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An experimental purpose:
1. Understanding the performance parameters of optical passive components
2. master some test methods of performance parameters
The experimental principle and block diagram
For optical passive devices, insertion loss and split ratio are two commonly used performance parameters, because they are all related to optical power. Therefore, the experimental block diagram shown in Figure 9.1 can be used to connect optical fiber connectors and couplers. Wait for some simple test of performance parameters.
The pattern generator sends a square wave signal to the optical transmitter as a test signal from point A (corresponding to test point TP601 of the experimental platform). At this point, the TP601 point should be able to test the square wave signal. From point R, the measured optical power can be calculated to obtain the performance index to be measured.
Three experimental steps:
1. Build a circuit
(1) Connect the power supply (VCC) and ground (GND) of the digital optical transceiver module (A).
(2) Connect the TK204 and TK601 with the connection cable and set the switch KS601 to the digital light source to drive the strobe state (ie, lift up).
2. Test data
Take out the protective plastic sleeve from the sending end (A) connector S, and insert the optical fiber jumper into the input connector S and the input connector plug of the optical power meter, and connect the light output and optical power meter of the optical transmitting end. The power read by the optical power meter is the average transmit power P of the optical transceiver.
Remove the fiber jumper from the S, R movable connector and connect the passive optical device to be measured (such as the fiber coupler) between the S and R points. Since there are more than one input and output ports for the device, they should be tested separately. The following takes the test of the port shown in Figure 9.2 as an example. The test of other ports is not repeated.
Measuring the optical power, you can calculate the insertion loss of ports 1-3; connect the connector of point R and connect with ports 4 and 2, respectively, to measure the corresponding optical power, and then calculate the split ratio between 3-4, 1-2 between the isolation and other parameters.