  Bosonization in curved spacetime maps massive Thirring model
(self-interacting Dirac fermions) to a generalized sine-Gordon model, both
living in $1+1$-dimensional curved spacetime. Applying this duality we have
shown that the Thirring model fermion, in non-relativistic limit, gets
identified with the soliton of non-linear Scrodinger model with Kerr form of
non-linearity. We discuss one particular optical soliton in the latter model
and relate it with the Thirring model fermion.
