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  2. Optical path length - Wikipedia

    en.wikipedia.org/wiki/Optical_path_length

    An electromagnetic wave propagating along a path C has the phase shift over C as if it was propagating a path in a vacuum, length of which, is equal to the optical path length of C. Thus, if a wave is traveling through several different media, then the optical path length of each medium can be added to find the total optical path length. The ...

  3. Optical path - Wikipedia

    en.wikipedia.org/wiki/Optical_path

    Optical path (OP) is the trajectory that a light ray follows as it propagates through an optical medium. The geometrical optical-path length or simply geometrical path length ( GPD ) is the length of a segment in a given OP, i.e., the Euclidean distance integrated along a ray between any two points. [ 1 ]

  4. Lightpath (optical network) - Wikipedia

    en.wikipedia.org/wiki/Lightpath_(optical_network)

    When a lightpath can be established between source and destination node endpoints the connection is totally optical and avoids throttling by intermediate electronic conversions and processing. [1] Where a lightpath passes through an Optical add-drop multiplexer (OADM) is known as a cut-through lightpath .

  5. Lightpath - Wikipedia

    en.wikipedia.org/wiki/Lightpath

    Optical path, the path taken by light in traversing a system; Lightpath (optical network), a section of an optical network that light travels through without being modified; An internet and telephone service provided by Altice USA; Lightpaths, a 1997 novel by Howard V. Hendrix

  6. Routing and wavelength assignment - Wikipedia

    en.wikipedia.org/wiki/Routing_and_wavelength...

    This algorithm calculates the shortest path using the number of optical routers as the cost function. A single probe is used to establish the connection using the shortest path. The running time is the cost of Dijkstra's algorithm: O ( m + n log ⁡ n ) {\displaystyle O(m+n\log n)} , where m {\displaystyle m} is the number of edges and n ...

  7. Bidirectional reflectance distribution function - Wikipedia

    en.wikipedia.org/wiki/Bidirectional_reflectance...

    Diagram showing vectors used to define the BRDF. All vectors are unit length. points toward the light source. points toward the viewer (camera). is the surface normal.. The bidirectional reflectance distribution function (BRDF), symbol (,), is a function of four real variables that defines how light from a source is reflected off an opaque surface. It is employed in the optics of real-world ...

  8. Cassegrain reflector - Wikipedia

    en.wikipedia.org/wiki/Cassegrain_reflector

    Light path in a Cassegrain reflecting telescope. The Cassegrain reflector is a combination of a primary concave mirror and a secondary convex mirror, often used in optical telescopes and radio antennas, the main characteristic being that the optical path folds back onto itself, relative to the optical system's primary mirror entrance aperture.

  9. Folded optics - Wikipedia

    en.wikipedia.org/wiki/Folded_optics

    Folded optics is an optical system in which the beam is bent in a way to make the optical path much longer than the size of the system. This allows the resulting focal length of the objective to be greater than the physical length of the optical device. Prismatic binoculars are a well-known example.