G - Physics – 01 – M
Patent
G - Physics
01
M
G01M 11/02 (2006.01) G01D 5/353 (2006.01)
Patent
CA 2130307
Non-linear, Real-time, Micrometer Resolution Optical Time Domain Reflectometers for Optoelectronic Circuits Diagnostic and Sensing Applications Abstract of the Disclosure By using a non-linear guided wave optical time domain reflectometry (OTDR) technique, specific features of an optoelectronic integrated device may be probed by detecting the reflections and back-scattering of a short light pulse along a waveguide interconnect. An integrated optical correlator in the form of a second harmonic generation (SHG) waveguide and a photodetector array provides a means for detection and measurement of ultra-short pulses for optical ranging, Used with a standard CCD camera, the direct images of the autocorrelation of compressed Nd-Yag pulses (FWHM of 5 ps) have been monitored at video rates. Used with a cooled CCD camera for OTDR, reflections from samples have been observed with an interfeature resolution of about 0.15 mm in GaAs, limited by the FWHM of the laser pulses. Appropriate signal processing can increase the positioning resolution to the better than 50µm. Additional applications are demonstrated, including the monitoring of fibers lengths (to within 30µm in real time) and temperature sensing.
Beaulieu Yves
Chatenoud Francoise
Garside Brian
Normandin Richard
Van Der Meer P.
Anderson J. Wayne
Beaulieu Yves
Chatenoud Francoise
Garside Brian
Normandin Richard
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