5. (Optional) Press the button for keeping the current measurement value unchanged.
6. Read the measurement value.
4.3.2 Optical Power Meter
This topic describes the appearance, functions, and usage instructions of the optical power meter.
The optical power meter is a necessary test meter for testing an optical fiber communication
system. It is mainly used to measure the optical power of various wavelengths at multiple
measurement points of an optical link. Optical power indicates the energy of the light at a
measurement point of an optical link and is an important index of the optical fiber network.
When the optical power is smaller than a specified value, the optical receive end will fail to
detect optical signals. In other words, the optical receive end cannot receive the signals sent from
the transmit end. Hence, it is important to use the optical power meter correctly.
The following considers EXFO's PPM-350B optical power meter as an example to describe how
to use an optical power meter. (Other dedicated optical power meters for PON are used in a
similar way.)
The PPM-350B optical power meter can measure the optical power of various wavelengths,
including 1310 nm, 1490 nm, and 1550 nm in the GPON network. Figure 4-2 shows the
appearance of the PPM-350B optical power meter.
Figure 4-2 Appearance of the PPM-350B optical power meter
As shown in Figure 4-2, the PPM-350B optical power meter is different from common optical
power meters. Specifically, the PPM-350B has a downstream input optical port and an upstream
EchoLife HG8010/HG8110/HG8240/HG8245/HG8247/
HG8447 GPON Terminal
Service Manual 4 Maintenance and Troubleshooting
Issue 02 (2011-12-08) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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