Patent ID: 6046797
Filing Date: 2000-04-04
Classification: G01M

Abstract:
An optical time domain reflectometer comprising:means for generating three different wavelengths (.lambda..sub.1, .lambda..sub.1 +.DELTA..lambda., .lambda..sub.1 -.DELTA..lambda.);means for alternating between one of the wavelengths (.lambda..sub.1) and the other two wavelengths (.lambda..sub.1 +.DELTA..lambda., .lambda..sub.1 -.DELTA..lambda.) in response to a pulse generator signal from a signal generator, for providing a test signal for transmission on an optical fiber transmission cable; andmeans for heterodyning the test signal after reflecting from the optical transmission cable with one of the three different wavelengths (.lambda..sub.1, .lambda..sub.1 +.DELTA..lambda., .lambda..sub.1 -.DELTA..lambda.).