Schematic diagram of fiber optic coupler structure
A fiber optic coupler consists of input and output fibers fused or brought close together in a coupling region where light is transferred between cores, often illustrated with a tapered or fused section connecting the fibers.
Basic Structure
A typical 2×2 directional fiber optic coupler includes the following components:
- Input fibers: Two fibers where light enters the coupler.
- Coupling region: A short section (a few millimeters to centimeters) where the fiber cores are brought into close proximity, allowing evanescent wave coupling. In fused couplers, the fibers are heated and stretched to form a tapered region where light can transfer between cores .
- Output fibers: Two fibers where the light exits, with power distributed between them depending on the coupling ratio.
- Protective housing: Encases the coupling region to maintain alignment and protect the fibers.
Fabrication Methods
- Fused Biconical Taper (FBT): Two fibers are twisted, heated, and stretched to form a narrow coupling region. The refractive index profile in this region allows light to oscillate between the fibers .
- Planar Lightwave Circuit (PLC): Waveguides are etched on a substrate, and fibers are coupled to the input and output ports. This method allows precise splitting ratios and multiple outputs.
- Side-polished or pump combiners: Some couplers expose the fiber core partially to allow light injection from another source or combine pump and signal fibers .
Schematic Representation
A simplified structure diagram can be visualized as:
Input Fiber 1 ─┐ │ │ Coupling Region (fused/tapered) │Input Fiber 2 ─┘ │ ├─> Output Fiber 1 │ └─> Output Fiber 2
- The coupling region is the critical part where light transfers between fibers.
- The length and tapering of this region determine the coupling ratio and wavelength dependence.
- For Y-couplers or tap couplers, one output may carry only a small fraction of the input power for monitoring purposes .
Additional Notes
- Polarization-maintaining couplers use fibers with aligned birefringent axes to preserve polarization.
- Directional couplers allow light to transfer preferentially from one input to a specific output, useful in interferometers or fiber lasers .
- Numerical simulations often show the amplitude distribution along the coupling region, illustrating how light oscillates between the two cores before exiting . This structure diagram and description provide a clear understanding of how fiber optic couplers operate and how light is distributed between fibers.
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