Metrophotonics Inc.

National Research Council of Canada

Everest Networks, Inc.

Freedom 25 Investments Inc.

Michael Davies

Jian-Jun He

Emil S Koteles

Orazio Berolo

Bryant P Hichwa

Jerzy A Dobrowolski

Gordon Freedman

Arbinder Singh Pabla

Philip J Poole

Rejean Munger

Jean-Paul Noel

Sylvain Charbonneau

Geofrey C Aers

Derek Houghton

Disclosed are embodiments of a wireless access device for use in a wireless backhaul network. In an embodiment, a wireless access device for accessing a wireless network comprises: a first antenna module including a plurality of traveling wave antennas, wherein at least one of the traveling wave antennas has at least two ports; and an interface circuit coupled to the first antenna array, the interface circuit configurable to interconnect one or more radios to the one or more traveling wave antennas, including selectively interconnecting a radio frequency (RF) signal from a radio to a first port of at least one traveling wave antenna to generate a first beam for a first non-line-of-sight (NLOS) link of a wireless backhaul network, and selectively interconnecting a same or different RF signal from the same or another radio to a second port of the traveling wave antenna to generate a second beam for a second NLOS link of the wireless backhaul network, wherein the first and second beams have different radiation patterns or polarization.

Wireless backhaul network using traveling wave antennas

A method and system for providing multiple ophthalmic and retinal blood measurements is outlined. By extracting multiple digitized wavelength images and quantitative data within a relatively short time period the method allows for compensation of a patient's eye or head movement, generation of ophthalmic clinical records, and determination of data relating to blood measurements, such as oxygen saturation and hemoglobin, in addition to ocular and other disease determinations. The method provides for multiple analysis and measurements within a single sitting of the patient, with a single simple instrument and without adaptations to the instrument during a patient's eye examination. Beneficially the approach allows for low cost, compact, and even portable implementations offering such analysis and determination outside the current ophthalmic centers providing eased access and earlier diagnosis opportunities.

Method and apparatus for correlated ophthalmic measurements

A dynamic gain equalizer using amplification instead of attenuation is disclosed. The device relies on integrated semiconductor optical amplifiers in line with a demultiplexer on a single integrated substrate for performing equalization of signals within each of a plurality of channels.

Optical dynamic gain amplifier

A bidirectional multiplexer and demultiplexer based on a single waveguide grating is presented. In one embodiment of the invention, the device contains a multi/demultiplexer having an echelle grating disposed between a plurality of input channels and a plurality of output channel arrays. The input and output channels are assigned in a particular order, such that the multiplex and demultiplex functions have the same wavelength channels and such that the blaze angle of the grating facets are optimized simultaneously for both the multiplex and demultiplex function. Because the optical signals are multiplexed and demultiplexed by the same dispersive element, problems of mismatching performance introduced by using different optical components are obviated. The input/output waveguides of the dual-function device can be coupled to a single fiber array, thus reducing the packaging cost.

Bidirectional multiplexer and demultiplexer based on a single echelle waveguide grating

An optical echelle grating for use with a switching fabric to provide different wavelength switching assemblies such as an optical cross connect. The single grating receives a plurality of multiplexed input optical signals and provides optical signals corresponding to the individual wavelength channels to a switching fabric. The switching fabric routes the signals corresponding to the wavelength channels appropriately and the signals then propagate to the grating once more and are wavelength multiplexed.

Optical cross connect device with single grating

In accordance with the present invention a multifrequency Raman pump laser cavity is disclosed comprising of an angularly dispersive element optically coupled to a shared waveguide terminated in a partially reflecting facet; a plurality of laser diode sources for radiating at frequencies for Raman amplification each for providing laser light at a different frequency and spatially oriented in relation to the angular dispersive element such that light emitted from each source is reflected from the angularly dispersive element toward a same output port; at least two partially reflecting coating for forming a laser cavity therebetween wherein the grating is within the laser cavity or defines a boundary thereto.

Multi-frequency Raman amplifier pump source

A homogeneous semiconductor waveguide structure having an undoped core layer and doped cladding layers on both sides of the core layer is proposed wherein the waveguide core is substantially thick providing polarization independence. Because of the cladding layers having low refractive index contrast with respect to the core and being on opposing sides resulting in a substantially symmetrical structure, the waveguide, can be made single-mode with low polarization sensitivity, thus improving characteristics for conducting light therein. Furthermore, the enlarged mode size increases coupling efficiency. Also, since the waveguide is grown from a single semiconductor composition lattice matched to the substrate, wafer uniformity and reproducibility are enhanced. The three layer structure reduces birefringence sufficiently that a yield enhancing etch stop layer can be added to the structure without substantially adverse effects.

Polarization independent waveguide structure

Bandgap tuning of semiconductor well structure

An optical wavelength selective device is provided that is particularly useful as a demultiplexer. The device is made from a planar slab optical waveguide material transmissive to light. Perturbations in the form of holes are etched into the slab waveguide cladding or preferably into the core of the waveguide thereby changing the effective refractive index of regions within the core. The holes are very closely spaced and form a transmissive optical grating, having dimensions suitable for operating in the Raman-Nath regime. Mirrors or lenses are formed within the device for guiding an input beam into the waveguide as a parallel light source.

Raman-nath diffraction grating

An authenticating system for verifying articles is provided. The articles to be verified have a thin film multilayer coating applied to them that serves or functions as a type of finger print. In a reflective mode of operation the coating is designed to reflect light radiation of predetermined wavelengths and substantially absorbing or transmitting light radiation of other predetermined wavelengths irradiating a same location on the coating surface; in operation a light source is provided for irradiating light onto said location on the coating surface; and a detector is used to determine the presence and absence within predetermined limits of each of said predetermined wavelengths of light at said location that are substantially reflected by the coating. The system may also be configured in a transmissive mode or an absorptive mode of operation when used with the compatible detection schemes as exemplified herein.

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Ottawa, Canada

Michael Davies