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Multi Mode Interferometer
A multi-mode interferometer (MMI), also known as a multimode interference coupler, is a micro-scale structure in which light waves can travel, such that the optical power is split or combined in a predictable way. In an MMI, light is confined and guided, and thus the MMI is essentially a broad optical waveguide An optical waveguide is a physical structure that guides electromagnetic waves in the optical spectrum. Common types of optical waveguides include optical fiber waveguides, transparent dielectric waveguides made of plastic and glass, liquid ligh .... For example, an ideal 1x2 MMI would be a 50-50 splitter, such that light enters along one path and exits along two paths, with half the power in each exit path. These entrance and exit paths are narrow waveguides, and the MMI itself is in the shape of a broad rectangular box. An ideal 50-50 splitter is nearly impossible in practice, due to the complex behavior of light. Optical loss will always occur as light travels throug ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Optical Waveguide
An optical waveguide is a physical structure that guides electromagnetic waves in the optical spectrum. Common types of optical waveguides include optical fiber waveguides, transparent dielectric waveguides made of plastic and glass, liquid light guides, and liquid waveguides. Optical waveguides are used as components in integrated optical circuits or as the transmission medium in local and long-haul optical communication systems. They can also be used in optical head-mounted displays in augmented reality. Optical waveguides can be classified according to their geometry (planar, strip, or fiber waveguides), mode structure ( single-mode, multi-mode), refractive index distribution (step or gradient index), and material (glass, polymer, semiconductor). Total internal reflection The basic principles behind optical waveguides can be described using the concepts of geometrical or ray optics, as illustrated in the diagram. Light passing into a medium with higher refractive ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
