114 – Operating and Maintenance Instructions
Verifying Power Calibration
The insertion losses of two detector channels, under identical measurement conditions and
using the same device, are normally identical. If the insertion losses are not the same, power
calibration of the suspect channel must be verified.
The following equipment is required for verifying and calibrating power:
• Second laser source (does not need to be tunable)
• NIST traceable power meter with monitor output
• JDS Uniphase HA9 Series Extended Range Programmable Optical Attenuator, with two
outputs
• Wavelength meter (optional)
To verify power calibration:
1. Set up the equipment as shown in the following figure. The example shown uses Channel 2
of the receiver. The polarization controller is not used when verifying power calibration.
Figure 94: Power Calibration Setup
2. Use the wave meter to set the wavelength of the second laser source to 1550 nm.
3. Set the power on the second laser source to 0 dBm.
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