Hewlett-packard Company

Peter Thoma

Peter Hoffmann

Alf Clement

Josef Beller

Robert Jahn

Juergen Sang

In an optical time domain reflectometer for the measurement in optical networks with currently applied traffic signals a switchable filter device Is positioned before a detector unit for the measurement of the reflected optical signals caused by an optical measurement section. The filter device includes an optical path into which one or more optical filters can be inserted reversibly, e.g. by an actuator. Communication signals present on the measurement section are attenuated by the filter(s) and the detector unit is able to detect the reflected signals undisturbed by the communication signals.

Optical time domain reflectometer for measurements in optical networks

Disclosed is a system for determining wavelength dependent information, preferably event loss, reflectance, center wavelength, cross talk, directivity, and/or isolation, about an optical component in an optical structure. The system includes at least one light emitting source for providing light signals at a plurality of different wavelengths to an optical link which is in an optical connection with the optical component, a measuring unit for measuring a backscattered and/or reflected signal versus time returning from the optical structure, and a processing unit for determining the wavelength dependent information about the optical component by processing the measured signal versus time as measured for a plurality of light signals at different wavelengths. A particularly advantageous application of the invention is to determine the wavelength dependent spatial structure of an optical network. In that case, the wavelength dependent information is associated with spatial information representing spatial properties of the optical component.

Remote measurement of wavelength dependent information about optical

An instrument is described for the measurement of optical and/or electrical signals, such as an optical time domain reflectometer (OTDR) or an electrical time domain reflectometer (TDR). The instrument includes a display to depict a waveform representative of measured signals, and can be operated by a few buttons, namely a start/stop button, a cursor-key and a select/confirmation-key. After adjustment of display parameters, almost the entire display is available for display of measured signals and data.

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Rottenberg, Germany

Peter Thoma