Optics: measuring and testing – For optical fiber or waveguide inspection
Reexamination Certificate
2002-03-08
2004-08-03
Nguyen, Tu T. (Department: 2877)
Optics: measuring and testing
For optical fiber or waveguide inspection
Reexamination Certificate
active
06771359
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to fiber connection testing.
Optical fiber connections are generally very susceptible to contamination with dirt and fluids, scratches, dust and so on, which can cause faults, such as increased insertion loss, higher bit error rate, or signal degradation to the fiber connection and the traffic signal on the fiber. A visual inspection of fiber connectors might therefore be applied. Typically, such visual inspection is carried out using an electronic video microscope consisting of camera unit, monitor, and battery pack. Various devices and methods for surface analysis are disclosed e.g. in U.S. Pat. Nos. 5,809,162, 5,179,419, or JP-A-07 218385.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an improved visual inspection for fiber connections. The object is solved by the independent claims. Preferred embodiments are shown by the dependent claims.
According to the present invention, imaging signals as provided from an optical fiber connection will be subject to an image processing in order to detect faults in such fiber connection. Such faults can be e.g. scratches, particles such as dirt, fluid films (such as oil films), etc. In a preferred embodiment, pattern recognition is provided in order to detect such faults.
In a next step, the imaging signals will be graphically represented, e.g. on a display, screen, or monitor, whereby a visualization of the detected faults is provided by representing such faults in accordance with a predefined coloring scheme. Preferably, different faults will be represented in different colors. In one embodiment, the imaging signals are provided as mono-color signals (preferably black and white signals) or at least with a limited color or gray scale information. The detected faults are then represented preferably in such colors that are not existing in the original imaging signals.
Thus, the invention provides an improved visual inspection of fiber connections, whereby faults will be readily visualized using a fault-coloring scheme. Preferably, a false-coloring scheme is applied, so that detected faults will be represented in non-real, arbitrary colors.
It is clear that the term “coloring scheme” is not limited to the application for different optical colors (such as red, yellow, or blue) but also covers mono-color shading e.g. in a black and white representation.
The invention can be partly embodied or supported by one or more suitable software programs, which can be stored on or otherwise provided by any kind of data carrier, and which might be executed in or by any suitable data processing unit. Software is preferably employed for processing the imaging signals.
In a preferred embodiment, an optical measuring device for measuring in fiber optic networks comprises a measuring unit for carrying out the measurement, a processing unit for processing measuring data, and a display for visualizing processed measuring results. The optical measuring device further comprises an imaging unit for providing imaging signals preferably for allowing a visual inspection of fiber connections. The imaging unit is adapted to be coupled to the processing unit, which then allows processing the imaging signals so that they can be shown on the display.
The optical measuring device preferably is (or is based on) an optical time domain reflectometer (OTDR), a WDM-tester, a dispersion tester, an optical power-meter, or another test instrument. In a preferred embodiment, the measuring device makes use of already existing functional units, whereby the imaging unit can be coupled thereto by means of interfaces (such as USB). The processing unit will be specifically adapted for providing the image processing and the visualization of the imaging signals to the display. Such adaptation is preferably accomplished by adequate software programs and algorithms, whereby known imaging processing algorithms can be applied.
Instead of the optical measuring device with imaging unit, a conventional electronic video microscope can be used accordingly.
REFERENCES:
patent: 5179419 (1993-01-01), Palmquist et al.
patent: 5809162 (1998-09-01), Csipkes et al.
patent: 6445452 (2002-09-01), Kondou et al.
patent: 07218385 (1995-08-01), None
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