Bert Offrein
IBM Research, Science and Technology Department, Department Member
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Ultra-compact tunable add/drop components, based on the resonant coupler concept, are realized in high index-contrast silicon-oxynitride waveguides. Thermo-optic heaters are used to tailor and tune the filter characteristic
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Abstract Building blocks and experimental results of an optical card-backplane-card link with waveguides embedded into the boards and butt-coupled optoelectronic modules are presented. Important next steps for acceptance of the technology... more
Abstract Building blocks and experimental results of an optical card-backplane-card link with waveguides embedded into the boards and butt-coupled optoelectronic modules are presented. Important next steps for acceptance of the technology by system developers ...
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Optical interconnects have gradually replaced electrical interconnects in the long-distance telecom, local-area, and rackto- rack link classes. We believe that this transition will also happen in the card-backplane-card datacom link... more
Optical interconnects have gradually replaced electrical interconnects in the long-distance telecom, local-area, and rackto- rack link classes. We believe that this transition will also happen in the card-backplane-card datacom link class, both for bandwidth*length reasons and for density reasons. In analogy to the transition from individually wired boards to integrated printed circuit boards, we believe that eventually board-level optical interconnects
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This paper describes methods to control and manipulate birefringence in SiliconOxyNitride waveguides and devices. Each method is demonstrated by measurements on example devices. The methods and devices that will be covered are: Reduction... more
This paper describes methods to control and manipulate birefringence in SiliconOxyNitride waveguides and devices. Each method is demonstrated by measurements on example devices. The methods and devices that will be covered are: Reduction of heater induced birefringence in a dynamic gain equalizer by heater design or etched trenches. Reduction of polarization mode dispersion in a tunable dispersion compensator by UV
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Terabus is based on a silicon-carrier interposer on an organic card containing 48 polymer waveguides. We have demonstrated 4times12 arrays of low power optical transmitters and receivers, operating up to 20 Gb/s and 14 Gb/s per channel... more
Terabus is based on a silicon-carrier interposer on an organic card containing 48 polymer waveguides. We have demonstrated 4times12 arrays of low power optical transmitters and receivers, operating up to 20 Gb/s and 14 Gb/s per channel respectively
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ABSTRACT Fast pulse-generating laser sources at 10 GHz are commercially available. For future communications system applications of these light sources at 40 GHz, we developed a passive, fully integrated optical 10 to 40 GHz time-domain... more
ABSTRACT Fast pulse-generating laser sources at 10 GHz are commercially available. For future communications system applications of these light sources at 40 GHz, we developed a passive, fully integrated optical 10 to 40 GHz time-domain multiplexer. This device is very compact (16×5 mm2) and robust, whereby its miniaturization and robustness are based on the high-index-contrast silicon-oxynitride (SiON) waveguide technology used. This 4X multiplexer consists of two cascaded asymmetric Mach-Zehnder structures. Thereby a total of three directional couplers and two delay lines of 50 ps and 25 ps, respectively, are cascaded. Because of the high SiO2-SiON index contrast of 3.8 % it was possible to realize a multiplexer device with bending radii of less than 1.0 mm in an ultra-compact double-folded design. The slightly unbalanced attenuation in the delay lines was pre-compensated by the directional coupler design, i.e. by detuning from 50 % : 50 % coupling ratio. We demonstrated experimentally that with a fundamentally mode-locked 10 GHz Er:Yb:glass laser source at the design wavelength of 1535 nm our 4X multiplexer produces a 40 GHz pulse train with < 0.22 dB pulse-to-pulse power variation and < 350 fs timing jitter. Although the current device is designed for 40 GHz, its principle can be applied to 160 GHz or higher, provided that suitable pulse sources are available.
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Research Interests: Electron Beam Lithography, Photonics, Numerical Method, Optimization, Simulation, and 11 moreQuality Factor, Q factor, Design optimization, Optical fiber, Finite Difference, Reactive ion etching, Resonance Frequency, Finite Difference Time Domain, Inductive coupling, Supercomputer, and Resonant Frequency
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Research Interests: Optics, Medical Imaging, Fiber Optics, Evolutionary Computation, Telecommunications, and 19 morePhotonics, Optimization, Society, Silica, Optical, Light, Fabrication, Phased Array, Lithography, Optical physics, Evolutionary Algorithm, Finite Difference, Three Dimensional, Planar Waveguide, Electrical And Electronic Engineering, Lightwave, Ring Resonator, Finite Difference Methods, and Beam Propagation Method
This paper deals with two types of thermo-optically tunable add-drop filters realized by means of different technologies: fiber-matched low-pressure chemical vapor deposited (LPCVD)-grown SiO2 waveguides and plasma-enhanced chemical vapor... more
This paper deals with two types of thermo-optically tunable add-drop filters realized by means of different technologies: fiber-matched low-pressure chemical vapor deposited (LPCVD)-grown SiO2 waveguides and plasma-enhanced chemical vapor deposition ( ...
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A successful implementation of optics into PCBs (printed circuit boards) requires a precise passive alignment of optical elements relative to the optical waveguides in the board. We tackled this challenge with a novel concept that allows... more
A successful implementation of optics into PCBs (printed circuit boards) requires a precise passive alignment of optical elements relative to the optical waveguides in the board. We tackled this challenge with a novel concept that allows the passive alignment onto a PCB of any optical or optoelectronic building block with a precision of a few micrometers. Markers, structured into a
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Abstract We have developed parallel optical interconnect technologies designed to support terabit/s-class chip-to-chip data transfer through polymer waveguides integrated in printed circuit boards (PCBs). The board-level links represent a... more
Abstract We have developed parallel optical interconnect technologies designed to support terabit/s-class chip-to-chip data transfer through polymer waveguides integrated in printed circuit boards (PCBs). The board-level links represent a highly integrated packaging ...
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For application in communication networks, polarization-independent planar optical waveguiding structures are essential, because the polarization state of the optical signal in an optical network is arbitrary. A new concept for... more
For application in communication networks, polarization-independent planar optical waveguiding structures are essential, because the polarization state of the optical signal in an optical network is arbitrary. A new concept for polarization-independent waveguides simply adds a thin birefringence-compensating layer, which results in a double-core waveguiding structure. One of the major advantages of the double-core concept is its technological simplicity. The impact
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We present a tunable add-drop filter for wavelength division multiplexing (WDM) networks based on the resonant coupler (RC) principle. The device operates in the 1550-nm window with a wavelength spacing of 1.6 nm (200 GHz) and a... more
We present a tunable add-drop filter for wavelength division multiplexing (WDM) networks based on the resonant coupler (RC) principle. The device operates in the 1550-nm window with a wavelength spacing of 1.6 nm (200 GHz) and a periodicity of 6.4 nm (800 GHz). The splitting of the add and drop functions in an add-after-drop configuration results in extremely low homowavelength
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... Furthermore, wavelength-division multiplexing (WDM) with large channel counts offers extensions of the capacity in existing fiber systems [1]. WDM transmission systems are widely deployed in wide-area networks (WANs), and are now... more
... Furthermore, wavelength-division multiplexing (WDM) with large channel counts offers extensions of the capacity in existing fiber systems [1]. WDM transmission systems are widely deployed in wide-area networks (WANs), and are now beginning to enter metropolitan-area ...
Research Interests: Information Systems, Optical Communication, Adaptive Optics, Integrated Optics, Computer Software, and 14 moreSilica, Refractive Index, Dispersion Compensation, High performance, Chip, Silicon Oxide, Community Networks, IBM, Planar Lightwave Circuit, Planar Waveguide, Single Mode, Arrayed Waveguide Grating, Finite Impulse Response (FIR), and Infinite Impulse Response (IIR)
We identify applications for optics-enabled printed circuit boards, together with a list of requirements that have to be met for real-world products. We draw conclusions for the technology choices, and present our approaches and... more
We identify applications for optics-enabled printed circuit boards, together with a list of requirements that have to be met for real-world products. We draw conclusions for the technology choices, and present our approaches and experiments.
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We discuss some of the trade-offs that we are facing when choosing design parameters for future optical backplane interconnects. We present some of our current choices, along with experimental module-and system-level results.
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ABSTRACT A simple 40 GHz pulse source combining a fundamentally modelocked 10 GHz laser with a planar waveguide integrated time division multiplexer is demonstrated. Pulse trains with >5 dBm average power and <350 fs rms... more
ABSTRACT A simple 40 GHz pulse source combining a fundamentally modelocked 10 GHz laser with a planar waveguide integrated time division multiplexer is demonstrated. Pulse trains with >5 dBm average power and <350 fs rms timing jitter were achieved
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Optical waveguides embedded in a printed circuit board offer a substantial increase in the achievable bandwidth density compared with todays electrical interconnects. Specific challenges and solutions to integrate optical interconnects in... more
Optical waveguides embedded in a printed circuit board offer a substantial increase in the achievable bandwidth density compared with todays electrical interconnects. Specific challenges and solutions to integrate optical interconnects in a printed circuit board are addressed.
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1: COBRA Institute, Eindhoven University of Technology, The Netherlands, 2: Siemens Networks GmbH & Co.KG, SN MN PG NT CT, München, Germany, 3: Fraunhofer Institute for Telecommunications, Heinrich-Hertz-Institut, Berlin, Germany, 4: AT&T... more
1: COBRA Institute, Eindhoven University of Technology, The Netherlands, 2: Siemens Networks GmbH & Co.KG, SN MN PG NT CT, München, Germany, 3: Fraunhofer Institute for Telecommunications, Heinrich-Hertz-Institut, Berlin, Germany, 4: AT&T Labs-Research, ...
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Introduction In high bitrate optical transmission systems dispersion compensation is a critical aspect, as the dispersion tolerances will be smaller than the temporal dispersion fluctuations in the system, eg due to rerouting or... more
Introduction In high bitrate optical transmission systems dispersion compensation is a critical aspect, as the dispersion tolerances will be smaller than the temporal dispersion fluctuations in the system, eg due to rerouting or temperature and power variations. Therefore, to ...