High Detuning Cavity Solitons in a Long Fiber Resonator with Raman Gain

Temporal cavity solitons are stable light pulses formed in fiber Kerr resonators, widely studied for frequency comb generation, ultrafast optics, and optical metrology. These solitons result from the interplay of nonlinearity, dispersion, cavity losses, and external driving power [1]. In passive fiber resonators driven by continuous waves, longer cavities support more solitons but suffer from higher losses and limited detuning ranges [2], [3]. Synchronous pulse driving eases detuning constraints but imposes a limit on the number of solitons. Active fiber cavities incorporating erbium amplifiers counter passive losses but are constrained by the saturation power of the erbium gain medium [4]. To achieve high detuning and a large number of solitons, an ideal cavity would combine a long cavity with continuous driving and effective loss compensation. This paper introduces a new type of active fiber Kerr resonator leveraging Raman amplification to counter cavity losses without restricting intracavity power.