We present an all-fiber tunable dispersion compensator based on a pair of fiber stretchers made with different fiber types in which the group delay and the second-order dispersion can be tuned independently. Its efficiency is demonstrated in a fiber-based optical coherence tomography (OCT) system operating in the 800 nm wavelength range. The average sample dispersion in OCT imaging or the dispersion of transmission lines could also be compensated by our system.

a b s t r a c tDispersion compensation up to the third order is experimentally demonstrated by using a dual-fibre stretcher combined with the coma of an imaging lens, in a fibre-based scan-free time domain optical coherence tomography system, leading to an axial resolution of less than 3 μm.

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