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Optical power meters are commonly used to measure absolute light power in dBm, Figure 3.53. For dBm measurement of light transmission power, traceable calibration of fiber-optic power meters is essential. A fiber-optic power meter is also used with an optical light source for measuring relative power levels in dB. Alternatively, some users may prefer an integrated two-way Test Loss Set (TLS), or a simple Loss Test Set (LTS). The Photodyne 2285XQ fiber-optic power meter (Fig. 3.54) is a low-cost optical power meter for general-purpose average-power
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FIGURE 3.53 Hand-held optical power meter.
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FIGURE 3.54 Photodyne 2285XQ ber-optic power meter. (Courtesy 3M Corporation)
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measurement, but particularly for fiber-optic applications, in both manual and computer-controlled test setups. A unique and powerful feature of the 2285XSQ is its ratio function. This allows the user to make ratio (A/B) measurements by stacking several instruments together via the interface without the need for a controller. Another very powerful feature is the built-in data logger. With this function, data may be taken at intervals from 1 to 9999 s. This feature is useful in testing optical devices for short- and long-term operation. At the heart of the instrument is a built-in large-area highsensitivity indium gallium arsenide (InGaAs) sensor. All industry connectors may be interfaced to the sensor using any of the Photodyne series 2000 connector adapters. The sensor is calibrated for the all the fiber-optic windows: 820, 850, 1300, and 1550 nm.
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The Photodyne 2260XF and 2260XFA are switchable dual laser test sets, with a transmit and receive section in one unit. They measure and display loss in fiber links at both 1300 and 1550 nm simultaneously in one pass. They are designed for use in installing, maintaining, and troubleshooting single-mode wavelength-division multiplexed (WDM) fiber-optic links operating at 1300- and 1550-nm wavelengths. They may also be used for conventional links operating at either 1300 or 1550 nm. The essential differences between the two models are that the XF version (Fig. 3.55) has a full complement of measurement units, log and linear (dBm, dB, mW, W, nW), whereas the XFA version has log units only (dBm, dB). In the XF version, laser power output is
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FIGURE 3.55 Photodyne 2260XF switchable dual laser test set. (Courtesy 3M Corporation)
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adjustable over the range 10 to 20 dBm (100 W to 21 mW). In the XFA version, it is automatically set to a fixed value of 10 dBm. The XF version allows the user to access wavelengths over the ranges 1250 to 1350 nm and 1500 to 1600 nm in 10-nm steps. The XFA version is fixed at 1300 nm to 1550 nm. To control all functions, the XF version has six keys; the XFA has only two. Although both instruments perform identical tasks equally well, the XF may be seen as the more flexible version, and the XFA as the simpler-to-use version.
3.17.1 Test Sets/Talk Sets
The handheld Photodyne 21XTL fiber-optic test set/talk set (Fig. 3.56) is for use in installation and maintenance of fiber cables. This instrument functions as a power meter and test set, as well as a talk set. For maintenance purposes, the user may establish voice communication over the same fiber pair being measured. The 21XTL, as a power meter, covers an exceptionally wide dynamic range ( 80 to +3 dBm). As an option, the receiver may include a silicon or an enhanced InGaAs photodiode. With the InGaAs version, the user can perform measurements and voice communication at short and long wavelengths. The silicon version achieves a superior dynamic range at short wavelengths only. The highly stabilized LED ensures repeatable and accurate measurements. Precision optics couples the surface-emitter LED to the fiber core. With this technique, the fiber end will not wear out or scratch. The transmitter is interchangeable, providing complete flexibility of wavelengths and connector types.
FIGURE 3.56 Photodyne 21XTL ber-optic test set/talk set. (Courtesy 3M Corporation)
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