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An optical fiber reactor (OFR) system containing uniformly distributed quartz fibers coated with titanosilicate ETS-10 crystals was investigated. Optimum ETS-10 film thickness (∼1.5μm) and coating length (15cm) were determined from the light propagation analysis in a single ETS-10-coated fiber. The nearly constant value of the attenuation coefficient (α≈0.10cm⁻¹) for films with different thickness indicated uniform fiber surface coverage with these films. The extinction coefficient, ɛ, decreased from ∼1.6 to ∼1.0μm⁻¹ with ETS-10 film thickness increasing from ∼0.5 to ∼1.5μm, which suggested less contact per unit film thickness between light and ETS-10 crystals inside thicker films, likely due to their lower crystal packing density. Photodegradation of methylene blue (MB) conducted in the OFR showed higher photocatalytic activity for thicker ETS-10 films. Although higher MB photodegradation rates were obtained …