Light guide structure with multiple entrances

A detection system for light communications, the detection system comprising:

• a total internal reflection (TIR) waveguide comprising:
• a first structure having a first index of refraction, wherein a second index of refraction abutting the first structure is less than the first index of refraction such that light input to the TIR waveguide propagates along the TIR waveguide within the first structure;
• a diffusive element disposed along an internal edge of the first structure at a first location of the TIR waveguide, said diffusive element configured to disrupt the propagation of the light along the TIR waveguide;
• two or more waveguide entrances, each at a corresponding location offset in a first direction along the TIR waveguide from the first location, each of the two or more waveguide entrances configured to:
• collect light associated with the light communications;
• and
• input the collected light to the first structure at the corresponding location to propagate the collected light to the first location;
• wherein at least one of the two or more waveguide entrances is further configured to maintain TIR of the light already propagating along the TIR waveguide within the first structure;
• and
• a light sensor disposed adjacent an edge of the first structure opposite the first location and spaced from the diffusive element by a thickness of the first structure, said light sensor configured to detect the disrupted light.