Abstract: The present invention relates to an apparatus and to a method of measurement of optical loss of a DUT having a first end and a second end, comprising the steps of: coupling an optical signal into the first end of the DUT, measuring the optical power of the optical signal by a first detector, reflecting the optical signal at the second end of the DUT to send back a reflected optical signal into the DUT, measuring a reflected optical power of the reflected optical signal by a second detector, evaluating a two-way optical loss on the basis of measurements of the first and the second detectors.

Abstract: An optical measuring device for providing a measurement of an optical device under test -DUT- comprises a measuring unit for providing an optical stimulus signal for the DUT and/or receiving a response signal of the DUT, and a visual fault localization unit for visually localizing faults within the DUT or a connection thereto. The measuring unit and the visual fault localization unit are preferably coupled to a signal direction unit, and the signal direction unit is further coupled to a connector representing an interface of the optical measuring device for coupling the DUT thereto.

Abstract: The present invention relates to a method and to an apparatus for measuring an optical property, such as group delay or chromatic dispersion, of a DUT, comprising: a first coupler connected to the DUT for coupling a first optical signal having a first wavelength and a second optical signal having a second wavelength into the DUT, the second wavelength being variable with respect to the first wavelength, a detector connected to the DUT for detecting the first and the second signal leaving the DUT, an evaluation unit connected to the detector, for determining a difference in runtime, if any, between the first and the second signal having traveled at least one time through the DUT and for deriving the optical property from the detected difference.

Abstract: An optical measuring device for providing a measurement of an optical device under test -DUT- comprises a measuring unit for providing an optical stimulus signal for the DUT and/or receiving a response signal of the DUT, and a visual fault localization unit for visually localizing faults within the DUT or a connection thereto. The measuring unit and the visual fault localization unit are preferably coupled to a signal direction unit, and the signal direction unit is further coupled to a connector representing an interface of the optical measuring device for coupling the DUT thereto.

Abstract: The present invention relates to an apparatus and to a method of measurement of optical loss of a DUT having a first end and a second end, comprising the steps of: coupling an optical signal into the first end of the DUT, measuring the optical power of the optical signal by a first detector, reflecting the optical signal at the second end of the DUT to send back a reflected optical signal into the DUT, measuring a reflected optical power of the reflected optical signal by a second detector, evaluating a two-way optical loss on the basis of measurements of the first and the second detectors.

Abstract: The present invention relates to a method and to an apparatus for measuring an optical property, such as group delay or chromatic dispersion, of a DUT, comprising: a first coupler connected to the DUT for coupling a first optical signal having a first wavelength and a second optical signal having a second wavelength into the DUT, the second wavelength being variable with respect to the first wavelength, a detector connected to the DUT for detecting the first and the second signal leaving the DUT, an evaluation unit connected to the detector, for determining a difference in runtime, if any, between the first and the second signal having traveled at least one time through the DUT and for deriving the optical property from the detected difference.

Abstract: A characteristic of an optical property of a device under test—DUT—is determined by providing to the DUT a first laser signal at a first center wavelength, modulated by a first modulation frequency, and a second laser signal at a second center wavelength, modulated by a second modulation frequency. Response signals from the DUT on the applied first and second laser signals are received. The characteristic of the optical property of the DUT is then determined based on an analysis of the received response signals for different measurement setups of parameter settings for the first center wavelength, the first modulation frequency, the second center wavelength, and the second modulation frequency, in conjunction with the parameter settings for each measurement setup.