  One-dimensional lattices with chiral symmetry are known to possess quantized
Zak phase and nontrivial topological phases. Here it is shown that quantized
Zak phase and nontrivial edge states, partially protected by inversion symmetry
rather than chiral symmetry, can be observed and probed in the bulk exploiting
continuous-time photonic quantum walk in zig-zag waveguide arrays. Averaged
beam displacement measurements can detect quantized Zak phase and non-trivial
topological phases in the extended Su-Schrieffer-Heeger model with broken
chiral symmetry.
