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Table 1.
Average values of strength (a) and slope (s, see Eq. (2)) of the DFT spectrum of modal noise generated under different conditions.
| Fiber | Double scrambler | Shaker | Under-fill | Disturbance | a | s |
|---|---|---|---|---|---|---|
| Circular ⊘85 μm | No | No | Near-field | Changed illumination | −2.0 | 5.9 |
| Circular ⊘85 μm | No | No | Near-field | Moved fiber | −2.1 | 6.1 |
| Circular ⊘85 μm | No | No | Far-field | Changed illumination | −1.7 | 6.0 |
| Circular ⊘85 μm | No | No | Far-field | Moved fiber | −1.7 | 5.9 |
| Circular ⊘85 μm | No | Yes | Near-field | Changed illumination | −3.6 | 4.0 |
| Circular ⊘85 μm | No | Yes | Near-field | Moved fiber | −4.0 | 3.9 |
| Circular ⊘85 μm | No | Yes | Far-field | Changed illumination | −3.8 | 4.1 |
| Circular ⊘85 μm | No | Yes | Far-field | Moved fiber | −4.1 | 3.9 |
| Circular ⊘85 μm | Yes | No | Near-field | Changed illumination | −1.9 | 6.0 |
| Circular ⊘85 μm | Yes | No | Near-field | Moved fiber | −2.1 | 5.9 |
| Circular ⊘85 μm | Yes | No | Far-field | Changed illumination | −1.6 | 6.1 |
| Circular ⊘85 μm | Yes | No | Far-field | Moved fiber | −1.7 | 6.0 |
| Circular ⊘50 μm | No | No | Near-field | Changed illumination | −1.5 | 6.0 |
| Circular ⊘50 μm | No | No | Near-field | Moved fiber | −2.0 | 5.8 |
| Circular ⊘50 μm | No | No | Far-field | Changed illumination | −1.4 | 6.1 |
| Circular ⊘50 μm | No | No | Far-field | Moved fiber | −1.8 | 5.9 |
| Circular ⊘50 μm | No | Yes | Near-field | Changed illumination | −2.0 | 5.9 |
| Circular ⊘50 μm | No | Yes | Near-field | Moved fiber | −2.3 | 6.0 |
| Circular ⊘50 μm | No | Yes | Far-field | Changed illumination | −1.7 | 5.8 |
| Circular ⊘50 μm | No | Yes | Far-field | Moved fiber | −2.0 | 5.9 |
| Octagonal 67 μm | No | No | Near-field | Changed illumination | −2.1 | 6.1 |
| Octagonal 67 μm | No | No | Near-field | Moved fiber | −2.0 | 5.8 |
| Octagonal 67 μm | No | No | Far-field | Changed illumination | −1.6 | 5.9 |
| Octagonal 67 μm | No | No | Far-field | Moved fiber | −1.5 | 6.0 |
| Octagonal 67 μm | No | Yes | Near-field | Changed illumination | −2.4 | 4.0 |
| Octagonal 67 μm | No | Yes | Near-field | Moved fiber | −2.6 | 4.1 |
| Octagonal 67 μm | No | Yes | Far-field | Changed illumination | −2.4 | 4.0 |
| Octagonal 67 μm | No | Yes | Far-field | Moved fiber | −2.7 | 4.1 |
Notes. Typical scatters within each group of data are ±0.3 for a and ±0.1 for s. See Sect. 4 for details.
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