  Photonic time-stretch overcomes the speed limitation of conventional
digitizers, and enables the observation of non-repetitive and statistically
rare phenomena that occur on short timescales. In most of the time-stretch
applications, large temporal dispersion is highly desired to satisfy the
far-field diffraction regime. However, most conventional spatial disperser or
chirped fiber Bragg grating are constrained by its spatial volume, which can be
overcome by the ultra-low-loss dispersive fiber, as an ideal medium for large
temporal dispersion , while it suffers from the third-order dispersion and
aberrations. In this paper, an optical phase conjugation based third-order
dispersion compensation scheme is introduced, with accumulated dispersion and
eliminated third dispersion, and achieved negative and positive 3400-ps2 pure
temporal dispersion of over 30-nm bandwidth. Leveraging this pure temporal
dispersion, up to 2% temporal aberrations have been eliminated; furthermore, a
Fourier domain spectroscopy has achieved a record 15000 optical effective
resolvable points, with non-degraded 2-pm resolution over 30-nm range
