Abstract
The phase characteristics of 3 × 3 fibre couplers are investigated with a self-homodyne experiment at 1.3 and 1.5 μm. A 2 × 2 fibre coupler, a fibre delay line and the 3 × 3 fibre coupler under test form a Mach-Zehnder interferometer. The measurement results are compared with values from S-matrix theory for lossy couplers.
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