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AFBR-5972Z Datasheet(PDF) 3 Page - AVAGO TECHNOLOGIES LIMITED |
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AFBR-5972Z Datasheet(HTML) 3 Page - AVAGO TECHNOLOGIES LIMITED |
3 / 4 page 3 3. Electro-Optical Test Configuration The two basic test configurations for evaluating the AFBR- 5972Z module are shown in Figure 4 (transmitter) and Figure 5 (receiver). The transceiver module can be char- acterized for optical/electrical characteristics such as eye diagram, rise and fall time, jitter, and current consump- tion. Low loss and matched equal length RF cables should be used to connect the TD+/- and RD+/- signals to the test equipment. The current consumption measurement is for the whole transceiver, transmitter and receiver. Transmitter Measurement Configuration Figure 4 shows the transmitter measurement configura- tion. The transmitter characteristics can be tested for light optical power (LOP), rise and fall time, and jitter perfor- mance, including the eye diagram measurement. In this configuration, the receiver section is not used; however, it is recommended that RD+ and RD- be terminated with 50 Ω matched loads. It is also recommended that a low loss and equal length RF cable can be used to connect TD+ and TD- to the test equipment. Figure 4. Transmitter measurement setup configuration Figure 5. Receiver measurement setup configuration Receiver Configuration Figure 5 shows the receiver measurement configuration. The 1 m POF cable, which is provided with the evalua- tion kit, is used to obtain a transmission link between transmitter and receiver. The gray simplex connector is connected to the transmitter, and the blue simplex connector is connected to the receiver. The receiver char- acteristics can be tested for current consumption, rise and fall time, and jitter performance, including an eye diagram measurement. Results The measurements are carried out using the configura- tion shown in Figure 4 and Figure 5. The pattern generator is set to a PRBS 27-1 pattern and data rate of 125 Mbit/s with LVDS compatible differential signals. The transmitter light optical power (LOP), measured with an optical power meter (OPM) at 650 nm, was -5.57 dBm with a current con- sumption of 78 mA @ 3.3 V supply voltage. Figure 6 shows the transmitter eye diagram after the optical-to-electrical converter block. Figure 7 shows the receiver eye diagram measured with the differential probe at DP, as shown in Figure 3(a). The current consumption is 79 mA. The SD voltage is 1.63 V with no optical input and 2.33 V with an optical signal. |
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