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...
Terahertz transmitters and receivers (2008)
THz spectroscopy promises attractive applications in various fields. Commercial use requires compact, room temperature and cost effective systems. The role of telecom technology and recent...
Terahertz systems: Novel applications for telecom technology (2008)
THz spectroscopy promises attractive applications in various fields. Commercial use requires compact, room temperature and cost effective systems. Exploiting telecom and InP technologies here...
Bornholdt, C., Troppenz, U., Kreissl, J., Rehbein, W., Sartorius, B., Schell, M., ...
A passive feedback section 1.5 µ DFB laser is applied as 40 Gbit/s transmitter. The error free transmission over 320 km SMF demonstrates the good performance of this compact and low cost device.
40 Gbit/s directly modulated passive feedback laser (2008)
Troppenz, U., Kreissl, J., Rehbein, W., Bornholdt, C., Sartorius, B., Schell, M.
High speed directly modulated lasers are key devices for compact, low cost transmitters. In this paper we describe the mechanism of modulation bandwidth enhancement by passive feedback sections and...
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...
Schneller Photoleiter und Verfahren zur Herstellung und Antenne mit Photoleiter (2007)
Sartorius, B., Künzel, H., Röhle, H., Biermann, K.
DE 102007012475 A1 UPAB: 20081008 NOVELTY - The photoconductor has a layer stack with a photo conducting semiconductor layer between two semiconductor boundary layers having a band gap larger than...
Verfahren zum Erzeugen und kohaerenten Detektieren von Terahertzstrahlung (2007)
WO 2009036984 A1 UPAB: 20090423 NOVELTY - The device has a laser light source (1) and a transmission antenna (2) that is activated by the laser light source for creating the terahertz radiation. A...
Halbleiterlaser und Verfahren zum Betreiben eines Halbleiterlasers (2007)
Sartorius, B., Kreissl, J., Troppenz, U., Bornholdt, C., Möhrle, M.
WO 2009036904 A1 UPAB: 20090409 NOVELTY - The semiconductor laser has an active region (1) which is designed as a distributed feedback laser (DFB) laser, and a passive resonator section (2), which is...
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...
Sartorius, B., Feiginov, M., Sydlo, C.
WO 2008067957 A2 UPAB: 20080627 NOVELTY - The device has two single mode semi conductor lasers with a wavelength difference relative to each other for generating beat signals with the terahertz...
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...
Slovak, J., Tekin, T., Bornholdt, C., Sartorius, B., Lach, E., Schmidt, M., ...
A self-pulsating PhaseCOMB-laser is successfully applied for triggering of 170.6:42.7 Gbit/s DEMUX-circuit in 8 x 170.6 Gbit/s DWDM field experiment. An error free detection of the demultiplexed PRBS...
Wellenlaengen-erhaltender optischer Signalregenerator (2005)
Bornholt, C., Sartorius, B., Slovak, J.
WO2005029734 A UPAB: 20050512 NOVELTY - The regenerator has an optical clock regeneration stage (2), which generates synchronized, stable optical reset clock pulses for a data signal (1). The...
Isolator-free directly modulated complex-coupled DFB lasers for low cost applications (2005)
Kreissl, J., Brinker, W., Lenz, E., Gärtner, T., Rehbein, W., Bauer, S., ...
Complex-coupled and index-coupled DFB lasers are fabricated and characterized regarding their feedback sensitivity. The feedback stability is improved by 15 dB using the complex coupling. BER...
Mitigation of PMD @ 40 Gb/s using an optically clocked 3R regenerator (2005)
Bornholdt, C., Slovak, J., Schmidt, C., Sartorius, B.
Mitigation of PMD distortions is performed at 40 Gb/s using a wavelength preserving semiconductor based all-optical 3R regenerator. The mitigation of PMD is successfully demonstrated by eye analysis...
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...
Dynamic behavior of optically clocked 4 mm UL-SOA at 40 Gbit/s (2004)
Slovak, J., Bornholdt, C., Busolt, U., Bramann, G., Sartorius, B.
Semiconductor optical amplifiers have been applied successfully for optical signal processing, e. g. optical switching, wavelength conversion, demultiplexing, signal regeneration. The principle of...
Compact 40 GHz RZ-transmitter design applying self-pulsating lasers (2004)
Bobbert, C., Kreissl, J., Molle, L., Raub, F., Rohde, M., Sartorius, B., ...
A compact 40 Gbit/s RZ transmitter has been designed using a self-pulsating PhaseCOMB laser. The novel transmitter has been tested in a transmission experiment over 80 km of SMF. No power penalty was...
Nonlinear dynamics of semiconductor-lasers with active optical feedback (2004)
Bauer, S., Brox, O., Kreissl, J., Sartorius, B., Radziunas, M., Sieber, J., ...
An in-depth theoretical as well as experimental analysis of the nonlinear dynamics in semiconductor lasers with active optical feedback is presented. Use of a monolithically integrated multisection...
Semiconductor-based all-optical 3R regenerator demonstrated at 40 Gbit/s (2004)
Bornholdt, C., Slovak, J., Sartorius, B.
A novel 'optically clocked' 3R regenerator (OC-3R) preserving the data wavelength and logic is presented. It is based on two compact semiconductor components, avoiding expensive and bulky EDFAs. The...
Self-pulsating multi-section DFB lasers and their applications (2003)
Bauer, S., Brox, O., Bornholdt, C., Slovak, J., Kreissl, J., Sartorius, B.
Self-pulsating DFB lasers are devices with a unique combination of features. An overview for these devices is given and their key features are outlined. Examples show their potential for applications...
Novel all-optical 3R-signal regenerator at 10 Gbit/s (2003)
Slovak, J., Bornholdt, C., Sartorius, B., Nolting, H.P.
A true all-optical 3R regenerator based on the "Alternating Data Clock" scheme is assembled applying compact semiconductor devices. Bit error rate measurements at 10Gbit/s show a negative penalty of...
Jitter analysis of all-optical clock recovery at 40 GHz (2003)
Bornholdt, C., Slovak, J., Möhrle, M., Sartorius, B.
The jitter of optical clock recovery based on self-pulsating PhaseCOMB-lasers is analyzed using a new generation sampling scope. An excellent restoration function of the clock is demonstrated at 40...
High-frequency pulsations in DFB lasers with amplified feedback (2003)
Brox, O., Bauer, S., Radziunas, M., Wolfrum, M., Sieber, J., Kreissl, J., ...
We describe the basic ideas behind the concept of distributed feedback (DFB) lasers with short optical feedback for the generation of high-frequency self-pulsations and show the theoretical...
Modeling of mode control and noise in self-pulsating phasecomb lasers (2003)
Wünsche, H.J., Radziunas, M., Bauer, S., Brox, O., Sartorius, B.
Self-pulsations in Phase Controlled Mode Beating lasers (PhaseCOMB) are very attractive for all-optical clock recovery at ultra-high bit rates. In this paper we apply the comprehensive simulation...
Semiconductor based true all-optical synchronous modulator for 3R regeneration (2003)
Tekin, T., Bornholdt, C., Slovak, J., Schlak, M., Sartorius, B., Kreissl, J., ...
Optical microwave source (2002)
Bauer, S., Brox, O., Kreissl, J., Sahin, G., Sartorius, B.
A novel device for tunable optical microwave generation is presented. The capability to tune the microwave frequency as well as the locking characteristics of the developed device are experimentally...
3R Regenerator mit Wellenlaengenumsetzung (2002)
WO 200284900 A UPAB: 20030113 NOVELTY - A continuously operated laser (COL) (5) generates/adjusts an output wavelength alongside a device (1) for generating clock pulses (DGCP) and a discriminator...
Verfahren zur Ansteuerung eines 3R Regenerators (2002)
Sartorius, B., Bauer, S., Bornholdt, C., Brox, O.
WO 200284901 A UPAB: 20030111 NOVELTY - Single data signal pulses (1) and clock signal pulses (2) are operated. Combined data/clock pulses (4) are beamed into a discriminator element, delayed by half...
All optical clock recovery at 80 GHz and beyond (2001)
Bornholdt, C., Bauer, S., Mohrle, M., Sartorius, B.
Modelling of self-pulsations based on phase controlled mode beating (PhasCOMB) shows a speed potential of 160 GHz. A first device is fabricated. A frequency tuning range of 25 to 82 GHz is obtained...
40 GHz optical clock recovery for application in asynchronous networks (2001)
Sartorius, B., Bornholdt, C., Bauer, S., Mohrle, M.
Locking and unlocking to data packets is analysed for a 40 GHz optical clock. The clock locks within 3 ns to data containing 25% of "1" bits and it holds synchronisation for "0" sequences of 10 ns....
3R regeneration for all-optical networks (2001)
Optical signal regeneration is a key function needed for scalable all-optical networks. In this paper functional building blocks and schemes for all-optical 3R regeneration (Re-amplification,...
All-optical clock recovery for 3R optical regeneration (2001)
Scalable all-optical networks need 3R regeneration. Clock recovery is a key function. Bit-rate flexibility and ultrafast locking are important in future asynchronous Internet protocol (IP) networks....
Optical 3R regenerator based on Q-switched laser (2001)
Brox, O., Bauer, S., Bornholdt, C., Hoffmann, D., Mohrle, M., Sahin, G., ...
A polarization and wavelength insensitive Q-switched laser is applied in a 3R regenerator experiment. The optical regenerator shows a negative power penalty of -2 dB at a data rate of 10 Gb/s RZ. The...
Detuned grating multisection-RW-DFB lasers for high-speed optical signal processing (2001)
Mohrle, M., Sartorius, B., Bornholdt, C., Bauer, S., Brox, O., Sigmund, A., ...
We present a detailed description and a first theoretical study of an improved concept for high-frequency self-pulsations (SPs) in multisection (MS)-DFB lasers with an integrated phase tuning...
Laser based 3R regeneration for high-speed all-optical networks (2001)
Bauer, S., Brox, O., Bornholdt, C., Sartorius, B., Mohrle, M.
Novel devices for scalable signal processing in all-optical networks are presented. The devices are based on multisection DFB-lasers and can be used for high speed clock recovery and decision...
Alcatel-HHI collaboration on at all-optical 3R regeneration (2001)
Devaux, F., Leclerc, O., Lavigne, B., Brindel, P., Nolting, H.P., Sartorius, B.
All-optical 3R signal regeneration (2000)
Functional elements and architectures for building up 3R (re-amplification, re-shaping, and re-timing) regenerators are described. Loop experiments demonstrate the performance of optical 3R...
Dual-mode self-pulsating laser for broadband hybrid fibre radio-systems (2000)
Grosskopf, G., Rohde, D., Eggemann, R., Bornholdt, C., Bauer, S., Sartorius, B., ...
A self-pulsating laser is presented as a novel transmitter source for millimetre wave generation. The system performance is evaluated by bit error rate measurements in transmission experiments...
Hoffmann, D., Brox, O., Sahin, G., Mohrle, M., Sartorius, B.
We establish an extensive experimental registration technique to study the dependence of the pulsation in a three-section DFB-laser. The common feature of continuous pulsation domains is highlighted...
Detuned grating multi-section-RW-DFB-lasers for high speed optical signal processing (2000)
Mohrle, M., Sartorius, B., Bornholt, C., Bauer, S., Brox, O., Sigmund, A., ...
InGaAsP multisection-DFB-lasers with detuned gratings have been fabricated. Self-pulsation in the 40GHz range and the locking to data signals is demonstrated. Even higher self pulsation frequencies...
System application of 40 GHz all-optical clock in a 40 Gbit/s optical 3R regenerator (2000)
Sartorius, B., Bornholdt, C., Bauer, S., Mohrle, M., Brindel, P., Leclerc, O.
A new all-optical clock operating from 6 to 46 GHz is presented and tested in 40 Gbit/s soliton 3R regenerator. Error-free single-channel 40 Gbit/s loop transmission is demonstrated over more than...
Ultrafast locking optical clock for IP packet switching applications (2000)
Bauer, S., Bornholdt, C., Brox, O., Hoffmann, D., Mohrle, M., Sahin, G., ...
The locking time of an all-optical clock is investigated. Self-pulsating, DFB lasers with detuned gratings are applied the clock locks within 10 "one" bits (1 ns) to injected data packets and keeps...
Advanced devices and their features for future optical networks (2000)
Nowadays, optical networks are composed of point-to-point links with electronically switching and routing functions in the network nodes (SDH-, ATM-hierarchy). The evolution of the network will go to...
Grosskopf, G., Rohde, D., Eggemann, R., Bornholdt, C., Bauer, S., Sartorius, B., ...
In two experimental hybrid fiber radio systems the millimeter-wave carriers for the radio links at 40 and 60 GHz were remotely generated by optical heterodyning. In the first experiment at 40 GHz the...
Optical millimeter-wave generation and wireless data transmission using a dual-mode laser (2000)
Grosskopf, G., Rohde, D., Eggemann, R., Bauer, S., Bornholdt, C., Mohrle, M., ...
A dual-mode self-pulsating laser is presented as a transmitter source for millimeter wave generation in an experimental hybrid fiber radio system. The performance is evaluated by bit-error rate...
Self-pulsating DFB laser for all-optical clock recovery at 40 Gbit/s (2000)
Bornholdt, C., Sartorius, B., Schelbase, S., Mohrle, M., Bauer, S.
A first demonstration of a 40 Gbit/s all optical clock recovery module based on a design for a novel self-pulsating DFB laser is presented. The role of detuned gratings in the new device concept is...
Modeling self-pulsating DFB lasers with an integrated phase tuning section (2000)
Radziunas, M., Wünsche, H.J., Sartorius, B., Brox, O., Hoffmann, D., Schneidcr, K.R., ...
A theoretical model of a self-pulsating three-section DFB laser with an integrated phase tuning section is established. Parameters of an existing device are used for applying the model. Key...
All-optical clock recovery at 40 Gbit/s (1999)
Bornholdt, C., Sartorius, B., Mohrle, M.
A first demonstration of an all-optical clock recovery module based on a new generation of self-pulsating DFB-lasers to cover the 40 GHz range is reported. This paper reviews the device design and...
Towards the all-optical 3R regenerator: Performance of the optical clock (1999)
Sartorius, B., Bornholdt, C., Brox, O., Feiste, U., Mohrle, M.
An optical clock based on a self-pulsating DFB laser is applied and tested by BER measurements at 10 Gbit/s RZ in an experiment that is equivalent to an all-optical 3R regenerator with an ideal...
Bit-rate flexible all-optical clock recovery (1999)
Sartorius, B., Bornholdt, C., Brox, O., Ehrke, H.J., Hoffmann, D., Ludwig, R., ...
A 5 GHz to 20 GHz bit-rate flexible all-optical clock is presented. 10 GHz and 20 GHz pulse trace analysis and 8 Gbit/s to 11 Gbit/s bit-error-rate measurements demonstrate the system qualification....
System performance of an all-optical clock recovery module (1998)
Sartorius, B., Bornholdt, C., Brox, O., Ehrke, H.J., Hoffmann, D., Ludwig, R., ...
The system performance of an all-optical clock recovery module based on a self-pulsating DFB laser is characterized at 10 Gb/s. Penalty free operation is verified relative to a synthesizer in back to...
Analysis and compression of pulses emitted from an all-optical clock recovery module (1998)
Sartorius, B., Bornholdt, C., Brox, O., Mohrle, M., Brindel, P., Leclerc, O., ...
The pulses emitted from an all-optical clock recovery module based on a self-pulsating DFB laser are analysed using a streak camera. Pulse compression using fibres with negative dispersion is...
Diez, S., Schmidt, C., Hoffmann, D., Bornholdt, C., Sartorius, B., Weber, H.G., ...
An all-optical sampling technique that allows the simultaneous measurement of optical pulse intensities and wavelengths with a temporal resolution of about 1 ps is introduced. Using four-wave mixing...
All-optical clock recovery module based on self-pulsating DFB laser (1998)
Sartorius, B., Bornholdt, C., Brox, O., Ehrke, H.J., Hoffmann, D., Ludwig, R., ...
An all-optical clock recovery module is developed and tested in a 100 Gbit/s 105 km transmission experiment. A penalty free function of the optical clock relative to an electronic phase-locked loop...
Dispersive self-Q-switching in self-pulsating DFB lasers (1997)
Sartorius, B., Mohrle, M., Reichenbacher, S., Preier, H., Wünsche, H.J., Bandelow, U.
Self-pulsations reproducibly achieved in newly developed lasers with two distributed feedback sections and with an additional phase tuning section are investigated. The existence of the dispersive...
Sartorius, B., Mohrle, M., Reichenbacher, S., Eggemann, R.
All-optical clock recovery from 10 Gb/s PRBS RZ data is performed using self-pulsations in DFB lasers with an integrated phase tuning section. In wavelength and polarization independent operation an...
Direct modulation of lasers by dispersive threshold switching (1996)
For switching on and off semiconductor lasers usually the gain in the active medium is varied by modulating the injection current. A second possibility is to integrate an absorber section and to...
Mirror modulated lasers: a concept for high speed transmitters (1996)
A new transmitter type 'MirMod' is presented, in which, for the first time an optical data pattern is generated by electrically modulating the reflectivity of laser mirrors. The pump current is kept...
Sartorius, B., Mohrle, M., Malchow, S., Reichenbacher, S.
Wavelength and polarisation independent synchronisation of DFB type self-pulsations is demonstrated for the first time. Newly developed DFB lasers with an integrated phase tuning section are applied....
Electrically switchable self-pulsations in integratable multisection DFB-lasers (1996)
Mohrle, M., Sartorius, B., Steingrüber, R., Wolfram, P.
An integratable version of a self-pulsating AR-coated multisection DFB-laser with a phase-tuning section integrated between two DFB sections is presented. It is shown that the phase current can act...
Sartorius, B., Mohrle, M., Reichenbacher, S., Ebert, W.
1.55- mu m InGaAsP-InP multi-section DFB lasers with an integrated phase tuning section have been fabricated. It is shown for the first time that the self-pulsation can be electrically switched on...
Sartorius, B., Mohrle, M., Feiste, U.
Two-section, 1.55- mu m quantum-well DFB lasers, with a very high kappa of 300/cm, show self-pulsation at a record frequency of 80 GHz. An extremely wide, continuous, electrical frequency tuning...
Feiste, U., Mohrle, M., Sartorius, B., Horer, J., Loffler, R.
Summary form only given. A record self pulsation frequency of 80 GHz and an extremely large continuous electrical frequency tuning range (12-64 GHz) for InGaAs QW lasers were achieved. Regarding the...
High speed all-optical functional elements using injection locked semiconductor lasers (1994)
Horer, J., Weich, K., Mohrle, M., Patzak, E., Sartorius, B.
Summary form only given. The speed of all-optical switching using injection locked lasers is analyzed. A model describing two-section lasers is developed yielding a speed above 20 Gb/s. The function...
High frequency locking at 18 GHz in a self pulsating DFB laser (1993)
Sartorius, B., Mohrle, M., As, D.J., Horer, J., Venghaus, H., Feiste, U.
Locking of self-pulsation to injected 18 GHz optical signals is reported for two-section DFB lasers. Details on RF linewidth and locking range are given and the suitability of the device for...
Optimization of the optical switching characteristics of two-section Fabry-Perot lasers (1993)
Horer, J., Weich, K., Mohrle, W., Sartorius, B.
Bistable two-section Fabry-Perot lasers with a saturable absorber have been fabricated, comprehensively characterized, and optimized with respect to gain and optical switching contrast. Best device...
Gigahertz self-pulsation in 1.5 mu m wavelength multisection DFB lasers (1992)
Mohrle, M., Feister, U., Horer, J., Molt, R., Sartorius, B.
Self-pulsation in InGaAsP/InP multisection distributed feedback (DFB) lasers was generated reproducibly by adjusting appropriate injection conditions. Frequencies of up to some gigahertz were...
Sartorius, B., Brandstattner, M.
The calibration and optimization of a two-wavelength transmission method for nondestructive thickness mapping of InGaAsP layers are described. In two-wavelength transmission, two beams are focused...
Sartorius, B., Reier, F., Wolfram, P.
Thermal degradation is identified as the origin for a variety of defects in epitaxial layers. The consequences of these defects are more critical than those of dislocations. It turns out that thermal...
Sartorius, B., Brandstattner, M., Venghaus, H.
By means of two-wavelength transmission the reflection and scattering losses at surfaces are cancelled out experimentally. A signal which is directly proportional to the light absorption is derived...
Lasing characteristics of InGaAs/InGaAsP MQW structures grown by low-pressure MOVPE (1991)
Rosenzweig, M., Ebert, W., Franke, D., Grote, N., Sartorius, B., Wolfram, P.
InGaAs/InGaAsP MQW SC lasers for 1.55 mu m emission wavelength with different numbers of quantum wells have been fabricated using low-pressure MOVPE. Photoluminescence and gain spectra and threshold...
Messverfahren zur Bestimmung kleiner Lichtabsorptionen (1991)
EP 443702 A UPAB: 19930928 The measuring system uses quasi-simultaneous detection of the transmission intensity of a measuring beam and a reference light beam having differing wavelengths. The light...
Optical thickness mapping of InGaAsP/InP layers (1991)
Sartorius, B., Brandstattner, M., Wolfram, P., Franke, D.
A two-wavelengths transmission method is presented for measuring the thickness of epitaxial layers with a resolution of better than 10 nm. The measuring speed is high which for the first time makes...
Nondestructive thickness mapping of epitaxial InGaAsP/InP layers (1990)
Sartorius, B., Brandstattner, M.
A new technique for fast and nondestructive thickness mapping based on optical absorption measurements is presented. An experimental setup in which unspecified losses are eliminated by a...
Origin and penetration depth of thermal degradation in InP (1989)
Thermal degradation is examined in a development stage in which local damage in the crystal lattice already exists, although the known surface deformations are not yet visible. The existence of these...
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...
In this paper the authors present an optical method to control the geometry of buried layers in optoelectronic heterostructures. The technique uses an optical microscope equipped for infrared...