4-10 OLP-5, OLP-6, OLP-8
Using different modulation frequencies, you can
detect a particular fiber in a fiber bundle. We
recommend one of the following sources as your
test stimulus.
Table 4-2 Suitable power sources
Modulation detection at low levels
At very low input levels, it is sometimes
impossible to identify the modulation signal as it
becomes unclear or falls into the noise. In this
case, no modulation frequency is displayed. Two
hyphens appear instead.
Fig. 4-9 Modulation frequency field for very low levels
The limits for reliable modulation frequency
detection depends on the wavelength. They are
specified in Sec. 6.1, Sec. 6.2 and Sec. 6.3.
Fiber type Source Modulation frequencies
Single-mode OLS-6 270 Hz, 1 kHz, 2 kHz
Multi-mode OLS-5 1 kHz, 2 kHz
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