Optical fiber transfer function measuring system

Details Optical fiber transfer function measuring system Optical fiber transfer function measuring system

G - Physics

01

J

354/139, 73/0.5

G01J 3/28 (2006.01) G01M 11/00 (2006.01) H01S 5/042 (2006.01) H01S 5/0683 (2006.01) H01S 5/0687 (2006.01)

Patent

CA 1126532

ABSTRACT OF THE DISCLOSURE: The transfer modulation measuring system is made up of an adjustable multifrequency generator, a laser emission circuit, an optical detector and a spectrum analyzer. The generator includes oscillators at predetermined frequencies belonging to a discrete frequency distribution. Component signals at selected predetermined frequencies may be time- division multiplexed of frequency-division multiplexed into an electrical composite signal which modulates the laser emission. The system comprises also two optical fiber connectors and a so-called priming optical fiber which excits uniformly the propagation modes at the entrance end of the optical fiber to be measured. During a calibration phase, the connectors are jointed end-to-end and aligned optically. The spectral lines at predetermined frequencies are successively adjusted to a same predetermined level on the screen of the spectrum analyzer by means of potentiometers adjusting the amplitudes of the component signals. These adjustements contribute the transfer function of the optical fiber to be displayed direct- ly on the screen of the spectrum analyzer during the measure- ment phase for which the optical fiber to be measured is connected between the two connectors. The modulated light signal crossing the optical fiber arises from the modulation of the selected time-multiplexed or simultaneously mixed frequencies.

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