Abstract: An optical phase modulator includes an input source that is configured to receive a light source. There is an output operative to provide a phase modulated output signal based on the received light source. There is a first optical coupler configured to split the light source into a first optical path of a Mach Zehnder Interferometer (MZI) and a second optical path of the MZI. A static phase shifter is configured to provide a static phase shift to the first optical path. There is a phase modulator in the second optical path. There is a second optical coupler configured to combine the first optical path and the second optical path. The first and second optical couplers are tuned such that the phase modulated optical signal at the output provides a substantially constant amplitude that is independent of a change in loss introduced by the phase modulator.

Abstract: The device includes a first detector configured to detect, from received signal power, first fault parameters related to an occurrence of a first fault on this optical fiber. The device further includes a database configured to store the first fault parameters and a second detector configured to detect from the received signal power second fault parameters related to a restoration of a second fault on the optical fiber. The device further includes a comparator configured to compare the second fault parameters with the stored fault parameters and to decide that the fault is resolved if the first fault parameters most closely match the second fault parameters.

Abstract: A method and system of optical communication are provided. An optical modulator device includes a first and a second waveguide segment, and is configured to modulate an incident optical signal. A first feed-forward equalization (FFE) circuit including an inner first tap and an inner second tap, is configured to equalize the first waveguide segment. A second FFE circuit including a first inner tap and a second inner tap, is configured to equalize the second waveguide segment. An FFE recombination of the first inner tap and the second inner tap of the first and second FFE circuits, is in the electrical domain, respectively. An FFE recombination of the first and second modulation signals, operative to equalize a combination of the first second waveguide segments, is in the optical domain.

Abstract: A device and method of optical equalization using an optical modulator is provided. An electrical modulation signal is split into a first modulation signal and a second modulation signal. The second modulation signal is delayed relative to the first modulation signal. An amplitude of the second modulation signal is attenuated relative to the first modulation signal. The first modulation signal is applied to a first waveguide segment of the optical modulator. The second modulation signal that is delayed and attenuated relative to the first modulation signal is applied to a second waveguide segment of the optical modulator. Both the applied first and second modulation signals generate a feed-forward equalized optical signal that is recombined in the optical domain.

Abstract: The present invention relates to an assembly (10) for attaching a data storage device (12) to an on-board computer including an encapsulation structure (17), and a receiving structure (18) for receiving the encapsulation structure (17) comprising a first connector complementary to a connector of the storage device and a second connector complementary to a connector of the onboard computer. The encapsulation structure (17) and the storage device (12) mounted therein are movable relative to the receiving structure (18) between an inserted configuration in which the encapsulation structure (17) and the storage device (12) are inserted into the receiving structure (18) and the connector of the storage device (12) is connected to the first connector, and a removed configuration in which the encapsulation structure (17) and the storage device (12) are removed from the receiving structure (18).

Abstract: Methods and systems for bias control in an optical switch fabric include monitoring optical power at outputs of a plurality of switch elements in an N×N switch fabric that has N inputs, N outputs, and M?2 stages. A bias control of a first of the plurality of switch elements is adjusted. It is determined whether the optical power at the outputs of the first switch element after bias control adjustment conform more closely to a predetermined criterion relative to the monitored optical power at the outputs of the first switch element prior to adjustment. The adjusting and determining steps are repeated for each of the remainder of the plurality of switch elements.

Abstract: A photonic waveguide structure for performing polarization rotation includes a first waveguide layer including input and output waveguides. The input and output waveguides are separate and discontinuous structures. The input and output waveguides are configured in the first waveguide layer to have a lateral offset therebetween. The photonic waveguide structure further includes a second waveguide layer including a waveguide structure disposed under or over the first waveguide layer. The waveguide structure includes a polarization conversion region configured within the second waveguide layer to overlap the input or output waveguides in the first waveguide layer.

Abstract: Optical switches and methods of switching include a first hybrid coupler configured to accept an input and to provide two branches. A phase tuner on a first branch includes a Mach-Zehnder phase shifter configured to shift a signal on the first branch by a selected phase. A loss compensator on a second branch is configured to match a loss incurred on the first branch. A second hybrid coupler is configured to recombine the two branches such that the phase shift generated by the phase tuner determines which output of the second hybrid coupler is used.

Abstract: Methods and systems for bias control in an optical switch fabric include monitoring optical power at outputs of a plurality of switch elements in an N×N switch fabric that has N inputs, N outputs, and M?2 stages. A bias control of a first of the plurality of switch elements is adjusted. It is determined whether the optical power at the outputs of the first switch element after bias control adjustment conform more closely to a predetermined criterion relative to the monitored optical power at the outputs of the first switch element prior to adjustment. The adjusting and determining steps are repeated for each of the remainder of the plurality of switch elements.

Abstract: A process for calibrating a first loop feature value estimation method using a first locally measurable loop characteristic and a first set of parameters, includes taking measurements of the first locally measurable loop characteristic for a plurality of loops, and obtaining a reference data set representing reference estimates of the loop feature value. The reference estimates are obtained by performing a calibrated second loop feature value estimation method using a second locally measurable loop characteristic and a second set of parameters. The method further includes determining calibrated parameters so as to minimize a deviation between the reference estimates and estimates obtained by applying the first estimation method to the measurements using the calibrated parameters as the first set of parameters.

Abstract: A method for automatically generating a limited set of spectrum and service profiles for use in an operator's telecommunication network includes collecting physical layer parameter values for individual lines, determining a set of optimized parameter values for each one of the individual lines, estimating a probability density function for each optimized parameter based on optimized parameter values for multiples lines, sampling the probability density function for each optimized parameter and selecting and combining according to parameter and profile policies a set of optimized parameter values to generate the limited set of spectrum and service profiles.

Abstract: Method for testing an analog front end coupled to a telecommunication line of a telecommunication system and a related testing system is described. The testing system comprises a single ended line testing measurement module for applying single ended line testing measurements via said analog front-end upon said line and for collecting thereby single ended line testing measurements; and a processing means for interpreting the single ended line testing measurements and for thereby judging that the analog front end being out of order and a control means for controlling the single ended line testing measurement module and processing means.

Abstract: An optical device comprising a tunable optical frequency comb generator. The comb generator includes an interferometer, and an optical feed-back loop waveguide.

Abstract: A method and a device for clustering lines of a wireline network in a number of virtual binders includes obtaining a noise value samples pertaining to different lines of the wireline network at substantially coinciding sampling moments, detecting corresponding features in these series, determining degrees of correlation between these features, and assigning the lines to one or more virtual binders on the basis of their mutual degrees of correlation.

Abstract: An optical device comprising a tunable optical frequency comb generator. The comb generator includes an interferometer, and an optical feed-back loop waveguide.

Abstract: An optical device comprising a tunable optical frequency comb generator. The comb generator includes an interferometer, and an optical feed-back loop waveguide.

Abstract: A photonic integrated circuit (PIC) having a waveguide-grating coupler with two evanescently coupled waveguides. The first waveguide is fabricated using materials suitable for manufacturing active optical elements in the PIC. The second waveguide is fabricated using materials capable of providing a relatively high index-of-refraction contrast for the constituent waveguide grating. The waveguide-grating coupler is compatible with the III-V semiconductor technology while being relatively easy to fabricate on an industrial scale.

Abstract: A fault detection method includes collecting operational parameters of the optical network, collecting information about the structure of the optical network, providing diagnosis outputs by a diagnosis engine analyzing the structure information and the operational parameters, and deriving optical network faults from the diagnosis outputs. The collected operational parameters and the collected structure information may be stored in a database. The operational parameters are related to equipment, Quality-of-Service and/or architecture of the optical network. The optical network faults derived from the diagnosis outputs may concern equipment issues, interoperability problems and/or physical defects. The diagnosis engine generates the diagnosis outputs by using decision trees, Bayesian network techniques and/or multivariate classification techniques.

Abstract: A method for automatically generating a limited set of spectrum and service profiles for use in an operator's telecommunication network includes collecting physical layer parameter values for individual lines, determining a set of optimized parameter values for each one of the individual lines, estimating a probability density function for each optimized parameter based on optimized parameter values for multiples lines, sampling the probability density function for each optimized parameter and selecting and combining according to parameter and profile policies a set of optimized parameter values to generate the limited set of spectrum and service profiles.

Abstract: A photonic integrated circuit (PIC) having a waveguide-grating coupler with two evanescently coupled waveguides. The first waveguide is fabricated using materials suitable for manufacturing active optical elements in the PIC. The second waveguide is fabricated using materials capable of providing a relatively high index-of-refraction contrast for the constituent waveguide grating. The waveguide-grating coupler is compatible with the III-V semiconductor technology while being relatively easy to fabricate on an industrial scale.