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Definition of Coupler/Splitter terms
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| I1: Input fiber 1 I2: Input fiber 2 O1: Output fiber 1 O2: Output fiber 2 |
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| Excess Loss (dB) = -10 Log ((O1+O2)/I1) |
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| Coupling Ratio (%) = O2/(O1+O2) |
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Coupling Loss (dB) @ O1 : -10 Log(O1/(O1+O2))
Coupling Loss (dB) @ O2 : -10 Log(O2/(O1+O2)) |
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| Insertion Loss: Excess Loss + Coupling Loss + Polarizaton Effects (Single mode only) |
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| Uniformity (dB): Maximum Insertion Loss - Minimum Insertion loss |
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| Directivity (dB): -10 Log ( I2 / I1 ) (With all outputs terminated for zero reflection) |
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Return Loss (Back reflection)
Return loss is loss of signal when light that is reflected back along the path of transmission, from either the coupling region, the connector or a terminated fiber. |
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Polarization (Single mode only) and Thermal stability
Maximum change in coupling ratio through all polarization orientations and/or specified temperature ranges. |
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| Definition of singlemode Wavelength Division Multiplexer / Demultiplexer terms |
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| Insertion Loss : Excess Loss + Coupling Loss at Wave1 and Wave2 |
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Isolation (dB)
The optical power separation in channel O1 and O2 between the specified wavelengths. Assumes input levels are the same for each wavelengths. |
