Schlak, M., Albrecht, P., Heidrich, H., Nolting, H. P., Reier, F.
Polarization transformers are key components for future optical signal processing circuits e.g. in a coherent optical polarization diversity receiver OIC. Here the received TE- and TM-polarization...
Operational conditions for extinction ratio improvement in ultralong SOAs (2009)
Runge, P., Elschner, R., Petermann, K., Schlak, M., Brinker, W., ...
The extinction ratio (ER) improvement in ultralong semiconductor optical amplifiers (UL-SOAs) is studied in dependence on their driving conditions. A stable process potentially useful for simple...
Continuous wave terahertz systems exploiting 1.5 µm telecom technologies (2009)
Sartorius, B., Schlak, M., Stanze, D., Roehle, H., Künzel, H., Schmidt, D., ...
A fiber-assembled CW THz System operating at 1.5 mu m is presented. High speed telecom photodiodes integrated with planar THz antennas serve as THz emitters with power up to 10 mu W. Photoconductive...
All-fiber terahertz time-domain spectrometer operating at 1.5 mu m telecom wavelengths (2008)
Sartorius, B., Roehle, H., Künzel, H., Böttcher, J., Schlak, M., Stanze, D., ...
The worldwide first all-fiber THz time-domain spectrometer for operation at 1.5 mu m is presented. Applications up to 3 THz are demonstrated. Key devices are photoconductive antennas based on novel...
1.5 µm wavelength all-fiber terahertz time-domain spectrometer (2008)
Roehle, H., Sartorius, B., Künzel, H., Böttcher, J., Schlak, M., Stanze, D.
The worldwide first all-fiber THz time-domain spectrometer for operation at 1.5 mu m Is presented. Applications up to 3 THz are demonstrated. Key devices are photoconductive antennas based on novel...
Runge, P., Elschner, R., Petermann, K., Schlak, M., Brinker, W., ...
With the help of the two-wave competition (TWC) in saturated ultra-long semiconductor optical amplifiers (UL-SOAs) the extinction ratio (ER) of high-speed optical signals can be regenerated. We...
Sartorius, B., Bottcher, J., Bornholdt, C., Kunzel, H., Röhle, H., Schlak, M.
A THz system based on fibre connected compact InP-modules is proposed. The hereby missing key device, the photoconductor for coherent THz detection is developed. The functionality is demonstrated in...
Novel concept for all-optical clock recovery from NRZ format PRBS data streams (2006)
Slovak, J., Bornholdt, C., Bauer, S., Kreissl, J., Schlak, M., Sartorius, C.
Synchronization of a self-pulsating phaseCOMB-laser to NRZ data signals is demonstrated for the first time. The clock signal extracted from 40 Gb/s PRBS stream shows a good timing stability in a wide...
Slovak, J., Bornholdt, C., Kreissl, J., Bauer, S., Biletzke, M., Schlak, M., ...
All-optical clock recovery from 40-Gb/s nonreturn-to-zero (NRZ) pseudorandom binary sequence data streams based on self-pulsating lasers is presented. A compact preprocessing circuit is utilized to...
Cascadability and regenerative properties of SOA all-optical DPSK wavelength converters (2006)
Vorreau, P., Marculescu, A., Wang, J., Böttger, G., Sartorius, B., Bornholdt, C., ...
A novel all-optical differential phase-shift keying wavelength converter based on semiconductor optical amplifier nonlinearities is demonstrated in the 25- to 40-Gb/s range with pseudorandom binary...
All-optical DPSK wavelength converter based on MZI with integrated SOAs and phase shifters (2006)
Sartorius, B., Bornholdt, C., Slovak, J., Schlak, M., Schmidt, C., Marculescu, A., ...
An integrated MZI-SOA device is developed for all-optical wavelength conversion of DPSK signals. The functionality is investigated close to 40 Gb/s and error free operation with less then 1 dB...
Optical comb generator using pulse compression in ultra-long semiconductor amplifiers (2005)
Bornholdt, C., Slovak, J., Sartorius, B., Schlak, M., Schmidt, C.
A novel pulse compression technique using an ultra-long semiconductor optical amplifier is presented. High quality 2ps pulses were generated out of 40GHz sinusoidal signal of a PhaseCOMB-laser...
Two-wave competition in ultralong semiconductor optical amplifiers (2005)
Bramann, G., Busolt, U., Schmidt, C., Schlak, M., Sartorius, B., ...
The copropagation of two waves in an ultralong semiconductor optical amplifier (SOA) is considered in theory and experiment. One wave is a modulated signal, whereas the other one is unmodulated...
Semiconductor based true all-optical synchronous modulator for 3R regeneration (2003)
Tekin, T., Bornholdt, C., Slovak, J., Schlak, M., Sartorius, B., Kreissl, J., ...
Tekin, T., Schubert, C., Berger, J., Schlak, M., Maul, B., Brinker, W., ...
Tekin, T., Schubert, C., Berger, J., Schlak, M., Maul, B., Brinker, W., ...
Tekin, T., Schlak, M., Brinker, W., Berger, J., Schubert, C., Maul, B., ...
The all-optical 80 and 160 to 10 Gbit/s demultiplexing performance of this new switching concept have been demonstrated. The key components of this interferometric switch are the band gap shifted...
Ehlers, H., Schlak, M., Fischer, U.H.P.
We designed and fabricated multi-fiber modules for arrayed waveguide-fed InP-OEICs like monolithically integrated MZIs. The light output is collected with high efficiency into tapered SMF arrays...
All-optical demultiplexing performance of monolithically integrated GS-MZI module (2001)
Tekin, T., Ehlers, H., Schlak, M., Berger, J., Schubert, C., Maul, B., ...
Tekin, T., Schlak, M., Brinker, W., Berger, J., Schubert, C., Maul, B., ...
Tekin, T., Schlak, M., Brinker, W., Maul, B., Molt, R.
The all-optical switch has been one of the most investigated components in OTDM communication networks. Monolithically integrated semiconductor optical amplifier (SOA) based interferometric devices...
Tunable TE/TM-mode converter on (001)-InP-substrate (1991)
Schlak, M., Weinert, C.M., Albrecht, P.
The use of a two-dimensional finite difference simulation technique to determine optimal design parameters for the fabrication of TE/TM-mode converters on (001) InP substrate is discussed. Based on...
Polarization converter and splitter for a coherent receiver optical network on InP (1990)
Albrecht, P., Hamacher, M., Heidrich, H., Hoffmann, D., Schlak, M., ...
The key elements of a coherent optical receiver network using a polarization diversity scheme are summarized. The principles of operation and design of the elements for monolithic integration of the...
Tunable TE/TM-mode convertor on (001)-InP-substrate (1990)
Schlak, M., Weinert, C.M., Albrecht, P., Nolting, H.P.
A TE/TM-mode converter for an operating wavelength of 1.56 mu m has been fabricated on (001)-InP substrate. Polarisation conversion of 45 degrees suitable for operation in a polarisation diversity...
The development of a polarization-diversity heterodyne receiver-waveguide switch on InP (1990)
Albrecht, P., Hamacher, M., Heidrich, H., Hoffmann, D., Nolting, H.P., Schlak, M., ...
After a brief discussion of the problem of providing terminal equipment fully to utilize the transmission capacity of the single-mode optical fibre, the article shows the proposed architecture of an...
Thermal degradation effects in InP (1988)
Sartorius, B., Schlak, M., Rosenzweig, M., Parschke, K.
Thermal degradation in InP has been regarded to be equivalent to surface deformation. By means of luminescence microscopy the authors discovered a much larger scale of degradation effects....
Pfanner, K., Franke, D., Sartorius, B., Schlak, M.
The use of a Sn-In-P melt and of InP cover wafers of different orientations to prevent thermal surface decomposition of InP substrates in liquid phase epitaxy has been compared. An almost equivalent...
Heidrich, H., Hoffmann, D., Schlak, M., Albrecht, P.
The theory, architecture and design of monolithically integrated optical polarization transformer with reset-free optical operation and tunable center wavelength is presented.
Luminescence microscopy for quality control of material and processing (1987)
Satorius, B., Franke, D., Schlak, M.
A photoluminescence topography system is devised on the basis of an optical IR microscope. The system offers full versatility and simple operation of the microscope combined with the high sensitivity...
Electro-optic modulators in GaInAsP/InP (1986)
Krauser, J., Albrecht, P., Bornholdt, C., Doldissen, W., Niggebrugge, U., ...
The semiconductor material system InGaAsP on InP is being increasingly used for waveguide based electro-optic devices such as phase modulators, directional coupler modulators, and switches with the...
Integrated-optic polarisation convertor on (001)-InP substrate (1986)
Schlak, M., Nolting, H.P., Albrecht, P., Doldissen, W., Franke, D., Niggebrugge, U., ...
A novel TE/TM convertor is proposed and demonstrated which is fabricated on (001)-InP substrate and can be integrated with TE-TM phase shifters to provide a general polarisation transformation. Some...
Nolting, H.P., Krauser, J., Albrecht, P., Bornholdt, C., Kaumanns, R., Schlak, M.
DE 3337492 A UPAB: 19930925 Device, with a light wave guiding layer of orientation in the propagation direction of the guided light wave which leads to addn. of the Pockels and Kerr effects, has a...
Light guiding and electrooptical modulation in InGaAsP/InP double heterostructures (1983)
Albrecht, P., Bach, H.G., Bornholdt, C., Doldissen, W., Franke, D., Grote, N., ...
The fabrication of long rig-waveguides in the InGaAsP system with low loss suitable for integrated optics has been demonstrated. Furthermore, the authors showed, for the first time, electrooptical...
Passive optical GaInAsP/InP waveguides (1983)
Bornholdt, C., Doldissen, W., Franke, D., Grote, N., Krauser, J., Niggebrugge, U., ...
The authors have fabricated GaInAsP/InP rib waveguides with lengths of up to 7 mm and widths between 2*5 and 10 mu m. The waveguides show low losses of alpha =1.38-1.84 cm-1 at a wavelength of 1.3 mu...