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Measuring the Wavelength of Noisy Sources Using the OMM-6810B Optical Multimeter

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Measuring the Wavelength of Noisy Sources Using the OMM-6810B Optical Multimeter

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This Technical Note presents the experimental results showing the effect of source noise on wavelength measurements using the new and improved OMM-6810B Optical Multimeter.The measurement setup is shown in Figure 1. A GPIB controlled function generator was coupled to an Electrical WaveHead Emulator to emulate a noisy light source. This emulator, which is coupled to the GPIB controlled OMM-6810B, performs similarly the optical heads which measure wavelength. The function generator was set up to provide a DC signal that is modulated with a sine wave. The depth of modulation was set at 50%, 25% and 10%. For each of these settings, the computer took 100 wavelength readings over a 20 second period. The maximum change in the wavelength reading was determined and recorded for this period.

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