Intruder alarm arrangement for an optical communication system
Laser power transmitting optical fiber damage detecting device
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Fiber optic sensors for simultaneously detecting different parameters in a single sensing tip
Integrated optical time domain reflectometer/insertion loss measurement system
Optical time-domain reflectometer using heterodyne reception Patent #: 4708471
ApplicationNo. 087366 filed on 08/20/1987
US Classes:250/227.15, With detection of macroscopic break in fiber356/73.1FOR OPTICAL FIBER OR WAVEGUIDE INSPECTION
ExaminersPrimary: Nelms, David C.
Attorney, Agent or Firm
International ClassH01J 005/16
AbstractAn apparatus is disclosed for testing the integrity of an optical fiber (23) from a single end of the fiber. A test light source (34) with a wavelength that is different from the primary light source (14) is directed into one end of the optical fiber (23). A spectrally selective dichroic material (32) is attached to the other end of the optical fiber (23). This material (32) transmits light of the wavelength of the primary light source (14) and reflects light of the wavelength of the test light source (34). A break or discontinuity in the optical fiber (23) can be detected by an attenuation in a pulse of light from the test light source (34) after it is transmitted though the optical fiber (23) and reflected back out of the optical fiber (23) by the dichroic material (32). This system can detect breaks or discontinuities in the optical fiber (23) with a high degree of resolution.