  Dissipative structures are the result of spontaneous symmetry breaking in a
dynamic open system, which is induced by either the nonlinear effect or loss
fluctuations. While optical temporal dissipative solitons in nonlinear Kerr
cavities has been widely studied, they are operated in a red-detuned regime
that is non-trivial to access. Here, we demonstrate an emergent dissipative
soliton state in optical cavities in the presence of loss fluctuations, which
is accessible by self-evolution of the system and is operated in resonance. We
numerically investigate both the effect of loss modulation and the effect of
saturable absorption, based on a standard dissipative and Kerr-nonlinear
microresonator model, and observe stable soliton states in a close-to-zero
detuning region. The self-starting soliton state working in resonance is
potentially of wide interest, which would not only ease the operation for
ultrafast temporal soliton generation, but also imply a high conversion
efficiency for soliton micro-combs.
