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Fiber Optic Coupler

A fiber optic coupler is a device used in optical fiber systems with one or more input fibers and one or several output fibers.

Light entering an input fiber can appear at one or more outputs and its power distribution potentially depends on the wavelength and polarization.

Fabrication of Fiber Optic Couplers

Fiber Optic Couplers can be fabricated in different ways. One of those ways is by thermally fusing fibers so that the cores get into intimate contact. If all involved fibers are single-mode (supporting only a single mode per polarization direction for a given wavelength), there are certain physical restrictions on the performance of the coupler. In particular, it is not possible to combine two or more inputs of the same optical frequency into one single-polarization output without significant excess losses. However, such a restriction does not occur for different input wavelengths: there are couplers that can combine two inputs at different wavelengths into one output without exhibiting significant losses. Such couplers are used. Wavelength-sensitive couplers are used as multiplexers in wavelength-division multiplexing (WDM) telecom systems to combine several input channels with different wavelengths, or to separate channels.

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