This module specifies the Attributes of the optical paths used in the VL imaging. Each optical path is a combination of illumination, filters, lenses, and sensors, and each combination is identified for possible reference by Attributes in other Modules. Additional optical path parameters may be specified in. (57) An optical path folding element (30, 30a, 30b, 30c, 30d, 30e, 30f) includes a main body (39, 39a, 39b, 39c, 39d, 39e, 39f), a light absorption film layer (320) and a matte structure (330). The main body (39, 39a, 39b, 39c, 39d, 39e, 39f) has an optical surface (310) including an incident. The Transmitter Optical Sub Assembly (TOSA) is responsible for the emission of light.