  We introduce a programmable 8-port interferometer with the recently proposed
error-tolerant architecture capable of performing a broad class of
transformations. The interferometer has been fabricated with femtosecond laser
writing and it is the largest programmable interferometer of this kind to date.
We have demonstrated its advantageous error tolerance by showing an operation
in a broad wavelength range from $920$ to $980$ nm, which is particularly
relevant for quantum photonics due to efficient photon sources. Our work
highlights the importance of developing novel architectures of programmable
photonics for information processing.
