Stable photonic transmitting link based on passive phase compensation with active-assisted control method

The authors demonstrate a photonic link for stable radio frequency (RF) dissemination over fibre based on passive phase compensation with an active-assisted control method. A variable optical delay line is introduced in the transmitting link for active-assisted phase compensation. After active-assisted compensation, the residual jitter is <500 fs. Experimentally, an RF signal at a frequency of 5 GHz is successfully transmitted over a 20-km fibre link, with the stability of 2.49 × 10 ⁻¹⁴ at 1 s and 9.19 × 10 ⁻¹⁸ at 10 ⁴ s.