Dynamic Optical Power Measurement of Fiber-Optic Light Transmitter
Original Publication Date: 1987-Aug-01
Included in the Prior Art Database: 2005-Feb-01
Disclosed is a technique to dynamically measure the optical power output of a light emitter over a range of duty-cycles which permits extrapolation to the 100 percent and zero percent values. The circuits used permit changing the duty cycle of operation under digital control making the system easy to automate. Using DC static measurements of light emitters for the zero threshold and full output conditions is not representative of the AC levels which is the actual usage condition. In the present technique, measurements are made for a range of duty-cycle values between 10 to 90 percent. As shown in Fig. 1, a plot of the resulting measurements permits an accurate extrapolation to both the zero and full output conditions.