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Encyclopedia > Cutoff wavelength

In telecommunication, the term cutoff wavelength has the following meanings:


1. The wavelength corresponding to the cutoff frequency.


2. In an uncabled single-mode optical fiber, the wavelength greater than which a particular waveguide mode ceases to be a bound mode.


The cutoff wavelength is usually taken to be the wavelength at which the normalized frequency is equal to 2.405. Note 2 : The cabled cutoff wavelength is usually considered to be a more functional parameter because it takes into consideration the effects of cabling the fiber.


  Results from FactBites:
 
Ridged Waveguide and Transitions (464 words)
In this document, formulae for cutoff wavelength and impedance are established for dual and single ridge waveguides and two examples are provided that illustrate the application to ridge transition design from waveguide to microstrip using a single ridge structure.
The procedure for establishing the cutoff wavelength is that of Marcuvitz [1] pp 399 - 400 and pp 307 - 308 and includes the proximity corrections of Pyle [2].
Although a closed form approximation for cutoff wavelength is available [3], it is observed that it retains a small error in cut off wavelength (~ 2%) as the tapered ridge vanishes at the waveguide port.
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