Vectorial Simulation of Passive Mode Converter Devices on InP, (9999)
First passive TE/TM-mode converters on InP have been published recently using InP/GaInAsP(lambda sub Q = 1.3 micrometer) rib waveguides periodically and asymmetrically loaded with a lambda sub Q =...
C-band optical 90°-hybrids based on silicon-on-insulator 4×4 waveguide couplers (2009)
Zimmermann, L., Voigt, K., Winzer, G., Petermann, K., Weinert, C.M.
We demonstrate 4×4 multimode interference couplers in a silicon-on-insulator rib waveguide technology that enable compact integrated fully passive optical 90°-hybrid devices with operation across...
Kunkel, R., Hoffmann, D., Weinert, C.M., Molina-Fernandez, I., Halir, R.
A monolithically integrated InP 90° hybrid incorporating waveguide balanced photodiodes is presented. Stable performance is achieved over a wavelength range from 1530 nm to 1565 nm.
Silicon-on-insulator 90º optical hybrid using 4x4 waveguide couplers with C-band operation (2008)
Voigt, K., Zimmermann, L., Winzer, G., Petermann, K., Weinert, C.M.
DE1005021829 B UPAB: 20060612 NOVELTY - A purely optical wavelength converter, to convert an optical data signal from one carrier wavelength ( Delta 1) to another carrier wavelength ( Delta 2), has...
Amplitude histograms which have simultaneously deterministic perturbations and Gaussian noise are analysed by a Gaussian deconvolution method. It enables the identification of the deterministic...
Verfahren und Einrichtung zur Pulsformung in transparenten optischen Netzen (2003)
DE 10212576 A UPAB: 20031128 NOVELTY - Pulses (I1-In) of an RZ signal (1) to be re-shaped, having similar mean power, are coupled out of the transmission path. They are amplified (2) to a mean pulse...
Integriert-optischer Feldweitentransformator zur adiabatischen, monomodigen Feldanpassung (2002)
DE 10123137 C UPAB: 20021118 NOVELTY - The integrated optical field width transformer (1) has an optical component provided by a photonic crystal acting as an artificial grid with periodic structures...
Impact of fiber chromatic dispersion in high-speed TDM transmission-systems (2002)
Konrad, B., Petermann, K., Berger, J., Ludwig, R., Weinert, C.M., Weber, H.G., ...
General guidelines for high-speed data rate transmission are essential for the increase of the overall transmission capacity. In this paper general theoretical investigations and experiments...
Nonlinear optical intensity filters: Experiment and design rules (2001)
Weinert, C.M., Sizmann, A., Ludwig, R., Schubert, C., Feiste, U., Weber, H.G.
A noise regeneration experiment with a highly asymmetric nonlinear optical loop mirror (NOLM) is compared with numerical calculations. For different fiber types, NOLM design rules for noise reduction...
Ludwig, R., Sizmann, A., Feiste, U., Schubert, C., Kroh, M., Weinert, C.M., ...
We report on the application of a highly asymmetric nonlinear optical loop mirror (NOLM) for noise reduction and improvement of the system performance in 10-40 Gbit/s transmission experiments. The...
Optical TDM-transmission systems for channel rates of 40 Gbit/s and above (2001)
Berger, J., Breuer, D., Feiste, U., Konrad, B., Ludwig, R., Petermann, K., ...
Since optical transmission systems with channel rates of 40 Gbit/s per WDM channel are already close to field introduction, there is considerable interest in possible transmission systems with even...
High bit rate OTDM-transmission on standard fibre (2001)
Weinert, C.M., Berger, J., Feiste, U., Hilliger, E., Konrad, B., Kroh, M., ...
We describe experimental and numerical studies on high bit rate, single span transmission system over a length of 160 km without amplifiers in the link (unrepeatered). From these studies we revealed...
Application of asynchronous amplitude histograms for performance monitoring of RZ signals (2001)
Weinert, C.M., Schmidt, C., Weber, H.G.
It is shown that error evaluation from asynchronously sampled RZ amplitude histograms is possible for Gaussian noise irrespective of the duty cycle. Non-Gaussian perturbations such as timing jitter...
Histogram method for performance monitoring of the optical channel (2000)
A new histogram method is proposed which can be used for identification of crosstalk and dispersion. It is based on a deconvolution method. Measured histograms for signals with inband crosstalk are...
Histogram method for identification and evaluation of crosstalk (2000)
Weinert, C.M., Caspar, C., Konitzer, M., Rohde, M.
Signal performance monitoring by a novel histogram method is proposed for identification crosstalk, it is based on a deconvolution method. Measured histograms for signals with inband crosstalk are...
BER evaluation for optical signals with combined EDFA and interference noise (2000)
We investigate the effects of combined interference noise and Gaussian noise on the BER evaluation. For the case of one interference source and additional Gaussian noise we propose a method to...
Influence of cascaded crosstalk sources on transparency length (2000)
Caspar, C., Konitzer, M., Schmidt, E., Schulze, E., Strebel, B., Weinert, C.M.
The influence of cascaded optical cross connects including crosstalk on the transparency length is measured with a new double-path loop setup. In addition, numerical simulations were performed to...
Histogram method for identification and evaluation of crosstalk (2000)
Weinert, C.M., Caspar, C., Konitzer, M., Rohde, M.
Signal performance monitoring by a new histogram method is proposed for the identification of crosstalk. It is based on a deconvolution method. An investigation into the measured histograms for...
High-speed transmission over standard fiber (1999)
Weber, H.G., Breuer, D., Feiste, U., Koltchanov, I., Ludwig, R., Weinert, C.M.
We report on experimental and theoretical results of data transmission over standard fiber (D=6 ps/lon/nm) for terrestrial applications using WDM-technique with channel data rates of 40 Gbit/s and...
40 Gb/s and 4*40 Gb/s TDM/WDM standard fiber transmission (1999)
Weinert, C.M., Ludwig, R., Pieper, W., Weber, H.G., Breuer, D., Petermann, K., ...
We investigate the possibilities of 40 and 4*40 Gb/s time division multiplexing wavelength division multiplexing (TDM/WDM) return-to-zero (RZ) transmission over embedded standard single-mode fibers...
Weinert, C.M., Molle, L., Caspar, C., Strebel, B.
An optoelectronic transponder can be used as an optoelectronic 2R-repeater including wavelength-division-multiplexed frequency converting facilities. Measurements and black-box modeling of the...
Freund, R., Caspar, C., Hanik, N., Reimer, W., Strebel, B., ...
We present a CAD realization for the physical layer of photonic networks based on a programming environment for complex development and simulation tasks. Verification of the numerical methods by...
4-channel*40-Gb/s unrepeatered OTDM transmission over 100-km standard fiber (1998)
Pieper, W., Ludwig, R., Weinert, C.M., Kuhlow, B., Przyrembel, G., Ferstl, M., ...
Four wavelength-division-multiplexing (WDM) channels, each carrying a 40-Gb/s optical time-division multiplexing (OTDM) data signal, are transmitted over 100-km standard fiber (nondispersion shifted...
Reier, F.W., Bornholdt, C., Hoffmann, D., Morl, L., Weinert, C.M.
The realisation of TBQW structures requires material of optimised optical, electrical and structural properties. Therefore investigations on the MOVPE growth conditions were carried out which is be...
Reier, F.W., Bornholdt, C., Hoffmann, D., Morl, L., Weinert, C.M.
Large electro-optic modulation is available in InP based photonic devices for communication systems working in the 1.55 mu m window. This is because the quantum confined Stark effect (QCSE) can be...
Albrecht, P., Heidrich, H., Loffler, R., Morl, L., Reier, F., Weinert, C.M.
A polarization insensitive fibre port for integration in complex PICs has been demonstrated. The spot-size transformation is performed by a thickness taper integrated with an uncladded InGaAsP/InP...
A waveguide taper design is presented for InGaAsP/InP unclad rib waveguides with relaxed fabrication tolerances and polarization- independent fiber mode matching with 1 dB loss.
Monolithically integrated nonlinear interferometers for all-optical switching (1996)
Jahn, E., Agrawal, N., Pieper, W., Franke, D., Furst, W., ...
We report on the development of monolithically integrated InGaAsP active/passive waveguide interferometers for all-optical switching including both Sagnac and Mach-Zehnder configurations.
A waveguide taper design for uncladded rib or channel waveguides on InGaAsP-InP with polarization-independent coupling loss to the fiber is proposed. The spot size variation of the guided mode along...
Albrecht, P., Heidrich, H., Loffler, R., Mori, L., Reier, F., Weinert, C.M.
Polarisation independent mode transformers were fabricated by core thickness tapering in uncladded InGaAsP/InP rib waveguides intended for integration into PICs. No epitaxial regrowth is needed. The...
Jahn, E., Agrawal, N., Pieper, W., Franke, D., Furst, W., ...
A Sagnac interferometer consisting of a semiconductor laser amplifier and a 3 dB coupler monolithically integrated within a waveguide loop mirror is fabricated and its application as a 20 Gbit/s...
Morl, L., Weinert, C.M., Reier, F., Stoll, L.
The thickness of the waveguide core of uncladded InGaAsP/InP rib waveguides is tapered to fabricate new spot-size transformers without epitaxial regrowth or etching of deep grooves. The coupling loss...
Haes, J., Baets, R., Weinert, C.M., Gravert, M., Nolting, H.P., Andrade, M.A., ...
The performance and accuracy of a number of propagative algorithms are compared for the simulation of tapered high contrast step index slab waveguides. The considered methods include paraxial as well...
Jahn, E., Agrawal, N., Arbert, M., Franke, D., Ludwig, R., ...
We demonstrate all-optical error-free demultiplexing of 10, 20 and 40 Gbit/s to 5 Gbit/s by using a monolithically integrated Mach-Zehnder interferometer with two semiconductor laser amplifiers.
Morl, L., Weinert, C.M., Reier, F., Stoll, L.
New spot-size transformers for uncladded InGaAsP/InP rib waveguides were fabricated by core thickness tapering, obviating epitaxial regrowth and deep grooves. The coupling loss for flat-end fibres is...
Jahn, E., Agrawal, N., Arbert, M., Franke, D., Ludwig, R., ...
The authors demonstrate all-optical error-free demultiplexing of 10, 20 and 40 Gbit/s to 5 Gbit/s data signals by using a monolithically integrated Mach-Zehnder interferometer with two semiconductor...
Fast 2*2 Mach-Zehnder optical space switches using InGaAsP-InP multiquantum-well structures (1995)
Agrawal, N., Weinert, C.M., Mekonnen, G.G., Franke, D., Bornholdt, C., ...
We report fast 2*2 Mach-Zehnder optical space switches by using quantum confined Stark effect in InGaAsP-InP multiquantum-well structures that are ultracompact, require low voltages, and employ a...
A three-dimensional finite difference method scheme for simulation of multimode interference couplers with arbitrary waveguide cross section is presented. With this method we investigate the...
A self-consistent finite difference method for the simulation of electron transfer structures is developed and applied to optimize InGaAsP/InP QW structures for fast optical switching devices....
2*2 optical space switches using InGaAsP/InP MQW structures for 10-GHz applications (1994)
Agrawal, N., Franke, D., Weinert, C.M., Bornholdt, C.
Summary form only given. In this paper we demonstrate InGaAsP-InP MQW 2*2 optical space switches that show excellent dc switching performance and are capable of operation at and beyond 10 GHz. Both...
A self-consistent finite difference method for the simulation of quantum well electron transfer structures is developed and applied to optimize InGaAsP/InP/InAlAs structures for fast optical...
Polarization independent Mach-Zehnder Interferometer on III-V-semiconductors (1993)
A new design concept for a rib waveguide based polarization independent Mach-Zehnder interferometer is presented, and a device in the GaInAsP/InP material system is simulated combining a...
Polarization-independent Mach-Zehnder interferometer on III-V semiconductors (1993)
A new design concept for a rib waveguide-based polarization independent Mach-Zehnder Interferometer is presented, and a device in the GaInAsP/InP material system is simulated combining a full...
Agrawal, N., Reier, F.W., Bornholdt, C., Weinert, C.M., Li, K.C., Harde, P., ...
We report substantial progress in the growth of multi-quantum-well electron transfer optical modulator structures by metalorganic vapor phase epitaxy, which is made possible as a consequence of the...
Monolithic integrated wavelength duplexer-receiver on InP (1993)
Bornholdt, C., Trommer, D., Unterborsch, G., Venghaus, H., Weinert, C.M.
The monolithic integration of a detector stage comprising a photodiode and a field-effect transistor with a load resistor and a wavelength duplexer, realized in the GaInAsP/InP material system, is...
Vectorial simulation of passive TE/TM mode converter devices on InP (1993)
Accurate calculations of polarization rotation at abrupt waveguide interfaces are performed by a vectorial two-dimensional finite difference scheme. It is shown that the small orthogonal component of...
Meander-type wavelength demultiplexer with weighted coupling (1992)
Venghaus, H., Bornholdt, C., Kappe, F., Weinert, C.M.
An experimental and theoretical investigation of meander-type wavelength demultiplexers with weighted coupling is reported. Numerical simulations have been performed combining a two-dimensional...
Three-dimensional coupled mode method for simulation of coupler and filter structures (1992)
A method based on coupled mode theory for numerical simulation of three-dimensional structures is presented. It can be applied to all coupling structures for which the interaction with radiation...
Integrated wavelength demultiplexer-receiver on InP (1992)
Bornholdt, C., Trommer, D., Unterborsch, G., Bach, H.G., Kappe, F., Passenberg, W., ...
A detector stage comprising a photodiode, a field-effect transistor, and a load resistor, and a wavelength demultiplexer have been monolithically integrated in the GaInAsP/InP material system. Chips...
Passive mode converter with a periodically tilted InP/GaInAsP rib waveguide (1992)
Heidrich, H., Albrecht, P., Hamacher, M., Schroeter-Janssen, H., Weinert, C.M.
TE to TM converters with constant 45 degrees operation are a key component in OEICs for coherent optical system applications. A passive TE/TM-mode converter with a laterally tilted rib waveguide...
Theoretical investigations of optical waveguide tapers on InGaAsP/InP (1991)
Optical waveguide tapers which connect two dielectric waveguides with different spot sizes of the field distribution are investigated theoretically. Taking the coupling of a glass fiber to a...
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...
Heidrich, H., Hamacher, M., Albrecht, P., Engel, H., Hoffmann, D., Imhof, D., ...
The fabrication of an integrated GaInAsP/InP polarisation diversity circuit is described. The optoelectronic integrated circuit (OIC) is designed with respect to high process tolerances and easy...
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...
Meander coupler: A novel structure for WDM-applications (1990)
Kappe, F., Bornholdt, C., Reier, F., Stenzel, R., Venghaus, H., ...
The authors have realized a novel filter in GaInAsP/InP, which is a codirectional asymmetric coupler with periodic variation of the coupling constant. The transmission exhibits a sinc2-dependence,...
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...
WDM components on the basis of InGaAsP/InP directional couplers (1990)
Bornholdt, C., Kappe, F., Nolting, H.P., Stenzel, R., Venghaus, H., Weinert, C.M.
The paper describes the production of two wavelength-selective multiplexer/demultiplexer ( lambda -muldex) components intended to become parts of an integrated optical convertor for a bidirectional...
Meander coupler, a novel wavelength division multiplexer/demultiplexer (1990)
Bornholdt, C., Kappe, F., Muller, R., Reier, F., Stenzel, R., ...
The authors have realized a novel wavelength division multiplexer/demultiplexer based on rib waveguides in GaInAsP/InP. The device is a strongly asymmetric codirectional coupler with periodic...
TE/TM mode splitters on InGaAsP/InP (1990)
Albrecht, P., Hamacher, M., Heidrich, H., Hoffmann, D., Nolting, H., Weinert, C.M.
In a monolithic heterodyne polarization diversity receiver, mode splitters which effectively separate the TE and TM polarization of the optical wave are required. For this purpose, a directional...
Two-dimensional simulation methods (integrated optics) (1989)
The production of integrated optical components based on semiconductors involves elaborate procedures. This applies to the growing of III-V components such as InP, the generation of grating-like...