Polarization independent optical coherence-domain reflectometry

Details Polarization independent optical coherence-domain reflectometry Polarization independent optical coherence-domain reflectometry

1992-03-02

1993-04-13

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

356351, G01B 902, G01N 2184

Patent

active

052027457

ABSTRACT:
An optical coherence-domain reflectometry system provides an interferometer driven by a broadband incoherent light source with the device under test connected to one arm of the interferometer and a movable scanning mirror in the other arm providing a reference signal. The mirror moves at a controlled velocity to produce a Doppler shift in the reference signal frequency. The reference signal arm also includes a piezoelectric transducer which modulates the phase of the reference signal at a given frequency, causing a further shift in the reference signal frequency. The interference signal is detected and measured by a polarization diversity receiver. A linear polarizer in the reference signal arm is adjusted to produce equal reference signal powers in each arm of the polarization diversity receiver in the absence of a reflection signal from the test arm. The measured reflectometry signal is substantially independent of the state of polarization of the reflected signal from the device under test.

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