Agilent Technologies, Inc.

Peter Thoma

Emmerich Mueller

Ralf Henning Stolte

Tobias Ruf

Bernd Nebendahl

Patrick Ziegler

Harald Rosenfeldt

A laser apparatus for providing a stabilized multi mode laser beam includes an external cavity for providing an optical path for generating a laser beam which is stimulated by a gain medium, where the external cavity has first spectral characteristics, and a mode-selecting filter positioned within the optical path and having second spectral characteristics. The first characteristics and the second characteristics are adjusted to each other, so that the laser beam has at least two selected modes.

External cavity laser with multiple stabilized modes

A method and a measurement setup for determination of optical properties of a device under test in both directions in transmission and in reflection, includes a coding device distinguishably coding at least two parts of a provided measurement signal, feeding elements feeding the at least two parts into the DUT from both directions, receiving elements receiving the signals from both directions transmitted and reflected by the DUT, identifying at least the coded parts in the signals transmitted and reflected by the DUT, and analyzing at least the identified parts to determine at least one optical property of the DUT from both directions in transmission and in reflection.

Determination of optical properties of a device under test in both directions in transmission and in reflection

A laser source includes a laser medium having a back facet and a front surface, whereby the laser medium is adapted to emit a laser beam through the front surface into an external cavity defined in length by a cavity end mirror reflecting the laser beam back towards the laser medium. A wavelength tunable filter is arranged between the laser medium and the cavity end mirror adapted for tuning the wavelength of the laser beam. The laser medium, the wavelength tunable filter, and the cavity end mirror are arranged in a spatially linear cavity structure substantially in a line without angular redirection of the laser beam in the cavity between the laser medium and the cavity end mirror. At least one portion of the laser beam within the cavity after passing the wavelength tunable filter and before again passing the laser medium is coupled out as an output beam of the laser source, and the cavity end mirror is provided to be partly transparent for coupling out a first output beam.

Linear cavity tunable laser

A setup for providing an optical contact adapted for guiding an optical signal comprises an optical waveguide being adapted for guiding the optical signal and comprising a tip on an end of the waveguide, wherein the tip comprises a transparent elastic material covering the end. A detector is provided for detecting a substantial alignment between the waveguide and an optical path within a device under test, and a first moving unit is used to move the waveguide laterally relative to a longitudinal direction of the waveguide and the device under test until the detector substantially detects the alignment. A second moving unit is adapted to reduce the distance between the tip and the device under test until the tip comes in physical contact with the device under test when the detector has detected alignment.

Contacting an optical waveguide to a device under test

An apparatus and a method of determination of at least one optical parameter of an optical signal includes providing a beam of the optical signal having a diameter, manipulating the beam, the manipulation having polarization properties, the properties being dependent of the position in the beam laterally with respect to a direction of propagation of the beam during manipulation, detecting in intensities at least three parts of the beam in their dependence of the position in the beam laterally with respect to a direction of propagation of the beam during detection.

Determination of an optical parameter of an optical signal

An apparatus for processing an insulated fiber includes an optical fiber provided with insulation a retention device, which clamps the insulated fiber placed inside it, and a holder-bracket assembly comprising two holder brackets, between which a projecting section of the insulated fiber is located in a starting position beyond the retention device and is clamped in the retention device, which can be adjusted in relation to each other and perpendicular to fiber and which hold a section of the fiber insulation to be removed in a holding position. A cutting device is provided that cuts into the insulation to be removed perpendicular to the fiber. The retention device and the holder-bracket assembly can be adjusted in relation to each other, parallel to the fiber, during which the fiber is fixed in relation to the retention device, while the cut-off insulation is fixed in relation to the holder-bracket assembly.

Machining an insulated optical fiber

A wavelength-determining unit for determining the wavelengths of a plurality of successive optical signals &lgr;(t) includes a wavemeter unit for determining first wavelength values &lgr;1(t) for the optical signals &lgr;(t). An absolute-measuring unit having unambiguous wavelength properties at known absolute wavelength values determines second wavelength values &lgr;2(t) as such of the known absolute wavelength values covered by the optical signals &lgr;(t). An evaluation unit receives the determined first &lgr;1(t) and second &lgr;2(t) wavelength values and provides forcorrected wavelength values &lgr;1&prime;(t) based on a comparison of the determined first &lgr;1(t) and second &lgr;2(t) wavelength values.

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Rottenburg, Germany

Peter Thoma