954P Mini-Coupler
Description
Fibers are side polished in glass substrate blocks to remove cladding material on one side of the core without distorting the core region. In the case of PM fibers, one stress member remains. Two polished fibers are placed into optical contact with their polarization axes aligned, and coupling from core to core occurs by the evanescent wave interaction. Precise loading of the substrate blocks ensures the fibers remain in low stress contact over a broad range of temperatures. Polarization isolation of -30 dB is attainable using this technique.
Evanescent wave couplers offer inherent performance advantages because there is no deformation or tapering of the waveguiding cores. These devices have low loss and backreflection. Also, short interaction lengths (1-2 mm) allow small device packages to be realized. The interface essentially vanishes with optical contact between identical silica surfaces. There is no intermediate material which can change its refractive index or thickness with age or environmental effects. The coupler behaves optically as if the fibers were fused and is very stable with temperature variations.
954P Mini-Coupler
Features
Low loss and backreflection
High isolation
Small ratio variation with temperature
Compact package
Standard polarization maintaining (PM) fibers
Low ratio taps with PM or SM output
Bandwidth is a function of Coupling Ratio
Operates on slow and fast axis
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Frequently Asked Questions
Evanescent wave couplers have low loss and backreflection, short interaction lengths, and no deformation or tapering of the waveguiding cores.
The 954P Mini-Coupler is used for coupling from core to core in fibers.
The bandwidth of the 954P Mini-Coupler is a function of the coupling ratio.
The polarization isolation of the 954P Mini-Coupler is -30 dB.
The 954P Mini-Coupler can be used with standard polarization maintaining (PM) fibers and low ratio taps with PM or SM output.