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| Number | Title | Issue Date |
| 7720335 | Hybrid planar lightwave circuit with reflective gratings The present invention relates to a hybrid planar lightwave circuit in which a silicon reflective diffraction grating etched with a highly accurate deep reactive ion etching process is mounted in a trench formed in a high optical performance silica on silicon wavegui... | 05/18/2010 |
| 7474824 | Planar lightwave filter with mixed diffraction elements A planar lightwave circuit including a slab waveguide, with a plurality of different diffraction filtering elements optically coupling a plurality of input and output ports, provides various optical functionalities including multiplexing, demultiplexing, diplexer an... | 01/06/2009 |
| 7447439 | Optical duplexer and optical triplexer An optical triplexer design is described in which external optical signals at a first wavelength range propagate through a laser source. The laser source provides optical signals having a second wavelength range. The triplexer features a photodetector for providing ... | 11/04/2008 |
| 7376305 | Echelle gratings with low Polarization Dependent Loss (PDL) using metal coating on the reflecting facets only An Echelle grating has alternate first (1a) and second (1b) sets of facets (1). The first set of facets (1a) is operative to reflect incident light (4) for diffraction and the second set of facets (1b... | 05/20/2008 |
| 7305185 | Device for integrating demultiplexing and optical channel monitoring A method for integrating power monitoring capabilities with passive demultiplexing operations, utilizing the high-order diffraction from an optical diffraction grating. The technique helps avoid insertion loss and polarization dependent loss penalties, and device si... | 12/04/2007 |
| 7304797 | Inputs and outputs for an optical multiplexer/demultiplexer utilizing the grating facet diffraction envelope The invention relates to a planar waveguide reflective diffraction grating for use in an optical device, such as a wavelength division multiplexer, providing an increased bandwidth over conventional planar waveguide reflection diffraction gratings while eliminating ... | 12/04/2007 |
| 7272276 | Optical performance monitor An optical performance monitor for measuring the performance of optical networks has an echelle grating for demultiplexing an input beam into a plurality of wavelengths that are focused onto an array of divided output waveguides. Each divided output waveguide is pos... | 09/18/2007 |
| 7209612 | Two-stage optical bi-directional transceiver The invention relates to a planar lightwave circuit including a two stage optical filter for use in a bi-directional transceiver. A first stage includes a non-dispersive optical filter, which enables light within in a certain wavelength range, e.g. a signal channel ... | 04/24/2007 |
