Intune Technologies Limited

Intune Networks Limited

The Provost Fellows and Scholars of the College of the Holy and Undivided Trinity of Queen Elizabeth, Near Dublin

David McDonald

Thomas Farrell

Tommy Mullane

James Christopher O'Gorman

Pascal Landais

Tom Farrell

Paul McEvoy

Frederick Paul Logue

Giuseppe Tali

John Courtney

Ciaran Polley

Michael Todd

Peter B O'Connor

David Bernard

Ronan Diffily

Emilio Bravi

Jim Shields

Thomas Mullane

The invention relates to a system and method of dispersion measurement in an optical fiber network. The invention provides means for transmitting from a transmitting node, using a single tunable laser transmitter, two consecutive bursts of data at different wavelengths &#x3bb;and &#x3bb;to a receiver node, wherein each burst of data comprises a unique sequence of amplitude modulated data, and wherein the two sequences are injected with a fixed known delay. The delay between the two consecutive bursts of data is maintained by selective switching of the tunable laser, such that clock recovery circuitry at the receiver node remains locked during the delay between the two bursts. The dispersion measurements method of the present invention is based on walk off and bit position detection between two wavelengths suitable for fast optical burst switching network is described. This method does not require an operator, extra equipment, or traffic interruption on the network.

Dispersion measurement system and method in an optical communication network

The invention provides an optical burst switch in an Optical Burst Switched (OBS) communication network, said optical burst switch comprising means for monitoring and maintaining mesh of virtual optical paths from a communication node to a plurality of other communication nodes, arranged in a ring network, enabling traffic data to be transmitted and/or received between nodes via a physical optical path. The switch also provides means for sending a data packet probe on a virtual path from a node to each other node in the OBS communication network, wherein data packet probe information received at said switch provides information of availability of the physical optical path for sending traffic data between nodes. The switch can be configured such that the rate at which this path monitoring is scheduled guaranteeing less than 50 ms protection switch in the event of monitoring a failed or degraded path.

Switch system and method for the monitoring of virtual optical paths in an optical burst switched (OBS) communication network

The invention relates to a method and system for providing a set of continuous tuning regions from a discontinuously tuned laser, by providing a wavelength reference having at least first and second resonance peaks, sweeping the laser across a pre-determined wavelength range of the wavelength reference, and defining, within the laser sweep, one or more regions of continuous tuning operation of the laser, each of the regions corresponding to a response of the laser between adjacent resonance peaks of the wavelength reference. The advantage of the invention is that it provides a way for stitching together continuous regions of a multi-section tunable laser in an efficient and accurate manner.

Method and system for continuous sweeping of a tunable laser

A system in which the controller () of a multi section diode laser such as a SG-DBR () is configured so that the laser can be swept rapidly in a pre-determined frequency direction through a series of frequency points by asserting a pre-calibrated series of sets of control input values to the sections of the diode laser, wherein the frequency points are obtained from cavity modes in a plurality of different supermodes, and the sets of control input values are pre-determined to take account of thermal transients that are known to arise from jumps in the output modes that occur when sweeping through the pre-calibrated series of sets of control input values in the pre-determined frequency direction.

Frequency setting of a multisection laser diode taking into account thermal effects

The invention provides a method to compensate for degradation in a tunable laser and ensure its performance by tracking the degradation and adjusting the control information accordingly. This is accomplished by performing some measurements of the output of the tunable laser at an initial setup or calibration procedure. Then, by effecting a periodic repetition of these measurements and using a comparison between these two measurements the present invention provides for a compensation factor for the operating conditions, primarily in the form of a look up table of operating points of the laser. These measurements show how much the operating points of the laser have drifted over the period since the last set of measurements, which provide control informatIon to compensate for degradation in the laser.

Method for compensation of degradation in tunable lasers

A laser diode () having an optical path () defined in an active layer () which is sandwiched between a substrate layer () and a top layer () and defined by a ridge () formed in the top layer () outputs laser light of a single predetermined wavelength. Refractive index altering grooves () extending transversely in the top layer () are provided at spaced apart locations for altering the refractive index of the active layer () along the optical path at partial reflecting locations () for causing partial longitudinal reflections of the laser light generated in the optical path () so that standing waves or harmonics thereof of the single predetermined wavelength are set up between the respective partial reflecting locations () and a first mirror facet () in the optical path (). In order that the standing waves set up between the partial reflecting locations () and the first mirror facet () are harmonics of the predetermined single wavelength, the refractive index altering grooves () are located along the ridge () for forming the reflecting locations () at distances from the first mirror facet () which correspond to the effective length of the optical path () resulting from the affect of the inclusion of the reflecting locations () rather than at locations corresponding to the actual length of the light path ().

Optical waveguide and a method for providing an optical waveguide

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Dublin, Ireland

David McDonald