“…For single failure protection of communication network, research work has been carried out in different scenarios: elastic optical networks (EON) [17–21], wavelength‐division multiplexing (WDM) [22, 23], the passive optical network [24], and so on. Ju investigated energy‐efficient directed preconfigured cycles (p‐cycles) for asymmetric traffic protection in EONs against single link failure [17].…”