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US 7,110,119 B2Granted
Determining an optical property by using superimposed delayed signals
AssigneeAgilent Technologies, Inc.
InventorRuediger Maestle
Life of this patent
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Abstract
An optical property of a device under test is determined from a detected DUT response signal, or a signal derived therefrom, whereby the DUT response signal represents a signal response of the DUT in response to a composite signal or a signal derived from said composite signal. The composite signal comprises superimposed signals delayed with respect to each other.
Claims19
An apparatus for determining an optical property of a device under test—DUT—, comprising:
- a delay unit for providing a composite signal comprising superimposed signals delayed with respect to each other and that interfere with each other;
- and
- a first determination unit for determining the optical property of the DUT from a detected DUT response signal, or a signal derived therefrom, wherein the DUT response signal represents a signal response of the DUT in response to the composite signal or a signal derived therefrom,
- wherein the delay unit derives the superimposed signals from an incident optical signal, and
- wherein said incident optical signal is swept in frequency with a predefined sweep speed over a frequency tuning range.
2 more elements
An apparatus for determining an optical property of a device under test—DUT—, comprising:
- a delay unit for providing a composite signal comprising superimposed signals delayed with respect to each other and that interfere with each other;
- and
- a first determination unit for determining the optical property of the DUT from a detected DUT response signal, or a signal derived therefrom, wherein the DUT response signal represents a signal response of the DUT in response to the composite signal or a signal derived therefrom,
- wherein a frequency separation Δf between said delayed signals is varied by varying a sweep speed for sweeping the incident optical signal in frequency.
1 more element
An apparatus for determining an optical property of a device under test—DUT—, comprising:
- a delay unit for providing a composite signal comprising superimposed signals delayed with respect to each other and that interfere with each other;
- and
- a first determination unit for determining the optical property of the DUT from a detected DUT response signal, or a signal derived therefrom, wherein the DUT response signal represents a signal response of the DUT in response to the composite signal or a signal derived therefrom,
- wherein a first interference pattern is detected for a first frequency separation Δf1 between said delayed signals, and wherein a second interference pattern is detected for a second frequency separation Δf2 between said delayed signals.
1 more element
An apparatus for determining an optical property of a device under test—DUT—, comprising:
- a delay unit for providing a composite signal comprising superimposed signals delayed with respect to each other and that interfere with each other;
- and
- a first determination unit for determining the optical property of the DUT from a detected DUT response signal, or a signal derived therefrom, wherein the DUT response signal represents a signal response of the DUT in response to the composite signal or a signal derived therefrom,
- wherein a frequency separation Δf between said delayed signals is determined by analyzing a reference interference pattern of said composite signal, or of a signal derived therefrom.
1 more element
An apparatus for determining an optical property of a device under test—DUT—, comprising:
- a delay unit for providing a composite signal comprising superimposed signals delayed with respect to each other and that interfere with each other;
- a first determination unit for determining the optical property of the DUT from a detected DUT response signal, or a signal derived therefrom, wherein the DUT response signal represents a signal response of the DUT in response to the composite signal or a signal derived therefrom;
- and
- an optical modulator for modulating said composite signal, or said DUT response signal, or a signal derived from said signals, with an external frequency.
1 more element
A method for determining an optical property of a device under test—DUT—, comprising:
- providing a composite signal by superimposing signals delayed with respect to each other so that they interfere with each other;
- detecting a DUT response signal, wherein the DUT response signal represents a signal response of the DUT in response to the composite signal or a signal derived therefrom;
- determining the optical property of the DUT from the detected DUT response signal or a signal derived therefrom;
- splitting an incident signal into at least two optical signals comprising a first optical signal and a second optical signal;
- and
- individually delaying said optical signals via at least two different light paths in order to obtain said delayed signals.
3 more elements
A method for determining an optical property of a device under test—DUT—, comprising:
- providing a composite signal by superimposing signals delayed with respect to each other so that they interfere with each other;
- detecting a DUT response signal, wherein the DUT response signal represents a signal response of the DUT in response to the composite signal or a signal derived therefrom;
- determining the optical property of the DUT from the detected DUT response signal or a signal derived therefrom;
- and
- sweeping the frequency of an incident signal over a frequency tuning range.
2 more elements
A method for determining an optical property of a device under test—DUT—, comprising:
- providing a composite signal by superimposing signals delayed with respect to each other so that they interfere with each other;
- detecting a DUT response signal, wherein the DUT response signal represents a signal response of the DUT in response to the composite signal or a signal derived therefrom;
- determining the optical property of the DUT from the detected DUT response signal or a signal derived therefrom;
- and
- repeating at least once the measurement with a different state of polarization of the superimposed signal.
2 more elements
Dependencies are inferred from the claim text.