A distributed computer system, as for transmitting and receiving executable multimedia applications, includes a source of a continuous data stream repetitively transfering data representing a distributed computing application and a client computer, receiving the data stream, for extracting the distributed computing application representative data from the data stream, and executing the extracted distributed computing application.

Apparatus for transmitting and receiving executable applications as for a multimedia system

A photon therapy unit implement has a flexible head for conforming to a body part to be treated. The head has a thermally conductive backing to remove heat from the treatment area. The operation of the head is monitored by a photon detector to provide a feedback to the diode drive circuit to maintain the output at the required level. Operation of the head is monitored by a microprocessor which performs a diagnostic function and reports on defects. The treatment protocol is generated by a main control unit that formulates a treatment waveform from a set of treatment protocols. The selection of protocols is performed through a graphical user interface (GUI) which allows selection of treatment areas and customization of treatment as well as maintaining patient history and annotations.

Method and apparatus for photon therapy

A monolithic transmitter photonic integrated circuit (TxPIC) chip comprises an array of modulated sources formed on the PIC chip and having different operating wavelengths according to a standardized wavelength grid and providing signal outputs of different wavelengths. Pluralities of wavelength tuning elements are integrated on the chip, one associated with each of the modulated sources. An optical combiner is formed on the PIC chip and the signal outputs of the modulated sources are optically coupled to one or more inputs of the optical combiner and provided as a combined channel signal output from the combiner. The wavelength tuning elements provide for tuning the operating wavelength of the respective modulated sources to be approximate or to be chirped to the standardized wavelength grid. The wavelength tuning elements are temperature changing elements, current and voltage changing elements or bandgap changing elements.

Transmitter photonic integrated circuit (TxPIC) chip architectures and drive systems and wavelength stabilization for TxPICs

A distributed computer system is disclosed which comprises a source of a continuous data stream repetitively including data representing a distributed computing application and a client computer, receiving the data stream, for extracting the distributed computing application representative data from the data stream, and executing the extracted distributed computing application.

Apparatus for transmitting a distributed computing application on a broadcast television system

An optoelectronic device that has a network address (e.g., IP address) and participates in in-band traffic for purposes of performing functions (e.g., network diagnostics, network control, network provisioning, fault isolation, etc.) that are traditionally performed by host equipment. An embodiment of the invention may have a protocol engine and a status monitoring module. The protocol engine identifies data packets that are addressed to the optoelectronic device, and allows the optoelectronic device to insert packets of information generated by the device into in-band data. Logic of the optoelectronic device may modify the operating parameters of the device according to the control information included in the data packets. The status monitoring module detects the device's physical conditions and the conditions of its links. Status information generated by the status monitoring module may be incorporated into in-band data by the protocol engine such that the status information may be communicated to a host device or a remote device.

Optoelectronic device capable of participating in in-band traffic

A device for the control of the output power of laser diodes designed to be coupled to an optical fiber for the tranmission of data comprises a photodiode that can be used to acquire a characteristic signal of the power emitted by the laser diode; digital means to drive the laser diode comprising a central processing unit associated with servo-control computation program memorizing means to keep a constant output power whatever may be the drift and change of slope of the characteristic of the laser diode in response to ageing phenomena or to a change in temperature or to a loss of power due to the coupling of this diode with an optical fiber or to variations in the response of the photodiode as a function of the temperature. Application to digital transmission by optical fiber.

Device and method to control the output power of laser diodes

The invention relates to a device for controlling the output power of diode lasers intended to be coupled to an optical fibre, for the transmission of data. The device includes a photodiode (202) making it possible to acquire a signal characteristic of the power emitted by the diode laser; digital means (100) for driving the diode laser, including a central processing unit (153) associated with means for storing a feedback calculation programme, for maintaining a constant output power, whatever the drift and the changing slope of the characteristic of the diode laser in response to ageing or to a change in temperature or to a loss in power due to the coupling of this diode to an optical fibre or to the variations in response of the photodiode as a function of temperature. Application to digital transmissions by optical fibres.

Control unit for stabilising the ouput power of laser diodes

L'invention concerne un dispositif de controle de la puissance de sortie des diodes laser destinees a etre couplees a une fibre optique, pour la transmission de donnees. Le dispositif comporte une photodiode (202) permettant d'acquerir un signal caracteristique de la puissance emise par la diode laser; des moyens numeriques (100) de pilotage de la diode laser comportant une unite centrale de traitement (153) associee a des moyens de memorisation de programme de calcul d'asservissement, pour maintenir une puissance de sortie constante, quels que soient la derive et le changement de pente de la caracteristique de la diode laser en reponse au vieillissement ou a un changement de temperature ou a une perte de puissance due au couplage de cette diode a une fibre optique ou aux variations de la reponse de la photodiode en fonction de la temperature. Application aux transmissions numeriques par fibres optiques.

Jean-Francois Queniat

Papers

Device and method to control the output power of laser diodes

Control unit for stabilising the ouput power of laser diodes

Dispositif de contrÔle de la puissance de sortie des diodes laser