Stable radio frequency dissemination in a multi-access link based on passive phase fluctuation cancellation

Phase-Stabilized Side-Branch RoF Link for Extensible Frequency Dissemination in Distributed Systems

“…As the number of remote stations sharply increasing in applications (e.g. in the squared kilometer arrays), different one-to-multipoint time and frequency delivery schemes have been proposed-the extensibility of synchronization system has been taken into consideration [23][24][25][26][27][28]. Unlike the GNSS-based synchronization, which is inherently capable of broadcasting time and frequency to multiple users, it is much harder for the ground-based sync system like optical fiber links to disseminate frequency to multiple locations.…”

“…Unlike the GNSS-based synchronization, which is inherently capable of broadcasting time and frequency to multiple users, it is much harder for the ground-based sync system like optical fiber links to disseminate frequency to multiple locations. In principle, the one-to-multipoint fiber-based sync schemes employ either a bus topology [23][24][25] or a ring-form topology [26][27][28] bus-topology and ring-form one-to-multipoint solutions, it has been realized by researchers that constructing a frequency dissemination network with branch topology may have unique advantage. Figure 1 illustrates this side-branch synchronization concept.…”

A dispersion‐free multi‐access RF dissemination link with phase jitter compensation

“…Theoretically, the PPCT based on phase conjugation correction ensures fast responses and infinite dynamic ranges. Some PPCT‐based distributed systems, such as tree‐like topology fibre‐optic networks [3, 4], fibre‐optic loop links [5, 6], and bus topology fibre‐optic links [7, 8], have been specially designed for stable RF dissemination in multi‐access links. However, all of the previously proposed schemes suffer from the dispersion‐induced power fading or the Rayleigh backscattering noise, which degrades the signal‐to‐noise ratio and the phase stability of the recovered signals at remote sites.…”

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

“…However, the limited phase adjustment range of the compensator makes the APCT not suitable for long-haul transmission systems in harsh environments. Passive phase compensation technique (PPCT) [8][9][10][11][12][13] offers the advantage of an infinite compensation range compared to the APCT, but the phase stability of the compensated signal at a remote site is affected by the time variation caused by the asymmetry of the optical path when two or more optical carriers are used. Although the use of one laser can avoid the asymmetry-induced time variation, there is still a small amount of time jitter in the scheme proposed in [14] that is not compensated.…”