Siemens Aktiengesellschaft

Gerhard Winzer

Hans F Mahlein

Achim Reichelt

Peter Baues

Franz Auracher

Herbert Michel

Ulrich Wolff

Josef Dirmeyer

Jochen Heinen

Reinhard Maerz

Markus-Christian Amann

Richard Matz

Lothar Stoll

Bernhard Stegmueller

Wolfgang Thulke

Walter Rauscher

Peter Moeckel

Reinhard Marz

Manfred Plihal

Norbert Odemar

Heinrich Schlotterer

Romuald V Tomkewitsch

A method for forming a three gate optical coupler, operating on a beam splitting principle, or a five gate optical coupler characterized by providing a carrier block having a pair of marks to define a line of a parting plane, creating a continuous branching waveguide structure having a waveguide node located adjacent to the parting plane of the carrier block by a ion exchange method, parting the carrier block in the parting plane, polishing the parted surfaces and forming a light transmitting optical layer, such as a frequency selective filter layer on a polished surface, then rejoining the two parts with the waveguides aligned. The method is particularly useful in forming three gate and five gate frequency multiplexers/demultiplexers, which have a continuous light waveguide structure except in the location of the frequency selective filter layer.

Light waveguide coupler having three or more gates and utilizing the

A coupling arrangement for coupling an optical fiber to a planar integrated optical component characterized by a V-shaped groove being formed in a surface of the substrate, at least one end of the groove being closed by a vertical substrate wall containing an optical window formed by an end of an integrated optical component in said substrate, and an end of an optical fiber being secured in said groove with an end face being positioned adjacent said optical window. The arrangement is preferably made by etching oblique channels into a substrate containing the optical component to form a bridge extending parallel with the optical component, the bridge is then removed to expose an optical window in a substantially vertically extending wall, and then the optical fiber is positioned and secured in the groove with the end face of the fiber being positioned adjacent the optical window.

Arrangement for coupling an optical fiber to a coupling window of a

An integrated optical arrangement for bidirectional optical message and signal transmission characterized by a common substrate having integrated thereon, a semiconductor laser, an optical detector and a direction selective coupling arrangement which coupling arrangement has a first port coupled to the laser, a second port coupled to the detector and a third port arranged for coupling light in and out of the arrangement with a first wavelength from the laser passing from the first port to the third port and the third port passing a second wavelength to the second port for detection. The arrangement further includes a wavelength selective filter being disposed in a waveguide extending to the second port for blocking light of the first wavelength but being transmissive to light of the second wavelength. The coupling arrangement can either be an optical directional coupler or a y-shaped waveguide fork.

Integrated-optical arrangement for bidirectional optical message or

A light branching element or diplexer comprising a first bi-directional light connection and a second and third unidirectional light connection. The unit is formed by a block having a straight surface groove with an embedded glass fiber which fiber is interrupted by a partially transmissive mirror lying on a slanting plane relative to the axis of the fiber. The light sensitive location of a light receiving semiconductor element is secured to the block adjacent to the mirror and the plane of the mirror is selected so that its normal extends out of the block at an angle of incidence smaller than 45.degree. to the axis of the fiber to reduce reflections from the semiconductor member back to the mirror and into the fiber.

Light diplexer of a communication system comprising three light

A monolithically integrated WDM demultiplex module has a film wave guide of InGaAsP fashioned on a substrate, a photodiode of InGaAs being applied to the film wave guide. The photodiode is optically coupled to the film wave guide by a leakage coupling. A wavelength selection element in the form of a grating is provided in the surface of the film wave guide. The module can be manufactured with a single epitaxial step. Structures for increasing the crosstalk attenuation of the module and for a better coupling-in of radiation into the module are provided.

Monolithically integrated WDM demultiplex module and method of

A wavelength-division multiplex component for an optical broadband ISDN network with monomode transmission fibers is an uncomplicated component for bi-directional optical wavelength-divison multiplex transmission composed of a rod lens, a wavelength selective filter planarly applied to a front surface of the rod lens, and a plug member surrounding the rod lens and the filter. Monomode and multimode light waveguides are held in the plug member and are butt-coupled to a back surface of the rod lens. The monomode light waveguide fiber is preferably aligned to the optical axis of the rod lens and the front end face of the rod lens is preferably inclined slightly relative to the optical axis so that the multimode light waveguide, which extends parallel to the monomode light waveguide, can be offset laterally therefrom.

Wave-division multiplex component for an optical network comprising

An optical waveguide junction which can be used as a wavelength demultiplexer, having two aligned fibers separated from each other by a wavelength-selective filter and a fiber branching off laterally from these fibers at the level of the filter. At the same time, a greater degree of coupling efficiency, applicability in monomode fiber lines, and greater adjusting tolerances in production of the junction are achieved. It is recommended that each of the two aligned fibers have different core diameters, while the fiber feeding the filter has a smaller core diameter than the fiber continuing from the filter. In one embodiment of the invention the feed fiber includes a monomode fiber and the continuing fiber of a multimode. The junction can be used as a demultiplexer for optical-fiber transmission lines for unidirectional operation for demultiplexing.

Optical waveguide junction and method of making said junction

A method for integrating a DFB laser and a passive strip waveguide on a substrate. A layer stack is produced in a first epitaxy step, the layer stack having a laser-active layer and a surface-wide grating on the uppermost layer, and eroding the stack area-wise, but only down to a layer under the laser-active layer, not down to the substrate, by means of etching to create a step separating the laser region from the passive strip waveguide region. By employing an etching stop layer, the etching can ensue self-adjustingly, and the coupling between the laser-active layer and the passive strip waveguide region occurs not by end coupling, but by surface coupling. Only two epitaxy steps are required for the complete manufacture of the structure, and a strip required for the definition of the laser and of the waveguide can be produced in the same single method step.

Method for manufacturing of integrated DFB laser with coupled strip

A branch connector for light waveguides which utilizes a beam divider mirror characterized by a carrier member aligning a pair of light waveguides on a common axis, a beam divider which is arranged on a plane slanted to the common axis on an angle which is larger than 45 degrees and is positioned between the ends of the waveguides and flush therewith and a second carrier plate mounting an additional waveguide adjacent one of the pair of aligned waveguides on a second axis extending at an angle to the common axis and intersecting the common axis at the beam divider mirror with the second axis being oriented to receive light reflected along the given direction.

Branch connector for light waveguides

A multiple branching means for distributing light from light wave guides for a plurality of horizontally extending light wave guide channels and a plurality of transversely extending light wave channels coupled to said horizontally extending channels and wherein a mirror layer is formed on an angle .phi..gtoreq.45.degree. at the junction point between the horizontal and vertically extending channels with light wave guides mounted in the channels and wherein the mirror layer is designed as an edge variable filter so that the wavelength of the filter is varied from one filter end perpendicular to the light wave guides in the guiding channels as a function of the distance X from said one end.

Multiple branching light wave guide element

A star coupler for an optical data bus system in a star configuration or other local networks comprises a passive optical star coupler in the form of a transit mixer which distributes the optical signals, transmitted by subscriber transmitters and supplied to the passive optical star coupler by incoming optical waveguides and output via outgoing optical waveguides. The star coupler exhibits an additional optical transmitter whose optical signals are likewise capable of being input coupled in the passive optical star coupler, as well as a listening device for listening to the optical signals supplied to the passive optical star coupler in the incoming optical waveguides. The listening device emits signals which are related to the detected signals. Embodiments of a star coupler with a passive optical reflection star coupler are also described.

Star coupler for local networks of optical communications system

An optical branching unit and method for producing the unit which comprises an optical branching element having a body portion with at least one surface having the waveguides extending thereto, said surface and the waveguides being polished optically flat to extend perpendicular to the longitudinal axis of the waveguides, each of the units being secured in a housing, which has a port associated with each optical waveguide and a device for receiving and holding an external waveguide being axially aligned with the axis of each optical waveguide so that an external waveguide can be held in an abutting and aligned contact with the polished optical waveguide of the polished optical flat surface to form an optical waveguide communication with the waveguide of the branch element.

Optical waveguide branching unit and method of making same

A transmission and reception device for a fiber-optical sensor system functioning with two wavelengths is disclosed wherein light of a first wavelength and light of a second wavelength are supplied over in-coupling fibers of a fiber-optical brancher to a fiber path of the sensor system and wherein light returning over the fiber path is supplied over an out-coupling fiber of the brancher to an evaluation means. The brancher is designed such that the greatest part of the returning light is coupled out over the out-coupling fiber. Two advantageous embodiments of such a brancher are disclosed, the one being designed in the form of a non-frequency-selective, asymmetrical quad-gate brancher and the other being designed in the form of a frequency-selective, five-gate brancher.

Transmission and reception device for a fiber-optical sensor system

A coupling element is composed of a thick core fiber having an end formed by a first and second end surface with the first end surface extending substantially perpendicular to the axis of the fiber and the second end surface, which has a highly reflective mirror layer being inclined to the first end surface and to the axis. A second fiber, which is thinner than the first fiber, is coupled by a butt-joint to the first end surface and a third fiber which is also a thick core fiber branches off obliquely from the side of the first fiber adjacent the end.

Coupling element for coupling light into and out of an optical fiber

An optical device such as a branch element comprising a body having at least one port with each port being formed by an integral cylindrical guide plug extend from an outer surface of the body and coaxially receiving an optical waveguide such as a fiber with the end surface of the waveguide and the plug being coplanar. The optical device is made by assembling a plurality of parts having planar surfaces with the planar surfaces engaged with each other and with the parts having semi-cylindrical projections having a flat surface lying in the plane of the planar surfaces to aid in aligning the projections to form the guide plugs, the planar surfaces are provided with coacting adjustment portions comprising recesses receiving projections or posts.

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Munich, Germany

Gerhard Winzer