The recommended solution involves using a dichroic mirror to combine the light from both LEDs directly into one fiber, eliminating the need for complex fiber-to-fiber coupling. Additionally, condenser lenses are suggested to focus the light onto the fiber tip for optimal coupling. Optical fiber couplers for various LEDs and light sensors are commercially available, but you can skip the connector and simply connect silica and plastic fibers directly to LEDs and sensors. For the examples described here, I used LEDs encapsulated in standard 5mm clear epoxy packages, and. The almost obvious solution is fiber optic cable: I've got some 20 cm long PVC-coated 2 mm diameter glass fiber. NO USE: Everything (fiber, coating, and even my fingers, ouch!) got glued, but not. What is the best method to attach fiber optic strand to an LED? Light pipes are another option. Here we will share one of our favorite methods using heat shrink tubing. Using a fiber optic connector is a great way to firmly hold your LED and cables in place.