Browse Prior Art Database

Dynamic Optical Power Measurement of Fiber-Optic Light Transmitter

IP.com Disclosure Number: IPCOM000039888D
Original Publication Date: 1987-Aug-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Aulet, NR: AUTHOR [+3]

Abstract

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.

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Dynamic Optical Power Measurement of Fiber-Optic Light Transmitter

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.

(Image Omitted)

The test system consists of a generator producing suitable power pulses to drive the light emitter under test which is coupled by fiber optics to light power output measuring equipment. The pulse generator has the capability of control of the repetition frequency and duty cycle of the pulse. Fig. 2 illustrates a particular circuit which is convenient for pulse generation because it permits digital control of the duty cycle of the output pulse independently of the pulse repetition frequency. Parallel input signals 1 are translated by the decoding gate circuits 2 to control the duty cycle of the output waveform 4 produced by the serial shift register 3. The shift regis...