Loading [MathJax]/extensions/MathMenu.js
N. Matuschek - IEEE Xplore Author Profile

Showing 1-25 of 42 results

Filter Results

Show

Results

An optical transceiver module, based on a broadband Superluminescent Light-Emitting Diode (SLED) at 1550 nm and an integrated receiver photodiode, has been developed. The compact 14-pin butterfly (BTF) module integrates micro-optical lenses, a flatpack optical isolator, a 50:50 beam splitter and other components on a temperature-controlled, free-space optical bench platform and is delivering, at a...Show More
A novel, 14-pin Butterfly (BTF) light source module, incorporating a broadband Superluminescent Light-Emitting Diode (SLED) at 1550 nm, has been developed for inertial measurement unit (IMU) applications. The compact BTF module integrates micro-optical lenses, a flatpack optical isolator, a monolithic 1:3 beam divider and other components on a temperature-controlled, free-space optical bench platf...Show More
We are demonstrating a high-power, broadband 840-nm light source, where amplified spontaneous emission (ASE) from a superluminescent light emitting diode (SLED) is amplified by a semiconductor optical amplifier (SOA) in order to generate power levels of 100-300 mW in free-space. The optical architecture of this light source resembles a master oscillator power amplifier (MOPA) configuration.Show More
Superluminescent light-emitting diodes (SLEDs) are very attractive as compact, highly efficient light sources for various applications in the visible red spectral region. We simulate and discuss the electro-optical performance of SLEDs operating at center wavelengths of 625-650 nm. We show that for current SLED structures the optimum wavelength with respect to maximum luminous flux and power conve...Show More
We report a broad range of swept source performances based on a highly-flexible external cavity laser architecture embodied within a compact butterfly package. Multiple spectral regions from 830 nm to 1630 nm and sweep frequencies from 1 kHz to 200 kHz are demonstrated.Show More
We present a quasi-static model for the accurate simulation of swept source external cavity lasers. The model is based on steady-state solutions of multi-mode rate equations. The wavelength sweep is incorporated in the model by a spectral slicing technique. A comparison with experimental results demonstrates the usefulness of our approach. Limitations for the simulation of high-speed swept sources...Show More
The availability of analytical models and numerical simulation tools is inevitable for the development and optimization of broadband high-power superluminescent light-emitting diodes (SLEDs) and its applications. In this paper, various theoretical aspects of SLEDs are discussed, which are important for the successful design of new devices with superior performance. We study the suppression of resi...Show More
Numerical simulations are inevitable for the development and optimization of GaN-based superluminescent light-emitting diodes (SLEDs) for the blue and green spectral region. Depending on their application the devices have to be optimized with respect to given specifications. We discuss the simulation of various device performance parameters as well as the basic calibration of the full 3D device si...Show More
The performance of fiber Bragg grating (FBG) stabilized pump-laser modules is strongly influenced by changes of the state of polarization (SOP) arising from intrinsic and/or induced birefringence of the fiber. Birefringence changes the SOP as the light propagates back and forth between laser and FBG, which are separated by a distance of 1 to 2 m. As a result, the effective wavelength-selective fee...Show More
Depending on their application high-power semiconductor laser devices have to be optimized with respect to various design parameters. We discuss the simulation and optimization of the device performance with respect to electrical and thermal properties, output power, wavelength stability, and device reliability using the example of our latest pump-laser generation that has been developed and quali...Show More
Here, we report on the development and properties of our latest high power narrow-stripe G08 laser diode and fiber Bragg grating (FBG) stabilized module. The development of high power single-mode laser diodes and modules with a fiber-coupled power exceeding 0.5 W enables the fabrication of attractive sources for a wide range of frequency conversion and pumping applications.Show More
On the basis of Jones matrix calculus, we derive an effective reflector model for fiber Bragg grating (FBG) stabilized pump laser modules. This model includes a parameter that takes the effects of varying polarization upon propagation in the fiber into account. This feedback parameter is expressed as a function of the parameters describing the linear and circular birefringence in the fiber. It pro...Show More
A 600 mW laser at 980 nm with low RMS noise below 0.1% is presented, wavelength stabilized by a fiber Bragg grating with 20 pm bandwidth. The light is provided in a polarization maintaining single mode fiber.Show More
Fiber coupled light output power of highly reliable single mode laser diodes with an emission wavelength of around 980 nm has been increased by 40% as compared to former results. The devices reach in excess of 1.3 W ex-facet CW light output power with up to 60% power conversion efficiency and exhibit a vertical far-field of around 21/spl deg/. The maximum fiber coupled CW light output power amount...Show More
It is anticipated that in the near future erbium doped fiber amplifiers (EDFA) will find their way into new optical networking concepts, ranging from WDM systems in the metro sector to loss-compensation in optical switching. In order to be viable, these applications demand a technology, which in comparison to traditional systems is more compact, less costly, and more readily integrated, yet offers...Show More
Fiber Bragg grating (FBG) stabilized 980 nm LD pump laser modules are key components for erbium-doped fiber amplifier systems (EDFAs). For EDFA designers it is important to understand the effects of varying effective feedback on the pump laser properties. We present a new model, based on an extension of the well-known traveling-wave amplifier model that allows us to calculate polarization-dependen...Show More
To enable stable pump module operation at increased temperatures we have optimized our latest pump laser generation using multi-dimensional simulation tools. Poisson's equation, carrier continuity equations, and heat transport are solved self-consistently with the optical modes and the quantum-well carrier dynamics.Show More
Reliability testing of pump lasers is based on accelerated life tests with different stress conditions. These tests are well established and their underlying principle is the scaling of the device lifetime with different stress conditions. The stress conditions have to be chosen in such a way that the aging of the laser chip is accelerated but no additional aging effects compared to operating cond...Show More
Effects of polarization change in the feedback provided by fiber Bragg gratings that stabilize 980-nm pump lasers are investigated. The effective feedback in the proper transverse-electric polarization is calculated from an easily measured parameter, describing the polarization at the fiber grating. This provides a useful experimental tool to investigate the effect of feedback loss due to polariza...Show More
Light versus current (L-I) characteristics, of fiber Bragg grating stabilized 980-nm pump lasers, is experimentally studied and theoretically modeled. It is shown that a conventional design of such laser modules can result in sudden transitions between a coherence-collapse multimode emission, and a coherent single-mode state of operation.Show More
Summary form only given. We introduce a novel chirped mirror design technique to further extend the dispersion compensation range and to reduce detrimental dispersion oscillations. The fundamental idea behind this new approach is to suppress unwanted reflections at the top of the mirror stack by coating the mirror structure in reverse on the back side of a substrate with an index identical to eith...Show More
Newly developed wavelength stabilized 980 nm pump lasers demonstrate uncooled operation with >100 mW ex-fiber power over a record -15/spl deg/C to 120/spl deg/C. With uncooled modules using these lasers, low cost optical amplifiers with ultra low power dissipation for metro systems become possible.Show More
Erbium doped fiber amplifiers (EDFAs) have become mature and well established components in optical networks. However, there is an increasing demand for low-cost, highly efficient pump sources deployed as small footprint components with low power consumption. We have reported previously on uncooled pump modules stabilized over a temperature range of 90 K with 95 mW optical output power from the fi...Show More
Summary form only given.So far, ultrashort pulse characterization techniques have measured the spatially averaged amplitude and phase of the input beam. For beams exhibiting a significant spatial structure, however, it is desirable to completely spatially resolve the pulses to be characterized. Complex spatial structure can be found, for example, in broadband Kerr-lens modelocked lasers as a conse...Show More