L. Stoll

Grating spectrograph integrated with photodiode array in InGaAsP/InGaAs/InP

A grating spectrograph integrated monolithically for the first time in the InGaAsP system with a photodiode array for a dense WDM application is presented for the 1.5 mu m wavelength region. The chip provides 42 wavelength channels with a spacing of 4 mm, a channel crosstalk of approximately -15 dB, an internal photodiode efficiency of 90%, and a photodiode capacitance of 0.33 pF. The chip needs no optical adjustments. It is therefore well suited for mass production.<<ETX>>

Grating spectrograph in InGaAsP/InP for dense wavelength division multiplexing

A grating spectrograph in InGaAsP/InP suitable for use in the wavelength region from 1.2 to 1.6 μm is presented. Experiments for devices with a channel spacing of 3.7 nm and more than 30 channels between 1.48 and 1.59 μm are described. The measured cross talk level is below −25 dB. The devices have only very low polarization sensitivity. This spectrograph is suited for monolithic integration with photodiodes, laser diodes, or optical amplifiers on a single chip.

Design and fabrication of monolithic optical spot size transformers (MOSTs) for highly efficient fiber-chip coupling

A novel type of monolithic optical spot size transformer realized in the InP/InGaAsP material system combines many desirable features like high fiber-chip coupling efficiency, large spot size transformation, high tolerances for fiber alignment, simple fabrication, and straightforward integrability with other devices. The spot size transformation is accomplished by two waveguide sections tapered in the vertical and lateral directions, respectively. We discuss design issues, describe the fabrication process, give experimental results, and present the monolithic integration of the spot size transformers with a current controlled directional coupler switch. >

A completely packaged strictly nonblocking 8/spl times/8 optical matrix switch on InP/InGaAsP

We report the fabrication of a completely packaged (including electronic drivers) strictly nonblocking transparent optical 8/spl times/8 matrix switch for routing applications at wavelength 1.55 /spl mu/m. The matrix is realized in a hybrid way from eight identical submodules each containing a single InP/InGaAsP chip with two 1/spl times/8 switches in parallel. The average values for fiber-matrix-fiber insertion loss and cross talk suppression are 20 and 28 dB, respectively. The usable wavelength range is 1450-1600 nm. The results indicate that large InP/InGaAsP switching matrices may be realized.

Self-aligned packing of an optical switch array with integrated tapers

An array of 2/spl times/2 switches with integrated tapers has been pigtailed using a silicon submount to self-align both chip and single-mode fibers. Electrical contacts were wirebonded through an opening etched in the submount. We report fiber-to-fiber insertion loss below 10 dB and measurements of wavelength and temperature dependence of the module.<<ETX>>

A 1/spl times/8 InP/InGaAsP optical matrix switch with low insertion loss and high crosstalk suppression

We present a current controlled passive 1/spl times/8 InP/InGaAsP optical matrix switch for routing applications at wavelength 1.55 /spl mu/m. It is realized in a tree architecture and has integrated tapers for efficient fiber butt coupling. An AR coated device has average fiber-chip-fiber insertion losses of 6.8 and 6.3 dB for TE and TM polarizations, respectively. The homogeneity of the eight outputs is better than 0.3 dB in each polarization state. The crosstalk suppression is better than 19 dB. The performance of the device indicates that large InP-based switching matrices can be realized.

A coherent OFDM switching system for flexible optical network configuration

A coherent optical switching node based on the combination of a frequency conversion stage with a space switching matrix is proposed for flexible interconnection of future integrated broadband communication networks. The basic system concept is presented together with the architecture of a demonstrator, which allows one to study the functionality available in future networks. The major subsystems and components of the demonstrator are described, and experimental results concerning frequency stabilization, frequency switching, and space switching are presented. >

Integrated optical switches on InP for network configuration and distribution

We report the design, fabrication, and performance of various 2/spl times/2 and 4/spl times/4 optical switches. We present the monolithic integration of laser diodes and switches, and on-chip optical mode transformers for effective fiber to chip coupling. Polarization independent switching with a current of 9 mA is demonstrated. An output power of 0.5 mW from a chip containing a laser diode and a switch has been achieved. The coupling loss of a butt coupled single mode fiber to an InP waveguide via an integrated mode transformer is as low as 1.5 dB.<<ETX>>

Leben im intelligenten Heim

Leben im intelligenten Heim — das ist das Thema, mit dem wir uns die nachsten 20 Minuten beschaftigen werden. Der eine oder andere von Ihnen hat wohl schon davon gehort, vielleicht unter dem Namen intelligentes Heim, vielleicht unter einem anderen. Sehr viele Namen werden verwendet: Haus der Zukunft, intelligentes Haus, Multimedia Home, Internet Home, e-Home, Smart Home... und alle meinen sie das gleiche: Ein Wohnbereich, der durch neue vernetzte Gerate und neue elektronische Services dem Bewohner eine neue Qualitat des Wohnens ermoglicht. Der Name, den ich in diesem Vortrag verwenden werde, heist Smart Home.