It is an object of the present invention to provide an optical modulator which is capable of adjusting optical intensity of optical signals which contains non-desired components so that the intensity of the components become at a similar level, whereby the optical modulator is capable of effectively suppressing the non-desired components when the optical signals are combined. In a multi-pass aftertreatment system, a manifold has at least one inlet and a plurality of outlets. Proximate the first lateral edge is positioned a first securing component and proximate the second lateral edge is positioned a second securing component, both securing components for securing the body to the wheelchair. This abstract itself is not intended to limit the scope of this patent. The foil separator is folded in a manner that divides the fire suppression agent into smaller portions.