Determination of a physical state of an optical device
First Claim
1. A method of determining a physical state of an optical device with the steps of:
- coupling a first optical signal to the optical device, wherein a first optical property of said first optical signal is varied according to a first function over the time,measuring a second optical property over the time of a first response signal returning from the optical device in response to the first optical signal and establishing a first result function of said second optical property in dependence of the first optical property of the first optical signal,coupling a second optical signal to the optical device, wherein the first optical property of said second optical signal is varied according to a second function of the time that is different from the first function over the time,measuring the second optical property over the time of a second response signal returning from the optical device in response to the second optical signal and establishing a second result function of said second optical property in dependence of the first optical property of the second optical signal, anddetermining the physical state based on a combination of the first and the second result functions,wherein a combination of the first and the second result functions is performed by determining a first center value of at least a part of the first function and a second center value of at least a part of the second function and determining a resulting center value in dependence of said first and second center values.
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Abstract
The present invention relates to a determination of a physical state of an optical device by measuring a response signal.
At least two subsequent measurements are executed. Therefore, a first optical signal is transmitted to the optical device, wherein a first optical property of said first signal is varied according to a first function of the time. A second optical property of a first response signal returning from the optical device is measured over the time and a first result function of the second optical property of the first response signal over the first optical property of first optical signal is established. Further, a second optical signal is transmitted to the optical device, wherein the first optical property of said signal is varied according to a second function of the time that is different from the first function of time. The second optical property of the corresponding second response signal is measured and a second result function of the second optical property of the response signal over the first optical property of the transmitted optical signal is established. The physical state of the optical device is determined on the base of a combination of the first and second result functions.
8 Citations
15 Claims
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1. A method of determining a physical state of an optical device with the steps of:
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coupling a first optical signal to the optical device, wherein a first optical property of said first optical signal is varied according to a first function over the time, measuring a second optical property over the time of a first response signal returning from the optical device in response to the first optical signal and establishing a first result function of said second optical property in dependence of the first optical property of the first optical signal, coupling a second optical signal to the optical device, wherein the first optical property of said second optical signal is varied according to a second function of the time that is different from the first function over the time, measuring the second optical property over the time of a second response signal returning from the optical device in response to the second optical signal and establishing a second result function of said second optical property in dependence of the first optical property of the second optical signal, and determining the physical state based on a combination of the first and the second result functions, wherein a combination of the first and the second result functions is performed by determining a first center value of at least a part of the first function and a second center value of at least a part of the second function and determining a resulting center value in dependence of said first and second center values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A evaluation unit for determining a physical state of an optical device, comprising
a first input for receiving first optical property information about each of a first and a second optical signal coupled to a optical device, a second input for receiving second optical property information about each of a correspondingly first and a second returned optical signals from the optical device, a processing unit for relating the first optical property information and the second optical property information to each other into a result function for each of the optical signals, and determining a resulting center value based on the first and the second result functions.
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14. A measurement setup for determining a physical state of an optical device, comprising:
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a tunable light source for emitting a first optical signal and a second optical signal, each having an optical property variation over the time, an optical device for receiving said first optical signal and said second optical signal, and returning corresponding first and second response signals, an optical detector for determining optical power of the first and second response signals, optical guides for optically connecting each of the tunable light source and the optical detector to the optical device, and an evaluation unit having; a first input for receiving first optical property information about each of said first and second optical signals, a second input for receiving second optical property information about each of said first and a second response signals, and a processing unit for relating the first optical property information and the second optical property information to each other into a result function for each of the optical signals, and determining a resulting center value based on the first and the second result functions wherein said evaluation unit is connected to the tunable light source for receiving the first optical property information, and to the optical detector for receiving the second optical property information.
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15. A software program or product stored on a data carrier, for executing in an evaluation unit the following steps, when run on a data processing system such as a computer:
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receiving first information about a first optical property of at least two emitted optical signals, receiving second information about a second optical property of two detected corresponding signals returned from an optical device, relating the first and the second information to each other into a result function for each of the optical signals, and determining a resulting center value based on the first and the second result functions.
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Specification