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Coupling Efficiency of LED to Fiber Optic Guide
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[QUOTE="shjacks45, post: 6369198, member: 670557"] Pretty vague question, lacks purpose. SMD LEDs come in a variety, some with lenses some wirhout. LED range from infrared to ultraviolet with corresponding changes to LED and interface. Laser purpose ranges from illumination to indicator to laser diode. Low power diode has small chip and less diff between emitter and fiber diam. High power is larger emmitting area requiring optics to make beam fit in common fiber sizes. The fiber type (index of refraction, etc.) Is an important variable. Two examples: on circuit board indicators with plastic "rods" from front panel to top of led on circuit board; fiber-optic communication/networking with laser coupled to graduated refractive index fiber that keeps light centered. Multimode fiber typically uses fiber's internal reflections. Both plug fiber directly into the LED part. Since you don't mention using lenses and antireflective coatings, efficency of energy transfer from LED and fiber is not a concern. [/QUOTE]
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Coupling Efficiency of LED to Fiber Optic Guide
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