optical communication on a same wavelength over 1-km 7-core fiber. We use a pilot tone assisted Costas Loop (PACL) module for DSP-free polarization and coherent demultiplexing of 224-Gb/s DP-16QAM signals in the optical domain based on frequency-synchronous optical network (FSON). This PACL module can also be employed for frequency standards comparison between the transmitter and the receiver. The system achieves an Allan deviation (ADEV) of 4.7×10-12 of 10-MHz radio frequency at 1s and 6.8×10-15 at 10000s, which can support frequency standards comparison at the level ..