Thomas Josef Jung

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Directly modulated fiber-optic links offers significant advantages in system cost and complexity. However, they often suffer from high link loss and inferior RF performance compared with externally modulated links. In this paper, we have experimentally investigated tbe amplitude modulation (AM) elfieiency, modulation bandwidth, and the nonlinear distortions(More)
—A coherent optical RF channelizer has been constructed and characterized. The optical channelizer is based on a free-space optical diffraction grating, and utilizes coherent optical heterodyne detection to translate all of the frequency channels to a common intermediate frequency (IF). The designed optical channelizer has a 1-GHz channel spacing, and a(More)
—We report on a novel monolithic distributed traveling wave photodetector with parallel optical feed to an array of individual photodiodes using an integrated multimode interference (MMI) coupler to attain high saturation current. The parallel optical feed reduces the maximum photocurrent and photocurrent density seen by any single photodiode, thus(More)
Simulation in the context of engineering often focuses on very special details of global systems. Robot designers usually begin with the analysis of new actuators and joint designs. This corresponds to a “bottom-up”-strategy in the development of simulation models. For classical fields of application of robotics, e.g. in production plants with(More)
The base attitude of a free floating space robot may change while performing a motion with its manipulator. This dynamic coupling complicates the motion planning of the space robot and must be taken into account in order to reach a target point with a desired end-effector pose. However, the free floating mode is useful, because of its energy efficiency, and(More)
—CW injection locking of mode-locked semiconductor lasers has been experimentally demonstrated. The phases of the mode-locked frequency comb are shown to be coherent with that of the master CW laser. The pulsewidth of the mode-locked laser remains almost unchanged (<2 ps) for a broad range of injection power (028 to 012 dBm). Pulling of the entire(More)
A simplified monolithic optical injection locking system using a two section DFB laser is demonstrated. The operating wavelength of the two sections is current tuned to acheve optical injection locking; when locked the modulation bandwidth is increased from lOGHz to 23 GHz. Summary Strong optical injection locking has been demonstrated to improve the(More)